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  • 201.
    Karimi Neghlani, Paria
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    SLM additive manufacturing of Alloy 718: effect of process parameters on microstructure and properties2016Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Selective laser melting (SLM) is one type of the Additive Manufacturing (AM) processes as a novel technique to fabricate 3D components in a layer-upon-layer style with less need to post-processing. In the SLM process, samples can be designed by computer-aided design (CAD) software, and produced in any shape. Compared to other AM processes, SLM method presents several advantages, one of which is manufacturing of complex-shape samples with very high accuracy. In SLM process, the microstructure characteristics and mechanical properties can be controlled by changing process parameters. Therefore, SLM process can be used to manufacture many industrial components, e.g. combustion chambers, medical components, and nuclear reactors.

    In the present survey, SLM process with different process parameters is used to create 25 cubic samples from Alloy 718 with 10×10×10 mm3 dimension. The as-fabricated samples are cut into two subsets in order to study the influence of two main process parameters including point distance and laser exposure time on the microstructure and properties. The samples are hot mounted to examine the normal reference planes (parallel to build direction). Microstructural characterization has been carried out using Optical Microscopy (OM), Scanning Electron Microscopy (SEM), Energy Dispersive spectroscopy (EDS) and X-ray Diffraction (XRD). Microstructure in the as-fabricated section of sam-ples illustrated highly dendritic growth parallel to build direction in the normal reference planes. The microstructures present some changes within the build direction; the top layers show coarser columnar dendrites compare to the bottom layers with slimmer columnar dendrites owing to a higher cooling rate. SEM/EDS analysis show the presence of some fine phases e.g., Laves and metallic carbides in the γ-matrix and verify the segregation of Nb element in all 25 test samples due to high cooling rate. The porosity content of samples is measured using two methods of image analysis and point counting. The effect of laser energy input, which comprises the effect of laser exposure time and point distance is investigated on the total porosity (round and irregular pores). It is observed that the round porosity content is lower than irregular porosity and the minimum amount of total porosity is around 0.07 vol. % gained at laser energy input of about 265 J/mm3. Mechanical properties is represented by measuring the Micro-Vickers hardness (HV). The microhardness of as-fabricated samples shows a dependency on the laser energy input on the normal reference plane in all the samples. The average microhardness in the as-fabricated samples varies from 291 to 339 HV0.5.

  • 202.
    Karlberg, Eric
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Högberg, Rickard
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Kartläggning och utveckling av leverantörsamarbeten: En fallstudie på en inköpsavdelning2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This project is performed in Serneke Bygg AB in Gothenburg. The aim of the project is to identify methods for identifying and mapping critical suppliers of Sernekes projects and identify approaches for promoting long-term agreements resolving relationships while competition between suppliers is preserved. Only suppliers who in 2016 invoiced 10 million SEK or more to Sernekes projects will be considered.

    The objectives of the project were to answer the following questions: • Identify method to categorize suppliers. • Identify the success factors for promoting supplier relationships. • Present proposals for working methods, with the aim of promoting the company's supplier relationships.

    The project has been implemented as a problem-solving, and a normative study. The study approach has begun whit literature study in relevant topics. After the data collection, has methods to identify and categorize suppliers analyzed. From the theory and data collection the result of the study was compiled. The construction industry is characterized by the purchase accounting for 60-80% of the total project costs. This relationship means that the importance of purchases has grown increasingly over other functions in the company. The company wants to work with multiple suppliers because they believe that the market is homogeneous, and they can use competition to reduce costs. The conclusions are that Serneke initially should create a plan for the segmentations process and how it will be implemented in the organization. Serneke should initially start the process of segmentation at a level that the organization believes is manageable, for the organization to see the results of the segmentation. Serneke should formulate three to five segmentation criteria that the company can use in the segmentation process. Serneke can assess suppliers scale of interaction. This by placing the supplier in an interaction model. Success factors for promoting Sernekes supplier relationships is to understand how to act against suppliers, depending on what market suppliers act in.

  • 203.
    Karlsson, Anton
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Överkritisk bearbetning av strukturdetalj2014Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis is a collaboration between Production Technology Centre (PTC) and Saab Aeronautics. The aim of this work was to present a methodology developed by Prof. Yusuf Altinta and to investigate the possibility of processing in the supercritical area with the method approach. The work is delimited to the vibration abatement with exclusively using Prof. Yusuf Altintas methodology.

    As the demand for better and more durable materials increases, this means that the manufacturing methods have evolved significantly over the past years. By processing in the supercritical area there is potential for significant productivity gains.

    The work has been divided into three parts consisting of theoretical studies, practical exercises and case studies. The theoretical studies consisted of review of scientific articles and literature on the subject, specifically mentioned the book, Manufacturing automation of Prof. Yusuf Altintas. Practical exercises consisted in the management of the software Mathcad , Cutpro and equipment for the excitation of the machine tool. The two case studies have been performed on Formfräsning AB and Saab Aeronautics, together the case studies included both roughing and finishing processing of aluminum.

    When roughing in aluminum, has an increase in the volume removal rate been possible by 392 percent. Poor surface after finishing caused by vibrations can be identified with a combination of stability lobe diagram, SLD and input parameters. For a derivation of this relationship a study of the cutting tool wrap angle is necessary.

    Both case studies results demonstrate the potential for optimizing both roughing and finishing of the work methodology applied

  • 204.
    Karlsson, Axel
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Framtagning av beräkningsmall för rullaxlar2015Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this project the possibilities to improve Hofpartner AB's calculation model for reel shafts has been investigated. The investigation has focused on user friendliness, economy and strength calculations. The goal was to make the model easier to use.

    An investigation of the current model shows that it is difficult to follow the calculations and that the results in most cases are not particularly accurate. Thus the work is focused on identifying the existing problems and improving on them.

    Several of the functions in the model are removed and the model now only handles information that are used with some regularity. By reducing the amount of data covered by the model possibilities is seen to simplify usage and to reduce the amount of necessary prior knowledge.

    New formulas for the strength calculations are presented and implemented in a new model. The formulas are verified by analysis with FEM. The analysis shows that the model is providing results close to the real values.

    The economical calculations are constructed as a basis for Hofpartner to continue developing. The necessary formulas are implemented but an investigation of the company's production process is necessary to achieve correct results. The newly constructed model mostly contains estimates of costs related to production time and material. If these estimates are updated with correct values Hofpartner has the possibility to achieve very reasonable results in their model.

  • 205.
    Karlsson, Erik
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Åkerlund, Per
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Utvärdering av Prio-tal för produktionsstyrning för GKN Aerospace Sweden2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis is performed at GKN Aerospace Sweden AB in Trollhättan. The purpose of the thesis is to evaluate the principle for production control Prio-tal, which GKN Aerospace developed. The goal of the study is to evaluate Prio-tal in comparison with other production control principles that from an assessment are considered relevant. The thesis is limited to comparing Prio-tal to the FIFO principle with focus on the factors; throughput time, tied up capital and service level. GKN is a manufacturing industry with mainly function-oriented product flows. What makes the thesis focus is to investigate on how the production control principle Prio-tal affects a function-oriented production. This thesis is a qualitative and quantitative study conducted with the help of including interviews, observations and brainstorming. The evaluation is performed with a simulation model in the computer program Simul8. The simulation model contains four fictitious product flows who interact with each other. The simulation model was used to conduct experiments that generates comparable results to the defined factors. To structure the experiments DoE (design of experiments) was used. Throughput time, capital and service is contributing factors to maintain a smooth production flow. To increase customer value to manufacturing, companies strive to reduce the throughput time and therefore achieve a good delivery service. By reducing throughput time more capital is free, capital that can be added on, for example development. The results from the simulation study demonstrate that Prio-tal performed better than FIFO according to the factors; throughput time, tied up capital and service level. The comparison establish that throughput time is shorter, more capital is released and the service level increase. The report's discussion deals with restrictions that affect the project overall. Prio-tal is discussed from the perspective of sustainability where the company through the release of capital can use the released assets to example development of more environmentally friendly aircraft engines. Finally the discussion is about the Prio-tals ability to generalize. Since the evaluation of Prio-tal referred to a type of business as GKN's production system, it-ispossible-to-use-Prio-tal-in-other-function-oriented-production-system.

  • 206.
    Karlsson, Hanna
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Tullock, Hanna
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    User perceptions of belt in seat installations: A comfort and mobility study2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis' work has been conducted at and made possible by Autoliv Sverige AB in Vårgårda. The aim of this thesis is to study how the occupant experience of the belt changes when it is moved from a traditional installation point in the car's B-pillar, to the seat. This shall be studied in terms of how the perceived comfort is influenced by a belt in seat in an upright and a reclined seat back position of 20 and 45 degrees, for different sizes of occupants. Also how the ability to reach a belt in seat is affected by the size and mobility of the occupant. Based on this new knowledge, an optimal outlet position for a belt in seat shall be proposed, from a comfort perspective. The work has used a cross-sectional research approach to achieve its purpose. Through the cross-sectional approach, several different qualitative and quantitative methods have been used. Initially, a literature study where subjects relevant to the forthcoming study was studied. Meanwhile, a competitive analysis of existing belt in seat installations in new cars available on the market was planned and carried out. In the main element of this work, a two-part comfort and mobility study with a belt in seat was performed. The study combined the methods interview, survey and observation. Through the interview, qualitative questions were asked as a complement to the quantitative responses given by the test subjects on scales in the survey. Observations were used to observe the subjects' behavior and difficulties regarding the belt in seat. A major limitation of the results of the study is the deficient distribution of sitting heights and genders in the group of test subjects, which founded a certain bias in the results. This has been the reason why it has not been possible to draw any certain conclusions from the results, however, some trends have been seen. The comfort study revealed several different assessments of the belt that contributed to discomfort, including the perception of the belt being too close to the neck or too far out on the shoulder. Additionally, the discomfort significantly impaired when the seat was reclined to the relaxed state. The mobility study showed that more subjects felt limited by their own bodies in the movement than by the belt. In addition did the reversed belt geometry create large discomfort issues at the neck. An important conclusion of this thesis is that the seat's design is as important to the customer experience of discomfort of the belt as the positioning of the outlet. It has also become clear that the accessibility of a belt in seat is strongly limited, as it was tested in this study.

  • 207.
    Karlsson, Leif
    et al.
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Hurtig, Kjell
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Svensson, Lars-Erik
    University West, Department of Engineering Science, Division of Production Engineering.
    Influence of dilution on properties of high strength steel weld metals2014In: Biuletyn Instytutu Spawalnictwa W Gliwicach: Rocznik 58, 2014, p. 65-71Conference paper (Refereed)
  • 208.
    Karlsson, Peter
    et al.
    University West, Department of Engineering Science.
    Öhman, Johan
    University West, Department of Engineering Science.
    Hantering av pallformat hos Parker Hannifin AB i Trollhättan2011Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Examensarbetet har utförts på Parker Hannifin AB i Trollhättan under läsperiod två vårterminen 2011. Parker utvecklar, producerar samt säljer hydraulmotorer och hydraulpumpar. Hela koncernen har över 60 000 anställde och är verksam världen över.

    Då ett förbud infördes mot lyfttruckar med åkande förare inom produktionen för några år sedan, har frågan angående hur interna materialtransporter skall lösas ständigt varit aktuell. Frågan har tillfälligt lösts genom att använda en så kallad "tvestjärt" som förser produktionen med material. "Tvestjärten" drar upp sin last bakom sig på lyftgafflar vilket gör att den hamnar i en gråzon om den är tillåten eller inte att användas i produktionsområdet. Tillvägagångssättet är heller inte optimalt då den fungerar som en taxi. Projektet är att finna ett lämpligt alternativ på hur materialtransporter skall utföras av ett fordon utan lyftgafflar.

    Genom informationsinsamlingar via Parkers affärssystem JDE kunde förståelse fås för hur dagens beläggning för "tvestjärten" är. Med hjälp av dessa uppgifter kunde utnyttjandegrad på "tvestjärten" fås och tas hänsyn till vid val av utrustning. En SWOT-analys har gjorts för att öka förståelsen om dagens utrustning och kunna mäta den mot den presenterade lösningen från STILL. Flexibilitet, säkerhet och ergonomi är aspekter som tagits hänsyn till.

    Resultatet kan redovisas genom bland annat att möte med leverantören STILL och ett studiebesök på Parker i Borås gjorts. Genom detta så presenteras två olika alternativa lösningar. Lösningen från STILL som resultatet behandlar anses vara den lämpligaste för Parker då denna uppfyller önskade krav. Förslag till framtida arbeten samt utveckling av utrustningen tas upp som det sista i denna rapport.

  • 209.
    Karlsson, Robin
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Projekteringsunderlag för hydraulisk rörspräckning och granskning av utfört projekt2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Examensarbetet har utförts på uppdrag av Trollhättan Energi AB, som önskat erhålla ett projekteringsunderlag för ett kommande förnyelseprojekt samt ett granskningsunderlag av ett nyligen utfört arbete. Syftet med rapporten är att förbättra den interna kunskapsnivån angående beräkningsmetodiken för om hydraulisk rörspräckning är en möjlig metod, tänkbara rörmaterial vid metoden och om dimensioneringsmetodiken för rör som föreligger, för att motverka komplikationer i framtida projekt.Rapporten innehåller en ekonomisk kalkyl om huruvida schaktfri ledningsförnyelse är fördelaktigt kontra schaktning, utifrån de projekt Trollhättan Energi AB utfört mellan åren 2009-2015. Därefter följer en redogörelse för om hydraulisk rörspräckning är en möjlig metod vid ett kommande förnyelseprojekt i Sjuntorp, där beräkningsmetodiken för om metoden är möjlig behandlas. Vidare följer en kartläggning av tänkbara rörmaterial vid hydraulisk rörspräckning, som identifierats via en litteraturstudie och ett flertal intervjuer med personer inom branschen. Därpå behandlas dimensioneringsmetodiken för ett rör i samband med en uträkning för projektet i Sjuntorp. Slutligen följer en sammanställning av en enkätundersökning angående hydraulisk rörspräckning som genomförts i projektet och en granskning av ett nyligen utfört rörspräckningsprojekt på Stallbacka industriområde.I slutsatsen konstateras att schaktfri ledningsförnyelseteknik är att föredra, varpå hydraulisk rörspräckning bör utföras där möjlighet föreligger. Det belyses även att hydraulisk rörspräckning är en möjlig förnyelsemetod för det kommande projektet i Sjuntorp utifrån rådande förutsättningar, men att en geoteknisk undersökning krävs för att ytterligare säkerställa det här. Vidare betonas att polyeten, PE100, med en skyddskappa av polypropen är ett lämpligt rörmaterial, men att spaltens storlek har stor inverkan på huruvida dimensionerande värden överskrids för SDR-klass 17, varpå segjärn kan vara ett alternativ beroende på kostnadsskillnaden gentemot en högre SDR-klass. Samtidigt är det möjligt att rör av polypropen med en hög elasticitetsmodul kan komma att användas i allt större utsträckning i framtiden. Slutsatsen av enkätundersökningen är att polyeten är ett vanligt rörmaterial vid hydraulisk rörspräckning och att en noggrann undersökning av de förutsättningar som föreligger är viktigt att beakta. Till sist konstateras utifrån granskningen av projektet på Stallbacka och i likhet med enkätundersökningen, att en utredning av rådande markförhållanden är central. Dessutom kan det fastställas att beräkningen för om hydraulisk rörspräckning är en möjlig metod, var bristfällig, samt att segjärn eventuellt borde använts som rörmaterial motiverat av högre diffusionstäthet.

  • 210.
    Kjellerås, Jerry
    University West, Department of Engineering Science, Division of Automation Systems.
    Analys av ett presshärdningsverktyg2015Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Press Hardening is a technique in which a sheet of boron steel under very high pressure is formed and hardened. The company AP&T, which manufactures sheet metal forming presses, got a problem with a press hardening tool they had constructed. The customer had reject the design with the argument that the tool was to weak and that it at the press operation would deform too much. AP&T´s response was to design a reinforcement to the tool, but even with the reinforcement the client meant that the tool was too weak. In this work, finite element analyses has been performed in order to judge if the tool without and with reinforcement is stiff enough.

    The analyses show that the stresses in the tool are very low relative to the yield strength of the material of the tool and that the deformations are so small that they will not affect the end-product more than marginally. The result also shows that the design of one of the tool parts is worse than the others, since "guiding grooves" in the part is weakening it so that the biggest deformation is located there. The analysis of AP&T's reinforced tool showed no significant difference in deformation or stress. The reinforcement was redesigned taking into account the shortcomings of AP&T´s reinforced tool. A new analysis showed that the deformation decreased, especially at the "guide grooves".

  • 211.
    Klasson, Madelene
    et al.
    University West, Department of Engineering Science.
    Spahic, Lejla
    University West, Department of Engineering Science.
    En investeringsbedömning i ett fönstertillverkande företag2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis has been performed in a company named Westcoast Windows AB inTrollhättan, with a purpose to decide, on the basis of an investment judgment, whether it is profitable for the company to invest in a new CNC-machine. The aim of this study was to calculate and assess the profitability of the investment as well as to construct a useful and readable investment template that Westcoast Windows AB can use for future investment decisions.

    Westcoast Windows AB is a window manufacturing company that is a part of the Santexgroup, which consists of three companies that manufacture and sell windows, conservatories and glazing. Common denominators for the group are quality, energy performance as well as design and functionality. Today the company has a CNC-machine that is overloaded and is therefore a bottleneck. The current machine can not possess certain elements that the company wishes, instead some operations are manually assembled in the final assembly. This leads to unnecessary intermediate storage and a smaller ergonomic work for the workers. Therefore, the company wants to invest in a new CNC machine where fifty percent of the capacity from the current machine will be moved to the new one.

    In order to assess the company’s financial position, a situation analysis was made where relevant ratios, such as liquidity, solvency and profit margin were analyzed. Furthermore, two value stream analysis were made to see what influences the investment came to have on the flow compared to the current design. Later on the investment’s economic influences were calculated with an investment calculation, where the present value method and the pay-back method were used. Finally, an investment template inspired by this study’s approach, was formed.

    The study resulted in that one investment option was deemed profitable for the company. With the result and analysis as a basis for the decision, there were more factors that weighed for the investment to be implemented.

  • 212.
    Klevendal, Niklas
    University West, Department of Engineering Science.
    Robotized assembly simulation of a coupling2010Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The goal of this master´s thesis is to simulate a robotized assembly of a small model of VBG Group couplings. By the software; Process simulate has the simulation model built up and the simulation been done. The simulation model is built up of the coupling parts and resources; conveyor, fixtures, compress machine, grippers, nut and screw sorter. All parts and resources, except the compress machine, the fixture and cage for the shaft, have been designed under the whole project. A study on how assembly simulation works in the software has also been done.

  • 213.
    Krantz, Marthin
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Andersson, Rikard
    Robotized Polishing and Deburring with Force Feedback Control2010Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Force control is introduced to robots to solve the problem in machining applications due to the fact that the robot compliance might cause deviation between actual and desired robot path. Also large tolerances in the casting process as well as positioning errors from the clamping create deviations for which the force control technology can adept. Force control has also shown successful in automatic learning of paths along non linear surfaces.

    This study investigates the possibility of introducing robots equipped with force control at Volvo Aero Corporation in order to robotize polishing and deburring processes. These are today performed by manual labor. This study investigates more specifically the ABB Force Control machining application package. The polishing process has shown to be very complex and today’s version of the ABB force control package cannot give sufficiently robust results to be recommended for implementation. The major issue is the non-existing compliance of tool orientation needed to adapt to casting and positioning deviations due to varying work piece dimensions. The deburring process has however shown to be easier to handle, and a robot cell and methodology is proposed in this report.

  • 214.
    Kristensen, Joakim
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Hansson, Rickard
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Simulation and calculation of the thermal dissipation in a battery pack2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Batteries used to propel automobiles today have a lot more capacity than 16 years ago when the lithium based batteries were discovered. Lithium-ion batteries are frequently used in the automobile industry, however, lithium based batteries are very sensitive to the charging level and operating temperature. So it is important to have a cooling and heating system to ensure that the batteries stay within a limited operating range in order to optimize their usage and avoid thermal runaway.

    A battery pack with implemented cooling system was identified through data and STEP-files provided by NEVS, and COMSOL Multiphysics were used to simulate the system in order to observe the thermal dissipation. Simplifications were done to be able to easily mesh the model, shorten the computation time and also because of the limitation of knowledge in more complex areas in order to perform the simulation. The refrigerant used was EGL (ethylene glycol), a commonly used refrigerant in the automotive industry, and the flow type of the refrigerant was identified through the use of the dimensionless quantity Reynolds number. After showing that the flow is laminar, a non-slip boundary condition was defined for flow in the simulation meaning the refrigerant will have zero velocity at a solid boundary.

    The heat generation of the battery cells was identified through calculations of the joule heating and dissipated energy in the electrode over potentials. The velocity, flow and heat transfer of the refrigerant can differ depending on the size and form of the cooling pipes, so different pipe profiles were experimented with to identify an optimal profile. Results of the simulation using the batteries maximum current (given by a curve illustrating the amperage passing through a battery cell during a test drive) showed that the maximum temperature by far surpassed the limited operating range.

    After analyzing the given system, it was observed that the battery pack received a sufficient amount of cooling to keep the temperature between the operational parameters. However, the simulations showed that the modules that were connected in series didn’t have as optimal cooling as the modules connected in parallel. Because as the refrigerant passes through the first module it transfers heat from the module to the refrigerant (which is the definition of cooling) and thereby have a higher temperature as it passes through the second module than the first one, giving the second module a higher overall temperature. Because of the higher temperature in the second module, it is also more prone to aging. The analysis of the different profiles showed that even though there is a difference in velocity as the refrigerant passes through the cooling pipes, the heat dissipation showed a low difference. Giving only a difference in temperature of 3°C.

  • 215.
    Kristiansson, Lilia
    University West, Department of Engineering Science, Division of Mechanical Engineering.
    Competence development through Project-based learning in higher education i Sweden and England2012In: 40th annual congress of the Nordic Educational Research association, NPFP/NERA: 8-10 mars, 2012, Copenhagen, Aarhus: Department of Eduation, Aarhus University , 2012, p. 286-Conference paper (Refereed)
    Abstract [en]

    The focus of higher education curricula has been changing from factual knowledge acquisition to developing students competences in response to a changing professional environment in the context of a knowledge economy and labour market globalisation.

    Despite these social changes, existing teaching and learning strategies in Engineering are still mainly lecture-based.

    We investigate competence development using a Project- Based Learning (PrBL) environment on a range of Engineering programmes at Lancaster University, UK and Högskolan Väst, Sweden. We evaluate the PrBL potential to enhance student employability prospects.

    PrBL is an example of collaborative student-focussed learning underpinned by constructivist theory which encourages deeper learning via construction of meaning, connection of ideas and creation of meaningful artefacts. PrBL stimulates collaborative knowledge building among participants and develops a range of skills through creating an informal learning environment. First and second-year students on undergraduate programmes in Engineering departments in both universities with projects as part of their course participated in this study. In the UK the students had to design, build and test two types of robots. The Swedish students were given a project to make calculations for a pump with preset parameters. The projects were designed to help the students acquire competences relevant to their future career. All students worked in small groups. After finishing their projects, the students completed an open-ended questionnaire about their experiences.

    The students evaluated PrBL positively, stating that they developed problem solving and analytical skills and the ability to apply mathematical tools. They highly rated collaboration with peers and emphasised the necessity of developing time management, communication and organisational skills.

    Higher education systems in Europe including Scandinavia are facing new challenges in developing students' employability. We conclude with recommendations for promoting PrBL in university courses as it contributes to competence development and is an efficient tool when administrative resources are limited and when academic staff are faced with large student numbers.

  • 216.
    Kumar, S.
    et al.
    International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad, India.
    Vidyasagar, V.
    International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad,India.
    Jyothirmayi, A.
    International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad, India.
    Joshi, Shrikant
    University West, Department of Engineering Science, Research Enviroment Production Technology West. International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad, India.
    Effect of Heat Treatment on Mechanical Properties and Corrosion Performance of Cold-Sprayed Tantalum Coatings2016In: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 25, no 4, p. 745-756Article in journal (Refereed)
    Abstract [en]

    The cold-spray technique is of significant interest to deposit refractory metals with relatively high melting point for a variety of demanding applications. In the present study, mechanical properties of cold-sprayed tantalum coatings heat treated at different temperatures were investigated using microtensile testing, scratch testing, and nanoindentation. The corrosion performance of heat-treated coatings was also evaluated in 1 M KOH solution, and potentiodynamic polarization as well as impedance spectroscopy studies were carried out. Assessment of structure–property correlations was attempted based on microstructure, porosity, and intersplat bonding state, together with mechanical and corrosion properties of the heat-treated cold-sprayed tantalum coatings. Coatings annealed at 1500 °C, which is very close to the recrystallization temperature of tantalum, were found to perform almost as bulk tantalum, with exciting implications for various applications.

  • 217.
    Kyrk, Ellinor
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    An analysis of the logistic elements needed to successfully introduce a new product2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

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

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

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

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

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

  • 218.
    Kämpe, Malin
    et al.
    University West, Department of Engineering Science, Division of Process and Product Development.
    Albertson, Peter
    University West, Department of Engineering Science, Division of Process and Product Development.
    Design for Manufacturing: för produktionsanpassad konstruktion på Volvo Aero2011Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of the Bachelor’s Thesis was to create a tool for the gathering of experience data for the product development process. It should contribute to a systematic operation approach at Volvo Aero Corporation. It should also contribute to improve productivity and producibility on future concepts. The problem described in the Bachelor’s Thesis is based on a pre-study performed at the company during the autumn 2010.

    The general task was defined as develop a structure for re-use of manufacturing experience and to create a test version of the tool for evaluation. After consultation with the selected Business Development-group from department 9931 Project-, Concept- and Manufacturing-leaders, the task was limited to gathering information of diameter dimensions from the Diffuser Case component at Volvo Aero. The creation of the tool had its starting-point in current production and the information available there.

    The Design for Manufacturing-tool has been created in Microsoft Excel and it’s developed in a way making it possible to gather and present information from different systems and sources. The tool presents the information in a pedagogical way that makes it user-friendly. The structure of the tool has been developed in consultation with the Business Development-group and the 35 columns of information is classified in three different groups: basic facts, capability and cost, operation time. By this classification the information level of detail increases from left to right which enables a more structured and systematic way of working. The knowledge, experience and data gathered represent information about the requirements the company currently produces. Over time, the Design for Manufacturing-tool is to be filled with more information from strategically chosen components which coincide with the direction the company has chosen for the development of new components.

  • 219.
    Köhler, Veronica
    University West, Department of Nursing, Health and Culture.
    Co-Creators of Scope of Action: An exploration of the dynamic relationship between people, IT, and work in a nursing context2006Licentiate thesis, monograph (Other academic)
    Abstract [en]

    Information Technology (IT) is today widespread in our work places, in our spare time and in our society overall. Implementations of IT in organizations come with high expectations on effectiveness, revenue, smoother work processes and so on. However, this simplified view on IT ignores the fact that it is the IT usage rather than the IT artifact per se that in the end decides the effect of an implementation of IT. Although the IT artifact certainly has been designed to support certain tasks and processes, the success or failure of the Information System (IS) in the end depends on the individuals' actions, which ultimately depend on their perceptions and interpretations of the IS. Thus, when technology is being implemented and becomes an IS in use, it becomes a part of work, and as such more of a social system than a technological one.

    The actual result of a design process does not solely consist of things or artifacts, but above all changed action patterns for the users. From this follows that we must consider design of artifacts as something more than merely the constructing of actual objects with functions and properties that are easily measured. Rather, a large part of all design activities has to do with design of conceivable social milieus, not artifacts. Thus, design may be defined as the suggesting and establishing of scope of action. The concept scope of action aims at describing the fact that the design of, and consequently the implementation of, a specific IT artifact always aims at creating a certain scope of action; some actions are made easier, others are made more difficult or even impossible. This scope of action has to some extent been deliberately designed, but these changes may on the other hand also be undesired and not predicted in advance. The complexity of this phenomenon is great and hard to grasp in advance. However, this does not mean that we can allow ourselves to ignore exploring this phenomenon more deeply. On the contrary, with a usage perspective on IS success or failure, scope of action becomes very important.

    Although the term scope of action may seem a rather intuitive concept, we need more concrete knowledge about its character in order to be able to understand IT usage, both when designing a new IT artifact and when studying or evaluating IT. Thus, our intuitive understanding of the concept needs to be complemented with theory on the ‘constituents’ and effects of this phenomenon. For this purpose, in this thesis nurses’ use of the Electronic Patient record (EPR) is being explored in order to gain an empirically derived understanding of the character of scope of action.

    The research findings highlight the emergent character of scope of action. It is obvious that an individual’s scope of action is not being created on one occasion, and above all not only by the IT artifact. Various co- creators such as the IT artifact, the usage and the social context create and re-create scope of action. Also, how the individual interprets and understands the IT artifact in IT usage will influence her scope of action. This since sensemaking and learning processes on both a personal and organizational level take place that are co-creators of the individual’s scope of action, at the same time as the individual’s knowledge and previous sensemaking and learning influences her use of the IT artifact.

    Thus, reasoning, thinking, learning, and the IT artifact co-evolve over time in adaptation and appropriation processes. This means that IT as a mediational means constitutes an important co-creator of scope of action. From this also follows that work integrated learning is an important co- creator of scope of action when using IT in a work setting, at the same time as work integrated learning is being influenced by the individual’s scope of action.

    Finally, in order to understand how scope of action emerges in use, merely focusing on structures is insufficient. Scope of action emerges as a product of interplay between complex processes involving artifacts, usage and context. This means that the user’s scope of action is co-created by both static structures as well as dynamic processes relating to the IT artifact, the organization, and the work practice. Thus, the IT artifact, and subsequently scope of action, must be must be understood in relation to the multi-aspectual context of which it is a part instead of merely in relation to the properties of the IT artifact per se.

  • 220.
    Lagrosen, Yvonne
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Bäckström, Ingela
    Developing a measurement system for health-related quality management2007In: 10th QMOD Conference.: Quality Management and Organiqatinal Development. Our Dreams of Excellence, 18-20 June, 2007 in Helsingborg, Sweden, Linköping University Electronic Press , 2007, p. issue 26:12-Conference paper (Other academic)
  • 221.
    Lagrosen, Yvonne
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering.
    Grundén, Kerstin
    University West, Department of Economics and IT.
    Tosteby, Jonas
    University West, Department of Engineering Science.
    Exploring the OCN method as a means of organizational learning2012In: Exploring the OCN method as a means of organizational learning, 2012Conference paper (Refereed)
    Abstract [en]

    Purpose -. The aim of the paper is to examine whether the use of the OCN-method also leads to organizational learning. The studied organisations are one municipality (Lerum) in west Sweden and one nonprofit professional Swedish organization, the Swedish Association of Body workers.

     

    Methodology/approach - The empirical data are derived from two focus group interviews of selected employees having different functions in the studied organisations and one in-depth interviews. The interviews are analyzed in accordance with grounded theory.  We also examine which strengths and possibilities for improvements the OCN-method has regarding organisational learning.

     

    Findings -  The interview questions are semi-structured and examine the degree and type of learning that is created by using the OCN-method. Using open-ended questions is assumed to be well suited for research in new areas.  The findings from the interviews are related to the five disciplines of the learning organisation.

     

    Research limitation/implication- The empirical data is limited to two different kinds of organisations. It would be of general interest to examine whether the usage of the OCN-method also contributes to learning in organisations.   

     

    Orginality/value - The connection between the OCN -method (Open College Network) and the learning organisation is not very well examined.

     

  • 222.
    Lagrosen, Yvonne
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Lagrosen, Stefan
    Linnaeus Univ, Dept Mkt, Sch Business & Econ, SE-39182 Kalmar, Sweden.
    Aesthetic service quality: a study of a symphony orchestra2017In: Total quality management and business excellence (Online), ISSN 1478-3363, E-ISSN 1478-3371, Vol. 28, no 3-4, p. 318-330Article in journal (Refereed)
    Abstract [en]

    The purpose of this paper is to explore service quality in classical music, to relate the findings to the essence of Beauty that Kant, Plato and others describe and to discuss the implications for practice and research regarding aesthetical organisations. Some of the views of Beauty held by Plato and Kant are described and related to the theories of service quality, particularly the fundamental premises of the service dominant logic of marketing. An empirical study has been carried out at the Gothenburg Symphony Orchestra. In-depth interviews with members of the orchestra have provided qualitative data that have been analysed. The musicians’ views of quality in classical music are described. The findings are related to the philosophical theories of beauty and to the service quality theory. A model of quality dimensions in classical music is proposed. The findings of the study provide a vantage point for better understanding of the relationship between aesthetics and service quality. Service quality in music has not previously been studied and related to aesthetical theory. A limitation is that the study has only been carried out in one orchestra in one country. For managers of organisations with aesthetic activities, the study provides guidance into how service quality can be seen and handled.

  • 223.
    Lagrosen, Yvonne
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Lagrosen, Stefan
    Linnaeus Univ, Dept Mkt, Kalmar, Sweden.
    Customer perceptions of quality: a study in the SPA industry2016In: European Business Review, ISSN 0955-534X, E-ISSN 1758-7107, Vol. 28, no 6, p. 657-675Article in journal (Refereed)
    Abstract [en]

    Purpose - The purpose of this study is to explore dimensions of customer perceptions of factors important for a quality experience in the SPA industry and to assess service quality implications for these dimensions. Design/methodology/approach - The empirical study involved seven Swedish SPA hotels. The first part was qualitative, consisting of seven focus-group interviews with hotel guests. In addition, service providers’ perceptions of customer quality were collected through seven quality cafes. The qualitative parts were analysed with the constant comparative technique from the grounded theory approach. Based on the findings from the interviews, a questionnaire was delivered to 400 randomly accessed women. The responses were analysed with exploratory factor analysis and cluster analysis. Findings - The focus-group interviews showed that the customers’ perception of quality could be expressed in the following dimensions: physical effects, mental effects, pleasure and flexibility. The dimensions for customer quality seen from the staff’s perspective were treatments, climate and the SPA facility itself. The exploratory factor analysis defined the following underlying factors: enjoyment, treatments, practicality, fitness, cost and calm. The cluster analysis resulted in four groups of customer profiles: the more of everything group, the enjoyers, the savers and the fitness freaks. Research limitations/implications - Alimitation is that the study has only been carried out in one country. The main implication for research is a better understanding of quality dimensions and perceptions of service quality in the SPA industry. Practical implications - The study provides a comprehensive insight into the dimensions of quality for SPA visitors. Moreover, four distinct groups of customers have been identified. This knowledge should be useful for SPA managers. Originality/value - Only limited amounts of research have previously been carried out in the SPA industry. The paper provides a framework depicting perceptions of quality dimensions in SPA hotels.

  • 224.
    Lagrosen, Yvonne
    et al.
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Lagrosen, Stefan
    University West, Department of Economics and IT, Division of Business Administration.
    The effects of quality management, a survey of Swedish quality professionals2005In: International Journal of Operations and Production Managment, Vol. 25, no 10, p. 940-952Article in journal (Refereed)
    Abstract [en]

    Purpose – In this study, the effects of the different models and tools of quality management are examined. The purpose is to identify differences in the effects generated by different qualitymanagement models and tools.

    Design/methodology/approach – A questionnaire was mailed to 500 Swedish quality professionals. The questions concerned their companies’ adoption of the values of TQM, the use of the models and tools of TQM and the effects they notice. Correlation analysis and multiple regression analysis were carried out.

    Findings – The findings show that there is statistical correlation between the adoption of the values of TQM and successful quality management. The usefulness of the Swedish Quality Award, the European Quality Award and ISO 9000 as well as several of the quality management tools is also indicated. Regarding ISO 9000 specific effects have been found.

    Research limitations/implications – A limitation of the study is that the financial outcomes of the quality management practices are not measured but only the managers’ perceptions of effects produced. The implication for further research is an increased knowledge of the different effects of the quality management practices and the significance of the values, particularly three values that were included in the multiple regression models.

    Practical implications – The specific findings on the effects of ISO 9000 are useful for managers when implementing the standard. The results of the study also indicate the importance of emphasising the values for successful quality management.

    Originality/value – This study has provided more detailed knowledge of the effects of the differentquality management practices, particularly of ISO 9000.

  • 225.
    Lagrosen, Yvonne
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Travis, Frederick
    Maharishi Univ Management, Ctr Brain Consciousness & Cognit, Fairfield, IA USA.
    Developing a neuropsychological measurement to capture workplace learning2016In: Journal of Modelling in Management, ISSN 1746-5664, E-ISSN 1746-5672, Vol. 11, no 3, p. 783-801Article in journal (Refereed)
    Abstract [en]

    Purpose - The purpose of the paper is to examine variables to be included in a measurement instrument which measures workplace learning related to recent research into quality management and brain functioning. Design/methodology/approach - A literature review was conducted, investigating measures of workplace learning as well as the connections between brain functioning and management. Further studies will use the brain integration scale to compare levels of brain integration with measures of workplace learning. Findings - The variables “empathy”, “presence and communication”, “continuity”, “influence”, “development”, “work-integrated learning” and “flow” were found to be relevant from the literature review to be tested for inclusion in the measurement instrument. A measurement model with these variables included has been developed. Research limitations/implications - This paper is conceptual in its nature. Empirical studies are needed to validate the propositions. Practical implications - The proposed measurement instrument can be used by managers to gain insight into underlying mechanisms in the organizational culture that influence employees’ learning and potential for development. Thus, it can aid managers to achieve profound learning in their organizations, which is necessary for continuously maintaining high quality of products and services. Social implications - For society, the implementation of the proposed measurement instrument in companies could lead to better health and higher job satisfaction among employees. Originality/value - Traditional ways of measuring working environment are rarely connected to brain functioning of the employees. Only requiring small resources, this approach adds to an understanding of underlying mechanisms.

  • 226.
    Lang, Johanna
    et al.
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Skön, Joakim
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Framtagning av ny monteringsutrustning för eliminering av arbetsskador vid montering av hydraulmaskiner2014Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis deals with the development of a new assembly equipment at one of the assembly stations for hydraulics machines at Parker Hannifin Manufacturing Sweden AB. The goal was to perform a concept selection process on the concepts that were generated during the pre-study. The result from the concept selection should be the six most suitable concepts for mounting the drum housing on the bearing housing. The reason that the existing assembly equipment is to be replaced is because it causes work-related injuries. To create an understanding about these injuries and how to avoid them, a literature study about ergonomics was performed. The concept selection methods used in the thesis was Concept Screening and Concept Scoring. The choice of the six final concepts was based on the results from the completed concept selection methods and the obtained knowledge from the literature study. Out of the final concepts, the concept that was found most suited for fast implementation was chosen as a recommendation. The recommended concept consists of a negative mould to the hydraulic machine's top side and a hydraulic press. The mould is placed on the hydraulic machine's top to create a flat surface to press on. A visual CAD model and an FMEA were performed on the concept.

  • 227.
    Larsen, Tobias
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Konstruktion och modularisering av en vagn för en batterilyft2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

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

  • 228.
    Larsson, Emma
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Gren, Maria
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Värdeflödesanalys för kartläggning av ett produktionsavsnitt: En studie för att identifiera och minimera icke värdehöjande aktiviteter vid Rybergs Charkuteri AB2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Rybergs Charkuteri AB is a well-known brand of charcuterie located in the outskirts of the city Uddevalla, on the Swedish west coast. The company has of today 35 employee and had a turnover of 82 million Swedish crones, year 2015. In the production department of producing sandwich topping, employee's estimates that 50 percent of the available working hours consist of non-value adding activities. The non-value adding activities consist of setup of machines between different packages, cleaning equipment and other not specific non-value adding activities.

    As of today Rybergs Chakuteri AB has no information or numerical values which can confirm the employee's estimation. The goal with the bachelor thesis is to determine the process of today with relevant numerical values and present improvements to the process. In order to identify the activities of the process the method value stream mapping has been used. The Bachelor thesis starts with data collection from the production department and all data collection is performed by the authors. Production-workers, the sales office and production manager have been interviewed in the purpose of collecting a wider range of aspects affecting the production department. Benchmarking has been done with two other companies within the food industry in order to offer a wider perspective of how companies within the food industry manage setups and production planning.

    The result of the value stream mapping determined that 66 percent of the available working hours consist of value adding activities, 13 percent of non-value adding but necessary activities and 21 percent of non-value adding activities. The result is shown in three value stream maps, one of each packaging solution and contains the numerical values of cycle time, setup time, throughput time and value adding time. Further are underlying factors to the non-value adding activities discussed and suggestions of how the factors could be minimized or eliminated is presented. Finally, improvement proposals in order to streamline the production department is presented. The authors suggest a change in one of the current packaging methods, the suggestion being, implementation of a pulling production system in order to balance the flow throughout the factory. Further a suggestions are implementing a separate cleaning shift in order to utilize the available working hours and to invest in a folding machine in order to reduce a production worker is discussed the number of working hours and needing an employee less.

  • 229.
    Larsson, Kristoffer
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Jämförande studie av tillverkningsmetod vid cisternbyggnationer2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis is a comparative study of the manufacturing method of tank constructions that has been carried out in the spring of 2016. The work has been performed together with the Tank department at Rodoverken AB. Rodoverken builds accumulators, cisterns and pressure vessels with a unique construction method called The spiral method. The aim of the work was to evaluate proposed plate sizes used in the spiral method. The evaluation will focus on the time and cost savings the company can make with the use of different plate sizes.

    The procedure during the work started with studying the theory and the methods that were relevant to the topic. This theory chapter contained both information about the company's building technology and models used in this study to meet its primary goal. In the next step the data collection started, the aim was to gather information and identify which aspects were affected by the extended plate sizes. The data collection was conducted through studies on previous work, observations and interviews. When all the data were collected the analysis work started. An aspect impact study was performed together with the company. The impact study contained all the identified aspects and their consequences. After this an FMEA-analysis was performed based on the previous aspects, this showed the most critical aspects based on the availability, seriousness and the possibility to affect the problem.

    The calculations on this study were carried out on proposed plate sizes that Rodoverken had contributed. An evaluation was made with three different plate designs to calculate the time and cost reduction based on the total meter weld on the tank. The old plate design was used as a reference and two new larger plate sizes were used in the evaluation as well. A summary was made containing the costs that increases when the company starts to use larger plate sizes. This included the cost of transport and the necessary equipment that has to be invested in order to handle larger sheet sizes. The compilation of cost including the cost reduction in welding and the costs of transport and new investments were compiled and provided the total savings of the different plate sizes.

    The total savings of the different plate sizes:

    Plate size 2 (3300x9600mm): 127155 kr.

    Plate size 3 (3200x10700mm): 146800 kr.

  • 230.
    Lehtinen, Jesper
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Myrén, Jennie
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Framgångsfaktorer för effektivare förbättringsarbete2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis was originated by Volvo Penta in Vara announcing a need to shift the focus and streamline the company's efforts for improvement. Previously, the focus had been directed towards the workplace standard and 5S, but now the focus will be on minimizing waste and reducing causes of quality defects and delayed deliveries. The project group was given the perspectives of organizational culture, work structure and leadership philosophy by Varafabriken as a starting point for creating a proposal for change. Along with this proposal for change, the project was asked to provide suggestions for how Varafabriken can achieve a higher efficiency in a customer-focused improvement process after reorganising into teams as well as looking at how management can be structured to make the improvement process in a manufacturing industry more effective. Answering these questions became the main goals for the project.

    Methods used to achieve these goals are literature studies, interviews, surveys, observations and benchmarking. The literature studies provided a picture of how different authors advocate that organizations should be managed to achieve higher efficiency. The 16 interviews revealed that targets in Varafabriken inhibits the improvement work and that the maintenance department that executes improvements does not have sufficient resources. The survey, with 49 respondents, strengthened the answers from the interviews indicated that the target figure related to the number of deviations per week inhibit the improvement work. During benchmarking the authors noted that the majority of the visited companies preferred to neither measure the number of deviations nor the number of improvements per employee and year. It could also be seen that three of the four companies saw a success factor from paying attention to and developing the organization’s personnel.

    Finally, the three perspectives that the thesis was given increased to four; man is the new perspective because the individual is deemed important by the authors. Based on the collected data, a proposal for change was created for Varafabriken. The change proposal is that the Varafabriken should implement Toyota Kata to obtain an increased focus on the factory’s personnel and work more proactively with improvements. Toyota Kata implements a coaching leadership that develops individuals and creates routines and behaviors that lead to a sustained pattern of thinking around improvements. The authors also recommend Varafabriken to liquidate target figures concerning the number of deviations and the number of improvements per employee and year. In addition, focus should be aimed towards the maintenance department as they are essential for the effectiveness of the improvement work.

  • 231.
    Lennartsson, Edvin
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Thorleifsdottir, Birgitta
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Steglöst växelsystem för cykel2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

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

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

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

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

  • 232.
    Leon Zapata, Diana
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Gapanalys av Bror Tonsjö ABs ledningssystem mot ISO 9001:2015 och 14001:20152016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis aims to investigate the procedures that need to be changed or introduced in the company Bror Tonsjö AB’s existing management system in order for them to be certified in ISO 9001:2015 and ISO 14001:2015. The objective is also to make suggestions on procedures that can be integrated to the company to implement an integrated management system.

    In order to achieve the objectives a Gap Analysis was performed to get an overview of Bror Tonsjös current situation. The input for the Gap Analysis consisted of a comparison between the standards ISO 9001:2015 respectively ISO 14001:2015 against ISO 9001:2015 respectively ISO 14001:2004. The compared requirements were then checked against Bror Tonsjö’s management system. The Gap Analysis resulted in identification of the extent of the gaps in the company’s management system.

    The largest and most critical gap involved the organizations preconditions which included that Bror Tonsjö in the current situation doesn’t have a detailed documentation regarding the extent and requirements needed to meet the requirements of ISO 9001:2015 and ISO 14001:2015. The new editions of ISO 9001 and ISO 14001 also directs focus on risk-based thinking and consideration of the risks and opportunities in the design of management systems. The result is that the company also received a large gap regarding the risk-based thinking and the risks and opportunities in the planning of the management systems.

    The presented solutions should close all the identified gaps. As regards to the gap regarding the organizations preconditions, a material is presented that contains among other things questions for an stakeholder analysis and questions about what the company offers. The material covers the requirements of both ISO 9001:2015 and ISO 14001:2015. To close the gap concerning risks Tonsjö should for example consider the implications a change could bring or if the function is preserved after the changes are made.

    Based on the presented solutions, it has also appeared that the routines from the quality and environmental management systems could be integrated into one management system. Both ISO 9001:2015 and ISO 14001:2015 are constructed in the same way. Because of the similar structure Tonsjö should be able to integrate their management systems without any major problems. To enable the integration of the management systems, Tonsjös management must be engaged and take responsibility for the management systems during the integration. It’s also important that the management engages the personnel that is affected by the integration of the management system to achieve a good result.

  • 233.
    Li, Peigang
    University West, Department of Engineering Science, Division of Mechanical Engineering.
    Cold lap formation in Gas Metal Arc Welding of steel: An experimental study of micro-lack of fusion defects2013Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Cold laps are defined as micro-lack of fusion defects at the weld toe more or less parallel to the surface of the parent plate. These defects are known to negatively influence the fatigue properties of weldments. Previous studies suggest that cold lap formation can not be avoided completely in Gas Metal Arc Welding (GMAW). Therefore, a better understanding of formation mechanisms is imperative to be able to minimize the number and size of these defects. The main objective of this work has been to provide a more comprehensive understanding of cold laps, including categorising, characterisation and defining the most significant factors for formation. GMAW was used to produce welds that were investigated by metallographic methods using light optical microscopy, scanning electron microscopy and energy dispersive spectrometry. A novel classification of cold laps was introduced and three types of cold laps were identified: spatter cold laps, overlap cold laps and spatter-overlap cold laps. It was shown that cold laps are partially or fully filled by oxides. The most common oxides are manganese silicon oxides which were concluded to be formed primarily by oxidation of droplets. The presence of oxides was found to significantly increase the tendency to form spatter cold laps as well as overlap cold laps. Particularly for overlap cold laps, it was found that the depth (in transverse direction of weld) is reduced when welding in a non-oxidising environment. Welding on blasted surfaces increased the cold lap formation by entrapment of gas. The droplet and base metal temperatures were also found to be significant factors in cold lap formation. For overlap cold laps the occurrence frequency decreased with increased preheating temperature of the base metal. Mechanisms of overflowing resulting in overlap cold laps were discussed based on an extensive literature review. Several phenomena are believed to contribute to overflow including Rayleigh instability, the balance of forces, transfer of lateral momentum by droplets and an outward Marangoni fluid flow of the weld pool.

    The present studies suggest that cold lap formation can be suppressed by ensuring that the welding process (arc) is as stable as possible and by welding on a preheated work piece in a non-oxidising environment.

  • 234.
    Li, Peigang
    et al.
    ESAB AB, Gothenburg, Sweden.
    Hurtig, Kjell
    University West, Department of Engineering Science, Division of Welding Technology.
    Högström, Mats
    University West, Department of Engineering Science, Division of Welding Technology.
    Svensson, Lars-Erik
    University West, Department of Engineering Science, Division of Welding Technology.
    Scotti, Americo
    University West, Department of Engineering Science, Division of Welding Technology.
    A contribution to the study of negative polarity in GMA welding2018In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 95, no 5-8, p. 2543-2553Article in journal (Refereed)
    Abstract [en]

    GMAW using the electrode with negative polarity (DCEN) has been frequently suggested as a potential means of increasing production capacity. The objective of this work was to further study the performance of negative polarity in GMAW of carbon steels. In this project phase, bead-on-plate welds were carried out in flat position to assess the effect of different potential shielding gas compositions on bead geometry, finishing and spattering. The characteristics were compared with DCEP at the same current, but depositing the same volume of material per unit of length (more industrial related comparison). The arc length was kept the same by adjusting voltage to reach shortest arcs, yet with suitable non short-circuiting metal transfer mode. An approach to measure bead convexity was also proposed and assessed. The results showed that DCEN is feasible as a means of increasing GMAW production capacity. However, to become DCEN applicable with GMAW, the results suggest an Ar based blend with around 6.5 % of O2 is the most appropriate shielding gas, as much as that there is a demand for a standard electronic controlled power source able to work in constant current mode. 

  • 235.
    Li, Peigang
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering.
    Svensson, Lars-Erik
    University West, Department of Engineering Science, Division of Mechanical Engineering.
    Markocsan, Nicolaie
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Karlsson, Leif
    University West, Department of Engineering Science.
    Cold laps - micro-lack of fusion defects in steel arc welds: a reviewManuscript (preprint) (Other academic)
  • 236.
    Lindgren, Lars-Erik
    et al.
    Luleå Technology University.
    Babu, Bijish
    Luleå Technology University.
    Charles, Corinne
    University West, Department of Engineering Science, Division of Production Engineering.
    Wedberg, Dan
    Luleå Technology University.
    Simulation of manufacturing chains and use of coupled microstructure and constitutive models2010In: Finite Plasticity and Visco-plasticity of Conventional and Emerging Materials / [ed] Aktar S Khan, Babak Farrokh,, Fulton, Maryland, USA,: NEAT PRESS , 2010, p. 4 s.-Conference paper (Refereed)
  • 237.
    Lindqvist, Björn
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Johansson, Victor
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Layout av arbetsstation vid nyproduktionslina: ett konceptförslag till IAC Group AB2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis is performed at International Automotive Components (IAC) Group located in Färgelanda, Sweden. The purpose of the work is to propose a layout of a workstation in a new production line that will be launched in autumn 2017. A layout means physical location of the components in the station. The parts produced by this production line are details of a roof shelf which is part of the interior of a Swedish leading truck manufacturer. During the project, the production line is currently being assembled and some test series is run.The work station that this thesis deals with is a welding operation of the lids before transported to a final assembly. Because the lids are manufactured in different models, the weld needs replacement of tools in order to process the current part. Different assembly tables also needs to be replaced depending on the model of the lid witch is to be manufactured.

    The work station needs to effectively have a flow of material, while the operators must have an ergonomically designed workplace, and that requires a carefully thought out layout. The process of preparation of this layout was done with methods of product development where concepts are generated and evaluated. The concept development process has been in consultation with the company supervisor and production. A total of six concepts were generated and they were graded and weighted in a matrix, which later led to the choosing of a basic model. After selecting the basic model were more concepts generated in a more detailed cell design. The last generated concepts were presented to the staff involved that eventually opted for a final concept when it met the requirements and preferences that were set. Part of the thesis was also to simulate the work of the operators, ensure the balancing and suggest possible improvements. The results in the report describes the final concept together with recommendations and guidelines of lean production.The actual implementation of the layout will be done by the company themselves.

  • 238.
    Lindqvist, Hugo
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Kristiansson, Robin
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Viktoptimering av maskinrummet på lastfartyg: En studie i topologioptimering för dagens sjöfart2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

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

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

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

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

  • 239.
    Lingbrand, Johan
    University West, Department of Engineering Science.
    Analys och beräkning av konsignationsmaterial i pall hos Parker Hannifin AB i Trollhättan2009Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Parker Hannifin AB i Trollhättan ingår i en koncern som består av 263 fabriker med över 50 000 anställda. Med 300 anställda produceras, utvecklas och säljs huvudkomponenterna i mobila hydraulsystem. Parker i Trollhättan har konstruerat och tillverkat fasta pumpar och motorer för lastvagnar sedan 1980-talet.

    Genom att eliminera aktiviteter som inte är värdeskapande och införa nya system strävar Parker efter att uppnå kortare ledtider, minskat bundet kapitel och ständiga förbättringar. Orsaken till att Parker vill införa konsignation är att det innebär många fördelar. Fördelarna är bland annat minskad administration, minskat bundet kapital och ökad tillgänglighet av detaljer.

    Examensarbetet visar att den största vinsten med konsignationslager för kunden är att det eliminerar flera delar av flödet mellan avtal till betalning. Delar som elimineras är avropsarbete, fysisk mottagning, mottagningsrapport, lagerbokföring, fakturaregistrering, fakturakontroll samt materialrekvisition. För leverantören är vinsten att fritt kunna planera försörjningen till kunden efter sin egen kapacitet. Samtidigt lagras materialet kostnadsfritt hos kunden, Parker i Trollhättan.

    Detaljerna ägs av leverantören då de ligger på lager hos Parker. Resultatet av examensarbetet visar att ägandet av material bör övergå till Parker då arbetsordern avrapporteras. Detaljernas lastbärare består av hel-pallar, där pallarna märks upp av en pallflagga. I examensarbetet har en pallflagga för konsignation skapats. Pallflaggan upplyser om att pallen innehåller konsignationsmaterial som ägs av leverantören. Informationsflödet är tydligt eftersom en fraktsedel skickas med det skickade materialet till Parker. Fraktsedeln kontrolleras med följesedel som fås av leverantören. Information måste också ges ut vid större förändringar i förbrukning så att båda parter känner sig trygga över vad som lagerhålls. Konsignation bygger på ett långsiktigt samarbete och bidrar till en tätare relation mellan företagen. Konsignation innebär en vinna/vinna-situation.

  • 240.
    Liu, Yuan
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Effect of CNC axis movement on the surface roughness in milling2015Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this paper, the performance of a new measurement system CITE (CNC Integrity Tracing Equipment) is investigated. CITE measurement system is the name given to the data acquisition hardware and software developed by University West for recording the movements of CNC machine tools. It can be used for monitoring of the milling process and recording the milling errors. The aim of this study is investigate the capability of the CITE system in prediction of the surface roughness. In an example cutting test, the CITE measurement system was used for recording selected sections in straight milling process and curved milling process. After that, surface roughness, predicted by the CITE measurement system, was compared with the CMM (Coordinate measurement machine). The investigation shows that the CITE measurement system is comparable to the CMM for evaluation of roughness in curved sections. In straight sections, the evaluation of roughness by CMM machine is close to the simulation values that predicts surface roughness considering tool run-out.

  • 241.
    Lorentzon, John
    et al.
    University West, Department of Engineering Science.
    Järvstråt, Niklas
    University West, Department of Engineering Science, Division of Production Engineering.
    Modelling tool wear in cemented-carbide machining alloy 7182008In: International journal of machine tools & manufacture, ISSN 0890-6955, E-ISSN 1879-2170, Vol. 48, no 10, p. 1072-1080Article in journal (Refereed)
  • 242.
    Lugnberg, Mattias
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Netz, Tobias
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Investigation of thermal spring back of a hot formed 22MnB5 A-pillar with tailored properties2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In a world where fuel economy and crash safety is becoming an important factor in the automotive industry, the need for materials with very high strength-to-weight ratio is growing rapidly. One of the materials used for this purpose is the boron steel 22MnB5. Since the material has very high mechanical yield limit it is hard to produce parts using cold forming, which is the standard procedure for sheet metal forming. Therefore, the use of hot stamping is increasing. Hot stamping enables manufacturing of boron steel parts with good dimensional accuracy and low spring back. However, some amount of spring back is still present during the process.

    In this thesis, spring back of a hot formed 22MnB5 A-pillar is investigated using computer simulations in the software LS-DYNA. The main focus was to develop a process for simulating spring back in hot stamping.

    The work started with simulations of the forming and quenching stages of the hot stamping process, both on a full size and on a smaller section of the blank. Simultaneously as the simulations, a literature study was also conducted. The literature study was aimed at finding hints and information on how to build the simulations. Furthermore, interviews were made with experts on both LS-DYNA and hot stamping.

    A process for spring back evaluation was then created and written as an LS-DYNA keywordfile.

    In the developed spring back simulation, the part is taken out of the press right after the quenching is finished and placed in a space where it can cool and move freely. The simulation is conducted until the part reaches room temperature.

    After the quenching is done, data containing temperatures, stresses and strains of the part is exported. This data is then included in the spring back simulation where the part is cooled to room temperature. During the cooling, the stresses, strains and temperatures are equalized until the spring back reaches a steady state.

    The results indicate that the developed method for spring back evaluation can be used to foresee shape deviations for the intended part and process.

  • 243.
    Lund, Andreas
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Utveckling av hydrauliktestutrustningskoncept för Rolls-Royce och Bentley2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This document is my bachelor’s thesis at The University West, Trollhättan, Sweden. The project is made as a part of a product development process in cooperation with Rohdins Automobile Service AB, Trollhättan, Sweden. The company’s speciality is service, repairs and renovations of Rolls-Royce and Bentley motor cars. Some of the most common cars in the workshop is Rolls-Royce Silver Shadow and Bentley T-series. These cars have a relatively advanced hydraulic height control system and the purpose is to keep the height of the car constant, independent of load conditions.

    Malfunction in the height control system is a fairly common problem and can result in reduced brake capacity. Present methods for fault diagnosis will often be time consuming and there is a demand for a more efficient way. Therefore, a concept for a hydraulic test equipment has been developed.

    The most important parts of the development process are research, identify needs, concept development and presentation. The concept will make it possible to test all height control components. The test equipment can also be connected to the car to test the complete height control system. The principal function builds on pressurizing hydraulic components to measure flow- and pressure characteristics. All components in the height control system has their own specific values of flow and pressure, which makes it possible to indicate the condition. The test equipment is electrically driven and is intended to be used in the workshop. It is possible to upgrade the product with a software based control system, so that automatic test programs can be used.

  • 244.
    Lundgren, Kristoffer
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    "Fåglar i vägen": En studie av åtgärder för minskning av olycksrisk för kollision med fåglar på flygplatser2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Kollisioner mellan flygplan och fåglar har inträffat i över 100 år och den första kollisionen med dödlig utgång skedde 1912. Den ökande flygtrafiken sedan början på 1900-talet har lett till allt fler kollisioner och dödsfallen inom civilflyget var mellan 1988-2015 över 200 människor. Förutom dödsfall orsakar kollisioner dyra reparationer, uppskattat till 1.2-4 miljoner dollar, samt förseningar för resenärer.Syftet med studien är att presentera lösningsförslag för att minska risken för kollision mellan flygplan och fåglar vid Trollhättan Vänersborg flygplats. Minskar fågellivet kring flygplatsen bidrar det till att skapa en säkrare miljö för resenärerna samt en säkrare arbetsplats för flyg och markpersonalen.För denna studie valdes aktionsforskning som metod. Metoden har likheter med fallstudier och kartläggningar som inleds på liknande vis. Studien är i huvudsak kvantitativ med några få inslag av kvalitativ art.För att systematiskt förstå och sätta sig in i problematiken tillämpades Sex Sigma verktyget DMAIC, som med hjälp av litteraturstudier, samt intervjuer skapade en god grund för det fortsatta arbetet. Datainsamlingen analyserades och viktades ut efter kravspecifikationen för att ta fram de lämpligaste lösningsförslagen åt Trollhättan Vänersborgs flygplats AB. Det visade sig att förslag som högre gräs kring landningsbanan och att skapa en näringsfattig miljö var de två lösningsförslagen som fick högst betyg. De två förslagen har visat sig synnerligen effektiva på andra flygplatser och dessa i kombination med en list kring landningsbanan är de lösningsförslag som anses mest lämpliga för Trollhättan Vänersborgs flygplats AB.

  • 245.
    Lundin, Johan
    University West, Department of Engineering Science, Division of Automation Systems.
    Infästningsadapter för provning av passagerarairbag2015Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This project has contained a development of a mounting adapter to be used for testing passenger airbags. The project started with the collection of customer requirements and this was done through interviews and observations of engineers and technicians at Autoliv. Phase two was to generate ideas and solutions and this was done by brainstorming. The developed solutions were ranked by using screening and a scoring matrix. The final concept from the scoring-matrix was an adapter with eight carriage bolts. A CAD model of the final concept was created. The FEM-analysis of the final concept showed that the developed adapter had low deformations and stresses during the passenger airbag deployment thus verifying that the concept can be used in the testing environment.

  • 246.
    Lundmark, Julia
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Magnusson, Sofia
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Kartläggning för en effektivare pallanvändning: En studie genomförd på AkzoNobel Surface Chemistry AB2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Due to requirements from AkzoNobels customers regarding that a certain proportion of the products life must remain when delivered, and that the products has to be delivered on a special type of pallet, have created different type of problems. The company follows a principle called the full-pallet principle which means that they want to deliver full pallets as far as possible. The requirements from the company and the customer are contradictory and require a solution. To meet both of the requirements the company needs to create a clear picture of the customer's order frequency, in which extend the full-pallet principle is applied and how many packs of each product that will fit on each pallet variants. The aim of the thesis is to identify areas of improvements within the company's order processing and generating a document on which products each customer buys, and how many packages that fits on each pallet. The thesis is a development of recommendations from a previous study. Books and articles in various topics were analysed to create a theoretical framework for the thesis. Continued data collection were preformed through interviews and analysis of data from the company's ERP-system. A description of the company's current situation has been created, including description of the company's customer order process and which types of packaging and pallets that are used for deliveries. The data from the ERP-system (Enterprise Resource Planning system) were analyzed and reported in form of charts and tables regarding the company's delivery capabilities, customer distribution and supply patterns. After analyzing the company's current situation four focus areas for improvement have been identified. The first focus area is that the company should focus on reviewing their reporting management in order to obtain accurate data regarding pallet usage. Furthermore should the company analyze its distributors in order to maximize the fullness of their pallet usage. The third focus area is that customers who only order with a low order frequency, and with low purchase quantities rather should order directly from distributors. Finally, the top ten customers with the highest potential for improvement were identified. With continuous work on the identified focus areas, the company should achieve an improvement in the percentage of incomplete pallets by a third.

  • 247.
    Lycke, Liselott
    et al.
    University West, Department of Engineering Science.
    Tano, Ingrid
    University West, Department of Engineering Science, Division of Mathematics, Computer and Surveying Engineering.
    Building quality culture in higher education2017In: International Journal of Quality and Service Sciences, ISSN 1756-669X, E-ISSN 1756-6703, Vol. 9, no 3-4, p. 331-346Article in journal (Refereed)
    Abstract [en]

    Purpose: The purpose of this paper is to describe an approach to build a quality culture within a higher education institution. Design/methodology/approach: This paper is based on Action research and a Case study. Findings: The authors show the result of the mapped processes of a higher education institution, Management planning and control, Education, Research and Support, and describe how the mapping was performed, working in cross-functional teams. Further on, they discuss the result of the pilot and the plan for implementation. Originality/value: A process-oriented approach in higher education institutions, with its complexity, creates opportunities for successful quality assurance and control when having an integrated quality assurance system. © 2017, © Emerald Publishing Limited.

  • 248.
    Lycke, Liselott
    et al.
    University West, Department of Engineering Science.
    Tano, Ingrid
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Building Quality Culture in Higher Education2016In: Proceedings of the 19th QMOD-ICQSS Conference, International Conference on Quality and Service Sciences, September 21-23, pp. 939-952, Rome, Italy. / [ed] Su Mi Dahlgaard-Park, Dr. Prof., Lund University & Jens J. Dahlgaard, Dr. Prof,. Linkoping University, Lund: Lund University Library Press , 2016, p. 939-952Conference paper (Refereed)
    Abstract [en]

    Purpose - Describe an approach to build a quality culture within a Higher Education InstitutionMethodology/Approach Case study

    Findings - We show the result of the mapped processes of a Higher Education Institution; Management planning and control, Education, Research and Support, and describe how the mapping was performed, working in cross functional teams. Further on we discuss the result ofthe pilot and the plan for implementation.

    Originality/Value of paper - A process-oriented approach in a Higher education institutions, with its complexity, creates opportunities for successful quality assurance and control when having an integrated quality assurance system.

  • 249.
    Lyphout, Christophe
    et al.
    University West, Department of Engineering Science, Division of Production Engineering.
    Nylén, Per
    University West, Department of Engineering Science, Division of Production Engineering.
    Klement, Uta
    University West, Department of Engineering Science, Division of Production Engineering.
    Sattari, M.
    Characterization of adhesion strenght of HVOF sprayed IN718 coatings2009In: Proceedings of th 22nd Internationa Conference on Surface Modification technolgies - SMT22. Trollhättan, Sweden / [ed] T.S. Sudarshan & Per Nylen, VALAR Docs , 2009, p. 11-18Conference paper (Refereed)
    Abstract [en]

    The tensile adhesion strength of thermally sprayed coating is conventionally evaluated via the ASTM C633-69 standard. The maximum measurable adhesion is then limited by the adhesion strength of the polymer media. High velocity oxy-fuel (HVOF) spraying can exhibit very high bonding strength and thus it is essential to develop an alternative method to evaluate coating adhesion strength. In this work a Modified Tensile Adhesion Test (MTAT) is proposed replacing gluing with induction brazing. The method was evaluated for HVOF sprayed Inconel 718 coatings deposited on Inconel 718 substrates. The effect of induction brazing process and the characteristics of the braze-coating interface was given particular interest. The results indicate that the method is superior to the ASTM C633-69 for characterisation of adhesion of coatings with high bond strength.

  • 250.
    Lyphout, Christophe
    et al.
    University West, Department of Engineering Science, Division of Production Engineering.
    Nylén, Per
    University West, Department of Engineering Science, Division of Production Engineering.
    Manescu, A.
    Università Politecnica delle Marche, Ancona, Italy.
    Pirling, T.
    Laue-Langevin Institute (ILL), Grenoble, France.
    Erratum  Residual stresses distribution through thick HVOF sprayed inconel 718 coatings: (Journal of Thermal Spray Technology DOI: 10.1007/s11666-008-9242- 9)2011In: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 20, no 5, p. 1140-Article in journal (Refereed)
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