Change search
Refine search result
1234 101 - 150 of 157
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.
  • 101.
    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)
  • 102.
    Lagrosen, Yvonne
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Lagrosen, Stefan
    Linnaeus University, Department of Marketing, Vaxjo, Sweden.
    Workplace health in wellness: a study of Swedish spa-hotels2019In: International Journal of Quality and Service Sciences, ISSN 1756-669X, E-ISSN 1756-6703, Vol. 11, no 3, p. 395-408Article in journal (Refereed)
    Abstract [en]

    Purpose: In previous research, quality management practices have been found to be related to better health for employees. Dimensions of health-promoting quality leadership have been defined. The purpose of this study was to identify dimensions of workplace health in the wellness industry and relate them to the dimensions of health-promoting quality leadership. Design/methodology/approach: An empirical study involving seven leading spa-hotels in Sweden has been carried out. The first part of the study consisted of quality cafés carried out at each of the hotels. The quality café is a novel method, which has the World Café-method as its basis, combined with quality management techniques. Based on the findings from the quality cafés, an employee survey was developed. Findings: The findings from the study include a definition of five major health dimensions for the employees, namely, happiness, kinship, respect, physical health conditions and control. The dimensions were found to be statistically consistent and correlated with the self-reported health of the respondents. Research limitations/implications: The findings are related to health promotion theory and the dimensions of health-promoting quality leadership. A framework for health leadership in the wellness industry is proposed. The study was only carried out in one country. Practical implications: The framework and the findings should be useful for managers, particularly in the wellness sector, when designing their operations and health promotion activities. Originality/value: Workplace health in the wellness sector, which is growing worldwide, is very scarcely researched. © 2019, Emerald Publishing Limited.

  • 103.
    Lagrosen, Yvonne
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Lagrosen, Stefan
    University West, School of Business, Economics and IT, Division of Business Administration.
    Lind, Linda
    University West, Department of Engineering Science.
    Employee health in the wellness industry2013In: Toulon-Verona Conference XVI. USB-minne, Toulon-Verona Conference , 2013Conference paper (Refereed)
    Abstract [en]

    Employee health is becoming increasingly focused as lacking health cause unnecessary costs while better health has been related to higher quality and performance. This paper reports a study in the wellness sector. As this industry has health as its business mission, it might be reasonable to assume that it is populated by health conscious individuals. The purpose has been to investigate health creating dimensions in the wellness industry. Seven leading Swedish SPA-hotels have been studied using a novel methodology based on the quality café-method. This method has the ‘world café-method’ at its basis but has been developed by inclusion of quality management methods. Quality cafés focusing on health creating aspects have been carried out at the seven hotels with staff from different departments as participants. The resulting data were analysed with the constant comparative method from the grounded theory approach. As a result four dimensions of employee health have been defined. In the paper, the dimensions are described and related to theories of quality management and health promotion. The findings should be valuable for the theoretical understanding of health creating factors in the wellness industry as well as for managers striving to improve the health status of their employees.

  • 104.
    Lagrosen, Yvonne
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Travis, Frederick
    Maharishi University of Management, Center for Brain, Consciousness and Cognition, Fairfield, Iowa, USA).
    Lagrosen, Stefan
    University West, School of Business, Economics and IT, Division of Business Administration.
    Brain integration as a driver for quality management success2012In: International Journal of Quality and Service Sciences, ISSN 1756-669X, E-ISSN 1756-6703, Vol. 4, no 3, p. 253-269Article in journal (Refereed)
    Abstract [en]

    In this paper research leading to quality management success is examined, elaborated, and highlighted in a new profound way by focusing on the most fundamental aspect of the human dimension, the brain. The purpose is to examine the relationship between brain functioning and quality management success. In this examination, the role of core values, profound organizational learning and values of quality management are explained.

     

    Design/methodology/approach

    The paper builds on a conceptual review of research in the areas of quality management success, values of quality management, core values and neurophysiology with focus on brain integration. 

     

    Findings

    The relation of core values with brain functioning is described based on previous research. A framework with logical steps from brain integration, via core values, quality management values and quality management practices to quality management success is developed.

     

    Research limitations/implications

    The paper adds to the understanding of the role brain integration has for success in quality management efforts. A limitation is that it only builds on previous research.

     

    Practical implications

    The findings provide a deeper understanding of quality management success and should thus be valuable for quality managers and leaders striving for excellence for their organisations.

     

    Originality/value

    The importance and crucial role of brain integration for quality management success has not been elaborated in the literature of quality management before.

     

    Keywords

    Quality management, brain integration, core values, organisational learning, quality management success, culture, quality management values, decision-making

     

     

  • 105.
    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.

  • 106.
    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

  • 107.
    Leikvoll, Angela
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Reservdelshållning och kartläggningav PLC-system som underlag till utbytesplan på Perstorp Oxo, Stenungsund2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis project was performed at Perstorp Oxo, a specialty chemicals manufacturer in Stenungsund. There is a need for replacement of switchgear and PLC systems since the access to spare parts is limited and the equipment has exceeded the technical life. A PLC is a programmable logic controller which is used, among other things, in industries to gather information and to control external devices.

    The purpose for this thesis is to produce a basis for an exchange plan for all the PLC systems at the plant by the manufacturers Mitsubishi and Beijer Electronics by survey the plant's installed PLC systems and the access to spare parts.

    The report presents a technical description of PLC-systems including its most important components and a description of maintenance with focus on process industry.

    A survey of the PLC systems at the Perstorp Oxo plant in Stenungsund was produced through the product data management system SmarTeam and in place in the plant. Information of the spare parts was then gathered from Perstorp Oxo's inventory, the asset management system Maximo and from the suppliers. The gathered data was compiled in two Excel documents.

    Many of the installed systems are from the Mitsubishi A-series of which they ceased production in 2006, which means there is limited amounts of spare parts available. Due to this, the PLC systems with components from the A-series should be prioritised for replacement to minimize downtime if a failure occurs.

  • 108.
    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.

  • 109.
    Lidén, Carl
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Gamalielsson, Simon
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Utvärdering av olika energilagringstekniker2020Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This study evaluates the realistic techniques that exists today to store energy, partly how they perform but also covers all the costs that comes with them. From reading upfront before this study it was decided to focus on pumped hydro storage and utility scale battery storage as there were the best.

    As of now there is a big change happening regarding the production of electricity. We are increasing the share of intermittent production, which causes the grid to become unbalanced unless proper regulators are put into the grid. We may have a large spike in production the same time we are seeing a low energy usage. The solutions to this are the type of energy storage mentioned in this report, pumped hydro and batteries. Using the energy storages, you can move the production to when it is needed.

    Chapter 9 in this study investigates profitability with both technologies. The profitability is investigated for daily cycles for both, but also covers weekly, monthly and yearly cycles. For pumped hydro storage the most profit was found using yearly cycles, but monthly was also profitable. Running it with yearly cycles results in a payback-time of 60 years, while monthly cycles gave was 87 years. Daily and weekly cycles were proven to not be profitable since they have a longer payback-time than the expected life of the plant.

    With a payback-time of 169 years battery storage using lithium-ion batteries did not come close to being profitable, however it's not impossible for them to soon considering the constant lowering cost of production for the lithium-ion batteries. An optimistic lifetime for lithium-ion batteries is 40 years and until they come down to that they will not be profitable.

    The conclusion for pumped hydro storage is that if you have the means to create and use the right type it can very well be profitable, you will have to wait at least 60 years however before it has payed of itself. The advantage it has over battery storage is that since it has a longer expected life it has longer time to pa itself off. One big advantage to hydro is however the geographical conditions that are required to being able to build the plant, battery-storages have none of these requirements.

    The conclusion for battery-storage is that they must become cheaper to make if that are to be used for moving power in daily cycles. A conclusion made in this study however suggests that they don't necessarily have to be profitable to see some use in today's energy market.

  • 110.
    Lindmark, Niklas
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Utredning av förläggning av kraftkablar i rör hos Göteborg Energi Nät AB2020Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor's thesis has been carried out at Göteborg Energi Nät AB (hereafter GENAB). Today most of GENAB's projects that deal with installation of cables in a city environment implement the use of pipes. This is done with the motivation that trenches can be closed quicker and that the entire trench section does not need to be open at the same time. There are, however, those who question whether this method is advantageous or not.

    The purpose of this investigation is to compile the different opinions that exist in the company and to identify the advantages and disadvantages with the use of pipes. The report contains a literature study on information about cable construction, dimensioning, fault localization and how this is affected when cables are placed in pipes. An interview study has been carried out with interviews of employees from different departments and professions within GENAB.

    The result of the literature and interview studies showed that the disadvantages with the use of pipes are that it is not possible to ensure that a cables jacket is faultless. Thermal dissipation deteriorates which can lead to being forced to use cables with bigger dimensions. Pipes will often be filled with water, which leads to corrosion of the conductor for cables that are not completely waterproof. Water filled pipes also improve thermal dissipation. Fault localization is made more difficult when cables are placed in pipes.

    The interview study also showed that most of the persons interviewed did not have a positive opinion of the use of pipes and that GENAB's governing documents instruct that the use of pipes should be avoided as much as possible. The reason for the extent of the use of pipes is not because of an active decision on GENAB's part but is rather a decision that is taken by external contractors regardless of the instructions given to them.

    Cost comparisons have been made between different methods of fault correction whether cables are placed in pipes or not. The compared methods were to localize and correct the fault, to localize and correct using halving method and to remove a 100 meter cable from pipe and replace. It could be concluded that it is more expensive to replace the cable than to localize and correct the fault, and using the halving method was the most expensive.

    Cost comparisons have also been done for a chosen project with and without the use of pipes. For five of the six contractor costs the differences relatively small and only one showed a significant difference in cost, being 24 % more expensive without the use of pipes. A suggestion for future work is to have a dialogue with contractors that are responsible for the installation of cables and to demand that the instructions given by GENAB are followed.

  • 111.
    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.

  • 112.
    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.

  • 113.
    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.

  • 114.
    Lundgren, Fredrik
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Montero Martinez, Salvador
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Konceptutveckling av en hundsele som är säker för hunden och passagerare vid krock2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The goal of the work presented in this report is to develop a concept of a dog harness that is safe for both the passenger and the dog during crashes and while traveling in vehicles. The reason for the concept development is that MIM Construction believes that the harnesses available on the market are not properly dimensioned for the forces that arise during collisions. The concept has been developed to simplify its use, make it intuitive and to minimize the risk of incorrect use. The harness design and quality must reflect MIM Construction's vision of creating safety for their customers.

    The generic product development process described by Ulrich and Eppinger in the book Product Development, Construction and Design has been used to generate the concept for the dog harness. This process consists of identifying requirements, generating ideas and concepts, and then selecting one or a few concepts for further development. During this process, interviews have, among other things, been carried out to identify requirements. The house of quality has been used to create the product's target specification and brainstorming has been used to find possible solutions for the dog harness. Concept selection matrices have been used to select a concept for further development. The generic product development process described by Ulrich and Eppinger has proven to be useful for concept development. The method is clear and has clear targets, customer needs have become clear early in the process to the working group.

    The concept that has been developed is a dog harness that is easy to use. The harness is mounted onto the dog by placing the harness on the ground and placing the dog's legs in the openings for the front legs. Then the harness is lifted up and clamped around the dog's chest using a zipper. The adjustment for the harness can be made easy as the harness is mounted on the dog. These properties contribute to the ease of use. The collision safety is achieved through a loop in the harness. The loop extends around the dog's chest and foreleg which is the sturdy part of the dog. The loop is connected to the car's belt system without any components in between, fewer components results in minimized amount of error sources in case of accident.

  • 115.
    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.

  • 116.
    Malki, Daniel
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Shade, Omran
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Augmented Instructions: A study of methods for utilising 3D models in technical instructions2018Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis intends to identify and evaluate appropriate methods for ABB Capacitors to utilise their 3D models instead of 2D representations, with the purpose of reducing costumer’s misconceptions of installation manuals. ABB spends a significant amount of time designing detailed 3D models of their products. These are later converted into 2D representations of the models to create instructions with assembly drawings to their customers. 2D representations are less detailed than the 3D models and require prior experience to give an understanding of the products design. The customers don’t always possess the required experience to install capacitor solutions accordingly, this leads to wrong installations and increased lead-time. Three new visualisation methods were identified and evaluated on behalf of ABB Capacitors requirements and prerequisites. The three methods that were identified are Video recordings, Static-rotatable-3D Model and 3D sequence video. Next step was to identify and evaluate appropriate methods to present the 3D instructions. Initially two methods were considered: Augmented Reality and Virtual Reality. During the testing phase another opportunity was discovered, animated videos with camera views. The conclusion is that ABB Capacitors should replace the current instructions with animated videos with camera views and Augmented Reality experiences. Both suggested methods were demonstrated and evaluated for ABB Capacitors.

    Download full text (pdf)
    fulltext
  • 117.
    Mehmood, Faisal
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Laser Welding of Aluminium in Automotive Industry2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    With all the advantages aluminium (Al) carries being the light weight and sustainable material, the laser welding of Al is tricky and complicated. The major challenges in laser welding of Al are the hot cracking, porosity and reflectivity. The experiments are done in order to understand the laser welding of Al process and analyse the process parameters impacts. In this thesis work, laser welding of Aluminium alloy is done in order to understand the process parameters effects on the weld quality. Experiments are done on the 5754-H22 and 6082-T6 alloys. Welding speed and laser power is kept constant for the experiments, however, laser focus position is varied on the plates. Focus position is kept on the surface of the plate as well as above and below the surface. The butt welding of same material alloy is done on the 3 mm plates. It is been analyzed that Al alloy 6082-T6 is easier to weld and give better weld quality as compared to 5754-H22. The overlap weld is done on 1.5 mm thick plates with CW (continuous wave) welding and PW (pulse weld). The laser welding is done with high speed, therefore, CW welding shows quality weld with no significant undercut or concavity as compared to PW welding method. The focus position above the surface shows quality weld in overlap weld with both PW and CW welding methods.

  • 118.
    Mohandass, Venkataramanan
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    EB-PBF additive manufacturing of Alloy 718: Effect of shot peening on surface characteristics and high temperature corrosion performance2019Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    There is an upsurge of research interest on Alloy 718 additively manufactured (AM) by electron beam powder bed fusion (EB-PBF) technique in aero and land-based gas turbine engines. However, the surface quality of the manufactured components has always been a major challenge. Several factors, including powder particle size, layer thickness, beam parameters, scanning strategies, and inclination angle of the build, govern the surface characteristics. Along with surface roughness resulted from partially melted powder particles, surface defects such as balls, satellites, microcracks as well as up-skin and down-skin surfaces can enhance the vulnerability of the manufactured parts to corrosion. When the surface is unable to withstand the exposed environment adequately, corrosion can be triggered. The surface-induced corrosion failures are increasingly becoming more challenging as the AM components often have complex geometries that render them even more difficult to finish. So, the relatively poor surface finish is the barrier to the full exploitation of the AM industry.

    In the present study, to achieve the desired surface quality, hence an improved high temperature corrosion performance, shot peening was implemented on Alloy 718 parts manufactured by EB-PBF. The high temperature corrosion behavior of the parts was investigated in an ambient air environment at 650 and 800 °C for up to 336 h. The underlying physical and chemical factors at play of the parts exposed to the corrosive environment were investigated too. The effect of topographical features (e.g., surface roughness) and microstructural characteristics (e.g., grain structure, phases, and defects) on high temperature corrosion behavior were analyzed by 3D surface profilometry, hardness test, optical microscopy (OM), scanning electron microscopy (SEM) equipped with energy disperse spectroscopy (EDS), X-ray diffractometry (XRD) and electron backscatter diffraction (EBSD). The surface roughness and high temperature corrosion rate of the parts was significantly reduced after shot peening.

    Download full text (pdf)
    fulltext
  • 119.
    Molldén, Mikael
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Kartläggning av projektet: ”Nyckelfritt” i Uddevalla kommun2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this report, the purpose has been to examine how a project has worked. This includes collecting data from various documents and interviews with people involved in the project, but also by observations of how the project team have been working in the project. In this report, there is a theory section in which a literature study was conducted by looking into contemporary research. The data chapter consists of interviews with 21 different participants, consisting of people working with the project, but also outside the project like people in other municipalities with similar tasks, and people in the municipality who will be affected by the project. The goal has therefore been to map out how the work has been carried out in the project, and to identify possible problems to see what can be improved for future projects, but also how to proceed with this project. In this thesis, the project group's work has been compared with a project model presented in the theory section. The reason why its compared to the project model is to provide a structure to identify how they worked with different parts of the project. This provided a complete overview of the project and a base for identifying improvement opportunities for the project. Improvements include to develop a project model to work and communication must be improved from the lead and down the line (top-down). The competence must also be evaluated before the project starts to see if additional training is needed to avoid delays in the project. Finally, project content and initiatives must be prioritized to ensure good planning and that the project manager is allocated in accordance with time required so this person will be best utilized for the project.   Date

  • 120.
    Nilsen, Ida
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Investerings- och byggnationsanalys av integrerade och fristående strömtransformatorer i Ellevios regionnät2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this diploma thesis is to conduct a technical and economic investigation of two construction methods of current transformers in substations.

    In the report the power transformer, the instrument transformer, the current and voltage transformers are presented. The power transformer is one of the most important components in the power grid, whose main task is to transform electricity from one voltage level to another. The instrument transformers are used to separate high voltage circuits from the measuring instruments. The voltage transformers task is to transform the primary voltages into secondary measurement voltages, and the current transformer main task is to convert primary currents to smaller, standardized secondary currents to get less and more manageable currents that are easier to measure.

    In the thesis, pros and cons with the independent and integrated current transformers are compared in Ellevio's regional network. Two financial calculations are presented and a requirement study about Ellevio's current requirements for measurement with instrument transformers in the regional network is submitted. This has been through extensive surveying and interviews with expert stakeholders in the area.

    The theoretical and economic investigation shows that the investment cost of the integrated current transformer is considerably lower and that it is space saving and that it´s more complicated to correct possible errors on this type of current transformer.

    Download full text (pdf)
    fulltext
  • 121.
    Nilsson, Galina
    et al.
    University West, Department of Engineering Science, Division of Land Surveying and Mathematics. University West, Department of Engineering Science, Division of Mathematics, Computer and Surveying Engineering.
    Luchinskaya, Elena
    Kristiansson, Lilia
    University West, Department of Engineering Science, Division of Process and Product Development. University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Luchinskaya, Daria
    Competence Development and Employability Prospects: Using Non-traditional teaching Methods in a Changing Higher Education Environment2010In: European Conference on educational research: ECER 2010, 23-27 August, Helsinki, 2010, p. 451-Conference paper (Other academic)
    Abstract [en]

    The cultural changes in the modern society create new challenges for educators in Europe. The higher education curriculum has changed from factual knowledge acquisition to developing students' competences and skills in response to a changing professional environment. This paper analyses student experience and academic results in generic and subject-specific competence development in order to evaluate the potential of using problem-based learning (PBL) and project-based (PrBL) learning to increase the  students´ prospects of employment. The fast pace of technological advancements, interdisciplinary work, changing organisations and globalisation of the workplace characterize the modern knowledge-based society. Equipping students with competences required for their social and professional integration, successful career and personal development is a key mission of the higher education sector. Promoting effective teaching and learning methods facilitates the acquisition of professional skills and competence, and at the same time addresses the needs of a diverse student body in higher education. 

    This paper explores the opportunities for implementing PBL and PrBL in a range of programmes at the University West, Sweden and Lancaster University, UK focusing on the development of generic and subject specific competences. This is an on-going collaboration between two universities [1-3]. 

    PBL and PrBL are the examples of collaborative student-focused learning and are supported by constructivist theory [4-6]. These methods encourage deeper learning via meaning construction, connecting ideas as well as creating meaningful artifacts. They stimulate a collaborative process of building among participants, develop self-directed learning, improve student performance and develop a range of study skills through creating an informal environment for learning. 

    Our study was carried out at the University West, Sweden and Lancaster University, UK in 2009. The objectives of the study were: 

    • To assess the level of student-acquired competences, generic and subject-specific (mathematics, engineering)

    • To evaluate the quality of student experience by assessing the impact of PBL and PrBL on students' competence development;

    • To identify the best practice and opportunities for promoting effective teaching and learning methods to enhance student employability prospects. 

    Method

    In Sweden, the first-year students in the ' Surveyors' and the second-year students on 'Basic Principles of Turbomachinery and Hydraulics' undergraduate programmes participated in this study. The lectures were delivered in a traditional way; PBL was used throughout tutorials. The students solved applied mathematical problems aimed at acquiring a set of competences working in small groups. To evaluate the outcomes of this study, each group had to reflect on what they learned during each PBL session, how the session affected their learning process and their competence development. At Lancaster University the first-year mechanical engineering students reflected on their experience of project-based learning. The students had to design, build and test a lifting device working in groups of four. The lectures and tutorials in the programme were conducted in a traditional way. By the end of the project the students responded to a questionnaire consisted of open-ended questions.

    Expected Outcomes

    The results showed that the Swedish students evaluated PBL method highly, finding it useful, activating and valuable. The students indicated they developed problem-solving skills, advanced their analytical skills and ability to apply mathematical tools. These competences are important for their future employment. The students rated collaboration with peers highly. The students at Lancaster University pointed out the necessity of developing time management, communication with peers in the groups and organisational skills. The students stressed that problem-solving and decision-making were very important as they had to choose the right design concept to work with. Assigning tasks and requiring completion by a required date were the skills that the students had to learn while working as a team. The paper concludes with recommendations for promoting PBL and PrBL as they represent useful educational tools which encourage the development of generic and subject-specific competences. They also provide the opportunities to accommodate a diverse range of student learning-styles and academic backgrounds.

     

    References

    1. Nilsson G. and Luchinskaya E. "Problem-based Learning and competence development: a Case Study of Teaching Mathematics to Computer Science Students", Journal of Research in Teacher Education, 2007, No 3. p 13-21.

    2. Nilsson G. and Luchinskaya E. Using Problem-based and Peer-assisted Learning in Teaching Mathematics to University Students: Focus on Competence Development. Paper presented at the European Educational Research Conference, ECER 2009, Vienna, Austria, September 2009.

    3. Luchinskaya E., Nilsson G. and Williams C., "Developing students' competences in the light of Bologna process: the responses from Sweden and Russia". Paper presented at the European Educational Research Conference, ECER 2008, Gothenburg, Sweden, September 2008.

    4. Vygotsky, L. S. Mind in society. The development of higher psychological processes. Cambridge, Harvard University Press, 1978

    5. Phillips, D. Constructivism in education: Opinions and second opinions on controversial issues. Chicago, IL University of Chicago Press, 2000

    6. Light, G., Cox, R., & Calkins, S. (2009) Teaching and learning in higher education: The reflective professional. Thousand Oaks, CA: Sage, 2009. 

  • 122.
    Nilsson, Hannes
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Konstant landanslutning för linfärjor2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor´s thesis has been carried out on behalf of Callenberg Technology Group. The thesis is a preliminary study and shall be used during the change from diesel to constant shore connected for cable operated ferries. A survey on three different distances, 910 m, 650 m and 300 m has been presented in the thesis. The solutions shall be reliable and cost effective.

    Ferries have, during the recent years, been converted from diesel power to modern fossil free solutions. Cable operated ferries is not an exception. The main solution that STA road ferries has been using is constant shore connection. The connection provides enough electricity to operate the ferry. The cable is rolled in and out using a motorized cable reel placed on the ferry. When 300 m or longer distances is used problem accrue, such as, voltage drop and mechanical tensions on the cable. The focus during this bachelor´s thesis has been to focus the studies on the electrical problems.

    To decide if constant shore connection could be used on this application, calculations and a dialogue with various cable reel companies have been carried out. When the transmission voltage for the distances, 300 m and 650 m, should be decided, different voltages have been compared but with the given circumstances 1000 V is best fit for this area of use. It is also the cheapest solution, according to the calculations and estimations made in this thesis. The reel for the 650 m crossing has an outside diameter of 7000 mm and the reel for the 300 m crossing has an outside diameter of 4200 mm.

    According to the calculation and the solution presented in this thesis it is not possible to use a constant shore connected cable ferry with a crossing distance of 910 m. For a cable reel to be used to 910 m crossing distance, different components or another solution needs to be presented. During this thesis it has been concluded that the mechanical tension is a bigger problem than the electrical problems that occur. Mechanical tension is therefore the reason why constant shore connection cannot be used for all cable operated ferry.

    Download full text (pdf)
    fulltext
  • 123.
    Nilsson, Martin
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Projektering av elanslutning av nytt bostadsområde i Rävlanda2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis deals with the pre-design of a new development area for six apartment buildings, two technology buildings and a pump station located in Rävlanda, Härryda municipality. The projection is done on behalf of the network owner Vattenfall Eldistribution AB.

    The service connections for the new area consists of six 125 A electricity subscriptions, two 160A electricity subscriptions and one smaller 25 A electricity subscription. The design will include both 0.4 kV and 12 kV distribution networks. The area's electrical connections are entirely designed, including the dimensioning of a new transformer station and the high and low-voltage supply system.

    The work consist of a comparison of two different solution proposals on how the grid can be designed. The comparison include price, electricity quality and capacity for future power needs.

    The solution proposal that is advocated is solution proposal 2 containing: Holtab N12/3 substation, a 800 kVA transformer, a SDC 440 cable cabinet, 150 m high-voltage cable and 640 m low-voltage cable.

    The total project cost for the solution is 0,66 MSEK.

  • 124.
    Nilsson, Per
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Konstruktion av lyfthjälpmedel till hydraulcylinder2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Among other products, JOAB Försäljnings AB manufactures hook lifts for trucks. The hook lifts are equipped with two hydraulic cylinders. These are lifted into place using round slings and chain hoists. This is not the optimal way of doing it. The reason for this is that the round sling can be incorrectly applied to the cylinder. In a worst-case scenario, the cylinder can be dropped with personal injuries and material damages as a result. The round sling may also cause damage to the cylinder paint through contact which is not desirable.  Thus, the goal of this project is to construct a lifting aid which lifts the cylinder into place in a safe way without damaging their paint. It must also meet Swedish work environment authority (Arbetsmiljöverkets) requirement for CE-marking.  To ensure that the workers will perceive it as helpful in their work, interviews and observations were done to identify their functional demands.  All demands are compiled and the concepts that meet them in various way are sketched. The best suited concept to proceed with was chosen by means of different concept selection methods. At this stage, the workers were also invited to ensure that the right concept was chosen.   Based on the chosen concept, a 3d model was developed. Relevant forces acting on the structure were identified and used in the strength calculations performed. The model was modified until a suitable balance between dimensions, material and strength was achieved. The final result is a lifting aid that will solve JOAB’s assembly problems.

  • 125.
    Nyqvist, William
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Safar, Petrus
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Kartläggning av inkommande gods för en effektiv bemanning2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The study was performed by William Nyqvist and Petrus Safar. The purpose of the study was to map CDC's incoming goods and the information flow between the various departments. The aim was to find relevant parameters that could give the goods receipt manager the right conditions for planning the staffing effectively.

    The theory in the study was obtained from relevant literature books from the library. There were parallels between the theory and what was observed at Volvo and it turned out that the theory was in line with the observation at Volvo.

    During the study, observations and qualitative open interviews were carried out at various departments to get a nuanced picture of the process. Four departments were observed. These departments were: purchase planning, inbound, stansen and goods receipt. The results of the observations and the interviews were used as a basis for the current situation analysis.

    Using the collected information, a survey and four parameters could be determined. Based on these, solutions could be developed to answer the purpose and objectives of the study.

    In the discussion, theory and observations could be linked. The survey showed that there were four parameters that were crucial for the goods receipt manager to be able to plan his staffing. These four parameters are "inadequate communication between the departments","inadequate information", "inadequate documentation program" and "carrier time precision".

    The survey was done using data from the "lastbärarlistan". The charts that were established shows a current situation of incoming goods to the CDC. The information from the"lastbärarlistan" was vague and sometimes even incorrect. An implementation of the AnkRed program was initiated, which will give the staff better conditions for both reporting of trucks and for future follow-ups. A change in the slotplanning was also begun to facilitate the staffing and the flow equalization for the goods receipt manager.

  • 126.
    Olsson, Niklas
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Selberg, Christian
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Numerical simulation and experimental validation of a manufactured wing profile2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The background for this thesis originates from a study of the flow characteristics for an airfoil of the type NACA0018. The aim for this thesis was to evaluate how the characteristics of the flow over the NACA0018 profile depend on surface roughness. Airfoils were manufactured in Aluminum by Computer Numerical Control-milling and in polylactide polymer using a 3D-printer, where some of the profile surfaces were postprocessed with sandpaper in various grain sizes. The surface roughness of the profiles was evaluated in a 3D optical profilometer using white light interferometry from Filmetrics. By that technique 3D surface plots were created. The manufactured airfoils were tested in a wind tunnel where the achieved data was made dimensionless for comparative purposes. The computational fluid dynamics simulations were performed in Ansys Fluent and compared against the wind tunnel data as well as with the data from a previously made study at htw saar. The results from the wind tunnel tests show that the surface roughness has an effect on the flow characteristic of the airfoil, where different angles of stall were observed in the comparison. The difference for the dimensionless numbers coefficient of lift and drag show that the manufactured aluminum airfoil performs better compared to the 3D-Printed airfoil in this study. It has a higher performance mean value for both of these coefficients in a span of angles between 0 and 30 degrees. When compared, the results from the simulations and wind tunnel experiments do match in some cases, where the dimensionless coefficients and stall angle coheres. Further studies based on this report are recommended, where small geometric changes to the profile could be tested and validated.

    Download full text (pdf)
    fulltext
  • 127.
    Ossiansson, Mattias
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Designat utomhusskydd för luftvärmepump2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report describes the development of a designed shelter for an air heat pump. The shelter consists of two consoles in powder lacquered steel with four panels in eight millimeters thick compact laminate plates screwed in place. The protection is intended to be used for airsource heat pumps installed and mounted on house walls. This is a project that has been commissioned by the interior design company Amal House Productions in Åmål, which had planned to manufacture and sell the product. The product development includes determination of design and construction, suitable manufacturing and assembly methods and a risk analysis with FMECA. To determine these criteria, flow simulations and structural strength calculations were made to ensure that the design was suitable for the purpose. The flow simulations were made in the program COMSOL Multiphysics where also FEM calculations were done with load cases. The calculations were done with both snow and wind loads using FEM- and hand calculations. A design study was carried out with various design proposals were presented to several people who gave their opinion on the different design ideas. The development of this product never came to the stage of manufacturing since time could not be given because it was a busy time for the company. This report will therefore only describe the development of a theoretical product concept. The major part of this project was to investigate how air flows are affected by a shelter for an air heat pump. As the designer lacked experience in this field, this work with the study of air flows took most of the total project time. More time was needed to investigate manufacturing methods in more detail and how the design can affect the time of manufacturing. The designer had also wanted to perform practical experimental tests on airflows and sound measurements for a continued study if the product were to go towards production. Even a further design study was needed regarding the design of the air openings. The product is considered by the designer as safe and could be manufactured and used as protection for a real air heat pump. However, it is uncertain how the manufacturing costs look and whether the design is considered attractive, which means that development work may need to be continued.

  • 128.
    Ottosson, Hans
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Utveckling av miljövänligt elverk för personligt bruk2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Möjligheten att utveckla ett vattenkraftverk för personligt bruk har behandlats. Målet var att se om det gick att tillverka ett kraftverk som kan underhålla en avlägsen stuga med ström för att använda TV, dator, lampa och dylikt när den konventionella elen inte finns installerad. Ett koncept utvecklades med syfte att minimera miljöpåverkan. Detta koncept byggdes och begagnade delar användes vid tillverkningen. Anläggningen kunde också testas, vilket visade att tillfredställande resultat erhölls.

  • 129.
    Pettersen, Ann Catrin
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Utlösningsvillkor på gatubelysningsnät2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor's thesis has been performed at Trollhättan Energi Elnät AB with an assignment by Trollhättans Stad. The city Trollhättan owns a street lighting grid with approximately 500 km cables and 12 000 lighting points. The fault clearance is important for the safety of the personal and also a requirement from the rules for electrical installations. During a previous project when documentation was updated and short-circuit calculations performed it was discovered that a sufficient fault clearance was not fulfilled for all areas studied. Based on this the idea of this project arose. The purpose of this project is to produce a solution to manage the fault clearing of selected areas and also to compare calculations performed with measurements.

    Bergkrönet, Blåvingen, Guldvingen, Skoftebytorg, Sågkvarnen, Nybergskulla and Stallbacka are stations which have been investigated and solutions for these stations have been presented in this project. All stations are different and therefore investigated one by one to find a good solution based on economic and personal safety perspective. The problems with too long time for fault clearance could be solved by sectioning, new cables, redistribution of the load on the phases and also adding additional fuses. In station Blåvingen the cost of the proposed work was calculated to approximately 12 000 SEK.

    In the Stallbacka area the plan is to replace all the existing light luminaires to LED lighting. The rated power of the luminaries are 50, 100 and 150 W respectively with a total installed power of 30.6 kW. This corresponds to an energy consumption of 134 MWh/year. In this project a change to Lumistreet LED luminaires with a rated power of 32 and 64 W respectively is presented. The total energy consumption is then estimated to 42 MWh/year which gives an energy saving of 92 MWh/year.

    During this project, measurements of fault impedance and earth fault current have been performed both in the end and the beginning of the electrical installation. According to SS 436 40 00 the measured impedances need to be adjusted with a factor of 1.5 due to the temperature increase in the conductor. It was found that the difference between the calculated and the measured impedances increased the further out in the electrical installation it came. An explanation to this is that each streetlight post contributes with a circuit which is in parallel with the return conductor through an interconnection with the PEN-conductor, and this results in a lower impedance.

  • 130.
    Ringström, Sebastian
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    IP Camera Security Analysis focused on Firmware Reverse Engineering2019Independent thesis Basic level (professional degree), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    This project is focused on the security of IP cameras. The project provides an in-depth approach to conducting firmware reverse engineering as a means of finding potential vulnerabilities that can in turn be used to extract sensitive information (video feed, accounts, passwords and more) from the IP camera or be used as launching point for further attacks into the infrastructure that the IP camera belongs to.

    The project looks at 4 different firmware's from 3 manufacturers; the A and B versions of the D-Link DCS-932L Cloud Camera, the TP-Link NC200 300Mbps Cloud Camera and the Tenvis TH692 Outdoor HD camera. During the reverse engineering of the firmware's belonging to previously mentioned devices a vulnerability checklist is applied to the process in order to provide a structured approach while searching through the firmware. Every firmware looked at during this project was based on an old Kernel with the same potential exploitable vulnerability.

    Wi-Fi default passwords were found for the D-Link firmware versions along with plenty of information in regarding to the wireless parameters such as DHCP and DNS addresses. Tenvis TH692 contained 2 hard-coded passwords that were cracked within 80 minutes with the use of John the Ripper. TP-Link NC200 contained 1 hard-coded password that was almost instantaneously cracked.

  • 131.
    Roshäll, Oskar
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Konstruktion av kretskort för provlåda2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This diploma thesis covers the development of the test equipment RUSUTU which is a test equipment that K3 Elprojektering uses during test and commissioning in control system facilities. The connection of the test equipment is today a time-consuming work and the purpose of this project has been to simplify the connection, through a common circuit board including all functions. Today a function for circuit-breaker simulation is missing in the equipment and a part of the work has been to develop such a function. The front plate and de circuit board is constructed in cad and this part of the work has taken up a large part of time in the project.

    RUSUTU is used for tests in control system facilities and the aim is primarily for power system protection: directional protection, overcurrent protection, earth fault protection, differential protection and busbar protection. To measure signals for relay protection instrument transformers are used. Instrument transformers are divided in current- and voltage transformers. Moreover, arc guards and pressure guards are an additional protection for the switchgear against short-circuits, arcs and pressure rise.

    RUSUTU is equipped with phase indication, polarity test, signal simulation and indication test. The phase indication is used to identify unlabeled conductors in a cable. Polarity tests are used when connecting instrument transformers to determine polarity. Signal simulation is used to simulate 0-20 mA. Indicator tests are used for sensors with alternating contacts.

    RUSUTU's test box is developed with a function breaker simulation that replaces the indication test. The circuit boards are replaced with a common, new polarity function. The function of the circuit-breaker simulation is to receive and send circuit-breaker switch signals between the circuit-breaker and the control system. The circuit-breaker simulator is based on a bistable relay with two alternating outputs.

    The result is a circuit board with function for phase indication, polarity test, signal simulation and indication test. The circuit board is considered a time-saving solution during the assembly work of the test box.

  • 132.
    Ryling, Simon
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Konceptframtagning av CNC-program: Vid nyinstallation2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Parker in Trollhättan manufactures hydraulic-pumps and hydraulic-motors for mobile applications. The front houses for one of their pump series are today manufactured in a machine park from the 80s. The production is adapted for the old CNC-machines and the deburring of the front housings is largely done manually. Parker has invested in a new CNC-machine, an OKUMA MA600II. Before the machine is installed, Parker wants to investigate the possibilities available to make the manufacture of the front houses more effective in the new machine and identify opportunities for automatic machine deburring that frees up time for the operators. Parker also wants to develop a CNC-program concept before the machine is installed so that the test run of the program can begin when the installation is complete.

    By carrying out a time study on the deburring moments and an operation mapping of the machining process, the current situation has been mapped in order to analyze and find improvement proposals. For the deburring, improvement proposals have been developed and compared to be compiled in a priority list on which ones should be tested first. Improvement proposals for the manufacturing process have been developed and a new operating list has been compiled to compare the proposals to the present and evaluate their effects. A program concept for the new multi-operation mill has been developed where subprograms and the main program's structure have been established and an instruction for block numbers, subprogram numbers and variable selection has been developed.

    The project identified possibilities for improvement in manufacturing and the improvements cut down the theoretically calculated cycle time by 8 minutes and 48 seconds, an improvement of 30.5 %. The program structure instruction enables the creation of standardized new programs that facilitate their understanding and readability. The conclusion of the project is that the new machine will be able to make the manufacture of the front housings more effective and there are opportunities for introducing automatic machine deburring.

  • 133.
    Rönnlund, Dennis
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Utredning av möjligheterna för solceller och energilager i västra delarna av Härjeåns elnät2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor's thesis has been carried out on behalf of Rejlers Sweden AB at their office in Gothenburg. A customer to Rejlers, Härjeåns, foresees a future exploitation in the ski areas located in the west parts of Härjedalen, resulting in a higher power demand. This thesis investigates if the expected load increase between year 2025 and 2035 in two of the transformer stations could be covered by local production in the grid from solar panels combined with battery storage, alternatively if it can reduce the transformer peak load. Further it has also been investigated if a new planned 40-kV transmission line can be dimensioned as a line with a dimension that only requires single poles instead of a construction with double poles.

    During the work load data from the grid-owner has been analyzed and compared with the predicted load increase in the area. Based on this work a new load profile has been constructed and used during calculations on solar panels, energy store and loading of transformers and lines.

    The results show that in current situation, with available technology, there is no option that could contribute with sufficient power and energy while being economically justifiable. The estimated investment cost is considerably higher than to strengthen the grid traditionally. For facilities such as solar panels and energy storage it is recommended to start in small scale. Based on the work performed it was shown that the predicted load for year 2035 only requires a transmission line of diameter 329mm² and that this line can be built with elemental poles.

    Download full text (pdf)
    fulltext
  • 134.
    Saarela, Karolina
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Solberg, Malin
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Hållbarhetsredovisning: Risker, möjligheter och gapanalys inför GRI-rapportering på GKN Aerospace Sweden2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The bachelor thesis is about sustainability reporting at GKN Aerospace Sweden (GAS) in Trollhättan. Companies that report their impact on the environment and society has increased. One way to report the effects on economic, environmental and social sustainability is through sustainability reporting, where GRI standards can be used. GRI stands for Global Reporting Initiatives and is an independent organization that produces global guidelines for sustainability reporting. The owner of GAS, Melrose Industries, centrally produces a sustainability report for the entire group, but a part of GAS environmental plan is to produce a sustainability report for the unit in Trollhättan.

    The purpose of the thesis was to develop a basis for GAS further assessment of how the company can proceed with sustainability reporting in accordance with GRI. The two main questions identified were what risks and opportunities exists with GRI reporting, and what GAS needs to do before sustainability reporting is possible.

    In order to answer the two main questions, a case study and a survey were performed. The case study consisted of literature studies to form an idea of how the GRI standards work. Benchmarking was performed to see how other companies work with sustainability reporting. The interviewed companies were Goodpoint and Saab, which both use the GRI standards. To get an even broader view of the subject, Melrose Industries and MTU Aero Engines sustainability reports have been studied. The survey consisted of interviews with the management at GAS and two experts at the company, to identify what material topics from the GRI standards were relevant to report. A gap analysis has also been performed to see what GAS have in place and what needs to be done before a sustainability report is possible.

    The results of the work include risks and opportunities with GRI reporting, and a gap analysis on what material topics and indicators were available and measurable. Some of the risks with GRI reporting were that companies can choose not to report negative aspects and that the report can be used to create an idealized picture of a company's situation. The opportunities with GRI reporting were that it can create credibility, strengthen relationships with society, create learning within the organization, show awareness and more. The gap analysis showed 27 gaps that GAS need to handle before a sustainability report is possible. Furthermore, the company needs to clarify what sustainability means to them, and how an organization of the work with sustainability reporting could look like.

  • 135.
    Sabelsjö, Emanuel
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Kunskap driver ständiga förbättringar2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    To be a competitive and successful company over time it is not enough to have a good product. Factors such as adaption, flexibility and innovation are required to survive and be successful. In order to obtain these factors, a certain characteristic is required: the ability to learn. Calling a company for a “learning organization” is the biggest recognition that can be given. To be a learning organization, continuous improvements are required. In order to reach the level required to learn and improve, a number of steps must be passed on the road. To begin with, there must be a will. After that, skills and knowledge are required, which are then translated into actions. Of these actions, learning and improvement are then achieved. In order to reach the top, a stable foundation is required. The first step, will, is a prerequisite that must be. The next step is competence. So to be successful with continuous improvement, it is a prerequisite to have relevant knowledge. The purpose of this thesis is to identify key areas of knowledge in the work with continuous improvement and to link the knowledge with the success of the improvement work. Thus, it is thought that the results will show which areas make companies successful with the improvement work. The thesis has been done at C2 Management, a consulting company in Stockholm, which helps companies to establish continuous improvements. C2 Management uses an internet based improvement management system, System C2™. There, customers can handle all types of improvement issues such as complaints, customer opinions and deviations. As a first step in the work, a literature study was performed in which six important areas of knowledge linked to continuous improvement were identified. In addition, a case study was performed to identify the impact of the different areas on the improvement work. The case study included interviews with improvement managers on six different units within the same business. The interviews consisted of open questions and questionnaires with predefined answers, where the units were able to rank the knowledge skills in different areas. To see the units status in the improvement work, statistics from System C2™ were analyzed, as the units are customers to C2 Management. The patterns that were distinguished when the statistics and the knowledge rankings were studied is that the areas leadership and way of working are the areas that are most important to possess high competence in, in order to be successful with the improvement work. Date: May 23, 2018 Author(s): Emanuel Sabelsjö

  • 136.
    Samuelsson, Axel
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Framtagning av utvärderingsmodell för mindre energiproduktionsanläggning2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Today's society is in a constant need of energy to function. Heating and cooling of homes and workplaces, operation of house holding and industrial machines and much more. The energy used is often associated with electricity, but it does not necessarily have to be so. For the purpose of heating and cooling, low-value sources of energy, such as residues from the public sector, can be used with good economy and good environmental performance as a result.

    Ramboll Energy, in Vänersborg is consulted by customers for developing competent solutions for how buildings and processes will be supplied with energy. Ramboll have a good insight in finding the best solution to produce energy, but the amount of work for doing so can be reduced.

    The methods of producing energy are many and finding which one of the methods that is most optimal can be a resource-consuming process. Many factors and parameters are involved which all shall be linked to the customer's prerequisites and generate a result. Geo heating, district heating and pellet boilers do all have the capacity to deliver enough energy, to the customer, with a power requirement up to 10MW. The best way to suit the customer can be an assessment model.

    The empiricism that forms the basis of the model has been created by reading books, previous student essays and research reports, searching information on websites and by holding conversations with subject-oriented staff. The implementation phase for developing a model has been divided into parts, such as identifying requirements, effect- and economically limiting parameters, collecting associated costs and climate conditions. Furthermore, a model was created, where customer-specific values are to be entered and a result of which energy source is the best for customer is generated.

    The model has been divided into three parts - a checklist with identified requirement parameters used as a course screening tool, a plant-size calculation tool, and a life cycle cost calculation tool with simplified life cycle analysis. The result has been verified with a number of different scenarios that, depending on the needs, delivered results that vary according to the need.

  • 137.
    Sandström, Kristina
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Sjögren, Karin
    Johansson, Kristina
    University West, Department of Social and Behavioural Studies, Division of Psychology, Pedagogy and Sociology.
    Students Sense of belonging and social media2018In: VILÄR Abstraktbok / [ed] Kristina Johansson, Trollhättan: Högskolan Väst , 2018, p. 8-8Conference paper (Other academic)
    Abstract [en]

    Students who participate in a work-integrated learning (WIL) program - such as Cooperative Education during their university studies are often better prepared for the labour market compared to students who do not receive discipline specific practical experience. But does this better preparedness come with a price? Students who participate in WIL programs compared to non-WIL students often have less access to social support networks and the university community due to their alternating academic and work terms.There is reason to believe that the construct of belonging may have especially important implications among university students. There has been growing attention in recent years to mental illness amongst post-secondary students, particularly during their first few years of university study (Conley, Kirsch, Dickson, & Bryant,2014; Storrie, Ahern, & Tuckett, 2010). Research suggests that a sense of school belonging among university students may help buffer the stress associated with the transition to university (Brunwasser, 2012). Pittman and Richmond (2008), for example, found that students who experienced a positive change in their sense of university belonging throughout their first year tended to experience a drop in levels of anxiety and depression related internalizing behavioural problems. A study by Friedlander, Reid, Shupak, and Cribbie (2007), found that when compared to parental social support, higher levels of perceived social support from friends better predicted a healthy social, emotional, and overall adjustment to university among first-year university students. While evidence points to a relation between peer support and sense of belonging and university students' academic and psychological outcomes, such measures do not account for the impact of Social Media (SM) use. This study aims to understand and describe students perception on the role social media play in sense of belonging and peer support and what the relationship(s) arebetween sense of belonging, peer support, social media and well-being. Is really work integrated learning models a way of supporting the transition between H.E and W.L or are we creating other barriers that's needs to be overcome? This study comprise of a questionnaire and focus groups interviews. 164 individuals completed a 30-45 minutes long questionnaire in English, in the end of the questionnaire the students could choose to say yes to participate in a focus group, and it resulted in five focus groups including 15 students representing all four faculties. Preliminary results indicate that the students emphasize the importance of peer-support during both their academic studies and work periods. The Students seem to find solutions trying to achieve this through SM, it becomes a natural tool and creates a platform for students to connect and support each other virtually. In the presentation we will illustrate more results.

  • 138.
    Schnur, Christopher
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Electron Beam - Powder Bed Fusion Of Alloy 718: Influences Of Contour Parameters On Surface And Microstructural Characteristics2019Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Additive Manufacturing (AM) is an uprising manufacturing process for parts with complex geometries and low production quantities. Within the layer-wise building process, less additional processes are needed, to produce the parts. This allows a building of parts within a reasonable time- and costs-range. Especially industries, such as aerospace industry, can profit from AM. Electron beam – Powder bed fusion (EB-PBF) is a common technique, within AM, to produce metallic parts out of special alloys such as Alloy 718. This superalloy is a Nickle-Iron based alloy that has high mechanical properties, even in elevated temperatures (up to 650ºC). The combination of such material properties with high geometrical freedom creates new opportunities for the industry. However, it must be noted that a significant drawback of AM-techniques is the need for post-processing because of surface roughness- and microstructural characteristics. Commonly, the produced parts utilize mechanical post process such as milling to provide good surface roughness and dimensional accuracy. To reduce the surface roughness in the contour region, and therefore reduce the amount of mechanical post-processing, the present survey elaborates the effect of relevant parameters on contours such as the number of contours, scanning speed, focus offset and beam current. By using Design of Experiments (DOE), two batches were carried out: one screening batch and a two-level-full factorial design. In those batches, 15×15×15 mm cubes were printed with various parameters and, after that, analysed by using White light interferometry (WLI), Optical microscopy (OM) and Scanning electron microscopy (SEM). Furthermore, the program ImageJ was used to perform porosity and melt pool measurements.

    It had been observed that the number of contours had quite a considerable impact on the final surface roughness and the number of defects. Samples with two contours, instead of only one, tend to have a lower surface roughness. Nevertheless, the parameters and their interaction were found to have fundamental effects on the resulting surface roughness and microstructure.

    Download full text (pdf)
    fulltext
  • 139.
    Seidl, Kristoffer
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Sundström, Alexander
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Förstudie i installation av laddstationer för elbilar i en bostadsrättsförening2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This degree project consists of a pre-study in the form of a preliminary planning for a possible construction of charging infrastructure at the Silvertärnan 1 housing cooperative in Trollhättan. The purpose of this project was to conduct an exploratory study of the potential value, methodology and conditions, both technical and economic, for this development. The objective was to deliver a preliminary planning regarding these conditions. Electric vehicles are gaining popularity as time passes and technology evolves. In order to meet the increasing demand for charging these vehicles, more charging stations need to be installed. This applies to public areas, but also villas and housing cooperatives. Hence, it is a topical discussion within housing cooperatives in the event of an installation being of interest. It may be important for these housing cooperatives to be at the forefront of this development in order to maintain their attractive status as housing is adapted to keep up with the development of technology that takes place. The current housing cooperative, Silvertärnan 1, comprises 148 apartments with associated garages. The report contains the theory behind the work and a draft proposal for electric car charging infrastructure in the housing cooperative. The proposal contains a situation assessment of the conditions that exist, both technical and economic, where existing facilities, which consists of cold garages with lightning installations and engine pre-heaters, have been investigated and available power has been calculated. Based upon this, three scenarios with different degrees of development have been formulated, these scenarios consist of 6, 33 and 148 charging stations to be installed. With the scenarios as a basis a design has been created for all three of them, Scenario 1 and 2 have been projected to the installation level, while scenario 3 has been planned more casually when assessed as technically and economically unreasonable. A cost calculation has been performed on scenarios 1 and 2 according to the price of different contractors, and a scalable cost base has also been developed. The report also contains a discussion of the technical and economic results of this project as well as a reflection of the benefit to society that the expansion can lead to. Following an analysis of the technical and economic aspects of the project, the project team has determined that scenario 1 is most appropriate and cost-effective to proceed with. Therefore, it is recommended to initially perform the installation at a small scale to subsequently expand the installation if necessary. The project team finds that the project's goals have been met to some extent, but further planning is required before development takes place.

    Download full text (pdf)
    fulltext
  • 140.
    Selin, David
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Sammanställning och analys av felstatistik på komponentnivå inom Göteborg Energi Nät ABs mellanspänningsnät2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Göteborg Energi Nät AB (hereafter GENAB) is responsible for the power supply for most part of Gothenburg. As the grid age, demands are set on GENAB to proactively replace the components that is approaching its technical lifetime before unplanned interruptions occur. In this context, reliable data for the electrical components are of great importance and these data are today a shortcoming at GENAB.

    The purpose of this investigation was to analyze interruption-reports, compile the causes to the interruptions in the medium voltage grid and identify those cases where components have been responsible for the interruptions. GENAB will thereafter use the statistics in future reinvestment planning and risk analysis.

    What kind of components that have caused the interruptions was investigated and appropriate factors to compile the statistics were identified. Suggestions on how the statistics can be reported in the future to keep it current and searchable was also given.

    Every interruption in GENABs medium voltage grid, within the years 2014 to 2016 was analyzed and the interruption-reports which are written after each interruption formed the base for the investigation. For every interruption, there is a specific number, AO-number, and by searching on this number in a computer system called EAM, more information on many of the interruptions have been obtained. A folder called "Elnät" have also been useful due to different kind of documents in that folder which sometimes turned out to be helpful. The software dpSpatial have also been a good help to find causes to the interruptions. Two interviews have been made with project leaders.

    It turned out that 170 out of 325 analyzed interruptions were caused by components. Joints and cables where the components with most faults while the other components caused significantly less interruptions.

    Conclusions are that it seemed like both old joints like cast iron-joints and oil-joints as well as new joints like EPKJ could cause many interruptions. Among the joints that were unknown, the ones within the age range 41-50 years caused most interruptions.

    The cables FCJJ and AXKJ were the types with the highest fault rate per kilometer and actions should be taken to review the possibility to exchange cables of FCJJ within the age range 41-50 years that contain several joints in the same age rate.

  • 141. Sjögren, Karin
    et al.
    Sandström, Kristina
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Johansson, Kristina
    University West, Department of Social and Behavioural Studies, Division of Psychology, Pedagogy and Sociology.
    What gender barriers do students face in WIL placements?: A comparative study between WIL and Non- WIL Students in an international empirical study.2018In: VILÄR Abstraktbok / [ed] Kristina Johansson, Trollhättan: Högskolan Väst , 2018, p. 6-6Conference paper (Other academic)
    Abstract [en]

    In an earlier project (2014-2015) we found that young adults and specifically women was a exposed group when it came to reported psychological vulnerability. This triggered us to design for a new study to learn more about their sense of belonging in and out of study context. We plan to use a mixed methods approach with individual interviews, focus groups, and a broader online survey on students that are enrolled in WIL-programs, the student need to have completed at least a practicum or coop-period prior to participation in the research study. Our next steps will be to start the ethics protocols for both the University of Waterloo and the University of Toronto. Thereafter Scotland and Sweden apply for theirs. The research questions is: What gender challenges do WIL students face that impact their career identity, sense of belonging, work self-efficacy, overall wellbeing, sociability, and transition to full-time employment after graduation? What gender specific barriers impact WIL students' perceptions of being valued in the workplace (on the team, in meetings)? What gender specific barriers impact WIL students' perceptions of how employers perceive their technical competencies? What resources do WIL students perceive are available to them from their universities and employers to help overcome these barriers? In the interactive session we will discuss both the research questions/content and the methodological approaches.

  • 142.
    Sjöö, Malin
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Karlsson, Patrik
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Teknisk-ekonomisk utvärdering av arbetsmetoder på Vattenfalls distributionsnät2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Vattenfall Eldistribution AB has the responsibility to build, operate, maintain and invest in their grid to ensure a reliable distribution of electricity to their customers. The work on the grid is carried out by entrepreneurs and in the case of planned outage, it is strived for to minimize number of the customers affected. According to the electrical safety instructions (ESA) the following working methods are used when working on the grid; live working (AMS), working in the vicinity of live parts (ANS) and dead working (AUS).

    Vattenfall Eldistribution has noticed a decrease in the number of planned work on their grid carried out without an outage. This can be found in the statistic on established switching programs from years 2011 to 2016. This study evaluates statistics about how often the work methods AUS and AMS are used on the distribution grid. The study also evaluates statistics about the reliability index SAIDI (System Average Interruption Duration Index) in order to see if the choice of work methods affects the reliability of the distribution of electricity. The reliability index SAIDI is reported to Energimarknads-inspektionen (Ei). Vattenfall Eldistribution divides it into two areas, north and south. The last part of the statistics is about accidents caused by electricity where electricians have been involved. This is analyzed to see if the choice of working method is the correlated to accidents. Furthermore, the study includes a technical-economical evaluation on the work methods AUS and AMS to find pros and cons about them.

    The percentage of live working decreased in 2011 to 2014 but increased slightly over the last two years. The biggest decrease was for maintenance work. The statistics about work that hasn't resulted in an outage couldn't be evaluated due to changed definitions. The number of interruption hours couldn't be evaluated either because of changed compilation of hours. During the period 2012 – 2016 the reliability index SAIDI was four times higher in the northern area compared to the southern area.

    During the period 2000 - 2016 the departments for grid operation and electric power supply were involved in 25 - 30 percent of all accidents caused by electricity. The main reasons for the accidents were insufficient control of operating voltage or inadequate protective measures.

    It was detected during the technical-economical evaluation that the total cost for using AMS or AUS is roughly the same. A safe working environment is the key factor when the choice of work method is decided.

  • 143.
    Skärström, Sara
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Thorén, Daniel
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    SAIDI-påverkan på grund av oselektiva felbortkopplingar: en analys baserad på Vattenfall Eldistribution AB:s nät2020Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Swedish Energy Markets Inspectorate has requirements on the electrical distribution companies regarding power quality. Both power failure and planned interruptions in the distribution of electricity is to be reported annually. These interruptions are measured by SAIDI (System Average Interruption Duration Index) and SAIFI (System Average Interruption Frequency Index). These indexes narrate the average interruption duration or interruption frequency per electrical costumer per year, in a certain area.

    This thesis was made on the behalf of Vattenfall Eldistribution AB (VEAB). The purpose of this study was to analyze the annual effect on SAIDI by selectivity issues in power systems. If VEAB wants to reach the SAIDI-goal it is necessary for a study to be carried out. The study should investigate what factors that contributes to an increased SAIDI because of selectivity issues.

    The analyze involved interruptions that had been caused by an incorrect operation of the protection systems and interruptions due to testing of these systems. Only interruptions that lasted longer than three minutes was considered.

    There are components in power systems which are supposed to disconnect the faulty part, they are called protection relays. Unfortunately, they do not detect all faults that occur in the power system. For example, the protection systems can be wrongly configurated and the faulty part will not be disconnected in a properly way.

    The result of the study is that selectivity issues have a significant effect on the annual SAIDI that is reported to Swedish Energy Markets Inspectorate. One of the main reasons to selectivity issues are for example limitations in the protection relays. In conclusion, Vattenfall Eldistribution AB can profit from an investment to decrease SAIDI that is affected by selectivity issues. Older components that lacks the calibration feature could be replaced, and already existing ones that have such a calibration feature could be re-calibrated.

    Download full text (pdf)
    fulltext
  • 144.
    Svensson, Helen
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Josefsson, Alexandra
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Dimensionering av ångföljeledningar till processledningar på Preemraff i Lysekil med avseende på värmeeffekt2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Inom raffinaderier används termisk energi från ånga i system där klena rör, så kallade ångföljeledningar, monteras längs processledningar för att bibehålla processmediet vid en bestämd temperatur genom att tillföra termisk energi. Syftet är att förhindra fasomvandling i processmediet, det vill säga frysning, separering eller stelning, eller för att uppnå lämplig viskositet.Det finns risk att ångföljeledningar längs processledningar är underdimensionerade med avseende på antal ångföljeledningar och rörtyp samt typ av ånga som används. Följden blir att det avges för låg värmeeffekt från ångföljeledningar. Det kan leda till kostsamma driftstopp och behov av ytterligare installation av ångföljeledningar för att åstadkomma lämplig värmeeffekt. För utredning av dimensioneringen tillhandahölls ett beräkningsfall av Preemraff Lysekil vilket innefattande en 12" isolerad processledning innehållande pitch, en trögflytande vätska. Processmediet ska via varmhållning med ångföljeledningar ha en temperatur på 60 °C för en säker uppstart av processen, då pitchen börjar flyta vid 40 °C. En genomgång av värmeöverföringsteorin utfördes för att identifiera samband som behövdes vid beräkning av ångföljeledningars värmeöverföring till processmediet. Förluster för systemet studerades. Värmeöverföringen via den luftspalt som finns mellan ångföljeledning och processledning visade sig vara svår att beräkna. Ett förslag på matematisk beskrivning av luftspalten togs fram. Matematiska modeller ställdes upp för att beräkna processmediets temperatur vid olika arrangemang av ångföljeledningar via energisamband. Ett dimensioneringsverktyg utformades med hjälp av Visual Basic i Excel. Beräkningar validerades genom termisk FEM-analys. Resultaten visar att värmeöverföringen, då ångföljeledningen är placerad under processledningen, är komplex att beskriva och beräkna analytiskt. Värmeöverföringen från luftspalten har stor påverkan på resultatet, medan andra faktorer såsom vindhastigheter i omgivningen har mycket liten påverkan. Det föreslås att ytterligare studier för värmeöverföring via luftspalten bör utföras för att öka reliabiliteten i resultaten. Därtill behöver beräkningarna valideras med hjälp av temperaturmätningar i anläggningen. Den teoretiska del som presenteras i rapporten föreslås ligga till grund för vidareutveckling och förfining av konstruktionshjälpmedlet.

  • 145.
    Svensson, Wictor
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Haydari, Farzad
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Den samhällsekonomiska nyttan av förkortade avbrottstider i 40 kV distributionsnät2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The bachelor’s thesis has been performed for Vattenfall Eldistribution AB, below called Vattenfall. When Vattenfall is building new 40/10 kV stations they normally install circuit-breakers instead of disconnectors in the new 40 kV cable bays. However they aren’t armed with protection, so they’re only used as a coupling tool for switching operations. The work is a technic economic comparison of the socioeconomic benefits of installing protection in the new 40 kV cable bays. The interruption times will be reduced with this installation in the 40 kV distribution grids because of the more selective fault clearance of the malfunction part. The work has also involved an investigation of the benefits of powering the grids meshed instead of radial. The socioeconomic analysis is ranging over 30 years and it’s based on three parts; a) society-based interruption time costs and how it is effected by the different cases, b) the economic difference for power losses between the meshed grid and the radial grid and c) costs for protection equipment. The analysis is based on three cases, case 1: existing radial grid, case 2: radial grid + extended protection equipment and case 3: meshed grid + more advanced protection equipment. The economic calculations for interruption-times, power losses and protection equipment have been performed in Excel, load flow calculations of power losses in the program PSS/E and figures has been drawn in AutoCad. The result has shown that the financial benefit always improves in case 2, i.e. it's profitable to extend the protection equipment because of the economic value of improved costs of interruption time. The meshed system always results in a reduction of the interruption-time cost but the power losses can either decrease or increase and it depends on the configuration and the circumstances in the supplying network. Therefore, it’s not possible to make a general statement on the meshed examples. Different grids need to be investigated separately

    Download full text (pdf)
    fulltext
  • 146.
    Sörensson, Emil
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Vilhelmsson, Joakim
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Undersökning av resistansvärden i brytare och frånskiljare2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Today, maintenance is performed at predetermined time intervals. Eldistribution wants to investigate the possibility of performing a preventive and more proactive maintenance instead based on the state of the asset. Therefore, Eldistribution is developing an Anläggningshälsoindex (AHI). With this, Eldistribution wants to optimize maintenance planning. An AHI consists of a number of parameters collected when inspecting the asset. The resistance in circuit breakers and disconnectors can be one of these parameters. Circuit breakers are used in the high voltage grid to break all kinds of fault currents that may occur. They can also be used to make changes in the grid during work. Disconnector is a device used to get a clear visual breakpoint. Due to its construction it can’t break currents but it can break voltage. The thesis has been carried out both as theoretical study of circuit breakers and disconnectors together with a field study during testing before operation of circuit breakers. A number of intreerviews with experts in the field has also been carried out. The thesis shows that there is a possibility of using resistance in circuit breakers as one of the preventive maintenance parameters. However, in order to be able to use the resistance of the circuit breakers as one of the parameters, it is necessary to produce clear limit values.

    Download full text (pdf)
    fulltext
  • 147.
    Teke, Maysa
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Motion analysis of barge hulls2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Accelerations for three different barge geometries have been analyzed using diffraction solver GeniE/HydroD/WADAM. The analysis includes 5 different sea states simulated with JONSWAP spectra and 6 different headings with 45 degree spreading. Barge geometries are presented in section 5.3. One of the barges with modified geometry shows significantly reduced accelerations compared to original model. See section 6 for complete results. The table below summarizes the accelerations for the 3 barges

  • 148.
    Thelander, Marie
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Vernhamn, Sara
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Kvalitetsbristkostnadsanalys: Utförd på Borealis AB i Stenungsund2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The quality of a product can be defined as its ability to satisfy the customers’ needs and expectations or to exceed them, (Bergman & Klefsjö, 2010). To achieve this definition of quality the company needs to focus on quality development, which means constantly striving to develop the business processes. Increased profitability and sustainability can be achieved by focusing on quality development. It is important to pay attention to shortcomings and to understand the costs involved. This can be accomplished by performing a costs of poor quality analysis, which identifies problem areas and provide the conditions for efficient quality development in the areas where it is needed. A company with focus on quality development is Borealis AB. The company is located in Stenungsund and manufactures polyethylene in the shape of plastic pellets. After manufacturing, the plastic pellets are packaged by an automatic process in sacks. The manufacturing of sacks is a part of the packaging process and are made from tubular film. An analysis of costs of poor quality, regarding cassation, is performed in this study due to that an unknown quantity of tubular film is daily discarded. The aim of this thesis is to map the costs of poor quality regarding cassation and present improvement proposals, which can reduce or eliminate waste. Data collection were obtained by interviews, surveys, observations, measurements and existing data. The collected data has been obtained to enable an analysis of current situation, which clarifies that seven out of eight causes of waste occur in internal processes, storage in the outdoor warehouse, placement of rolls in the indoor storage area, setting of machine A and at the automatic change of roll in machine A. Total costs of poor quality regarding tubular film is estimated to approximately SEK 150 000 annually. This cost only refers to discarded tubular film and other types of cost and forms of waste, which are presented in this study, should also be considered.  The suggested improvements which enables reduced amount of waste are visual control, further development of the lay which enables stacking of pallets, lifting device at the packaging station, routines and standards, and an ergonomic lifting device to lift off bags from the conveyor. In addition to quality development and cost savings, the suggested improvements also reduce the source of waste, which has a positive effect on the company's sustainability work.   As a conclusion, the presented cost may, in a large international company, be perceived less significant, but it is the quality mindset within the company and not the size of the cost that determines future improvement work.

  • 149.
    Tidholm, Gregor
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Larsson, Rikard
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Att lösa kvalitetsbristkostnader med digitala instruktioner2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The project has been carried out at Componenta in Främmestad and the purpose was to investigate the prerequisites for the introduction of digital instructions in the CNC-processing part of the company. The problem was that that inadequate compliance or misinterpretation of work instructions lead to an increased risk of quality deficiencies. The goal was to make proposals for systems that will contribute to reduced quality shortage costs associated with operator's manual work, as well as to report economic calculations showing the economic conditions for the introduction.

    The work began with mapping of problems in terms of economic ground and stakeholder perceptions. In the process of mapping the conditions stakeholders were surveyed on the requirements and wishes of a future system, the requirements were summarized in a list of requirements. When the current situation and requirements were summarized, supplier comparison started. About 40 systems were studied and then scaled down to about ten which were compared in detail. The comparison considered technical and economic aspects, two systems were chosen for further work. Economic calculations and side effects of both systems where reported, and the results show that both systems have a payback time of less than one year. Over the first five years, a surplus from the investment is expected to be *** SEK. The analysis is that the company should ensure that the problem is solitary and then start working on standardized instructions.

    The authors recommend that Componenta initially starts using a system called Dozuki, which is a system for digital instructions. In the longer term, the need for a more comprehensive system should be evaluated, alternatively, to initiate collaboration with the company Scout systems to evaluate what their system can do for the company.

  • 150.
    Urbath, Christopher
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Hur kan Single Minute Exchange of Die (SMED) implementeras för att minska ställtider?2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The scientific report is written at the Department of Engineering Science, University West in Trollhättan. Hofpartner AB, a steel company that develop and produce rollers, chucks and smart lifting aids, has given the assignment to investigate if their production is effective. The CEO has been informed that there is a method called SMED and would like to examine if this can be applied to Hofpartner AB production. The assignment includes an investigation of the operators working process and if the new machine can be made effective, as well as conduct a pilot study to investigate if an implementation of SMED can be applied with the intention to reduce downtimes. Literature study, interviews and observations are methods that form the bases for the degree project. The theories that have been studied have a direct link to the SMED-method. To get an overview of how effective Hofpartner AB production is, a status analysis has been performed for the categories; Machine and tools, Work place, Change between two fixtures and adjustment for processing. Several observations have been carried out regarding the operators working process, and also the availability of the capacity of the machine. Collected data has been divided into internal and external downtimes, this to be able to categorise the different phases and distinguish internal and external downtimes respectively. In order for a company to be able to use the full capacity of a machine as well as obtain an effective working process, the results must show that the internal downtimes converts to external downtimes. Based on the completed status analysis and with the support of SMED-method, the results have shown that Hofpartner AB has too long internal downtimes in their production.

1234 101 - 150 of 157
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