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  • 1.
    Aarenstrup, Filip
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Effektivisering av informationsflödet mellan säljkontoren i orderprocessen inom Höganäs AB2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Höganäs AB is one of Sweden’s oldest companies established in 1797, the company have 1900 employees today and is one of the leading producers of metal powder in the world. From the subsidiary Höganäs Sweden AB 300,000 tonnes of metal powder was dispatched 2015. The material was sent to Höganäs customers that mainly consist of component manufacturers in the automotive, wood and other manufacturing industry.

    The purpose of this thesis is to suggest a new operational working process that will increase the efficiency of the order handling process. Throughout the investigation the present state of the process has been outlined and identified at Höganäs Sweden AB.

    Höganäs AB’s order handling process consists of many operations and interfaces that are involved to secure high delivery performance to the customers. The complexity of the process increases due to this and demands an effective communication between involved interfaces. The order handling process may vary depending on factors such as delivery terms, payment terms, transport, product, country, customs clearance and quantity. The variation of these factors makes it difficult to implement a standardized approach.

    It is valuable to Höganäs AB to streamline the process. The data recorded in the business system from the customer order is an important basis for production-, dispatch- and planning departments. The recorded data can be obtained earlier if high quality conditions are created that can increase the delivery performance and affect customer relationships positively.

    With support from the collected theory and the study that contains qualitative and quantitative primary data from Höganäs Sweden AB a new working process have been formed that excels the efficiency in the process. The new approach streamlines the overall process time by 40 percent and the overall lead time with 32 percent. In addition to the increased efficiency the number of information exchanges in the process was reduced significantly.

  • 2.
    Abbas, Tabassom
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Sandblom, Sofia
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Digitalisering av arbetsflöde för avvikelsehantering på inköpt material: En fallstudie utförd på Nolato Cerbo AB i Trollhättan2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A case study was performed at Nolato Cerbo AB in Trollhättan, with the objective to design a suggestion of a digital workflow for deviation handlingfor purchased material. The following questions were issued to fulfil the objective of the case study:

    • Is a workflow for deviation handling for purchased material possible to digitalize in order to facilitate documentation, traceability and information handling?

    • How should the workflow be designed in order to reach the involved personnel's requirements and needs?

    • Which advantages and disadvantages could emerge from the implementation of a digital workflow? To be able to map the current workflow and its issues, interviews with the involved departments were conducted. The interviews also brought up the employees' opinions of a digital workflow. A flowchart was created and waste in the workflow was identified. A benchmarking was performed at Varner Retail Logistics AB, to get an insight of how another company uses a digital workflow for deviation handling. A new flowchart for deviation handling for purchased material was created, where the manual parts of the flow were digitalized. After a test had been performed with concerned employees, it could be stated that the digital workflow will facilitate documentation, traceability and information handling. The requirements and needs for the involved personnel were also fulfilled. Advantages that the respondents consider can be achieved with the digital workflow was time save, no manual handling of paper, a faster distribution of information and that the correct information will be filled in from the beginning. Disadvantages that the respondents consider can emerge is that it will take some time for the employees to learn and adapt to the new way of working and the limitations of the mobileapplication. The conclusions that were drawn was that the digital workflow will be able to be used if it's designed according to the suggestion, although changes to the workflow might be performed in the future. There might also be employees at Nolato CerboAB which afraid of digitalization and changes. For the implementation to be successful, an education and information about the possibilities that digitalization brings will be required.

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  • 3.
    Abdallah, Karl
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Sisodia, Raoul
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Kvalitetsproblem med inre dörrpanel2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis work has been conducted at International Automotive Components Group in Torslanda, Sweden. The company produces door panels, instrument panels, consoles and cockpits for the automotive industry.

    During the production of door panels, defects such as pressure marks and scratches emerge which results in scrap and rework. The objective of the thesis work was to identify the causes of pressure marks and scratches and also to suggest measures to reduce the amount of scrap and rework on door panels.

    Through observations, interviews and experiments, several causes leading to pressure marks and scratches on door panels were identified. Small pieces of plastics on fixtures, the operator's rough handling and specific process steps are the main causes that result in pressure marks and scratches.

    Pressure marks and scratches emerge at several places on the door panels during the production. To reduce the amount of pressure marks and scratches both short-term and long-term measures were suggested. Some of the measures are:

    •  Use vacuum cleaners at some stations
    •  Add padding on unpadded areas and edges
    •  Make new instructions that emphasize to keep production stations clean and to avoid rough handling
    •  Introduce workshops to engage operators
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  • 4.
    Abdallah, Kristian
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Pedestrian Protection System: Hood lift study2015Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Every year approximately 400 000 pedestrians are killed worldwide in road related injuries where children and elderly are the most exposed age groups. The design of the front-end of a vehicle and the structural stiffness have a significant influence on the kinematics and injury risks of the pedestrian body. To create a clearance between the rigid hood structure and the hood, the hood is lifted. A lifted hood does however not provide protection over the cowl, windscreen and A-pillar areas.

    This study is performed at Autoliv Sverige AB and the purpose is to examine how fast the hood can be lifted 100 mm using a pedestrian protection airbag. The airbag give an extended protection while covering the cowl, windscreen and A-pillar areas.

    A concept generation session was performed where modifications of the current pedestrian protection airbag, for a faster hood lift, were proposed. The generated concepts proceeded to a concept screening session where the Autoliv evaluation matrix was used.

    The selected concepts went further to static testing where the performance of each concept was tested. The performance include the lift time of 100 mm for the most rearward section of the hood, positioning of the cushion and pressure distribution. The tests were carried out in a room temperature environment.

    To conclude the thesis work, one winning concept could not be obtained. Two concepts excelled themselves from all the concepts and a difference in the performances between these two concepts could not be found.

    In this thesis no calculations on costs such as material costs and manufacturing costs has been made. This can be the major aspect on choosing one winning concept but due to the fact that there is no time for a cost analysis in this thesis, the PPA development team will take over.

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  • 5. Abdul Rashid, S. H.
    et al.
    Eriksson, Kristina M.
    University West, Department of Engineering Science, Division of Production Systems.
    Human Values: Increasing importance in the automotive production systems2001Conference paper (Refereed)
  • 6.
    Abdullah, Loai
    et al.
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Hansson, Robert
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Dimensionering av skruvförband i spannmålselevator2013Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
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  • 7.
    Abdulmohsin, Haider
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Prediction of cutting forces for second layer removal in metal cutting process2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Machining processes studies and theories can be referred back to the beginnings of machine age, but recent developments in information technologies (Computers, processors, etc.) make it easier for the researchers to predict material behaviour during different machining processes.

    Machining is not a simple process to analyse due to the amount of variables affecting on it, in this study the author is trying to analyse and explain the forces acting on a AISI 1045 workpiece during the removal of material’s second layer using FEM, one of the challenging problems was to re implement the forces resulted from the first layer removal in the new cutting process to give the study more reliable output to compare with the actual results obtained previously the procedure used to reach this is explained in chapter 3, there are many software used to define FEM analysis each has its benefits and limitations, LS-DYNA which is used in this study is one of those software "it is capable of simulating nonlinear problems involving large deformations, sophisticated material models and complex contact conditions".

    As well as LS-DYNA, HyperMesh and Ls-prepost are used in this study to mesh the tools and workpiece, and pre-set the material parameters respectively.

  • 8.
    Abebe Mengistu, Bemnet
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Internal sensor measurement to reduce the need of coordinate measuring machines2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis presents the approach of determining the machining  errors on a five axis CNC machine using sensors already fitted in the machine to extract valuable data up on process called CITE(CNC Integrity Tracing Equipment) system and measuring the machined workpiece geometry using CMM(Coordinate measurement machine). CITE measurement system is the data acquisition hardware and software system developed by University West for collecting position information from encoders of a machine tool. The collected information could then be used to assess the quality and adjustment of a machine tool, CNC programs and the CNC control parameters. The aim of this study is to examine the roundness and concentricity detection capacity of the CITE system by conducting different milling methods and a turning process. In an example cutting of a workpiece, the CITE measurement system was used for recording the machining process. After that, radial error, centre point deviation and circle roundness errors, analysed using MATLAB based on collected CNC tool movement data. CMM measurement used to verify the results obtained from the CITE measurement system. The investigation conducted on the small circles shows that the CITE measurement system have capability of identifying radial errors in different method of millings (slot, up and down). Centre point deviation and roundness errors measured by the CITE system doesn`t show significant differences between milling methods as seen on CMM measurement.

  • 9.
    Abrahamsen, Alexandra
    University West, Department of Engineering Science.
    Data Science for In-process Chatter Classification2022Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Milling is one of the most crucial processes in machining. Every industry demands a stable milling process for a smoother finish and material cost reduction. Chatter is a vibrating phenomenon which affects the workpiece's quality, its dimensional accuracy, and tool life. It is required to classify the chatter phenomenon to devise an effective chatter prevention strategy.

    Several classification strategies are being used, including frequency and time-related strategies. Since the chattering phenomenon is a frequency-based phenomenon so a frequency-based feature set can be of vital importance. However, frequency-based strategies have a problem of noise. The noise problem can be addressed by combining frequency and time-domain methods.

    Thus, a hybrid approach based on the frequency and time-based feature set is developed and used in conjunction with k-means-based unsupervised learning to come up with a practical but reliable classifier. The proposed classifier algorithm offers good performance, clearly distinguishing between chatter and stable conditions.

    Based on the chatter classification in this work, it is possible to identify thresholds for chattering detection. It is essential to mention that the thresholds obtained from this work will only be useful for the machine and tool used in the experiments and will not be of use for other machines and need more investigation. 

  • 10.
    Abrahamsen, Alexandra
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Life cycle assessment of grit blasting and femtosecond laser patterning: a comparison of surface preparation techniques2020Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of the study is to assess the life cycle impacts of conventional grit-blasting and FSL patterning as an alternative surface preparation. FSL has notable advantages in that it does not leave any contaminationon surface, whereas grit blasting does. By employment of Life Cycle Analysis (LCA) method, a powerful methodology for evaluating the environmental impacts of the process used in the production of a product could be utilised. The LCA methodology largely relies on data about inputs, outputs and environmental impacts of a process. It has four iterative phases, namely clear definition of goal and scope, inventory analysis, impact assessment and interpretation. The goal was set as the evaluation of the environmental impact between conventional grit-blasting and femtosecond laser patterning. The scope restricted the system boundary to 'cradle to gate' without the consideration of machinery. Data was gathered from multiple sources under limitations imposed by COVID-19 and other factors. The impact assessment employed the LCA Impact 2002+ Endpoint methodology to process data inputs to determine the comparative impacts of both systems on climate change, ecosystem quality, resources, and human health. The interpretation of the LCA Impact 2002+ method applied to a Canadian scenario showed that the femtosecond laser was significantly less damaging on all metrics except for human health. Human health was disadvantaged for the femtosecond laser solely because of ionising radiation, which could potentially be mitigated through radiation safety protocols. A sensitivity analysis using the Impact 2002+ model was run for India. The results were very different and showed less damage to all four categories for grit blasting. This is driven by the higher electricity consumption (57 times more) of the femtosecond laser process combined with the difference in the source of power generation in India, where the generation of electricity causes more damage due to its greater reliance on non-renewable fossil fuels. Further exploration can be done to enhance the data inputs into this model as per the limitations and assumptions already stated.

  • 11.
    Abrahamsson, Amanda
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Wilsson, Camilla
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Framtagning av koncept för en ergonomisk materialhantering i en tillverkningsgrupp2022Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor´s thesis has been carried out at Parker Hannifin Manufacturing Sweden AB in Trollhattan. The thesis presents concept development for a workspace in a manufacturing group that processes details with a maximum weight of 13 kg. The details are moved between trolleys and the milling machine center Heckert 4, all work is performed on a height-adjustable floor to give the operator the right conditions for working with the machine. The affected workspace is currently not ergonomically adapted for the operators when ergonomic risks in the form of manual lifting, rotations and bent working positions occur in the daily work. The purpose of this thesis is therefore to improve the workspace of the milling machine center Heckert 4 in such a way that it becomes more ergonomic and risk-free for the operators. The goal of this thesis was to generate a concept for a more ergonomic workspace and to prevent the risk of injuries forthe operators.

    The work began with information being collected in the form of observations and interviews. Through this, a description of the current situation could be established, and a list of needs and requirements was put together. A risk analysis was carried out on the current situation and contributed to additional requirements in the list. Subsequently, ideas were generated for solutions to the problems that were highlighted in the current situation description. These were then combined into concepts that contained solutions for the ergonomic risks that were earlier identified. With a concept screening matrix, the concepts were screened down and assessed against the current situation. The highest ranked concepts were further evaluated in a concept scoring matrix that ultimately resulted in a winning concept. The winning concept was further modeled and improved.

    The resulting concept that is presented to Parker for continued work is concept I+. Concept I+ consists of two movable surfaces located on the height-adjustable floor at each side of Heckert 4. Two counters are located on either side of the floor to ease the work for the operators. One counter is equipped with a tool stand with space for the tool kittingtrays to be used to kit the necessary tools.

    The concept I+ reduces ergonomic risks by allowing the parts to be pushed instead of manual lifting in combination with turning of the torso. As the details can be placed on the benches when the floor is raised, the bending act that the operators previously performed is eliminated. If Parker decides to continue developing this concept, they will have a more risk-free workspace with improved ergonomics and reduced risk of injuries.

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  • 12.
    Abrahamsson, Sten
    et al.
    Gotland University.
    Tosteby, Jonas
    University West, Department of Engineering Science, Division of Process and Product Development.
    Isaksson, Raine
    Gotland University.
    Integrated Management Systems: testing a model for integration2011In: 14th Toulon-Verona Conference: Organizational Excellence in Service. Conference Proceedings / [ed] Jacques Martin & Claudio Baccarani., Alicante: University of Alicante , 2011, p. 22-35Conference paper (Refereed)
    Abstract [en]

    Management systems are widely used for creating order, minimising risks and for assuring performance. Management systems are in many occasions integrated since this has been found to be beneficial. In this paper a model for a fully integrated management system (IMS) based on the three axes of level, extent and scope of integration is tested for relevance. The studied system permits the integration of all relevant process dimensions. The research is only in a pilot stage, but the initial results are promising and indicate that there are advantages in using the process view as a base for identifying critical aspects to be managed. A review of the current situation for system integration is studied and the model is subjected to some tests using Sweden as a case. The background study shows that system integration still is limited, especially when comparing with a fully integrated IMS. The feedback from the organisations interviewed is positive and supports continued work with development of the model.

  • 13.
    Adamsson, Kristoffer
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Analys och optimering av verktygsförslitning vid skärande bearbetning i superlegering2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In the aerospace industry today, super alloys are used in components for jet engines. To increase the efficiency of these engines, through higher combustion temperatures, new materials are developed which maintain their strength at elevated temperatures. The increase in strength as well as the ability to maintain the strength at elevated temperatures, makes them more difficult to manufacture with metal cutting technology.

    The Sector Workshop at GKN Aerospace Sweden in Trollhättan produces a large number of products with a variety of cutting tools. Some of these tools, for a certain product, have been investigated in this work. The products are manufactured from a hard-wearing superalloy which results in extremely high tool wear and high tooling costs.

    To enable improvements in the metal cutting process, a literature study was first conducted. The study focus was to identify information about the various tool wears that occur in metal cutting process of super alloys. Thereafter, specifically selected tools were analyzed. The analysis consisted primarily of a classification of the different tool wear types. In parallel with the tools being classified, measurements were made of the size of wears using a digital microscope.

    The collected data was later used for a statistical analysis, which identified the tool wear type that was the most common. The analysis showed that most of the tools had chipping. Then, to identify where in the machining process the chipping occurred further analyzes were made where the tool wear curves for two cutting tools were plotted. During this analysis to produce the tool wear curves, it was found that the chipping appeared when the tools engaged the workpiece.

    In the later parts of the work, a list of proposal was generated about how the metal cutting process could change to reduce the identified tool wears. One suggestion was to optimize the tool engagement of the workpiece. Also, an optimization of cutting data and especially the spindle speed were also recommended to reduce chipping. This due to some of the chipping could be caused by chatter vibration. For the ceramic tools an increased cutting speed was recommended because machining today was carried out at a much lower cutting speed than research results indicate is necessary for ceramic cutting tools in super alloys. Finally, a checklist for manufacturing personnel was formulated, which could be used to optimize tool wear at GKN Aerospace Sweden.

  • 14.
    Agardsson, Edvin
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Leijer, Malin
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Verktyg för identifiering av tidsåtgång för materialhantering2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Autoliv Sverige AB är ett företag som ligger i Vårgårda och tillverkar airbagar, gasgeneratorer samt elektronik till radarsystem. I framtiden finns planer för att expandera produktionen men i dagsläget vet företaget inte hur mycket resurser som går åt för materialflödet till de olika produktionslinorna. För att ta reda på hur mycket personella resurser som behövs både i befintligt materialflöde och i framtida produktionslinor vill företaget undersöka systemet som matar fram material till produktionen. För att ta fram ett verktyg som gör detta används aktionsforskning som huvudmetodik. Aktionsforskning utgör en iterativ process som består av observationer, framtagning av lösningsförslag och utvärdering av lösningsförslag. Observationerna genomfördes i samband med datainsamlingen där Kanbanrundan undersöktes, definierades och mätetal togs fram. Detta för att få en grundförståelse för vad innehållet i verktyget skulle vara.Nästa steg i processen var framtagning av lösningförslag, vilka skapades med hjälp av benchmarking av interna dokument och informationen som samlats från observationerna. En konceptmodell per person skapades och ett koncept valdes sedan ut som utgångspunkt för fortsatt utveckling av verktyget. Modellen blev sedan granskad respektive förbättrad av medlemmarna och handledaren på företaget i en iterativ process.När modellen ansågs klar verifierades det mot verkligheten och den insamlade datan. Verktyget validerades sedan genom att en anställd på Logistikavdelningen fick testa det. Utöver utvecklandet av verktyget och insamlingen av datan utfördes en benchmarking både internt på företaget och externt på ett annat företag för att studera olika materialhanteringsprocesser.I analysen diskuterades för- och nackdelar med olika val och iakttagelser som gjorts, både i arbetssättet för detta examensarbete och dess olika delar men också för materialhanterarens arbetssätt och instruktioner. Resultatet av arbetet blev ett verktyg som uppfyller de krav som formulerades i början av arbetet. Utöver verktyget upptäcktes även ett flertal förbättringsmöjligheter kring materialflödet och produktionen.

  • 15.
    Agell, Ulrica
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Robotmanipulering med Leap Motion: För små och medelstora företag2016Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    On-line programming of industrial robots is time consuming and requires experience in robot programming. Due to this fact, small and medium sized enterprises are reserved about the implementation of robots in production. Ongoing research in the field is focused on finding more intuitive interfaces and methods for programming to make the interaction with robots more natural and intuitive. This master thesis presents a method for manipulation of industrial robots utilizing an external device other than the traditional teach pendant. The base of the method is a PC application which handles the program logic and the communication between an external device and an ABB robot. The program logic is designed to be modular in order to allow customization of the method, both in terms of its functions and the type of external device that is used for the method.

    Since gestures are one of the most common forms of communication between humans, it is interesting to investigate gestures for the purpose to make manipulation of industrial robots more intuitive. Therefore, a Leap Motion controller is presented as an example of an external device which could be used as an alternative to the teach pendant. The Leap Motion controller is specialised on hand and finger position tracking with both good absolute accuracy and precision. Further, its associated Software Development Kit (SDK) has the capabilities which are required to enable implementation of a teach pendants most fundamental functionalities. Results obtained by a user test show that the developed application is both easy and fast to use but has poor robustness.

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  • 16.
    Agic, Adnan
    et al.
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. Seco Tools AB,Fagersta, Sweden.
    Gutnichenko, Oleksandr
    Division of Production and Materials Engineering, Lund University, Sweden.
    Eynian, Mahdi
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Ståhl, Jan-Eric
    Division of Production and Materials Engineering, Lund University, Sweden.
    Influence of cutting edge geometry on force build-up process in intermittent turning2016In: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 46, p. 364-367Article in journal (Refereed)
    Abstract [en]

    In the intermittent turning and milling processes, during the entry phase the cutting edges are subjected to high impact loads that can give rise to dynamical and strength issues which in general cause tool life reduction. In this study the effect of geometrical features of the cutting tool on the force generation during the entry phase is investigated. Cutting forces are measured by a stiff dynamometer at a high sampling frequency. In addition, the chip load area is analyzed and related to the measured cutting force. The results show that micro-geometrical features, in particular the protection chamfer, significantly affect the force generation during the entry phase.

  • 17.
    Agili, Uchechukwu Daniel
    University West, Department of Engineering Science, Division of Welding Technology.
    Numerical Simulation of Aluminium Butt-weld2020Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim of this study was to investigate the effect of the welding heat input on the heat affected zone (HAZ)in AA6005-T6 aluminium alloy for a butt-welded joint using gas metal arc welding by evaluating the thermal cycles, metallography and the resulting mechanical properties in the zone. This study involved using a welding experiment, numerical simulation, physical simulation and mechanical tests. The welding was carried out using the pulsed gas metal arc welding (GMAW) transfer and type J thermocouples were used to get the thermal cycles in the HAZ. Simufact® Welding was utilised for the numerical simulation. Optical microscope was used to evaluate the microstructures and Vickers microhardness test was done along the weld cross-section. The thermal cycles of thealuminium alloy and a thermal model for the experimental setup was developed. The HAZ was located on the weld cross-section with a mean hardness of 63.7HV0.1, which is considerably lower when compared with the base metal which has a hardness of 100HV0.1. This indicates thermal softening occurred due to the heat input to the material. There is a match in the hardness values of the Gleeble samples and the locations on the weld cross section suggested by the model showing validity of the simulation. This thesis work isused to assess the implications of heat input in aluminium weld joints, identify the HAZ and its mechanical properties in the design of welding process parameters for automobile parts. The Welding parameters can be optimized to reduce the amount of heat input into the weld as this will directly affect the mechanical properties int he HAZ.

  • 18.
    Agovic, Emil
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Kaltak, Aldin
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Effektivisering av packningsflöde för filter på Ultramare AB2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Nowadays companies must become more efficient with optimization of manufacturing processes and handling of goods, which often also includes the packaging process. This is when companies within the same industry compete with different strategies to become a leading company. Ultramare AB is a company that is constantly working to reduce waste to compete with others in the same industry. In order to maintain competitiveness, the company needs to improve the packaging process and as a result, the thesis work was carried out with the purpose to increase the efficiency of the packaging flow. The aim of the project was to reduce the throughput time in the packaging flow from 25 percent to 15 percent of the total factory flow. The study design used in this thesis was a case study. It is based on a data collection that was based on literature study, observations and interviews. In addition, quantitative methods were implemented, for example, time measurements of the operations in the packaging flow. The information gathered from the observations and interviews indicated that the company had two different methods of delivery with the same amount of operations. Prior to mapping the current process, time measurements were performed on all operations to increase the efficiency of the process. These time measurements were based on different customer orders for each delivery method, which made it possible to obtain all the information to streamline the current process. The method used in mapping and analyzing the flow was a value stream mapping process for each delivery method. The purpose of the value stream mapping, in this case, was to be able to distinguish the value-creating and nonvalue-creating activities clearly and easily in the current flow. By having an overview of the current state of the packaging process, various improvement suggestions could be generated. The generated improvement suggestion was screened based on the warehouse workers in the packaging department, were reduced to a number of final suggestions. These were analyzed to determine the impact and effect each suggestion had on the process. In addition, an estimated time reduction is reported when implementing the final suggestions on the current flow. To clearly visualize the estimate for each improvement suggestion, two new value stream analysis were conducted with new times and activities. The result when implementing all 14 final suggestions was that the total throughput time will be reduced by 10.25 percent.

  • 19.
    Ahlgren, Rikard
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Dörrich, Wictor
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Processutveckling av förslagsverksamheten vid GKN Aerospace Sweden2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The business world is constantly subject to intense competition that requires continuous development of products, personnel and operations within the company. The development towards a better state comes at the expense of strict requirements in job descriptions where continuous improvement is part of the working role of individuals. In order to link the continuous improvement of the business well-being, there is a need of structured work for improvement in ways of a well-functioning suggestion scheme. Suggestion schemes main purpose is to utilize the experience and knowledge of all employees by encouraging individuals' skills and creativity, which will contribute with innovative and competitive suggestions. Personnel is a resource that covers particular knowledge that no other company can copy; therefore it should be utilized to the maximum extent possible.

    The aim of the project is to identify and specify improvement measures for the suggestion scheme at GKN Aerospace Sweden AB in Trollhättan. The work consisted of an initial literature review, which included direct and indirect factors effecting the continuous improvement with linkage to the proposed suggestion scheme. In order to concretize the theoretical framework of the tools main purpose for the continuous improvement, a theoretical and a practical benchmarking was utilized. The company's current suggestion scheme was mapped and analyzed, and a foundation for future improvements was established.GKN Aerospace Sweden is part of the GKN Group, which operates in more than 30 countries around the world and employs about 50 000 individuals. The company manufactures components for aircraft and rocket engines, as well as service and maintenance. In the current situation GKN Aerospace manages a suggestion scheme that depends entirely on an internal IT system and has an average lead time of 43 weeks until a decision is made. The reward system for received suggestions is an economic reimbursement calculated through a complex formula. The entire suggestion scheme process is extensive and includes several loops for conducting the evaluation of suggestions.

    The thesis resulted in improvement propositions based on studies and situation analysis, but differs from the expected target to improve and develop the current system. The problem that arose was that the current system does not support the company's expectations for the suggestion scheme process. It resulted in a completely new system with associated procedures and reward guidelines were developed to create incentives and higher motivation for the submission of suggestions for improvement. The improvement propositions resulted in: dedicated time for improvements, group-based activities for continuous improvements, start-up meetings, new process, basis for the development of a new IT system, economic and symbolic rewards.Date: 2015-

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  • 20.
    Ahlström, Wilma
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Svanling, Lovisa
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Konkurrentanalys inom marknadsföring: Ett underlag för Parker Hannifin Manufacturing Sweden AB:s strategiska beslut och åtgärder2020Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The bachelor's thesis was carried out on behalf of Parker Hannifin Manufacturing Sweden AB in Trollhättan, manufacturer of hydraulic pumps and hydraulic motors. Parker Hannifin Manufacturing Sweden AB currently has difficulties in understanding how competitios work with social media. Therefore, the company wanted to conduct a competitor analysis to identify the gap between the companies. The purpose is to provide Parker Hannifin Manufacturing Sweden AB with an understanding of four selected competitors. The work started with information gathering to create knowledge about hydraulic motors and selected companies that make similar products. Observations of the companies' social media were made based on several parameters. Also, additional analysis tools have been used during the work, such as benchmarking and the marketing mix. The information resulted in similarities and differences that were identified, which is presented in chapter five. The marketing of Parker Hannifin Manufacturing Sweden AB's products takes place at the group level, which created problems with the work's boundaries. Difficulties in distinguishing the marketing changed the work of hydraulics piston engines to a general survey. Furthermore, strengths and weaknesses are investigated with companies' marketing on social media. The writers' views on Parker Hannifin Corporation's real competitors are discussed. The chapter Analysis and Discussion conclude with an account of three suggestions for improvement: • Create pages on social media for marketing products made in Trollhättan. • Create a Facebook group for products manufactured in Trollhättan that are linked to the Group's Facebook page. • Investigate what the customer has for expectations on the company's social media platforms. In summary, specific marketing for products manufacture by Parker in Trollhättan is difficult to identify. Furthermore, it was found that Parker Hannifin Corporation, from a marketing standpoint, mimics the competitors Bosch Rexroth AG and Danfoss Power Solutions AB. The report is an introduction to understanding the competitors and the work should continue with further development of the competitor analysis.

  • 21.
    Ahmed, Aimen
    et al.
    University West, Department of Engineering Science.
    Badr, Christian
    University West, Department of Engineering Science.
    Implementering av ett underhållssystem för produktionsprocesser: ur ett operatörsperspektiv2022Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Sansera Sweden AB produces connecting rods for diesel engines and other industrial applications. It is a part of the engine, turbine and power transmission equipment manufacturing industry. The company utilizes the IT system MaintMaster and was looking into digitize the methods used for information handling within their branch in Trollhättan. Moreover, they wanted to identify the measures that can prevent unexpected stops within their production line. The current study was conducted with the aim of further developing Sansera's maintenance system MaintMaster by digitizing instructions and checklists. The aim was to introduce digital work instructions that could be presented with smart technologies. This development would simplify the work of the operators and maintenance staff and expand the practice of the system to support preventive maintenance. To identify the cause of unexpected stops, the data were collected through interviews and observations. The interviews identified four cases that formed the basis for the results. Based on the data collection, it could be noticed that the preventive maintenance measures that were carried out did not include an efficient follow-up task.

    Daily supervision controls were not documented anywhere, and weekly supervision was documented by paper. Deviations could therefore not be controlled or tracked in an appropriate way, which eliminated an advantageous follow-up measure. Within the current degree project, the company's supervisory controls were digitized and based on the digital checklists, an overview portal was developed for the responsible operator to check and track deviations that are identified. To further support the preventive maintenance, instructions were digitized by developing an interface that is easily accessible. This was done due to instructions were only available via paper lists in binders. To streamline the work of operators, a digital 5S inspection was developed where each shift is to be granted that the workplace is left in a way that facilitates the work of upcoming work shifts. Furthermore, the availability of the component sheet used for tool changes was also streamlined. Tool changes is a recurring process that the operators perform every shift, when performing tool changes there is a need for a document with article number for all spare parts that the operator needs. The observations showed a low availability of documents, which led to non-value-creating time in the form of time waste. The documents for the tool changes were digitized and linked to QR-codes, which meant that operators only needed to go to the spare parts collection cabinet and scan a QR-code to gain access to the item numbers. 

  • 22.
    Alagic, Almira
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Balint, Norbert
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Marknadsanpassning av kabelskopa2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

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

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

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

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

  • 23.
    Albayat, Mohammed
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Förebyggande Underhåll för en batteriåtervinnningsfabrik2022Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Rapporten som redovisas här är ett examensarbete med uppdrag att genomföra förebyggande underhåll i kross- och separationsavdelningen på en batteriåtervinning fabrik. Fabriken återvinner litiumjonbatterier som används i elbilar. I kross- och separationsavdelningen är det mycket buller och damm som en följd av skakande och krossande processerna i den mekaniska separationen. Det är tunga maskiner som genom olika operationer sliter isär metallkomponenterna i batteriet till mindre delar för att slutligen mala dem och separera beståndsdelarna i materialet åt med avseende på deras magnetiska egenskaper. Förutsättningar i kross och separationsavdelningen medför ohälsosam miljö för människor, vilket leder till att avdelningen måste styras automatiskt utan att medarbetare behöver befinna sig i avdelningen. Det föreslagna förebyggande underhållssystemet som behandlas i rapporten stöds av teknik från Industri 4.0. Industri 4.0 är benämningen på en rad moderna teknologier och koncept som används inom automation. Maskin-till-Maskin kommunikation och Internet of things(IoT) är integrerade för högre grad av automation. Förebyggande underhållsarbetet som presenteras baseras på en förstudie analys som nischar sig inom förebyggande underhåll och industri 4.0. Förebyggande Underhållsarbetet som redovisas i denna rapport kommer inkludera ett signalflödesschema som ska visualisera kommunikationen mellan enheterna i avdelningen,en schematisk design för övervakningssystem, ventilationen och ett underhållsschema för maskinerna i avdelningen

  • 24.
    Alfredsson, Jonas
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Framtagning av kravspecifikation och affärsmodell för fjärrdiagnostisering av lyftlösning2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

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

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

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

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

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  • 25.
    Algenaid, Wael
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Erosion behaviour of suspension plasma sprayed thermal barrier coatings2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Thermal barrier coatings (TBCs) are applied on the surface of hot parts of gas turbine engines to increase the turbine efficiency by providing thermal insulation and also to protect the engine parts from the harsh environment. To maximize these benefits, the TBC must remain intact to the underlying metallic gas turbine components through the life of the gas turbine engines. Typical degradation of TBCs can be attributed to bond coat oxidation, thermal stress etc. In addition to this, erosion can also lead to partial or complete removal of the TBCs especially when the engine operates under erosive environment such as flying over desert area, near active volcanic or offshore ocean environment. Therefore, erosion is also acknowl-edged as a significant life-limiting factor for TBCs. Suspension plasma spray (SPS) is a rela-tively new technique capable of producing coatings with lamellar/vertically cracked and co-lumnar microstructures. Moreover, SPS is a cheaper process compared with Electron Beam Physical Vapor Deposition (EB-PVD) which is a well-known commercial technique to produce columnar TBCs. This work aims to study the effect of microstructure produced by SPS on the erosion performance of TBCs. Six different suspensions of 8 wt. % Yttria Stabilized Zirconia (YSZ) ceramic powder with distinct suspension characteristics such as solid load, solvent type and particle size distribution were used to spray six different TBCs using an identical bond coat and substrate. The as-sprayed TBCs were subjected to an air jet erosion test at room temperature, and their erosion resistance was compared. It was found that the total porosity content in the coating was the most predominant factor influencing the erosion performance of the coatings. Moreover, vertically cracked coatings resulted in low total po-rosity which in turn lead to high erosion resistance. This result was also supported by one of the columnar coatings which had the lowest porosity and highest erosion resistance as com-pared to other columnar coatings. Therefore, it is recommended to produce a columnar coating with lower porosity content for SPS TBCs.

  • 26.
    Ali, Saadat
    University West, Department of Engineering Science.
    Characterization of laser powder bed fusion process for alloy Haynes 2822022Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Additive manufacturing has played an important role in revolutionizing the manufacturing industry by providing expedited processes to manufacture the products with low cost, high production efficiency, and building complex part using fewer resources. Laser powder bedfusion (LPBF) is one of the additive manufacturing processes applicable for widespread materials and holds variable parameters to be set depending on the material required for the best possible product properties outcome. Haynes 282, a recent discovery, exhibited its extraordinary thermo-mechanical properties and was readily developed for high-temperature structures on an industrial scale. The development of Haynes 282 products with laser powder bed fusion (LPBF) process, needed to be investigated for the desired product properties withvarying process parameter combinations. With this process and unique parametric combination for each sample, a total of 24 samples for Haynes 282 were produced. These variable combinations of parameters for the process allowed us to find the optimized parameters leading to desired product properties. These samples were investigated under a microscope and characterized for their defects and melt pool study studies. Each sample exhibited aunique defect pattern and melt pool build, upon which the parameters were assessed and optimized. A comparison was built between the samples exhibiting extreme characterization values to evaluate the behaviour of the parameters affecting these values and extract the optimized parameters for an effective desired sample build with minimal defects while establishing a consolidated correlation between the parameters and the observed output.

  • 27.
    Alizadeh-Khameneh, Mohammad Amin
    et al.
    KTH Royal Institute of Technology, Division of Geodesy and Satellite Positioning, Stockholm, Sweden.
    Eshagh, Mehdi
    University West, Department of Engineering Science, Division of Mathematics, Computer and Surveying Engineering.
    Jensen, Anna O.
    KTH Royal Institute of Technology, Division of Geodesy and Satellite Positioning, Stockholm, Sweden.
    Optimization of deformation monitoring networks using finite element strain analysis2018In: Journal of Applied Geodesy, ISSN 1862-9016, E-ISSN 1862-9024, Vol. 2, no 2, p. 187-197Article in journal (Refereed)
    Abstract [en]

    An optimal design of a geodetic network can fulfill the requested precision and reliability of the network, and decrease the expenses of its execution by removing unnecessary observations. The role of an optimal design is highlighted in deformation monitoring network due to the repeatability of these networks. The core design problem is how to define precision and reliability criteria. This paper proposes a solution, where the precision criterion is defined based on the precision of deformation parameters, i. e. precision of strain and differential rotations. A strain analysis can be performed to obtain some information about the possible deformation of a deformable object. In this study, we split an area into a number of three-dimensional finite elements with the help of the Delaunay triangulation and performed the strain analysis on each element. According to the obtained precision of deformation parameters in each element, the precision criterion of displacement detection at each network point is then determined. The developed criterion is implemented to optimize the observations from the Global Positioning System (GPS) in Skåne monitoring network in Sweden. The network was established in 1989 and straddled the Tornquist zone, which is one of the most active faults in southern Sweden. The numerical results show that 17 out of all 21 possible GPS baseline observations are sufficient to detect minimum 3 mm displacement at each network point. © 2018 Walter de Gruyter GmbH, Berlin/Boston.

  • 28.
    Aljaghsi, Ahmad
    University West, Department of Engineering Science.
    The use of Discrete Event Simulation to increase the production efficiency of a Sawmill2023Independent thesis Advanced level (degree of Master (One Year)), 20 HE creditsStudent thesis
    Abstract [en]

    This research was created in partnership with Södra an organization in the forest industry that owns 8 sawmills in Sweden. The aim of the research comes from the idea that many sawmill industries are traditional companies with modernizing aspirations. The development of more efficient, demand-driven, industrialized, computerized, and automated production is a challenge for the wood industry sector. Simulation has long been used as a basis and support in many businesses when critical decisions and adjustments must be made.  

    Discrete Event Simulation (DES) is one of the technologies that have not been implemented at the same level in other industries. This research aims to improve the efficiency of production at the sawmill. To achieve this purpose, a plant simulation program has been constructed a Discrete Event Simulation (DES) model that can mimic the Södra sawmill. To improve production efficiency, different scenarios have been applied to the model.  

    One of the most significant parts of using simulations is that the model developed duplicates the real system, which has been accomplished since the model matches the reality with an error percentage of 1.59 %. Proposed scenarios to increase the production at the sawmill had been simulated.  

    A checklist that provides a step-by-step explanation of how the study fulfils the purpose and answers the research question has been presented in Chapter 4. Using accurate input data in plant simulation assisted in obtaining an accurate output, which means that if the data obtained is sufficient for use in a plant simulation, the model can be used to analyse any industry and improve production or, for example, cut working hours, and so on. The research question for this study is, "How can the efficiency of the sawmill's production line be increased?" The first scenario involves adding one more shift to all sawmill stations except the saw station and the dryers, which increases production output by 23.6%. The second scenario involves adding one more shift to all stations, including the saw station, which results in a 28.5% increase in output efficiency. Using those two situations, the subject of this study's investigation was satisfactorily answered, and the efficiency of the production flow was increased.

  • 29.
    Alkar, Abbas
    et al.
    University West, Department of Engineering Science.
    Alkhalifeh, Nael
    University West, Department of Engineering Science.
    Robotflexibilitet i smarta lager2023Independent thesis Basic level (professional degree), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    The use of robots in smart warehouses is becoming increasingly common as businesses look for ways to improve efficiency and productivity. However, the flexibility of robots is often limited by their programming and design. This can make it difficult for them to adapt to changing tasks and environments, which can lead to inefficiencies and additional costs.

    This thesis aims to assess and compare the performance and adaptability of different types of logistics robots used by three companies: Essity, Toyota Material Handling, and Still Sweden. Logistics robots are designed to perform specific tasks in smart warehouses, such as picking, packing, sorting, and transporting goods. However, their lack of flexibility can limit their efficiency and usefulness when faced with changing tasks and environments. Therefore, this thesis seeks to examine how the capabilities and functions of logistics robots affect their ability to cope with various warehouse scenarios and to propose ways to optimize their movement patterns and enable multitasking and adaptability.

    The project will employ a mixed-methods approach consisting of a literature review and a case study analysis based on interviews with the three companies.

    The expected outcomes of the project are to provide a comprehensive overview of the current state of the art in logistics robot adaptability, to identify the technical and organizational challenges and benefits of using more flexible robots in smart warehouses, and to offer recommendations for improving the efficiency and productivity of warehouse operations with more adaptable robots.

  • 30.
    Allgurén, Olivia
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Patama, Sanna
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Securing the just-in-time delivery for the after-market: Study at Volvo car customer service2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The thesis has been performed at Volvo Car Customer Service in Gothenburg, Sweden. The output from the study will support Volvo to secure the Just-In-Time delivery of referrals for the after-market. The scope was limited to referrals from pre-planned orders, which occurs when there is no availability in the distribution centre where the orders were placed.

    Volvo's main warehouse in Europe is the Central Distribution Centre, which process referrals. The warehouse had an ongoing organisational change during this study. The concern was that the change would not lead to optimal conditions for processing referrals for different markets. It was therefore important to preserve the market knowledge in order to maintain a reliable referral service.

    A qualitative study was used and the information was gathered primarily through semi-structured interviews. Literature was studied both initially and continuously through the study. Analyse of the literature, current situation and data collection generated ideas for possible ways of securing the referral process and improvements. Benchmarking and Workshop was also performed in order to obtain further ideas.

    The result of this study was an information material containing information about all concerned markets, overview of referral flow and information regarding how the Central Distribution Centre needs to print referrals. The proposals suggested for future work were explained in long- and short-term. The short-term suggestions include use of the developed material in order to preserve the knowledge along with providing correct working conditions. For long-term suggestions focus has been on how to reduce or remove the printing problem. For future work Volvo Car Customer Service should consider these proposals in order to secure and improve the referral service.

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  • 31.
    Almhage, Tim
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Nyström, Robin
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Utmaningar samt förbättringsförslag vid implementering av ett simuleringsverktyg2021Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim of the degree project was to develop and map challenges and improvement proposals in the implementation of a simulation tool. The simulation tool that was to be implemented is used to reduce costs in logistics and is already available in other factories in the Group. The simulation tool was not directly transferable as the information base used to build the tool differs from the base of other factories. The difference was, among other things that different articles were used and the layout of the factories was not the same. Even though the data could not be used directly, the work was facilitated by the opportunity to consult how other factories went about implementation. This case study describes what an implementation of a simulation tool can look like. To help with the work, several methods and theory for continuous improvement will be presented. Much of the information gathered has been gathered trough meetings, interviews and tours of the factory to be able to understand how it is structured and how different elementsworked. The case study further describes that previous implementation attempts have failed and why the possibilities are greater in this implementation attempt. The work resulted in several challenges as well as improvement proposals that are analyzed in the case study. It was concluded that the opportunities to be able to improve operations when implementing a simulation tool were great and that these conclusions can be used inthe next implementation work. The three improvement proposals presented in the case study are to create a library, a living flow chart with a responsible improvement team and to sell improvement proposals before start-up.

  • 32.
    Alsaleh, Abdlkarim
    University West, Department of Engineering Science, Division of Production Systems.
    Applying digital twin technology in education and research: A case study of PTC automation line2021Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis work investigates the possibilities and limitations of using digital twin technology to create virtual automation lines which can be used in education and research to conduct automation labs virtually. The PTC automation line at University West has been used as a case study in this thesis. The digital twin created in this work consists of three key parts: a virtual model of the automation line created in Visual Components Premium 4.2, system control (PLC-control program) created in TwinCat 3, and a Beckhoff ADS communication protocol that connects the virtual model with the PLC program.

    Using a virtual model of industrial-like lab equipment in place of a real system can bring several benefits. It can increase visibility and safety in the system. It can also increase the accessibility of the system. Conducting virtual labs and experiments can also help in reducing the total cost of the system. The virtual twin of the automation line built in this work can be used to help the users to conduct automation labs and experiments virtually and to test their PLC programs offline.

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  • 33.
    Alsing, Linda
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Johansson Storm, Sandra
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Sustainability of Additive Manufacturing: Electron Beam Melting of IN7182019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this thesis is to examine and describe the process of Additive Manufacturing (AM) and the energy use in the production of parts manufactured with the Electron Beam Melting (EBM) technology in particular IN718, which is a Nickel-based superalloy with specification according to UNS n07718 that is used in the aerospace industry. The objectives also include a brief overview of powder bed AM methods and a sustainability analysis. Consequently, this thesis will examine both energy use and the CO2-footprint for the EBM with IN718. The result of this thesis will be used in the SuMan-Next project at the Centre for Production Research, PTC, in Trollhättan where University West conducts research in materials for the Aerospace industry. AM is currently a rapidly expanding area of manufacturing. This process adds the material layer-by-layer, which results in a design freedom and flexibility that is almost impossible for traditional subtracting manufacturing. To examine the energy use, measurements with an electrical network analyzer was performed on the EBM while two different geometries was manufactured. After these measurements, the data was collected and the energy use for the build could be calculated. By doing that, the CO2 footprint for the build could be estimated. A study visit to the AM division of Sandvik Machining Solutions in Sandviken was conducted to observe, investigate and learn more about atomization of metal powder. A small Life-Cycle-Inventory was conducted and the production process could be assessed, to establish the CO2 footprint from material extraction to product. When it comes to CO2 footprint, it is definitely the production of the material before atomization that gives the most CO2 footprint, this thesis can establish that the geometry does matter for the build part and that in these conducted studies it is with a factor 2. However, compared to manufacturing of the powder or/and the build, the bulk material production gives 5-50 times more CO2footprint than the rest of the process. If using more recycled material in the metallurgy instead of virgin, the CO2 footprint will decrease significantly. Recycled material is good to decrease the energy use and CO2 footprint, but also to decrease the mining of the critical elements that are included in the alloys.

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  • 34.
    Alves Powell, Todd
    et al.
    University West, Department of Engineering Science.
    Andersson, Alex
    University West, Department of Engineering Science.
    Utveckling av system för dämpning och montering av ergonomistol inom privatbåtsmarknaden2023Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [sv]

    Under de senaste åren har Quokka AB utvecklat en sätesgeometri som har validerats för att vara ergonomisk och ge stöd för användaren. Målet med detta arbete var att hitta och utveckla innovativa lösningar på ett dämpningssystem som kan kombineras med sätesgeometrin och appliceras i planande båtar inom privatbåtsmarknaden. 

    Arbetet startade med en problemformulering som utformades via samtal med uppdragsgivaren. En produktutvecklingsprocess initierades där problembeskrivningen låg till grund för hela processen. I processen genererades och utvärderades koncept med brainstorming, specifikationer och Design Thinking som metodik. Med hållfasthetsberäkning och CAD-modellering framställdes en systemkonstruktion som validerades med simulering. Utifrån systemkonstruktionen skapades en detaljkonstruktion och en mindre 3D-utskriven skalenlig prototyp av systemet.

    Projektet resulterade i framtagandet av en innovativ lösning för att motstå vibrationer och mekaniska stötar genom utnyttjande av materialens elastiska egenskaper och hydrauliska dämpare. Det valda systemet skapades med robusta material, såsom förstärkt glasfiber och rostfritt stål, för att uppfylla de höga krav som ställs inom den marina industrin för korrosionsbeständighet och hållfasthet.

    Det slutliga systemet har validerats för att fungera i teorin, dock behöver konceptet utvärderas i en marin miljö med en fullskalig prototyp. Det krävs även att klämrisken i systemet elimineras helt och att produktionskostnaden reduceras med ett fokus på att minska vikten för att det slutgiltiga målet för produkten ska nås.

  • 35.
    Alvi, Sajid
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Luleå, Sweden.
    Neikter, Magnus
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. Luleå University of Technology, Department of Engineering Sciences and Mathematics, Luleå, Sweden.
    Antti, Marta -Lena
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Luleå, Sweden.
    Akhtar, Farid
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Luleå, Sweden.
    Tribological performance of Ti6Al4V at elevated temperatures fabricated by electron beam powder bed fusion2021In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 153, article id 106658Article in journal (Refereed)
    Abstract [en]

    Electron beam powder bed fusion (EBPBF) is a beneficial processing route to fabricate Ti6Al4V alloy for aerospace applications due to its relatively low lead time and the possibility of topology optimization. The dry sliding wear behavior of EBPBF-Ti6Al4V against steel- and alumina-counterballs from room temperature (RT) to 500 °C was investigated to evaluate the influence of EBPBF processing and microstructure on the wear properties for broadening the application criteria of this lightweight alloy. The wear tests revealed that the wear rate decreased with increasing temperature due to formation of stable oxide glaze layer. This study reveals elevated temperature sliding wear behavior, wear mechanisms and microstructural changes below the wear track of EBPBF Ti6Al4V alloy against steel and alumina counterbodies. 

  • 36.
    Alwaeli, Laith
    University West, Department of Engineering Science, Division of Mechanical Engineering.
    Sjukvårdens behov av kurser inom verksamhetsutveckling2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
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    fulltext
  • 37.
    Ameh, Augustine Omale
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Upscaling of Textile Sorting / Recycling Facility: At Wargön Innovation Demo Facility2021Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Sustainability in consumer generated textile waste and disposal practices is a concern due to the raw materials requirements and its impact to the environment. With the Swedish government set to implement the 'Extended Producer Responsibility' legislation for textiles due to these concerns, textile sorting / recycling facilities are critical to achieve improved end-of-life consumer textile recycling. For profitability, the textile sorting / recycling operations have to be done at a scale that optimizes the opportunities. This thesis work investigates the current state and challenges of textile sorting in Sweden and researches solutions towards the scaling-up or capacity expansion of the existing textile sorting facility at Wargön Innovation from 500 tons/year to 1000 tons/year as well as application of lean manufacturing methodologies in optimisation while creating value within the supply chain. To fully grasp the situationat Wargön Innovation, detailed interviews, observations, process and equipment trails were conducted. Based on the current state, a layout was developed and sorting process flow created as well as a spaghetti diagram. Also, 3D modelling and process simulation of the sorting was carried out using Visual Components software to develop simple and yet visually powerful designs that validated the proffered solutions. To scale-up, it was established that air-throwers will need to be installed for sorted textile diversion to allow for higher sorting rates. Solutions towards improving the sorting process and value chain at Wargön Innovation was also proffered and recommendations included post-consumer textiles segregation at source, customer/suppliers diversification etc. For recommended further works, the area of automation of the manual pre-sorting process to eliminate manual handling will be another area of interest for which continued work is suggested.

  • 38.
    Anderberg, Staffan
    University West, Department of Engineering Science, Division of Production Engineering.
    A study of process planning for metal cutting2009Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Process planning as a function for competitiveness is often neglected. However, as an intermediary between product development and manufacturing, it holds a key function in transforming product specifications and requirements into a producible process plan. Demands and requirements should be met concurrently as manufacturing costs and lead times are minimised. The focus of this thesis is the act of process planning, where the use of better methodologies, computer-aids and performance measurements are essential parts. Since process planning has the function of transforming demands and requirements, changing customer and regulative requirements are vital to regard. Since environmentally benign products and production increases in importance, the research presented in this thesis includes a CNC machining cost model, which relates machining costs to energy consumption.  The presented results in this thesis are based on quantitative and qualitative studies in the metal working industry.

     

    This thesis has contributed to an enhanced understanding of process planning to achieve better performance and important areas for improvements. Despite a 50 year history of computerised process planning aids, few of these are used in the industry, where manual process planning activities are more common. Process planning aids should be developed around the process planner so that non-value adding activities, such as information management and documentation are minimised in order to allow more resources for value adding activities, such as decision making. This thesis presents a study of systematic process planning in relation to perceived efficiency. This correlation could however not be verified, which opens up for further studies of other possible explanations for process planning efficiency. Process planning improvements in the industry are difficult to make, since there is little focus on process planning activities and limited knowledge about actual performance hereof. This means that measures taken regarding process planning development are difficult to verify.

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    A_study_of_process_planning_for_metal_cutting_Staffan_Anderberg
  • 39.
    Anderberg, Staffan
    University West, Department of Engineering Science, Division of Process and Product Development.
    Methods for improving performance of process planning for CNC machining: an approach based on surveys and analytical models2012Doctoral thesis, monograph (Other academic)
    Abstract [en]

    Process planning as an enabler of competiveness is often overlooked, but being one of the principal function in the product realisation flow it holds a key role by combining both product and production requirements into a production concept with respect to the current manufacturing system. As such the capability of process planning to a large extent dictates production cost, lead times, product quality etc. With the introduction of new demands on production, such as environmental impact and process capability, process planning must be able to manage these demands effectively. Accordingly, it is vital to study the effects that up-coming demands have on the act of process planning. The research methods employed in this work include surveys (questionnaires and interviews), industrial case studies and experiments to provide data for models developed. The main finding of this research is that there is a lack of quantified process planning performance knowledge in the industry, which leads to verification problems as to whether changes that are made render anticipated effects. Results of surveys also indicated a low level of digitalisation of product data and limited use of computer aids (CAM, feature-based CAM and PLM) in Swedish industry based on 144 companies' response. A concept to improve process planning performance through operation classification based on process capability indices (Cp/Cpk) was suggested. The role of process planning in designing cost efficient and energy efficient machining operations has been maintained throughout the thesis by showing how tool selection and machining parameters selection influences the possibilities to achieve these objectives. This work has also showed that no inherent contradictions appear to exist between achieving cost efficient and energy efficient machining operations. This thesis has contributed to an enhanced understanding of how process planning improvements can be achieved through a holistic perspective of the process planning function, where both technical and methodological aids are included. It is however essential to understand the current situation of the process planning organisation, its internal/external relations, level of digitalisation, competency level etc. before major changes of the process planning function are undertaken in order to be successful.

  • 40.
    Anderberg, Staffan
    et al.
    University West, Department of Engineering Science, Division of Production Engineering.
    Beno, Tomas
    University West, Department of Engineering Science, Division of Production Engineering. University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Pejryd, Lars
    3Production Technology Centre, Innovatum AB.
    A survey of metal working companies’ readiness for process planning performance measurements2009In: IEEE International Conference on Industrial Engineering and Engineering Management, IEEM 8-11 sep, 2009, Hong-Kong, 2009, p. 1910-1914Conference paper (Refereed)
    Abstract [en]

    The paper presents an investigation regarding the potential and the readiness for implementing performance indicators and performance measurement systems of the process planning work for metal working companies. The paper is based on a questionnaire survey distributed to process planners in the Swedish metal working industry. The main outcome of the investigation is a foundation for understanding the implementation of performance measures of the process planning work for CNC machining. The survey revealed a few strengths and short comings in the studied companies.

  • 41.
    Anderberg, Staffan
    et al.
    University West, Department of Engineering Science, Division of Production Engineering.
    Beno, Tomas
    University West, Department of Engineering Science, Division of Production Engineering. University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Pejryd, Lars
    Production Technology Centre, Innovatum AB.
    CNC machining process planning productivity – a qualitative survey2009In: Proceedings of The International 3'rd Swedish Production Symposium, SPS 09, 2009, p. 228-235Conference paper (Refereed)
    Abstract [en]

    Process planning is the link between design and manufacturing and consequently an important function, since it influences many of the company objectives. However, many companies have little knowledge about their process planning function and the efficiency is thus not optimal. The paper focuses on the automation level of process planning as a mean to improve process planning efficiency. Six CNC machining companies was interviewed and accordingly analysed through a five dimensional automation level model to understand their process planning work. The main findings are that the automation level is low and concurrent engineering is lacking in many of the investigated companies.

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    Anderberg_Beno_Pejryd_CNC machining process planning productivity - a qualitative survey
  • 42.
    Anderberg, Staffan
    et al.
    University West, Department of Engineering Science, Division of Production Engineering.
    Beno, Tomas
    University West, Department of Engineering Science, Division of Production Engineering. University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Pejryd, Lars
    University West, Department of Engineering Science, Division of Production Engineering.
    Process planning for cnc machining of swedish subcontractors: A web survey2014In: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 17, p. 732-737Article in journal (Refereed)
    Abstract [en]

    Process planning of CNC machining is critical to ensure cost, time and quality parameters of manufacturing operations. At the heart of process planning is, typically the process planner, who must make a multitude of decisions regarding machines, cutting strategies, tools and process parameters etc. Today there are a number of different tools and methods available to aid the process planner. This paper explores today’s industrial use of some of these aids and outlinespotential underlying reasons for the current state. The empirical data is based on a questionnaire survey of Swedish CNC machining sub-contractors. The main conclusion is that despite a long history of development of various aids (CAD/CAM, PLM standards etc.) there is still a large proportion of the industry, which has not yet adopted these aids. By the responding companies 32% do not use any CAM system and only 2% use a PLM system. On the other side of the spectrum is a group of 25% that uses CAM in 75% or more of their planned products. The learning from this survey can be used to better understand the industrial needs and focus research and development efforts.

  • 43.
    Anderberg, Staffan
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Beno, Tomas
    University West, Department of Engineering Science, Division of Production Engineering. University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Pejryd, Lars
    University West, Department of Engineering Science, Division of Production Engineering.
    Production preparation methodology in Swedish metal working industry - a State of the Art investigation2008In: Swedish Production Symposium, Stockholm 18-20 November 2008. Proceedings: The Swedish Production Academy's annual conference / [ed] Bengt Lindberg och Johan Stahre, Stockholm: The Swedish Production Academy , 2008, p. 443-450Conference paper (Other academic)
    Abstract [en]

    This article presents a brief state of the art in the Swedish metal working industry regarding the production preparation process for the machine centre. The article is based on a relationship model from which a questionnaire was developed. The model incorporates the perceived preparation process efficiency, the amount of systematic preparation work, in relation to the companies’ premises as possible causes. The investigation is based on a general hypothesis that a more systematic approach in the preparation process leads to higher preparation process efficiency. This hypothesis was supplemented by two more hypotheses and additional analyses to create an understanding of the situation. The main finding in this investigation is that there appear to be no relationship between increased  ystematic preparation work and perception of higher preparation efficiency. The investigation also indicates that many metal working companies have little knowledge about the performance of their preparation process and that there is an efficiency improvement potential of nearly 30%.

    Download full text (pdf)
    Anderberg_Beno_Pejryd - Preparation Methodology in Swedish metal working industry
  • 44.
    Anderberg, Staffan
    et al.
    University West, Department of Engineering Science, Division of Production Engineering.
    Kara, Sami
    University of New South Wales.
    Energy and cost efficiency in CNC machining2009In: The 7th CIRP Conference on Sustainable Manufacturing: Chennai, India, December 2-4, 2009., 2009Conference paper (Refereed)
    Abstract [en]

    General cost for CNC machining and the associated energy cost are set in the context of making economic and environmental improvements. This creates an incentive for manufacturing companies to investigate the energy efficiency of manufacturing processes. The paper presents a costing model, based on machining experiments. The model is accompanied with an industry based case to estimate the cost savings. The results show that substantial cost savings with respect to energy efficiency is unlikely, since energy costs in CNC machining comprises a small cost component. However significant cost savings can be achieved if the production output is increased as a consequence from higher material removal rates due to optimised machining parameters.

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    Anderberg_Kara - Energy and cost efficiency in CNC machining
  • 45.
    Anderberg, Staffan
    et al.
    University West, Department of Engineering Science, Division of Production Engineering.
    Kara, Sami
    University of New South Wales.
    Beno, Tomas
    University West, Department of Engineering Science, Division of Production Engineering. University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Impact of energy efficiency on computernumerically controlled machining2010In: Proceedings of the Institution of mechanical engineers. Part B, journal of engineering manufacture, ISSN 0954-4054, E-ISSN 2041-2975, Vol. 224, no B4, p. 531-541Article in journal (Refereed)
    Abstract [en]

    Increasing environmental demands from governmental bodies and customers stress the importance of companies improving their environmental performance. The research presented here shows that productivity and cost efficiency improvements can be achieved alongside energy savings in a computer numerically controlled machining environment. This improves the profitability of the companies, but also leads them towards more sustainable and environmentally aware manufacturing; the relationship between machining parameters, machining costs, and energy consumption is evaluated. From this perspective, it is important that production planners etc. understand the methodological possibilities for improvements in cost and energy efficiency. The current research is based on a machining cost model and experiments where energy consumption and tool wear were monitored.

  • 46.
    Andersson, Daniel
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Design of a high precision and highdamping joint2014Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The objective of this thesis was to design a joint that combines high precision and high damping. A possible application for the joint is to reduce vibrations in machine tools or workpieces during metal cutting processes. The goal was that the joint would clamp a test steel beam with the maximum repeatable referencing precision of 0,05 mm and increase the dynamic stiffness in the beam by 200 %. The increase in dynamic stiffness should also be achieved with less than 20 % reduction in static stiffness in the beam. Five different joint types were evaluated from which pinned joint was selected. Damping is accomplished by incorporating a thin layer of viscoelastic material in the joining surfaces and three pins are used for precision alignment between the surfaces.

    The joint was tested with the finite element method to evaluate the damping property before it was manufactured. After manufacturing, an experimental modal test was performed using an impact hammer to evaluate the damping capability. The precision of the joint was measured in a CNC machine. Experiments showed that the repeatable referencing precision of the joint is inside 0,05 mm. The dynamic stiffness in the beam is increased by 180 % with 23 % decrease in static stiffness. 

  • 47.
    Andersson, Daniel
    University West, Department of Engineering Science.
    The performance of an iced aircraft wing2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The goal of this thesis work has been to develop and manufacture an ice layer which was to be mounted on the tip of a scaled down wing model. The iced wing should be tested in a wind tunnel and aerodynamic comparisons should be made to the same wing without ice.The development of the ice was carried out as a modified product development process. The main differences are that there is no costumer and that the actual shape and functions of the product are more or less predetermined. The challenge was to find the best way to create the ice layer and how to mount it to the wing without damaging it or covering any pressure sensors. Product development methods such as pros and cons lists and prototypes were used to solve problems before printing the plastic ice layer in a rapid prototyping machine.Wind tunnel experiments were then conducted on the wing with and without the manufactured ice. Raw data from the wind tunnel were processed and lift and drag coefficients were calculated using mathematical equations. Finally, conclusions were drawn by comparing the results from the wind tunnel tests with theory, other works as well as CFD simulations.The ice layer was successfully manufactured and it met the target specifications. The aerodynamic performance of an iced aircraft wing proved to be considerably worse compared to a blank wing. The maximum achievable lift force decreased by 22% and an increased drag force will require more thrust from the airplane.

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    The performance of an iced aircraft wing
  • 48.
    Andersson, Ida
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Analysis and Process improvements of Volvo Penta's process for supplier related warranty issues: with focus on the Purchasing department2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Volvo Penta is a worldwide company that provides power solutions all over the world. They aim to be the most forward thinking and customer focused supplier of sustainable power solutions. The company's core values are Quality, Safety and Environmental care.

    Volvo Penta works with quality issues found by customers in the field. The current Quality Journal (QJ) process is perceived to be slow and inefficient. For Volvo Group customer focus is important and field complaints are both expensive and damaging to the brand. The approach method to solve a QJ is the eight discipline of problem solving.

    This thesis aimed to find where in the process time is wasted and reduce the throughput time for the QJ process. To achieve this the thesis, a Case Study has been the approached methodology. A Case Study's purpose is to gain a deeper knowledge of a subject. The methods that were used to gain deeper knowledge for the subject were semi- and open interviews, workshop and internal documents and data. To secure validity and reliability of the thesis different perspectives have been taken into consideration for each method.

    The theoretical framework for this thesis has also been used to ensure validity for the study. The choice of theoretical framework for this study has been founded on Lean manufacturing tools, Agile project methods, flow within processes and group dynamics.

    DMAIC has been the structure for this thesis. DMAIC is a method that can be used to improve upon a process. It stands for Define, Measure, Analyze, Improve and Control. The method states that to improve a process there must first be a process.

    The workshops purpose was to conduct a process- and value stream map as well as to find potential causes to why the process was perceived to be too slow. It was conducted with a cross-functional team that previously had worked in a QJ case.

    The interviews conducted for this thesis were approached in a semi-structured and opened way. This generated a lot of information that needed to be reviewed. 

    The data was to be used to find statistical and measurable conditions for the thesis. This was however not possible. The obtained data was deemed unreliable to make any conclusion from.

    The internal documents provided to this thesis have helped to get a general knowledge of how the QJ process is supposed to work. However, a lot of self-made documents have been received. They have been deemed to be unusable for this thesis since they are conducted on subjective facts. No documentation obtaining work instructions for each department has been received for this thesis.

    All methods generated potential causes to why the process did not achieve its purpose. They have been conducted in an Ishikawa cause-and-effect chart. With each approach method potential causes listed could be discarded. Eventually there were four causes left that were identified as the root causes to the problem. There was no standardized approach to QJs, lack of well formulated Key Performance Index (KPI), lack of communication tools and inefficient teams.  

    The result of the thesis is that the fundamental preconditions for improving a process were missing. It was found that there was no use to improve upon the existing QJ process, since no evident facts could be obtained that assure that the improvements would make the process more efficient.

    This thesis suggests assigning a cross-functional pilot QJ team. They will put all their focus on solving QJs and start to establish a standardized process. Making a structural change within the organization, which this thesis proposes, takes time. Full support in the entire organization is needed for this improvement to succeed. 

  • 49.
    Andersson, Johan
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    A computational geometry method for centrifugal compressor impellers2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Modern centrifugal compressor impeller geometry often consist of curves and surfaces with a high degree of three dimensionality. This makes the geometry of the impeller difficult to model with commercial CAD-tools. Additionally, in modern optimization processes of impellers the geometry is commonly altered, this puts high demands on the method that is used for generating the geometry. In this work a new computational geometry method for centrifugal compressor impellers is compiled. The new method is designed to be flexible and to support present day optimization processes.The new method is a compilation based upon publications regarding impeller geometry and impeller optimization. It utilizes Bezier curves and B-splines to generate geometry and supports optimization by allowing control points of the constructing curves to be relocated to change the shape of the geometry. To test the new method, a standalone application was successfully developed with the aid of the SCRUM development process. With an easy to use graphical user interface the application generates and displays a 3D model of the geometry generated with the new method.

  • 50.
    Andersson, Johan
    University West, Department of Engineering Science, Division of Production Engineering.
    Utvärdering och förbättring gällande Volvo Aeros tillämpning av metodiken praktisk problemlösning2012Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Volvo Aero develops, designs, manufactures and performs maintenance of engine and related components for civil and military aircrafts. The vision is to deliver world-leading transport solutions through continuous improvement and long term business deployment, which for the daily work means systematic problem solving through the methodology practical problem solving, whose origin is Toyota.

    The purpose of this thesis was to examine whether Volvo Aero’s approach of practical problem solving was simple, systematic and guided, which from Toyota’s point of view creates sound conditions for effective problem solving.

    Initially, Toyota’s attitude and behaviour towards problem solving was described from the point of view of The Toyota Way. Thereafter, a literature study on practical problem solving was completed. Furthermore, a pilot study was carried out where Volvo Aero’s approach to practical problem solving was applied to an organisational problem. The pilot study was evaluated and areas for improvements were identified where the methodology was difficult, indistinct and inadequate guided. Finally, improvements were proposed regarding Volvo Aero’s approach to practical problem solving, which was scientifically anchored to Toyota.

    • Defining and analysing the symptoms brings understanding for the causes of the problem
    • Quantifying the present condition and the expected illustrates the magnitude of the problem
    • Appears the root cause to be clear is probably the countermeasure obvious
    • A considerable approach using Plan-Do-Check-Act (PDCA) provides an effective and strong tool for continuous improvement

    The improvements were proposed with purpose to simplify Volvo Aero’s methodology and to support and guide the user, which creates sound conditions for effective problem solving and provides opportunities for daily use that foster continuous improvement.

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    praktisk problemlösning
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