Change search
Refine search result
12 1 - 50 of 70
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    Alagic, Almira
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Balint, Norbert
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Marknadsanpassning av kabelskopa2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Excavating buckets are tools that construction machines use for excavation, demolition or moving different sorts of soils. Buckets are exposed to harsh environments there for ex-ample weather and the soil material that wears and strains the tool. To minimize wear and increase the tool's efficiency, can the material for the bucket be suited for the environment in which the tool is used.

    The aim of the project is to help the company to increase their exports to the EU. The goal is to produce a cable bucket adapted for the Dutch market, which is based on the product's current weight, material composition, performance and cost.

    Based on the company's needs the focus of this project is to adapt a cable bucket to the conditions and the market in the Netherlands. In order to implement a market expansion the company also needs to get information about market conditions, circumstances and customer requirements.

    In the end of the project a cable bucket considered to be adapted for the Dutch market were proposed. The comparison between the new bucket and the existing bucket resulted in a lighter and cheaper bucket where the material choices are based on the most common in the Netherlands and the bucket performs as its competitors.

  • 2.
    Alfredsson, Jonas
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Framtagning av kravspecifikation och affärsmodell för fjärrdiagnostisering av lyftlösning2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In collaboration with Binar Quick-Lift Systems AB, a product development project has been carried out at the University West in Trollhättan. Binar Quick-Lift Systems AB manufactures and develops lifting solutions for loads up to 300 kg and is an affiliate of the Binary Group, where operations are conducted in two primary areas: Industrial Solutions and First Responder Technology.

    The vision for most companies is to develop and given the current trend of the Internet of Things, Binar wanted to see how a wireless communication solution can integrate with the company's existing lifting solutions. The goal of this mission was to establish a requirement specification and a business model for wireless diagnostics of their lifting solution, based on customer needs and the company's basic requirements.

    The introduction of the project consisted of a preliminary study which included information gathering and interviews with stakeholders and experts. A market investigation was performed in parallel with the interviews where a function and competitor analysis were conducted to obtain relevant customer data as well as an understanding of the market. The requirement specification was established using collected information in the preliminary study and the business model was generated from the preliminary study as well as the customer and base requirements.

    The result was a requirement specification with mainly subjective requirements as well as a business model with a basic contract offer for the sale of the wireless solution.

  • 3.
    Alléus, Jonas
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Dalin, Patrik
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Vass, Sebastian
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Planering av laddstationer vid flerbostadshus2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Sales of electric vehicles grow annually which increases the need for charging stations on parking lots at apartment houses. This report explore both the technical and the economical aspects of electric car charging for Stenungsundshem. The types of electric cars available on the market that can be charged by energy from the electric power network is the Plug-in hybrid and the electric car. The most common type on the market is the Plug-in hybrid which is driven by an electric motor and an internal combustion engine. The electric car is only driven by an electric motor. Charging times for electric cars depend on if the charging station is designed with normal charging or fast charging. For home charging, normal charging is the most common type of charging where the car is fully charged after six to ten hours. The connection between charging stations and cars can be made by different types of connectors. The European standard is the Type 2 connector. Safety is very important when charging electric cars, Therefore, charging stations have been divided into four different safety modes. Safety modes differ depending on the type of communication available between the charging station and the car. Mode 3 is the standardized mode in the Nordic countries. Charging of electric cars can result in power peaks which the main fuse must be dimensioned for. Power peaks can be reduced by using some type of load balancing system where available power during the day is distributed between charging stations to keep the power consumption below rated power. Terms of how charging is done and installation of charging station must be in compliance with Ellagen. For easier compliance and clarification of Ellagen standards and regulations should be used. In this project cable dimensioning by power requirements for different amounts of charging stations has been made, PEX insulated aluminum cable is exclusively used within the project. The market of charging stations is explored to look at different solutions and costs for charging stations and routing of cables. The best option for Stenungsundshem is currently to install two charging station for charging outlets to four parking spaces. Contributions like “Klimatklivet” can reduce total costs of investments for charging stations and cable routing with up to 50%.

  • 4.
    Andersson, Anette
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Bojort, Daniel
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Nätplan för fördelningsstation M5 Hålta2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In the area of Tjuvkil on the west coast, about 16 kilometers west of Kungälv city, a new residential area is about to be planned for about 140 new houses and holiday houses turned into permanent houses. A grid plan will therefore be made to investigate if there are any flaws to consider for the 10 kV-net, before and after the introduction which the new load will cause on behalf of the houses, plus extra space for the installation of an amount of charging posts.

    The purpose of this thesis is to compile the grid plan which will make the groundwork for the power distribution grid under the M5 transformer Hålta, which contains the areas for the new settlement. Backed up by the software dpPower this work will point out the flaws such as thin cables where large load currents and voltage drop occur, and also the statistics for interruption for the five outgoing lines from M5. This work also shows the status for the transformer in Hålta and how the surrounding grids status will be affected during their backup of emergency power for the M5. This work shows the grid status in the 4 steps as present status, with new load, emergency power and solutions.

    The thesis's evaluation of M5 Hålta will result in a suggested change of cable for the line L501 to Tjuvkil, which will decrease voltage drop and lower load current to avoid interruptions on the grid. Emergency power is lacking for a large-scale consumer and can be fixed with a looped feeding instead of a single line feeding on line L503. The transformer M5 in Hålta is already heavy loaded and in need to be replaced by a larger transformer later on. The thesis gives a suggestion on how to connect the adjacent transformers M1, M4 and M6 for emergency power.

  • 5.
    Andersson, Markus
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Jonsson, Fredrik
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Säkerhetsanalys av interna IT-säkerheten på ett mellanstort företag2018Independent thesis Basic level (professional degree), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    This thesis is about a security analysis of a company's use of IT and their internal network security. The company is a midsized with about 100 employees and half of them use IT in their daily work. The company is active within industrial manufacturing and is located in western Swe-den. They want to develop in IT and are curious about how secure their network is today.

    A review of the layer 2 network security and computers used in the daily work was performed and evaluated. Anonymous interview of employees were made to find out how IT is used at work. A risk analysis was filled in by the responsible employees at the company to get an overview of how they think about risks and vulnerabilities in the use of IT. All this was done to bring recommendations to the company about how they can improve their security compared to what it is today.

    The results from the analysis of the network indicates weaknesses in the layer 2 security and that no security features are currently used to stop attacks from the inside of the net-work. The company has no high demands on the network or the security on the in-side but has given priority to flexibility and physical security.

  • 6.
    Augustsson,, Jimmy
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Printz, Kristoffer
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Svensson, Erik
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Larmanalys för Vattenfall Vattenkrafts produktionsanläggningar längs Göta Älv2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Vattenfall Vattenkraft AB owns 57 large scale hydro power plants in Sweden with installed power exceeding 10 MW. The study relates to four of the plants located along Göta river. This report analyzes incidents and the related remedial actions that have occurred during the period 2014 – 2017 as well as the alarm and control systems with the aim to identify potential improvements. The incidents are categorized by error, what actions have been undertaken to correct the issue, plant and season. The incidents have predominately originated in the turbine and generator facilities and have been caused by abnormal levels or temperatures. During summer and winter time, this is mainly due to variation in temperature and flow in the river. The four plants have caused a similar amount of alarms, which is interesting as there is a large variation in age. The analysis does not identify any reoccurring issues which were previously unknown to the company, but the authors recommends that an investigation is conducted to assess if eel screens should be installed for the cooling pumps of Lilla Edet. The alarms are generated in the plants and are sent to the control facility in Bispgården near Sundsvall, where the operator calls the local engineer on duty in Trollhättan. The engineer subsequently goes to the plant to access detailed information on the incidents from the local computers. This report examines the possibility to provide the engineer on duty with detailed information from the plant computer via VPN. This would be possible to implement but would require a detailed assessment of the security implications. The status of the alarm system have also been assessed as it have been modified and extended retroactively, and there is currently no comprehensive overview. The conclusion is that a review of the list of incident codes and their priority is recommended.

  • 7.
    Augustsson, Per
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Mansori, Farsad
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Skapande av dynamiskt modellnät för analys av lasters beteenden vid nätstörningar2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor’s thesis is carried out on behalf of Vattenfall Eldistribution AB in Trollhättan. This work aims to make modelling of power grids for simulations, of load behaviour during perturbations, in PSS/E more effective. Modelling will be made more effective by means of programming, using the programming language Python, and also by allowing certain assumptions to be made about the grid. The idea for this work arose from a certain case, during which Vattenfall was tasked with investigating why voltage levels near an industry would not recover after a short circuit, on the transmission line feeding the industry, was cleared. Investigations demanded simulations of the disturbance to be carried out in PSS/E, to describe what had happened. To enable simulation and to make it representative, the grid and its components must be adequately modelled. Svenska kraftnät has the data nessecary for such modelling, but it is inaccessible due to confidentiality. Due to the data being confidential extensive work with modelling was nessecary. Early simulations were based on the idea that some parts of the grid can be modelled using only simplified models, and with typical, or default, values. This thesis uses that hypothesis in the programming code. The low voltage after these perturbations were caused by motors, more specifically induction motors, drawing high currents from the grid during reacceleration when the voltage starts to recover after the perturbation. This high, and mostly reactive, current causes significant voltage drops across the lines and transformers, in turn causing other motors to draw more current and further lowering voltage. The programming code, called a script, developed during this work allows the user to quickly create dynamic model data to use when conducting simulations of the dynamic behaviour of this type of loads. Modelling of the generators is done quickly thanks to the assumption that generators are located far enough away that they are barely affected by the studied disturbance. They are, for this reason, modelled using typical values. Through a graphical interface, the user then select which loads to model. For each load model, the distribution across different types of loads is specified by the user. Finally, protection relays are modelled to enable current monitoring. The script has been tested by comparisons to a reference network model created by Vattenfall. The comparisons show minor deviation between the script and the reference. This could be because the script uses default values and models less components than the reference.

  • 8.
    Axelsson, Daniel
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Olsson, Daniel
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Utvärdering av olika dynamiska lastmodeller i PSS/E2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor’s thesis has been performed for Vattenfall Eldistribution AB. The purpose of this work has been to create understanding of dynamic load models and clarify how they function and how they can be used. The aim has been to perform simulations on short circuits and motor starts for two different load models. A part of the work is also to describe the basic principles of the induction motor to create a connection between simulation and theory. The theory of the induction motor contains information about the electric induction that is the basic principle of the induction machine. It also contains the correlations between torque, speed, current and voltage and also a description of the equivalent electric circuit. The IMD program is a program connected to PSS/E and it has been used to create the model for the induction motor that has been used for the simulations. The simulations have been based on instructions from the advisor and instructions from the PSS/E manuals. Simulations have been run with two of the built-in load models in PSS/E, one general load model and one model for induction motors. Short circuits have been simulated on both models and motor starts on the induction motor model. Short circuits have been simulated with two different fault durations 0.15 and 0.4 seconds. Motor starts have been simulated with two different transformer sizes 1.5 and 3.0 MVA and three different values of the inertia time constant 0.7, 1.0 and 1.5 MWs/MVA. At short circuit the fault duration causes larger currents and longer recovery times for both load models. At motor start the size of the transformer, in MVA, and the inertia time constant affects the motors starting time. Larger transformer means shorter time because of lesser drop in voltage. A larger inertia time constant means longer time.  If only the size of the voltage drop is of interest and not the course of the event, the motors start admittance can be used instead.

  • 9.
    Beissinger Bart, Andres
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Soto Vallejos, Nicolas
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Beredning av kabelnät i området Sjöhaga - Lerdala Gård2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The thesis describes a preparation work for Ellevio AB. The preparation work is supposed to rebuild the power grid in Sjöhaga - Lerdala in Skövde municipality with the aim to weatherproofing the local area network and increase the reliability. The project concerns all work on preparation such as contact with authorities and landowners involved in the project, in order to agree on where the new cables can be built. Field visits were conducted continuously during the project for an overview of the area and to plan possible cable stretches, as well as the best possible location for the network stations in agreement with the landowners. The preparation of the underground cable is carried out in four parts, part one is Sjöhaga - Melldala, part two is Melldala - Karlsfors, part three is Karlsfors - Dämman and part four is Dämman – Lerdala Farm. Part one will have a serial satellite network station with a 200kVA transformer and no local network preparation will take place at this stage. In part two Karlsfors will keep its current local distribution network and network station, part three will have an ELIT3 network station fitted with a 100kVA transformer. For part four, there will be an ELIT3 network station with 100kVA transformer and three cable cabinets. In addition to these parts, the possibility for a redundancy feeding between Karlsfors - Yttersöra was investigated. However, when this was perceived as not possible due to the environmental conditions, it was decided, on the recommendation of a supervisor at PSN Kraftkonsult, to be placed between Dämman - Björnsäter with a overhead cable on existing poles. The cost of the renewal amounts to 2.6 million SEK and 449 thousand SEK for the redundancy from Dämman to Björnsäter. Network stations are positioned in Melldala, Dämman and Lerdala Farm which also has three cable cabinets. The total cable length of the HV-system is 6.5 km and the LV-system is 1.70 km.

  • 10.
    Bengtsson, Victor
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Svantesson, David
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Teknisk och ekonomisk analys av svetsmetoden HF-TIG i Ti-6Al-4V2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    GKN Aerospace Sweden AB belongs to one of the four divisions within GKN and has most of its operations in Trollhättan, where development, manufacturing and maintenance are performed on components for jet engines. GKN is more than 250 years old and has nearly 60 000 employees, of whom approximately 2 200 works in Trollhättan.

    The aim of the thesis was to evaluate the high frequency tungsten inert gas (HF-TIG) welding method technically and economically for potential future implementation in GKN's production. The hope is that the welding method can contribute to a more stable manufacturing process with fewer delays and reduced quality deficiency costs on the product XWB-ICC (Xtra Wide Body – Intermediate Compressor Case), where today conventional TIG welding is applied. The existing welding method creates deviations in the quality of certain weld joints due to high thermal impact, and according to previous studies, HF-TIG should have a lower thermal impact on the material compared to conventional TIG welding. The project group, in consultation with the supervisors at GKN and University West, has delineated the work to titanium plates with 1.5mm thickness which has been welded "bead-on-plate" without filler material during the experiments.

    Literature studies in HF-TIG, design of experiments, investment assessment and quality deficiency costs have combined with welding experiments, data collection, measurement of results and meetings with staff at GKN contributed to good knowledge of HF-TIG technical and economic impact on GKN. This has been evaluated and compiled to be able to report a technical and financial result for a potential future implementation.

    In the study's design of experiment, the tip angle of the electrode, frequency, balance and the relationship between background current and peak current have been selected as factors to be investigated. The result shows that all factors affect the measured welding results in one way or another. This provides an understanding of the welding process and indicates which factors can reduce costs, caused by lack of quality.

    In conclusion, project participants together with GKN supervisors estimated a 25% reduction of quality deficiency costs for five specific welds on XWB-ICC. The result shows that an implementation of HF-TIG is economically profitable for GKN.

  • 11.
    Berggren, Andreas
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Engevik, Hampus
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Utveckling av en båtstol med stötdämpningsegenskaper2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim of this project is to develop a concept for a shock absorbing boat seat for power-driven leisure boats. The concept will be presented in the form of a CAD model and proposals for materials and components. The work is a product development project and is carried out on behalf of Segula Technologies. The company believes that there is a great potential for shock absorption seats in the leisure boat market. In order to reach the wide market, an important requirement is that the shock absorption function is integrated into the seat and not in the pedestal. This is because the seat will be able to mount on existing pedestals and still fulfill its function.

    To establish a requirement specification for the seat, a market survey has been conducted. The market survey has included visiting the boat fair in Gothenburg to study the types of seats available on the market and to speak with various experts. Internet searches have also been conducted to identify what types of boat seats are available on the market. A literature search in the field of ergonomics has been made to clarify how a seat should be designed. Laws and requirements regarding boat seats have also been investigated.

    Following the market survey, a specification could be established in consultation with the company. When generating concepts, brainstorming, brainwriting and patent investigation have been the most important methods of inspiration. Brainstorming and brainwriting have been performed a number of occasions with experts in different areas. For example, a former employee at Ullman, a world-leading company in shock absorbing boat seats.

    The definitive concept is a bucket type boat seat. This means that the seat is designed so that the armrests are integrated with the backrest. In this way, the chair also allows lateral support. The chair consists of an injection molded plastic frame with glued on cold foam. Cold foam is a common material uses as a cushion in armchairs to increase comfort. The chair's clothing is made of artificial leather, a material suitable for marine environments as it is both UV-resistant and water resistant. The shock absorption consists of an air bellows, four sliding bearings and two attachment plates in acid-proof steel. To protect the components and eliminate the risk of clamping, the shock absorber is covered with a rubber bellows. The device is mounted between the seat and the boat pedestal.

    The final concept is theoretical only and has not been tested in practice. If the company chooses to proceed with the concept, it is recommended that a prototype be prepared to perform proper tests.

  • 12.
    Bjernstrand, Carl
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Förstudie inför uppförande av laddstationer för elbilar på personalparkering2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In recent years electric cars has increased in numbers, this increase is expected to continue in the coming years. With an increasing number of electric cars, more charging stations are required. Arctic paper Munkedals AB intends to construct charging stations for charging electric cars, primarily for visitors to the factory. There are several parking spaces for employees located next to the factory, and one parking space for visitors. Approximately 120 of the parking lots for the employees has access to sockets for block heaters. To reduce the investment cost, it is beneficial to connect the intended charging stations to the existing installation for the block heaters. The pilot study includes a compilation of data for the existing installation of the block heaters. Based on the compiled data the maximum current load for the existing cables has been calculated, the result of the calculations shows that in 2 centrals it is possible to switch to a higher fuse. The report explains generally about how electric cars and charging stations work. Products from a selection of suppliers that are considered relevant for this work, are described. Solutions and costs have been developed based upon 2 scenarios, where either the existing centrals for block heaters is replaced with charging stations or remains according to current version. The solutions are covered by the parking space next to the 40kV switchgear and a charging station on the parking lots for visitors. Essential for both solutions are the load balancing system, which enables a larger number of charging stations that otherwise wouldn’t be possible regarding to the dimensions of the existing installation. Of the 2 reported alternatives for the construction of charging stations, alternative 2 where the existing block heaters are replaced with charging stations are considered most suitable to proceed with. With this alternative 15 charging stations can be installed to a total cost of approx. 525 kkr. Because of the scalability of the solution, it is recommended to make the installation of the charging stations in stages as the need arises. This means that statistics for the charging stations can be compiled and analyzed to provide a good basis for further expansion. By carrying out the expansion in stages, the total cost will be distributed over time. Initially this means the construction of 1 charging station for visitors to a cost of approx. 110 kkr.

  • 13.
    Bonilla Hernández, Ana Esther
    et al.
    University West, Department of Engineering Science, Research Enviroment Production Technology West. GKN Aerospace Engine Systems AB, Trollhättan, Sweden.
    Beno, Tomas
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Fredriksson, Claes
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Energy and Cost Estimation of a Feature-based Machining Operation on HRSA2017In: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 61, no Supplement C, p. 511-516Article in journal (Refereed)
    Abstract [en]

    Forward-looking manufacturing companies aim for sustainable production with low environmental footprint. This is true also for aerospace engine-makers, although their environmental impact mostly occurs during the use-phase of their products. Materials, such as Nickel alloys, are used for special applications where other materials will not withstand tough working conditions in terms of pressure and temperature. Heat Resistant Super Alloys are, however, considered difficult to machine and cutting tools will wear off rapidly. In this paper, a simple way to estimate the energy required, the cost and environmental footprint to produce a work piece using standard engineering software is presented. The results show that for a hypothetical 3 tonne work piece, Inconel 718 will be considerably cheaper and require less water but will require more energy, and has considerably larger CO2 footprint than Waspaloy.

  • 14.
    Börjesson, Erik
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Beredning av landsbygdsnät i Hassle, Mariestad2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The thesis deals with how preparation work is accomplished in rural networks, by field work, landowner contact, contracts and permit applications. The described preparation work is the basis for the implementation of the project from Ellevio AB.  The reconstruction is performed in order to secure the voltage and get a more weatherproofed network, but also to get rejuvenation of the network. The preparation work is done for PSN Kraftkonsult Eldistribution AB in Vedum and performed using their working methods. The preparation work is performed in the area of Hassle north of the town Mariestad. The project is divided into two interim stages. Stage one is called Hassle sub-station – Källtorp and the second one is Fåleberg – Nolhassle. These two stages are parts of one large reconstruction of the distribution network in the area by Ellevio AB in the near time. Due to the fact that a major rebuilding project of the E20 in the affected area the projector’s intended rout for the cable had to be changed. And it became 1100 m further. The result of the preparation work includes two new 10/04 kV substations, one new cable cabinet, 5850 meters of high-voltage cable and 500 meters low-voltage cable. All the cables will be placed in the ground and for the most they will be plowed down. Substations and cable cabinets will be placed strategically to create the strongest network as possible and for good availability for future maintenance.

  • 15.
    Capriles, Claudia
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Kartläggning av kommunala utvecklingsplaner gällande laddinfrastruktur för elbilar2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Sweden aims to be completely fossil free by 2030. Politicians want to reduce fossil fuel cars while expanding the charging infrastructure for electric cars. The ownership of electric cars has increased by 73% in the last year. The charging infrastructure is increasing and now there are over 3,500 charging points in Sweden. It's possible to apply for investment support through State owned Klimatklivet, which offers financial support up to 50% of the cost of building new charging stations.

    The purpose is to investigate and compare different municipalities' plans regarding the development of charging stations for electric cars, and to compare their methods, strategies and infrastructure. The purpose is also to see which municipalities cooperate with each other and in what way.

    In order to investigate and compare the charging infrastructure in Stockholm, Gothenburg, Malmö, Borås and Trollhättan, interviews were conducted with those in charge of these selected municipalities.

    The result shows that the larger municipalities such as Stockholm, Gothenburg and Malmö have come quite a long way with the charging infrastructure issue, while the smaller municipalities haven't come as far in their development. The larger municipalities have staff who work with the issue and they have major projects in progress, which will be completed by 2018. Stockholm is moving ahead and is expanding their charging infrastructure onto city street buildings and residential neighborhood areas, while Malmö and Gothenburg are more careful and want to prioritize residential neighborhood areas over city streets as they want to continue giving precedence to bicycle- and bus lanes. The laws are the same but are interpreted differently. Common to all is that they often see legislation as an obstacle. Besides Stockholm, the other municipalities don't really know how to proceed. They don't know how to plan for- or who is responsible for developing the charging infrastructure.

    This is a new area which means that most municipalities are still trying to find their model. Better cooperation between municipalities could mean faster and more cost-effective development.

  • 16.
    Cirkic, Aldin
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Qaljaee, Ali
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Utveckling av motoriserad vertikal linjärenhet för kontinuerlig drift2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis work has been carried out with the purpose of developing and defining a motorized vertical linear actuator for continuous operation. In the present situation, the company does not haves a linear actuator that is capable of 1600 millimeters stroke with a load of 100 kilograms. The goal of the thesis is to present a final conceptual solution through a product development process. Software programming or electronics development is available within the company to define the function, which has been considered as a demarcation.

    The project's method is a general product development process. The first step was to establish a project plan. By identifying the client's requirements the specification could be developed which has transferred into a QFD. The next step was to develop different solutions using external and internal search methods and choose a final concept. To ensure that the final concept is safe, two different risk analyzes have been created. The concept was demonstrated in a CAD software and then different calculations and FEM analyzes were performed. The final conceptual solution turned out to be a motorized linear actuator. To make the load weightless, a pneumatic cylinder has been introduced into the system. The positioning of the weight is carried by a ball screw which is driven by a belt and a stepper motor.

    The result of calculations and analyzes of machine elements showed that the device has a theoretical service life of at least 10,000 hours. The developed conceptual solution meets the goal of establishing a final concept for a linear actuator that can handle a stroke of 1600 millimeters with a load of 100 kilograms.

  • 17.
    Darefelt, Kristina
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Vidén, Filip
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Projekthantering hos Vattenfall Eldistribution AB jämfört med andra nätbolag2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis work has been carried out on behalf of Vattenfall Eldistribution AB. The purpose of the work was to evaluate the improvement potential of the design process in the optimization department, with the aim of being able to provide suggestions for improvement of the process which ultimately can lead to a more efficient project flow. It is perceived in the department that there are non-value-creating activities at work that should be reviewed. In order to gain a deeper understanding of the process, the group has performed a network design according to the working process. The purpose of the work was to increase the electrical quality of the abonnee fields. Upon completion of the project, electricity quality could be increased for all customers in the area. For all subscribers except for one were the agreed limit values was within Vattenfall's guidelines. To make a comparison with other ways of working, a study inspired by benchmarking has been conducted at different network companies. Based on the analysis, data has been collected through qualitative interviews. The interviews have been recorded and transcribed. The material has since been sorted and analyzed using a qualitative data matrix. Following the interviews conducted, it was found that the working methods of the various companies largely resemble each other. However, some differences in the performance and view of economic calculations and key ratios could be observed. Differences can also be seen in the size of initiated projects. All participants in the benchmarking study stated that they overall are satisfied with the work process. Analysis of the collected material showed that for some aspects of the work process there is an improvement potential. After completion of work, the conclusion could be drawn that there are some elements in the process that contribute to non-value creation. This has been shown in the form of activities in which any form of forced interruption occurs in the process. Improving or eliminating these steps should provide a more efficient workflow. The management of calculations and key ratios is one of these factors. Proposals were made to clarify the information about the purpose and use of these for employees. Even the shortcomings found in the design tools can contribute to a slower process flow. For these, no proposals for improvement could have been provided, but it was still considered important to emphasize these inadequacies.  

  • 18.
    Dawid, Michael
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Tidseffektivisering av materialflöden och materialhantering inför produktion2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    As competition increases in markets, it is important to use resources efficiently. Santa Maria, which is currently Northern Europe's largest flavoring company, has identified a need to review the material handling and material flow before production at Spice Factory in Mölndal.

    The study conducted at Spice Factory, is a qualitative study made by Michael Dawid from University West. The aim of the study is to present improvement proposals that lead to a material flow before production, which is 20% more time-efficient than the material flow before production at present. The approach is based on the steps taken during a change work. A state analysis is established to get a clear picture of how the flow looks like today. Data collection methods in the study consisted of interviews, benchmarking, observations and literature studies. Then, improvement proposals is presented.

    The improvement proposals presented are zone storage as well as orderly storage at the production buffer. With the help of key figures in the form of throughput times, a time study have been made, to compare the flow times for the material flow at present and with implemented improvement proposals. The time study showed that the material flow with implemented improvement proposals had a shorter throughput time. When implementing the improvement proposals in the material flow, the goal of the study to create a material flow before process that is 20% more efficient, is reached according to the time study.

    In future work, Santa Maria is recommended to apply the improvement proposals among the other process flows at Spice Factory, to create more standardized processes, which creates the basis to work actively with improving all process flows at Spice Factory.

  • 19.
    Degermosse, Christoffer
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Persson, Emil
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Upprätta en standard för vibrationsmätning i provrum2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Volvo Penta is a manufacturer of complete propulsion systems used in yachts and larger ships, besides the propulsion systems they also produce so-called gensets. A genset combines a combustion engine with an electric generator to induce electricity. Volvo have gotten indications of that their gensets in some cases might produce too much vibrations during full loads, therefore they want to investigate the possibility to include vibrational tests of gensets when they are produced. This thesis aims to define a standard which Volvo can use to measure vibrations on the gensets. Within this thesis it should also be assigned how Volvo should align the test equipment, define the tolerances of vibrations for the gensets, define a test routine for each vibration test, create job descriptions to the equipment and evaluate which risks that is involved during vibrational measurements. Several vibrational measurements were made during this project to acquire knowledge about vibrations, their measurement and the equipment. All data that was recorded during these measurements were later saved to an Excel datasheet as a beginning to database for their continued work, these have also been programmed to switch between different colors depending on what value enters a specific cell, the color depends on whether the value exceed the tolerances or not. Vibration measurements have been made upon three different engine sizes, D5, D13 and D16 which depends on that those were the most frequency produced within period of this project. The vibration measurements gave quite different results from one to another which could be backtracked to depend on them being of different specifications. The measurements did also fail to be accurate in some cases because of the gensets being places in different way upon the concrete floor. Every data value that followed from the vibration measurements have been checked to follow the tolerances given by ISO 8528-9. The thesis brings up several bullets with instructions regarding how to install the measure equipment and how to use the software Dewesoft X1. The bullets have been tested by personnel at Volvo to reduce the risk of them including steps that could be misunderstood. The standards have been defined with the help of the people who are going to use them, which is important according to the Lean methodology. During this project, there have been some mistakes done with the vibrations measurements and other problems that have occurred, those have been declared within the thesis. This is done to help Volvo Penta from doing the same errors and thereby eliminate waste of time and money. There is also included one chapter which declares some of the authors thought of what Volvo should do in their further work with vibrational measurements. The thesis includes a chapter for analysis whether Volvo should investigate if the vibration measurements is affected by the gensets being tested within a controlled environment. At Vara the gensets are placed upon a concrete floor while they usually are placed with some vibration dampening material in between the genset and its placement when it has reached the client. The final conclusions are based on two methods where Volvo themselves need to decide over which one to pick. The first one is that Volvo could do single samples at some gensets and thereby doesn’t need to make any further investments regarding measure equipment. The other method is to start measure every genset that’s is produces and save the data to be able to backtrack if the client makes a complaint regarding vibrations. The data could then also be used as support for new product development or quality control, the second method however is associated with large investments. Regardless of which one Volvo is going to choose, it is recommended that Volvo makes a larger amount of vibrational measurements before doing the final choice. This is recommended since Volvo needs a larger statistical basis, they could then rely on the average values and standard deviation to make up their own tolerances.

  • 20.
    Elfwing, Jonny
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Thersthol, Alexander
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Konceptutveckling av provriggsutrustning för framdrivningssystem2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    To carry out different tests on an electric car’s driveline, it often necessary to produce different unique test rigs, which may become costly in terms of both time and money. Thus, in the development of vehicle propulsion systems, there is a need for new modular rigging equipment that can allow shorter set times for switching between different test missions and more tests could be performed at the same time. The purpose of the thesis work is to produce one or more theoretical concepts of a test rig module. In the method section, a theoretical frame of reference is presented, describing the theories and assumptions that were considered relevant for solving the task. The approach to achieving the results includes, among other things, the tools TRIZ, idea generation, literature study and concept screening and weighting matrices. The result includes a proposal for a module-based concept and its characteristics and possibilities are described. The concept consists of three different types of functional elements which are objects that are used to hold and linearize the different components of an electric cars driveline, a module used to position and stabilize the objects and fasteners to attach components to each other and to the T-slots. The final part discusses the implementation and outcome of the thesis work, but there are also suggestions for further studies. The conclusion is that it seems possible to carry out tests with different drivelines using the module-based concept.

  • 21.
    Emami, Iman
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Pilqvist, Martin
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Implementering av översiktsbild för att hjälpa driftoperatörer bistå anvisningar från Starta Sverige2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Vattenfall is currently working to meet the instructions of the project "Starta Sverige" that is created by the Swedish transmission system operators in which a cooperation between different control rooms and control centers will minimize problems during power system restoration after a major disturbance. This work aims to aid the completion of the strategy in Starta Sverige for the control-room operators at Vattenfall to reconnect load after a system failure in the simplest, fastest and safest way possible. This will be done through development of a schematic overview to Vattenfall's operating system.

    The way to achieve this is to conduct interviews with control-room operators and operating system specialists with the purpose of understanding their needs and expectations but also to understand the technical limitations of the operating system. The development has been performed in an iterative way where follow-up interviews weremade to persistently improve the schematic overview.

    The result is a schematic overview roughly the size of an A4-papersheet. Technical limitations prevent some of the control-room operator's wishes to become reality, such asto use graphs to show the remaining active power to reconnect. There is one schematic overview to each of the eight zones of Starta Sverige in Sweden which will contain information about relevant stations, reactive components and transformer taps in addition to showing the voltage and frequency for the connection point to the national transmission grid. According to the instructions of Starta Sverige there is a priority to present the available and used active power since this information is important for system restoration.

    The schematic overview is planned to be implemented in the operating system the same year as the publication of this report, although currently an example is accessible in Vattenfall's operating system. Since the schematic overview is planned to be used after amajor system breakdown there's an uncertainty when the actual use will be.

  • 22.
    Enander, Marcus
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Optimering av tankcontainerlastningar för Akzo Nobel Functional Chemicals i Stenungsund2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Akzo Nobel is a global chemical company. The company is divided into three business areas. The business areas are divided into business units. One of the company’s sites are located in Stenungsund, the site belongs to the business unit Functional Chemicals Ethyleneamines. The plant produces different varieties of ethylene and ethanol amines. Production takes place on a large scale and the products are delivered in barrels and tank containers. This study examines the loading and scheduling of the tank containers. According to the company, the schedule for the loadings causes a bottleneck. The company does not think there is enough room for all orders. Delivery precision is a key indicator the company uses to measure how well the deliveries are performed. Loadings that miss loaded pre-determined loading date differ from the delivery precision. At present, the company is well below the set target for the delivery precision. In order to offer more space in the schedule, Akzo Nobel needs to change how they handle and plan the loadings. The purpose of the study is to provide alternative solutions for how the loadings can be handled and planned. The solutions should focus on reducing the bottleneck effect of the loading terminal. The aim of the study is to identify why the loading terminal is a bottleneck. The aim of the study is also to develop solutions that can increase delivery precision. In order to complete the study, a literature study was conducted. Relevant topics associated with the study area were studied. Example of studied topics where supply chain, logistics and Lean. The literature study worked as a reference frame for the study. The study was based on an analysis of the situation and a benchmark. The purpose of the analysis was to gather information about the business. It was important to be able to derive the causes of the problem. The purpose of the benchmarking was to find other ways to manage and plan the loading terminal. The analysis, benchmarking and literature study then lay the foundation for the development of alternative solutions. The conclusion of the study was that Akzo Nobel's fear of a bottleneck did not quite match the reality. On the other hand, there are good opportunities for improvement. The sales trend also points to increased sales. Which means that in the future a more efficient loading terminal may be needed.

  • 23.
    Gohil, Kuldeepsinh
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Verification and Visualization of Safe Human Robot Collaboration for Robotic Cell2018Independent thesis Advanced level (degree of Master (Two Years)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Robotics and Automation field is booming in today´s scenario. Researchers and Technologist comes up with new ideas in the robotics field to achieve a higher productivity, flexibility and efficiency. To achieve the above goals, it shall be required that human and robot share their work space with each other and works in a collaborative nature. Safety is a main concern and in focus. Robot should not injure the operator in any way during working in robotic cell. In this master thesis main focus is to create a various test plans and validate them to ensure the safety level in robotic cell. The test plan should be validated in a real robot environment. The test plans consist of functional and individual verification of safety devices which are being used in a robotic cell at PTC which is known as smart automation lab. Apart from that it includes design simulation of robotic cells with manikins to ensure validation of safety in virtual environment. Design simulation of robotic cell with manikins are created in RobotStudio 6.06. However, smart components, trap routines, SafeMove and offline program in RAPID have been created. Various test results are incorporated in the results section to ensure the verification and validation of safe human robot collaboration of virtual environment in RobotStudio 6.06.

  • 24.
    Gopinath,, Kiran
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Mimicking of human hand motion on robot arm using point cloud and Machine learning techniques2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Collaborative robots may be required to do complex assembly operations during production and programming the Robot to perform such operations can be a challenging task. If the motions of the human palm could be mimicked on the Robot, it would mitigate the com-plexities involved in teaching such skills to the Robot. This mimicking action could also be used in other applications like robot based painting where it is necessary to capture motion generated by a skilled human hand and reproduce it on a robot.

    To achieve this there may be many methods. A point cloud camera could be used to capture and store point cloud data of an object at different positions and orientations inside the Robot work volume. Corresponding Tool centre point positions and orientations read from the Robot controller serve as labelled data necessary for machine learning.

    The task involves generation of Robot programs to synchronize point cloud capture and robot pose capture resulting in generation of data necessary for machine learning. The point cloud data is generated using Kinect point cloud camera by establishing the communication between the robot and the Kinect V2.

    The objective in this paper is concluded by gathering the point cloud data for limited positions using Kinect V2 which is necessary for machine learning. Since machine learning techniques can be applied for further process huge amount of data is required hence this data is generated.

  • 25.
    Granlund, Erik
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Framtagning av koncept för tryckindikator och informationsöverföring för luftaxel2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The objective of the project has been to develop a concept for both indicating the pressure level in the rolling axle hoses and for transferring this information from the rotating shaft to non-rotating machine parts. The report's literature study describes sensor technology and information-transferring-techniques for non-stationary objects. Study visits and interviews have been made to pay attention to the demands and expectations of future stakeholders on the product. During the concept generation phase, several methods have been used, including function trees and investigations of patents. A total of 21 concepts were generated. During the concept screening and concept scoring phase, an independent engineering student has been used for feedback. A cost analysis based on estimates for the sub-concepts has been carried out before the concept selection. The work resulted in a total of four subconcepts. Two sub-concepts for pressure indication and two sub-concepts for information transfer. Prior to final conceptual selection, more assessment steps should be performed, for example, subcontractors should be contacted regarding quotation requests and a FMEA should be created.

  • 26.
    Göransson, Oskar
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Tessin, Tobias
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Utredning och projektering av smarta elbilsladdstationer2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    An expansive use of electric vehicles and therefore charging stations will eventually lead to a much greater load on the electrical grid. One way to avoid overloads is to fit charging stations with load balancing systems that can adjust every charging station’s power output in relation to the rest of the local substations load. Since cars usually remain parked for long periods of time the load balancer can ensure that the cars only charge with a high amount of power when the general load is low, and thereby the local electrical grid doesn’t risk overloading in consequence of the increased total energy consumption.  This paper includes a market review of the three largest load balancing system suppliers on the Swedish market to clarify what separates the different systems and whether they are applicable in different areas. There will also be a design, carried out through ÅF, of a scenario of 50 charging stations controlled by load balancing systems in the parking lot of a company. In conjunction with this there will be an investigation of the ability to charge 50 of the employee's electric cars during an 8-hour working day with an assumed average commute of 50 km. Which charging stations and load balancing systems that are to be used in the design are determined by those which are best suited to the circumstances of the company. The design has been done in accordance with Swedish standards and with the help of information and software provided by ÅF. The companies that participated in the market investigation were found through Power Circle. According to the customer's requirements, the charging stations needed a power output of 22 kW, and since variations of the power consumption of the plant are present, the load balancing system must be able to measure the load of a transformer to adjust all charging stations power output accordingly. The charging stations and systems that were considered most suitable for the situation were Eldon's. The design included cable sizing, cable layout maps, cost calculations and transformer calculations. Each car needed only about 10 kWh to reach a fully charged state, and the available power of the transformer was sufficient to complete the charging of up to 182 electric cars during the workday. Thus, the cost of both cables and charging stations could have been much lower if the requirement of 22 kW power output was not set.

  • 27.
    Hadzic, Mirella
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Stridsberg, Louise
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Tejp som kraftöverförande fogmetod: en kartläggning2018Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor’s thesis is a survey of adhesive tape as a force-transmitting bonding method in partnership with TechROi Engineering, Trollhättan, Sweden. TechROi Engineering is a consulting company that works with design solutions frequently for the automotive industry and the manufacturing industry. The company wishes to implement taping as a bonding method but wants to evaluate the strength of the adhesive joint. A matrix that consists of characteristics of the tapes and established requirements are conducted with the purpose to enable an obtainment of correlations. The identified requirements are of surface preparation prior application of adhesives and its effects on the durability and the strength of the joint. Two methods for surface preparation is degreasing and abrasion. Further, factors and thus requirements are identified that are necessary whilst conducting an analysis and experiments of the strength of the adhesive joints. The identification of requirements for strength tests are done so with the benefit of a number of selected standards as well as previously conducted tests by researchers. The test methods are primarily intended to evaluate the mechanical properties such as fracture toughness and are sorted in the report depending on the fracture modes. Mode I, mode II and mixed-mode are studied in this thesis. The standardized test methods contain guidelines regarding how the tests shall be conducted. There is an importance to execute the tests, preparations and calibration according to the same circumstances. There is a need to rank the requirements although this may prove difficult since it depends on the application in which the adhesive joint shall be. Additionally, the occurrence of conflicting requirements is dependent on the application. Difficulties with obtaining test methods for mixed-mode arise, particularly due to the absence of standardized tests.

  • 28.
    Hallqvist, Alexandra
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Effektivisering av genomloppstid inom termisk sprutning2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of the thesis was to investigate possible ways to increase the throughput efficiency for a part that is thermally sprayed at GKN Aerospace in Trollhättan.

    The goal of the project was to identify technical solutions that can reduce the lead time for the part by at least 40 % and to investigate improvements that could increase the efficiency for all the products that are coated at the department. The project was carried out because the part had one of the longest process times at the department due to a lot of handwork, masking, low-power spray gun and multiple machine stops during the spray operation. The process has been observed and employees have been interviewed to map the current state. Process documentation and part drawings have also been investigated to understand the requirements and ensure that the solutions are useful for the department. The time each activity took were mapped during the observations. Based on the recorded times histograms were made to investigate which moments are most time consuming and therefore needs to be improved. Through the interviews, observations and the benchmarking, solutions were found and further investigated and assessed to identify which ones are the most effective and implementable. Together with operators and technicians, the possible solutions were discussed for in terms of feasibility and improvements. The technicians also discussed the possible time reductions per activity that the proposed solutions are expected to entail when implemented. To achieve the goal, the masking needs to be changed as the masking tools cause the bouncing of coating on the tools and back on the gun, which makes necessary to stop the spraying process after each stroke. If the masking tools are redesigned, a five-hour deburring operation that is performed at another department can be eliminated.

    The conclusion from this work is that it is possible to increase the process efficiency by 49.5% if the existing spray gun is used. If a higher-powered gun can be employed, it enables further efficiency improvement. The increased efficiency of the process makes it possible that the lead time can be shortened from seven days to four days as the part can be completed in the department.

  • 29.
    Hansson, Hedvig
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Karlsson, Mattias
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Review of stable gas and its safety applications2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis has been performed at Autoliv Sverige AB in Vårgårda. The purpose of the thesis was to increase Autoliv’s knowledge regarding stable gas and its safety applications. To achieve this, a literature study, eight interviews and patent searches has been performed. To broader the understanding further, a concept study of an inflatable life buoy has been made. This idea was presented during a brainstorming session with nine employees at Autoliv. There are some certain characteristics that differentiates gas from solid and liquid substances. The first characteristic is that gases does not have a specific shape or volume. The volume is determined by the size of the container. Another property of gas is that it could be compressed to decrease its volume. The last characteristic is that a contained gas obtain pressure against all walls in the container. If the temperature increases, the pressure will increase as well. In this thesis, stable gas is defined as gases that not react with other gases when it is let out in the air. An unreactive gas means that the valence shell is full and that no electrons are missing or needs to be bound to another molecule. This corresponds to stable gases, for example the noble gases that is presented to the far right in the periodic table of elements. There are several safety products on today’s market that uses stable gas. This thesis includes a screening of three variants of inflatable vests, a bicycle helmet and a lifeboat. These products activate in different ways, both automatically and manually. The purpose of the life buoy was to do design a product that is easier to throw and takes less space than a traditional life buoy. Thus, demonstrate how stable gas can be applied in a real-world scenario. A complete solution has not been developed in this thesis due to the limiting time factor. Basic constraints, such as pressure and volume were calculated to show the necessary requirements on the buoy and the cylinder. The concept study of the inflatable life buoy resulted in a buoy of 35 litres with a cross section diameter of 1.6 dm. To be able to inflate this volume, a cylinder containing 90 ml is required. The dimensions of the cylinder have been calculated to minimize the use of material which resulted in a height and diameter of 50 mm. One of the conclusion of this thesis is that stable gas is useable for safety applications. The choice of gas depends on the specific product and its conditions and requirements. Therefore, a specific gas cannot be considered as the most optimal.

  • 30.
    Hermansson, Alexander
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Palmqvist, Christoffer
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Ett prioriteringssystem för frekvent snabbladdning av el- och laddhybridbussar2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The Swedish government has set a goal to reach a fossil-free vehicle fleet by year 2030. The way against the target has already begun by replacing the fossil-driven vehicles against electric vehicles, including buses in public transport.

    In conjunction with the introduction of electric buses there are a number of different aspects to be considered, where one of them is the time for charging. With the Opportunity Charge fast-loading method you´ll be able to quickly and efficiently load buses at bus stops. A problem with Opportunity Charge is that queues can occur at charging stations. This problem can occur because the buses delays can´t be foreseen in the timetable, but also because only one bus can be served at a time per charging station. This can in turn lead to uncertainties about who will be charge first. There is therefore a need to create a prioritization system that tells in which order each buss should be charge.

    In order to create a priorization system that describes in which order the buses should be loaded, a survey of queue theory and priority systems for rail traffic, air traffic and healthcare was made. With this information the basis of the priority model was made. To the priority model identified and weighted the parameters that was considered to be important for the buses priorities. Two of the most important parameters to observe were battery status and time according to timetable. Based on these to parameters, it was then created a flowchart and also a priority list of remaining parameters. The flow chart together with the priority list then came to be the final priority model that was presented at the end of the report. In the priority model it shows in which order each bus will be charged.

    In the priority model there is a risk that important parameters are missing, which may be due to delimitations and information shortages. The reliability of the prioritization allocation can also be increased by letting traffic companies weighting the parameters against each other.

  • 31.
    Hodzic, Irma
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Karlsson, Elin
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Kartläggning och effektivisering av Oriolas inleveransflöde i centrallagret i Mölnlycke2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Oriola KD Corporation is a Finnish-owned group positioned in the pharmaceutical and distribution industries. The group consists of Oriola AB and has subsidiaries such as Kronan's drug store and Medstop. Oriola AB is active in Finland, Sweden, Latvia, Estonia and Lithuania. In Sweden, the company is established in Stockholm, Mölnlycke and Enköping, where the central logistics business for wholesale trade is located in Mölnlycke and Enköping The purpose of the study is to map and analyse the supply flow at the central warehouse in Mölnlycke, to identify waste and non-value-creating activities. Lastly, proposals for improvement will be presented. Earlier mapping of the supply flow has been done, but since then, some changes been done and an updated analysis and mapping of the flow is required. The students have chosen, in consultation with the supervisor of Oriola AB, to define the mapping and analyze to "Product Type 1" and "Outsourcer 1".  From literature studies for instance in logistics and lean production, interviews with staff at Oriola AB, mapping of the delivery flow, measurement performed and benchmarking done on Volvo Cars in Skövde, good knowledge of the delivery flow was obtained. The focus was on identifying each waste and non-value creation time during the various process steps in the flow. This was evaluated and a potential future position was created through a future detailed process map. The future process map shows the wastages and non-value creation time which is eliminated by implementing the improvement proposals. An important conclusion is that commitment is required from both parts and it is also important to motivate the outsourcer that the changes are necessary. Lastly, this can help Oriola AB to increase the value creation time and short lead times to improve flow efficiency.

  • 32.
    Hultgren, Jessica
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Undersökning av procentuell belastningsnivå på servisledningar anslutna till kundkategorierna flerbostadshus, skolor och förskolor2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor’s thesis has been carried out on behalf of Göteborg Energi Nät AB. The work has a descriptive first part about how new customers are connected to the existing electric grid and the main part of the essay is a survey about power consumption for the customer categories apartment buildings, schools and pre-schools. When customers want to connect a property to the electricity grid, they often request an electric output that the network company perceive to be higher than necessary/what is required. If this is the case, the supply service line connection should have lower load and not be optimally dimensioned from a network company’s perspective. There is no data available that shows what level of load the supply service line connection have, which makes it difficult to start a dialogue with the customer or the electrician regarding requested power. The network companies do not want to take the responsibility to dimension the customer’s facility. The responsibility for this lies with an electrician. The purpose of the thesis is to investigate whether the power demand requested by the customer in advance is higher or lower than the actual maximum consumption. The report examines the level of load that the supply service line connection have and based on that information it gives an estimation of whether the supply service line connection are over or under dimensioned. By obtaining measured values from selected connection points and comparing the actual power consumption with the requested power, calculations can show the load rate of the supply service line connection. In this report, connection points were investigated on 87 apartment buildings, 7 schools, 18 pre-schools and 3 units with school and pre-school under the same connection point. The result of the study shows that the load rates for most electric supply service line connections. For apartment buildings the load rates were 25-34 percent and for schools and pre-schools 20-29 percent. This strengthens the hypothesis that the supply service line connections are over dimensioned. One step in the effort to reduce over dimensioning of the supply service line connections is to try to have a dialogue with the customers or electricians. It is then important to explain that the load can be aggregated and that all loads will not consume maximum power at the same time.

  • 33.
    Håkansson, Petter
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Wadstedt, Lisa
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Calculation model for actuators2017Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis describes the development of a calculation model for estimating costs of actuators in the company SKF Motions Technologies. The aim with the calculation model is to show costs that are not apparent today, e.g. Costs that occur when establishing a new supplier or creating new manuals.  SKF has a standard assortment, including and many variants of these due to special orders. The calculation model being used today does not include the total costs, which results in uncertainties in whether the price is correct or not.   The method used in this thesis includes a theoretical study, to attain understanding of cost calculation and different methods to use.  The theoretical study also included studying other projects with comparable developments. The thesis continued with a research that started with a qualitative approach where semistructured interviews were performed to map the current situation. The information from these interviews were compiled in flow charts to achieve understanding of the processes involved, and to see what generates costs in those processes. Furthermore, it continued with a quantitative research when analyzing orders, customer requirements and costs. Meetings with the company´s finance system expert aimed at understanding the current model, and the factors included. The current model has also been the basis for verifying the new calculation model. After the data collection and the current state analysis, it was clear that the company's costs are scattered and that there is more cost than manufacturing and material, which can be attributed to activities. Such costs are difficult to show in a traditional calculation, and can easily be unnoticed. The thesis resulted in a new calculation model. The model was created to handle more variables than its predecessor, to achieve an insight in how different variables affect the pricing

  • 34.
    Jacobsson, Filip
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Standardiserad manuell hantering av fel- och omärkta lådor på Varner DC2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Varner distribution center in Vänersborg, Sweden, is a part of Varner Retail, which contains brands as Dressman, Cubus, Bik Bok and Volt. The distribution center in Vänersborg was opened in 2016 and will distribute goods to all of the shops included in the group spread across northern parts Europe. The purpose of the newly built distribution center is to make distribution of goods more efficient and lower costs connected to warehouse management and distribution. When the distribution center was built, processes standards was being developed. The tool used to create and manage the standards are called Standard Operating Procedures (SOP). The SOP is presented in a document including determined risks of the process, and a work instruction. Continuous development of the SOP is important to ensure that the documents are up to date and relevant for the process. This project was initiated in response to the demand of a standardized work instruction in managing one of the common failure with handling incoming boxes containing goods. If boxes do not have a bar code or has an incorrect barcode, they have to be managed separately. The automated system will not be able to determine what kind of goods the box contains otherwise. Before this report and its result was presented to Varner Distribution Center no standardized work instruction was available in the existing SOP. This report describes the work progression in developing a work instruction which will be in addition to existing SOP's. It contains description of the methodology used, existing theory, prior scientific work in the subject developing and working with a standardized working instruction. Ending the report will be recommendations for continuous improvement through implementing more standards and educating operating personnel.

  • 35.
    Jannborg, Fredrik
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Pettersson, Mike
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Beredning av nytt distributionsnät i området Långekärrs skola2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis concerns a preparatory work for a distribution power grid 0,4 kV/12 kV in the area Långekärrs school on the island of Tjörn. The preparation is made by TROLKs El & Tele AB at the request from the network owner Ellevio AB and consists of a reconstruction. The project affects 34 subscribers and includes demolition of 3,1 km overhead power lines, construction of 6,4 km underground cable grid and replacement of 4 substations and 8 cable cabinets. This because Ellevio shall maintain their delivery reliability of 99,98 %. In this preparation, there is one field visit to get a better understanding about the project and the conditions. During the field visit photos are taken which are helpful for the placement of the substations, cable grids and cables. Permissions from the County Administrative Board, the municipality and the Swedish Transport Administration are sought, but are done by TROLKs project leader since this preparatory work is done parallel with TROLK. However, the procedure is described in the rapport. In the preparation two options are considered for cabling on a mountain that is a conservation area between Toröd–Vik. One option is to do as it was before and put up new composite poles and overhead cable. But the preparers instead are choosing a second option which means that the cable will be placed in a protection pipe and then attach it to the mountain. Advantages and disadvantages about which side of the road 727 the cable shall be placed at is being considered. Which side of the road is decided by where it will be the least amount of work and intrusion on the subscribers properties. The cost of the project is calculated with the help of Ellevios internal pricelist that is buildt upon the cost index of EBR. The total cost is estimated to 1,4 million SEK.

  • 36.
    Johansson, Dahniel
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Modulbaserad arkitektur av lyftutrustning med tillbehör2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The battery pack that supplies the cars’ electric motor with energy is, on a regular basis, assembled and disassembled to the cars chassis. A product that can aid this procedure is required. The current practice does not satisfy all the customer needs that exist when the battery pack is handled. The identification of such needs and requirements are done by study visits at NEVS (National Electric Vehicle Sweden), study visits and benchmarking at competitors’, market research and questionnaires targeted to NEVS’ staff. During the initial identification of customer needs, more potential customers are discovered, both in the production department and in the aftermarket. As a result, customer needs increase and, in some cases, they are conflicting. Modularization is a method that enables update and variation to a product’s features without being locked into a singular product solution. The main identified customer need is positioning of a battery pack. The positioning is divided into sub-functions, which enables identification of potential modules. From these modules several concept ideas are generated. Parallel with the concept generation, European standards for machines are used to mitigate risks that invariably arise during product operation. Employing matrices, the concept suggestions for the various modules are screened according to a wide array of criteria. The conditions for combining module concepts with each other are analyzed. To minimize the risk of patent infringement, an investigation is performed with the help of the Swedish patent database. Based on the selected concepts, CAD (Computer Aided Design) models are created using Siemens NX 9. Models with critical functions are structurally analyzed by FEA (Finite Element Analysis) in ANSYS Workbench 17.2. The design work is an iterative process and when the models finally are optimized, prototype drawings are created. The drawings are sent to mechanical workshops for cost estimates. As a result, the objective of the project is met; a prototype to facilitate management of a 500 kg battery pack has been realized.

  • 37.
    Kalmertun, Filip
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Tallheden, Henric
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    G R&R-studier på manuella och optiska kontrollmetoder2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis has been performed at GKN Aerospace Sweden AB (GAS) in Trollhättan. The purpose with the study was to perform G R&R-studies on manual and optical control methods to examine the methods capability, reproducibility and repeatability. The result from the G R&R studies were used to identify improvement suggestions in metrology. The thesis has been delimited to ignore variation from various parts from a batch for manual control methods. Operator variation have been ignored from the optical control method.

    The project was performed as a mapping of seven manual control methods and one optical control method. The data collection was performed through several types of measurements. The supervisor at GAS decided what control methods to examine. It was decided what measurements to analyse with consultation from the supervisor and a GOM technician at GAS.

    To analyse the distribution of measurement results through G R&R-studies all measurement results were transmitted to Excel. Nine different measurement devices were used in the study. Ten G R&R studies were performed on manual control methods and 30 on the optical control method. The studies were categorised by what geometry was measured and by what measuring device that were being used. For each category a minimum acceptable tolerance width has been calculated to identify what capability each measuring device has on a specific geometry. The minimum acceptable tolerance width was calculated by multiplying the standard deviation with six and five. The standard deviation multiplied by five gives the area with 99,7 percent of the measurement deviation. The new value is then multiplied by five to get the acceptable deviation of the tolerance width of 20 percent that GAS use. Which gives the minimum acceptable tolerance width.

    All manual control methods have a minimum acceptable tolerance width of under 1 mm while the optical control method has certain measurement results where the deviation was to big to give a reliable result. The reliable results had a minimum acceptable tolerance width of up to 7,46 mm. For the general tolerance widths that was created for manual control methods it is assumed that they can be used in the factory. That assumes that there are good conditions when the measurements are taken and that no factors that was not included in the studies affect the measurements.

    The tolerance widths for the optical control method are different depending on what geometry that is being measured. Thus it cannot be said with confidence that optical measurements can be used on all kinds of geometries. To be able to use optical measurements on more geometries there need to be more studies made with changed conditions.

    For manual control methods the deviation of the measurement results depended mostly on reproducibility. For optical control methods it is not possible to define a specific factor that affects the deviation the most. The factors that have affected the deviation off the optical control method is alignment, how shiny the part is, high concavity and camera access.

    An improvement area that was detected after analysing the G R&R results was the alignment of the part against the nominal CAD drawing. It was revealed that the alignment varied on each scan. The alignment was examined with two tests that revealed that the measurement results deviated with changed alignments.

    It is recommended to ensure that the alignment of the parts that is being evaluated with optical control methods is the same while being used for evaluation of parts or similar studies to avoid a potential source of errors. The calculated tolerance widths might be useful anyways considering that the source of error only slightly affected the measurements.

    The result from the project shows that manual control methods are more accurate than the optical control method on most of the surfaces. As mentioned earlier there are many sources of error that can affect the results from optical measurements. Thus there are potential for improvements of the accuracy for optical measurements in the future to increase the capability.

  • 38.
    Karlsson, Casper
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Analysis of harmonic cross-modulation in HVDC line-commutated converters for practical design purposes2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The use of HVDC has many benefits over HVAC for some specific power transmission purposes. However, two major problems with HVDC links are that the converters produce harmonics and consume reactive power. Electrical filters are used to compensate for this and are a major cost driver of HVDC links. An accurate analysis of the modulation makes it possible to design an optimal filter solution in order to make the link financial viable. This report investigates how the complex cross-modulation phenomenon affects the harmonics. The investigation is limited to line-commutated converter technology (LCC) and excludes the newer voltage-source converter technology (VSC) for which the crossmodulation behavior is very different and requires completely different analysis techniques. This report refers to several MATLAB programs. All of these have been developed by the author as part of this thesis work. The report starts by explaining analytically, with the help of switching functions, how harmonics are cross-modulated across line-commutated converters. It is then explained and shown how a MATLAB program, BOWSER, in the time-domain can be used to calculate accurate switching functions when the converter is supplied with a general voltage source and when the DC current contains ripple. After that it is explained and shown how a second MATLAB program, DONKEYKONG, can be created to model an HVDC link in the frequency domain by iterating BOWSER. The cross-modulation phenomena is then finally analyzed in the frequency domain with the help of DONKEYKONG. The result is that the cross-modulation phenomenon can be divided into two groups, affected by grid and DC-side impedance as well as the overlap angle variation. Which will affect the characteristic and non-characteristic harmonics in different ways. It was found that the characteristic harmonics are affected by the cross-modulation due to grid and DC-side impedance by up to 12 % and that low order non-characteristic harmonics can diverge up to 900 % when the converter was supplied with 1 % fundamental unbalance. It also showed that the non-characteristic harmonics have almost the same amplitude for all power transmission levels of the HVDC link. The report shows that the cross-modulation caused by the grid and DC-side impedance, which is sometimes ignored or treated in a simplified way, can affect the practical filter design a lot. It also shows step by step how the MATLAB programs are created

  • 39.
    Karlsson, Victor
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Product Design for Safer Trampolines in Domestic Use2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The trampoline has become popular among children and adolescences during the recent years which is good because it endorses psychical activity. However, around 100 000 persons are injured every year only in the United States, study shows. Because of the amount of people and because the young age group can obtain long term injuries, there are reasons to find new ways to improve trampoline safety.

    Firstly, the problem was identified by doing data analysis with NEISS which is a database that contains consumer product-related injuries. The data provided information regarding the most critical types of injuries which is caused by trampoline use. With an FMEA the three most critical injuries were identified and those were: lower leg-, lower arm- and internal head injury. Secondly, to understand the cause of the selected injuries, further data analysis and literature studies were done to find connections between the injury mechanism and the anatomy.

    The results show that internal head injuries often occur after fall from the trampoline, lower leg injuries were the result of an incorrect landing, and lower arm fractures were caused by landing on an outstretched arm. In every injury case, the most vulnerable age group was children between 0-6 years of age. An explanation for this is that young children have not had their growth-plates hardened and are therefore more exposed to fractures.

    Lastly, with the help of the information about the injuries and the accidents, product developing process was initiated to create a product that can improve trampoline safety. The process included: identifying customer needs, product specification, conceptualization, system leveled design, and assessments for intellectual properties and patents, regulations, and product safety.

    This resulted in the development of a harness, specifically for backyard trampolines with the purpose to provide the user with stability, dampened landings and from falling off the trampoline. The harness can be used by young children for casual jumping and by older children for doing tricks.

  • 40.
    Kockgård, Rasmus
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Konceptstudie av generering och uppsamlingsnät för förnyelsebar elproduktion från vågkraft2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta arbete visar på olika metoder att hantera den el som genereras i vågkraftverket av företaget Waves4Power. Denna rapport är baserad på Waves4Powers punktabsorberande vågkraftverk som är uppbyggt i form av en boj. Det finns flera möjliga strategier över hur generering och uppsamlingsnät kan se ut och därför är det av intresse att presentera olika alternativ och undersöka det mest lämpliga. Olika typer av generatorer samt omriktare presenteras. Vindkraftsparker offshore har flertalet likheter och liknande förutsättningar som vågkraftsparker, därför sammanförs information om vindkraft för att bidra med kunskap för valet av generator och omriktare. Valet av generator och omriktare är en central del för att leveransen av el ska vara pålitlig och för att relevanta beräkningar ska kunna genomföras. Uppsamlingsnätets design baseras på den tänkta vågkraftsparkens avstånd till land. Tre olika avstånd presenteras; kustnära, medellångt och avstånd långt ute till havs. Kustnära avstånd är aktuellt vid ett litet antal bojar och ett avstånd till land på några få kilometer. Om placering av vågkraftsparken sker långt ute till havs, med ett avstånd över ~50 km måste högspänd likström användas och blir relevant först vid ett stort antal bojar (ca 250 st.). En medellång överföring definieras som 20 – 40 km och detta fall är mest relevant för gällande förutsättningar. Uppsamlingsnätets föreslagna design består av maximalt tio bojar med en total maximal effekt på 2 MW sammankopplade till en gemensam transformator. Överföringen undersöks med tre nominella standardiserade överföringsspänningar som är baserade på den effekt som ska överföras; 11, 22 samt 33 kV. Vid 33 kV överföringsspänning, 2 MW producerad aktiv effekt och en överföringslängd på 40 km är spänningsfallet 0,013 p.u, vid 22 kV överföringsspänning är spänningsfallet 0,024 p.u och vid 11 kV överföringsspänning är spänningsfallet 0,073 p.u. Vid samma förutsättningar är de aktiva effektförlusterna vid 33 kV 37 kW, vid 22 kV 72 kW samt vid 11 kV är förlusterna 215 kW. Även olika variationer på överföringseffekter och kablar undersöks och resultat presenteras. För 11 kV överföringsspänning visar sig ha oacceptabla nivåer på spänningsfall för de flesta undersökta förutsättningarna, därför bör 22 eller 33 kV överföringsspänning väljas. Valet av spänningsnivå och kabel baseras till stor del på ekonomiska faktorer, vilket denna rapport inte omfattar. Däremot visas skillnader mellan olika designer relativt varandra och underlättar därmed valet avsevärt.

  • 41.
    Kyrk, Ellinor
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    An analysis of the logistic elements needed to successfully introduce a new product2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The market is constantly growing for E-commerce companies and it is expanding globally. The world is more united than ever before and can easily reach out to import or export. For E-commerce companies it is crucial to create a structure within the warehouse that is beneficial both in terms of material handling and worker efficiency. A company's efficiency is perhaps its most valued quality – giving logistics an extremely important role to play. For smaller companies it can become problematic with an increase in sales if it means they need to expand their inventory in order to complete larger orders and purchases. The workflow also needs to be able to handle the increase in material handling and orders.

    The purpose with the thesis was to evaluate the current structure in a small warehouse and present ideas to increase efficiency and eliminate waste. With unnecessary waste eliminated, the objective was to optimize the work space and provide ideal conditions for further growth.

    The analyzed company was Ecodi AB. An e-commerce company founded in 2010, the main product is Snus and the company has four suppliers located around Sweden. To expand further they are looking into the possibility of implementing a new product to the current collection.

    To evaluate the structure, the workflow within the warehouse was mapped out and analyzed. Using theories from Lean production and Supply Chain Management, wastes and inefficiencies were highlighted. To gain insight and knowledge of the company, information was gathered using interviews, observations, brainstorming and general research. Connections could then be made using Quality tools (such as the seven quality management tools and the seven quality control tools).

    The results show that implementing the lean production system, along with systems from the supply chain management, increases the efficiency within the warehouse and eliminates waste. The efficiency results in a chain reaction and improves communication which therefore relieves stress from workers. Potential improvements are presented and further research highlighted.

  • 42.
    Lagrosen, Yvonne
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    The Quality Café: developing the World-Café method for organizational learning by including quality management tools2017In: Total quality management and business excellence (Online), ISSN 1478-3363, E-ISSN 1478-3371, p. 1-13Article in journal (Refereed)
    Abstract [en]

    The purpose of this study was to examine the possibility of integrating the World Café method with the affinity diagram tool from quality management. The proposed combination is called the Quality Café. Quality Cafés were carried out at seven spa hotels, one municipality and two student organisations. The cafés were assessed with feedback seminars and questionnaires. The findings show that the method was appreciated by the participants. It contributed to profound dialogues with deepening insights, which stimulated creativity, increased understanding for quality issues and allowed a more holistic view. In addition, the method was experienced as enjoyable and in itself creating coherence. The findings were related to organisational learning theory and several connections were found. The Quality Café should be a useful method for researchers in social science as well as for practitioners. A limitation is that determining the specific effects of the Quality Café method compared to the original World Café is difficult.

  • 43.
    Lagrosen, Yvonne
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Axgärde, Åsa
    University West, Department of Engineering Science, Division of Mathematics, Computer and Surveying Engineering.
    External customer satisfaction through team-development based on appreciative inquiry2017Conference paper (Refereed)
  • 44.
    Larsen, Tobias
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Konstruktion och modularisering av en vagn för en batterilyft2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim of this thesis was to design and modularize a trolley that will be used to mobilize a scissor lift for National Electric Vehicle Sweden AB (NEVS). During a pilot study, it was decided that the product would be modularized in order to fulfill the stakeholder’s different requests with minimal change in the product. Thus, will the trolley in this thesis be designed with modularization in mind NEVS is one of many companies who are developing a fully electrical car with a goal of driving range close to that of a car with a combustion engine. This requires the installation and removal of the power source which is under development, as NEVS tries to find the optimal energy storage for the electrical car.  The method used to develop a modularized product, was modular function deployment (MFD) which contains five-steps. These five steps in the MFD process are; clarify customer requirement, select technical solution, module indication matrix, evaluate concepts, and improve the modules. The heart of MFD is the module indication matrix (MIM) which is done by screening the generated sub-functions against several modular drivers. MFD helps the design engineer to develop a good and robust product structure. The modular drivers in MIM can be company specific or generic for the users.   Another helpful method to develop and design a product is a generic product development, in which the design engineer goes through several steps; e.g. project planning, identification of customer needs, specifies a product specification, concept generation and selection, and concept improvement. These two methods are very like one another and was therefore combined during this thesis since several of the steps relates to one another. The combination of these methods resulted in a modularized product containing; trolley, scissor lift, floating table, jig, positioning indicator, stabilizers, and a diagnostic table.  Whilst this thesis describes the modularisation and development of the mentioned trolley. The modules had different drivers that made them modules; i.e. the trolley had the drivers’ common unit and technical specification whereas the scissor lift was chosen to be a black box since it was a standardized product from a subcontractor.  This thesis resulted in that the end user can choose either a manually operated scissor lift or a power assisted scissor lift depending on their needs. Depending on which type of scissor lift is chosen, does the components of the trolley described in this thesis differ.

  • 45.
    Larsson, Lena
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Larsson, Mikaela
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Wiberg, Caroline
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Beredning av lokalnät Ängås, Etapp 32018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis concerns a preparation work for TROLK El and Tele AB, commissioned by Ellevio. The preparation work covers field visits, construction maps, power grid calculation, state and contract search. The thesis work has been accomplished in addition to the same stage already being prepared by preparers at the company, which enabled comparison in the final phase of our work with the company's preparation. The purpose of this work is to achieve higher operational reliability and thus replace existing overhead cable with underground cable. This is to reduce the long interruptions in the area, which today is a problem, partly due to the ages of the lines and the salty winds. The current area is located in Ängås, Svanesund in the south eastern part of Orust. The work has been limited to Stage 3, which concerns a total of 43 subscribers and is one of four stages in the area. Today, the power grid consists mostly of overhead lines, both low and medium voltage, 0.4 to 12 kV. The stage consists of four pole-mounted and two ground stations replaced by four seriesatellite- and two ELIT-stations. There are also 12 new cable cabinets. The result of the preparation is that approximately 10.6 km of overhead lines is scheduled to be demolished and approximately 12.8 km of underground cable is being prepared. These cables have been dimensioned to meet the conditions for network calculations. A cost calculation for the preparation has been planned according to Ellevio's internal unit price list. The total final cost of the project amounts to SEK 3.1 million. A preparation binder has been established where all material is available at TROLK El and Tele AB in Uddevalla

  • 46.
    Lennartsson, Edvin
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Thorleifsdottir, Birgitta
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Steglöst växelsystem för cykel2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The project tackles the idea of developing a continuous variable transmission (CVT) for bicycles in order to make shifting gears while riding uphill easier. This problem was chosen in hopes of making a difference in the world of cycling for commuters and leisure cyclists, as well as contributing to the environment and society's health and wellbeing. The goal was to design a seamless transmission, where one could choose from an infinite amount of gears on a given interval. Originally, the possibility of shifting gears while stationary was considered a desirable addition, as well as the possibility of an automatic transmission, although neither of these ideas were included in the final concept.

    The project primarily focused on product development, where benchmarking played a large role, especially when it came to gathering knowledge and information on existing CVT's from all markets. The reason for this was that existing commercially successful CVT's within the bicycle market were rather scarce, thus the need for ideas from other markets. Out of all existing CVT's, four types were considered likely to be possibly implemented as bicycle gears. Out of these four, one type surpassed the others during selection: the Variable Diameter Pulley (VDP).

    The question as to how a VDP would be designed, in order to implement and mount it on a bicycle, was answered trough many hours of idea generating and concept selections, until the final concept was left standing. The final concept is a spring and hydraulic controlled VDP transmission, which is regulated through a hand driven pump and has an infinite number of gear ratios within a 240% range.

    The main principle of the concept works, although it is noteworthy that due to large axial forces the springs in the design are far too large for the design to be successfully mounted on a bicycle. Furthermore, the range of the gear ratios can be considered quite small. The conclusion is that the idea is functional, however in order for it to become a successful CVT for a bicycle it requires further work, particularly in regards to finding replacements for the springs.

  • 47.
    Lindqvist, Hugo
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Kristiansson, Robin
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Viktoptimering av maskinrummet på lastfartyg: En studie i topologioptimering för dagens sjöfart2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this bachelor thesis was twofold. First, to investigate whether or not the engine room in cargo ships constructed by Fartygskonstruktioner AB contained dimensions that exceed relevant acquis. Secondly, to give a proposal on how topology optimization could be used to reduce the overall weight of the engine room.

    In order to identify the dimensions of the structure in the engine room a review of drawings was conducted of two different cargo ships constructed by Fartygskonstruktioner AB. These dimensions were compared to acquis from Det Norske Veritas Germanischer Lloyd and Bureau Veritas as well as recommendations from the engine manufacturer. The review confirmed that the floors were oversized. Therefore, the thesis focused on reducing the weight of the floor and the surrounding structure.

    A three-dimensional model of the structure was created in order to make optimization and numerical calculations possible. A finite element analysis was conducted in order to investigate the maximum equivalent stresses. The stresses for the structure in the engine room before topology optimization were calculated to 6 MPa in contrast to 282 MPa which according to Det Norske Veritas Germanischer Lloydand were the lowest allowed maximum equivalent stress.

    The result of the topology optimization showed how the formulation of the floors, engine foundation and the structure below the main engine could be modified in order to reduce the weight of the engine room. The floors were replaced by structure closely resembling props. The engine foundation was altered in such a way that the transverse structure was partly eliminated and the structure between the main engine and the gear including the clutch was removed. The holes that were placed in the structure below the engine foundation attained an increased circumference. The weight of the structure was therefore reduced by 38 % which corresponded to 19 ton.

  • 48.
    Lindqvist, Per
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Utveckling av monteringsstation: Ett konceptförslag till Parker Hannifin2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor thesis was performed at the Company Parker Hannifin AB in Trollhättan, Sweden. They develop and produce hydraulic pumps and engines. Their new product, the F12-XL engine will in future replace older product series. Therefor they need to update their current workstations for final assembly so they are optimized for the new engine and higher production rate. This report has investigated the needs and conditions for a new workstation and from this a concept of a new workstation is developed.

    A literature study was performed regarding workflow for the project, Lean Production and working environment to procure all necessary background information that were required for the project. Since a fully assembled F12-XL weighs 40kg and consist of heavy details the ergonomic aspects are important in this study.

    A pre-study of the current workstation was performed. This showed and confirmed the company suspicions. The result showed that the operator efficiency is about 35% and that the worker lifts up to 18kg without any lifting aid. Decision was taken to continue the project with the goal set to increase the efficiency and reduce the work load for the worker.

    A more refined status analysis was performed to identify the specific problems with the current stations and also taking in consideration the requests for the new one. After studying the analysis a requirement specification was made, here the work was split in to five unique identified problems. For every unique problem a concept generation process was performed and then the final concept parts was put together again to a complete station.

    When evaluating the new station in theory the result showed that the efficiency can be improved from 35% to 74% and the total assembly time for a F12-XL almost can be reduced by half. If using the developed lifting aid the worker never will lift more than 3.8kg, and the worker will maintain an ergonomic correct position during the whole assembly cycle.

  • 49.
    Lundbäck, Jonas
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Karlsson, Lars-Owe
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Uppdatering av selektivplan i ett industrinät2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    When a selective coordination plan is to be updated, there are a lot of data to be collected, verified, and compiled. Understanding the types of fault currents that can occur and what affects their magnitude is fundamental when it comes to establishing and interpreting existing selective plan. There are several reasons for keeping the selective coordination plan in an industrial network updated. One of the primary ones is to limit the spread and impact of major fault currents. In addition, an updated selective plan contributes to maintaining a good facility knowledge, which provides improved conditions for rapid malfunctioning and investigation of deployment opportunities. The work has been carried out for a customer of the consulting company ÅF AB. The industrial network studied is owned by a company that is not mentioned in the report for reasons of confidentiality. Previously, installations have been affected by unselective disconnection, this has been rectified and the company's desire is now to have selectivity throughout the plant. Due to limited time, the provided and retrieved data for a demarcated part of the facility has been modeled in the Vision Network Analysis network software. In short wiring, it is usually difficult to achieve selectivity simply by coordinating the current level. The analysis of the routes detected several deficiencies in relay protection settings, however, the plant has the potential to obtain improved selectivity. Furthermore, proposals for updated selective plans have been developed. Some settings should be adjusted relatively quickly as they have unjustified settings. Other improvement proposals require a deeper investigation of load flows and how the plant is running before decisions can be made that changed settings will be applied. The report can be used as a basis for such a study to achieve full selectivity.

  • 50.
    Långström, Rebecca
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Miljöutredning som verktyg i hållbarhetsarbetet2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The study includes an environmental investigation at the company HMC in Västra Götaland with four centers located in different cities: Borås, Mölndal, Skövde and Uddevalla. HMC is a competence -and logistics center based on care providers' needs in the field of resources and includes various services to support the care chain. The business delivers, supplies and services all types of aids to the entire region. HMC is located under Regionservice, which in turn is part of the Västra Götalandregionen (VGR) and must therefore meet the goals and requirements that come from the top. The environmental study is a part of ensuring that HMC relates to VGR and Regionservice's new environmental plan 2017-2020. The purpose of the study is to investigate which HMC's significant environmental aspects are, and how they can / should be combined with VGR and Regionservice environmental plan for 20172020. In the beginning of the study, literature was studied related to the topic, such as environmental management systems and the impact they have on the corporation, what an environmental study is, and laws and requirements related to environmental issues. The study has been conducted using observations, surveys and interviews with employees at the various centers and data collected to quantify the environmental aspects. In total, 29 environmental aspects have been identified in the corporation and then valued using a routine template from Regionservice. At the evaluation, six environmental aspects were considered significant for the corporation, two of which were positive for HMC; conventional waste, aid, chemicals, transportation, procurement and purchasing and reuse of appliances. The study shows that HMC's corporation are well-connected with VGR and Regionservice new environmental plan for 2017-2020, the significant environmental aspects of the business can be linked to the goals set in the region. HMC should always strive to reduce its environmental impact starting with the significant environmental aspects, and to achieve all the goals, continuous improvements must be made throughout the business.

12 1 - 50 of 70
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf