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  • 201.
    Jansson, Robin
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Konceptframtagning av ett fällbart fäste till underkörningsskydd2014Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Säkerheten i trafiken är ett område som berör näst intill hela samhället. En typ av olycka där antalet svårt skadade har ökat sedan 1980-talet är upphinnande-olyckor. Detta innebär att två fordon som färdas i samma riktning krockar med varandra. Upphinnande-olyckor kan bli extra allvarliga i fallet när en lastbil blir påkörd bakifrån av en personbil. För att förhindra svåra skador i detta fall har kravet om ett skydd längst bak på vissa lastbilsekipage införts. Konstruktionen kallas för ett underkörningsskydd och består, normalt sett, av en skyddsbalk som monteras på lastbilsramen genom en fästanordning. I detta examensarbete presenteras en produktutvecklingsprocess som utförts för en fällbar fästanordning till ett underkörningsskydd. Arbetet genomfördes på VBG GROUP som är en verkstadskoncern inom industrisektorn vars division VBG Truck Equipment levererar utrustning till lastbilar och släp. Syftet var att ta fram ett konceptförslag som uppfyller eller överträffar de grundläggande kraven som ställs på produkten från bland annat lagar, kunder och företaget. Lagkraven innehåller även en kommande ändring för underkörningsskyddets reglemente. Processen genomgick följande moment; litteraturstudie, kravidentifiering, konceptgenerering, konceptselektering, FMEA, DFM samt CAD och FEM. Den valda metoden fungerade väl då den ledde fram till ett resultat som uppfyllde syftet med arbetet. Det resulterande konceptförslaget består av två roterande armar och underkörningsskyddet fälls upp med handkraft samt låses via handtag vid skyddsbalken. Konceptförslagen klarar, i teorin, av de krav det har testats mot. Innan konceptförslaget kan produceras behöver det dels genomgå ett mer ingående detaljkonstruktionsarbete, dels en eller flera prototyp-tillverkningar med tillhörande provning och till sist produktionsplanering och produktions-förberedelser

  • 202.
    Jasim, Mohammed
    University West, Department of Engineering Science, Research Enviroment Production Technology West.
    Failure analysis of suspension plasma sprayed thermal barrier coatings2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Thermal barrier coatings (TBC) are proven to protect the hot section of components operated under elevated temperature. Suspension Plasma Spray (SPS) is an emerging manufacturing process that is used to produce TBCsI, It has the ability to deposit a thinner TBC that has finer microstructure than coatings deposited using traditional Atmospheric Plasma Spray (APS). The coating spray parameters have a significant role in developing the coating properties and thereby the coatings failure. In this thesis work, the parameters such as the spray distance, the feed rate, and the surface velocity were varied to deposit six sets of TBC samples. The as-sprayed samples were analysed and next tested at different temperatures (1000°C, 1050°C and 1100°C) making thermal cyclic fatigue test (TCF) and thermal shock test also known as Burner Rig Test (BRT). These investigations aimed at trying to find an explanation for the effect of each varied process parameter on the deposited TBC. However the cases at 1100°C were not reliable enough to conclude.

    It was found that most porous coating was produced in Run 1. The porosity decreased gradually from Run 1 to the last run (Run 6) by changing the spray parameters. The failure in all cases was mainly due to the Thermally Grown Oxide (TGO) which causes cracking near the topcoat-bond coat interface. According to many cross sectional and top surface morphology SEM images taken during this work, the sintering of TBCs during thermal cycling also played a significant role in the top coat failure.

  • 203.
    Javidi Shirvan, Alireza
    University West, Department of Engineering Science, Division of Mechanical Engineering.
    Modelling of Electric Arc Welding: arc-electrode coupling2013Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Arc welding still requires deeper process understanding and more accurateprediction of the heat transferred to the base metal. This can be provided by CFD modelling.Most works done to model arc discharge using CFD consider the arc corealone. Arc core simulation requires applying extrapolated experimental data asboundary conditions on the electrodes. This limits the applicability. To become independent of experimental input the electrodes need to be included in the arcmodel. The most critical part is then the interface layer between the electrodesand the arc core. This interface is complex and non-uniform, with specific physicalphenomena.The present work reviews the concepts of plasma and arc discharges that areuseful for this problem. The main sub-regions of the model are described, andtheir dominant physical roles are discussed.The coupled arc-electrode model is developed in different steps. First couplingsolid and fluid regions for a simpler problem without complex couplinginterface. This is applied to a laser welding problem using the CFD softwareOpenFOAM. The second step is the modelling of the interface layer betweencathode and arc, or cathode layer. Different modelling approaches available inthe literature are studied to determine their advantages and drawbacks. One ofthem developed by Cayla is used and further improved so as to satisfy the basicprinciples of charge and energy conservation in the different regions of thecathode layer. A numerical procedure is presented. The model, implementedin MATLAB, is tested for different arc core and cathode conditions. The maincharacteristics calculated with the interface layer model are in good agreementwith the reference literature. The future step will be the implementation of theinterface layer model in OpenFOAM.

  • 204.
    Javidi Shirvan, Alireza
    et al.
    University West, Department of Engineering Science, Division of Welding Technology.
    Choquet, Isabelle
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    A review of cathode-arc coupling modeling in GTAW2016In: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669, Vol. 60, no 4, p. 821-835Article in journal (Refereed)
    Abstract [en]

    Material properties of welds are strongly influenced by the thermal history, including the thermo-fluid and electromagnetic phenomena in the weld pool and the arc heat source. A necessary condition for arc heat source models to be predictive is to include the plasma column, the cathode, and the cathode layer providing their thermal and electric coupling. Different cathode layer models based on significantly different physical assumptions are being used. This paper summarizes today’s state of the art of cathode layer modeling of refractory cathodes used in GTAW at atmospheric pressure. The fundamentals of the cathode layer and its physics are addressed. The main modeling approaches, namely (i) the diffusion approach, (ii) the partial LTE approach, and (iii) the hydrodynamic approach are discussed and compared. The most relevant publications are systematically categorized with regard to the respective physical phenomena addressed. Results and process understanding gained with these models are summarized. Finally, some open questions are underlined.

  • 205.
    Jber, Abed Almalik
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Friction Stir Welding Modelling and Simulation: Backing plate material thermal conductivity effect on temperature profile2016Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis presents a FSW modelling of temperature using ANSYS APDL 16.2 (Ansys Par-ametric Design Language). It intends to predict the thermal distribution by taking into ac-count different thermal variation imposed by different backing plate material. The effect on the cooling rate, and peak temperature was studied using finite elements analysis (FEA) tech-niques. For more validity the simulation’s results were compared with temperature data ac-quired experimentally under similar conditions.

    A thermal transient modelling of friction stir welding were developed, by considering a moving heat source was considered. The heat input was obtained from the friction between the tool shoulder with the workpiece in the heat transfer analysis. The heat flux is calculated in the finite element analysis model considering the heat input generation from the tool’s shoulder and probe.

    An accurate temperature measurements during FSW process is a challenging task for ex-perimental measurements since it performed using thermocouples type K that embedded into the workpiece and the (TWT) tool-workpiece thermocouple to measure temperature during FSW.[1]. The peak temperature and cooling rate in different positions were registered for welds using different backing plate materials with different thermos conductivities.

    By the data analysis, it was verified that the backing plate material diffusivity affects the peak temperature and cooling rate. On both, simulation and experimental results, the temperatures were higher when a material with lower thermal conductive was used as backing plate. The experimental results have validated the model, in both peak temperature and the cooling rate.

  • 206.
    Jiang, Janna
    et al.
    University West, Department of Engineering Science, Division of Production Engineering.
    Fasth, Angelica
    University West, Department of Engineering Science, Division of Production Engineering.
    Nylén, Per
    University West, Department of Engineering Science, Division of Production Engineering.
    Choi, W. B.
    Center for Thermal Spray Research, Stony Brook, NY, United States.
    Microindentation and inverse analysis to characterize elastic-plastic properties for thermal sprayed Ti2AlC and NiCoCrAlY2009In: Surface Modification Technologies XXII: Proceedings of the 22nd International Conference on Surface Modification Technologies SMT22 / [ed] T.S. Sudarshan & Per Nylen, VALAR Docs , 2009, Vol. 18, no 2, p. 177-186Conference paper (Refereed)
  • 207.
    Jiang, Janna
    et al.
    University West, Department of Engineering Science, Division of Production Engineering.
    Nylén, Per
    University West, Department of Engineering Science, Division of Production Engineering.
    Object-oriented finite element analysis to simulate microindentation of thermal sprayed MAX-phase coatings2009In: Proceedings - 2009 International Conference on Computer Modeling and Simulation, ICCMS 2009, 2009, p. 337-341Conference paper (Other (popular science, discussion, etc.))
  • 208.
    Johansson, Anders
    et al.
    University West, Department of Engineering Science, Research Enviroment Production Technology West. Global Industrial Development, Scania CV AB, Södertälje, Sweden.
    Nafisi, Mariam
    Mälardalen University, School of Innovation, Design and Engineering, Eskilstuna, Sweden.
    The natural process mapping phenomenon: Resource oriented vs. value flow oriented2016In: The 7th International Swedish Production Symposium, SPS16, Conference Proceedings: 25th – 27th of October 2016, Lund: Swedish Production Academy , 2016, p. 1-6Conference paper (Refereed)
    Abstract [en]

    Lean philosophy has created awareness and eagerness in companies to strive to continuously improve their performance and profitability. This is usually done by improving important and influential core processes since process focus gives the right quality results as well. Thus mapping processes have become more common in recent years. Creating a visual process map is the first step for understanding and improvements.Even though many companies map their processes and try to improve them, they are not always successful.This can be attributed to various reasons, an important one being the perspective from which the process is mapped. The starting point of this paper is that novice modelers naturally model processes from their own perspective, neglecting the goal or the value that the process is meant to achieve. This is demonstrated through simple workshops, at which the participants are tasked to map the “breakfast process”. It is shown in this study that different perspective in the process mapping leads to different process maps and consequently to different process improvement possibilities. Similar experiments are needed to be applied for industrial processes, such as Product Development process or Production System Development process, before the results of the paper can be generalized.

  • 209.
    Johansson, Anders
    et al.
    University West, Department of Engineering Science, Research Enviroment Production Technology West. Global Industrial Development, Scania CV AB, Södertälje.
    Pejryd, Lars
    School of Science and Technology, Örebro University.
    Gustavsson Christiernin, Linn
    University West, Department of Engineering Science, Division of Manufacturing Processes.
    Consideration of market demand volatility risks, when making manufacturing system investments2016In: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 40, p. 307-311Article in journal (Refereed)
    Abstract [en]

    When investing in new manufacturing systems, many aspects must be taken into consideration to ensure a sustainable business. In respect to the financial aspect, both the one-off investment cost and the continuous operational cost must be analysed to ensure that the life-cycle cost perspective is appreciated. However, one detail in the cost analyses that is often overlooked is the composition of fixed and variable cost elements. These details are important to be able to better manage the risk of market demand volatility, and accordingly make appropriateinvestment decisions. This case study demonstrates that when there is a low risk for reduced market demand, investing in a manufacturing system with low variable cost is favourable. However, if there is a high risk for reduced market demand, the importance will instead be to have a low fixed cost, as this will be the dominant cost factor.

  • 210.
    Johansson, Dahniel
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Modulbaserad arkitektur av lyftutrustning med tillbehör2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

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

  • 211.
    Johansson, Dennis
    et al.
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Strömmer, Daniel
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Effektivisera lagerhållningen och införa ett beställningssystem på SI TECH AB2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This Bachelor´s thesis has been performed at SI TECH AB located in Brastad in the municipality of Lysekil during the period January 4, 2014 to April 3, 2014. The purpose of this thesis is to create a number of proposals that could make a warehouse at SI TECH AB more efficient and also improve the material planning. To be able to achieve the purpose of this thesis, four targets were set up which was following:

     Making the layout and structure of the warehouse clearer by labeling the storage locations and create a map that shows all the storage locations.

     Create a model that will make it easier to read and view the stock balance.

     Create an appropriate ordering system by calculating the reorder points.

     Reduce the employed capital by 20 percent and thereby increase the company´s cash liquidity.

    The proposals was based on a theoretical framework which the authors received by studying literature during an early stage of this thesis. Furthermore a baseline survey was carried out at the warehouse to be studied which also worked as a foundation for the proposals. Some of the proposals were implemented practically at SI TECH AB and this created a positive domino effect which led to new proposals during the time of the project.

    The result of the proposals, and the practical work that was carried out, was that the employed capital was decreased and that the storage locations in the warehouse were labeled. Furthermore an ordering system was introduced which visualizes the stock balance as well as the reorder points in a clear way. At the same time it decreases the inventory levels as well as the employed capital

  • 212.
    Johansson, Joar
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Lidell, Anton
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Framtagning av manuell mätprocedur för flygmotordetalj 30k IMC2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The bachelor's thesis work has been situated at one of the workshops at GKN Aerospace Engine Systems site in Trollhättan which produces a specific product, jet engine component 30k IMC. The product is produced in large volumes and the company faces increased volumes in the forthcoming years. The increased volumes mean that the company must re-evaluate their use of resources to secure the capacity to produce according to the demand. They have realized that an existing coordinate measuring machine will bottleneck the production flow and therefor some of its operations have to be relieved.

    The purpose of the thesis work was to free up time in the coordinate measuring machine by removing one of the current operations to enable an increased production rate. A manual measuring procedure was required to remove or eliminate the operation. Therefor an examination had to be done of how the character numbers measured in the measuring machine operation to decide how they could be measured with manual measuring tools. The goal was to achieve the most efficient manual measuring procedure as possible by reducing the number of measuring tools and designing measuring tools that are easy to use and work with.

    The development of the measuring procedure required an analysis of the design drawings to form an understanding of how the character numbers could be verified. Multiple tests of the developed solutions were also required. All proposed solutions of measuring methods were shown and discussed with the concerning detail technician to achieve a good measuring operation. The result is a complete manual measuring procedure for all character numbers currently measured in the coordinate measuring machine. Some of the manual measuring tools are pending manufacturing while others are still only sketches. The proposed solution has been delivered to the concerning technicians and the next step is for a tool designer to model the measuring tools and then order their manufacturing. When the suggestions for the manual measuring procedure was completed, a study regarding the possibilities of three-dimensional optical scanning in the future was performed. When all measuring tools are manufactured a production-qualification is required to then be able to implement the complete solution in the production. Lastly the validity of the chosen methods, choices during the work and estimated economical and productivity effects of the work are discussed.

  • 213.
    Johansson, Johanna
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Kvarnström, Josef
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Konceptutveckling av en komfortabel skyddssko2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Attention has been payed to the fact that incorrectly dimensioned safety shoes might result in injuries caused to the back area, feet and hips. From the recognized problem a goal where established to develop a concept of a new safety shoe with purpose to reduce these injuries. The shoes are intended to be used indoors in settings such as factories. Safety shoes are divided into different standards depending on their functions and this work discusses only the S1P standard. S1P means that the product is equipped with a toecap, closed heel region, antistatic qualities, shock-absorption and penetration resistant together with oil- and petrol resistant sole. The design is intended to be a low shoe model and the development process will end with a final concept that will not be field tested or manufactured. The basis for this work is the product development process presented by Ulrich and Eppinger in their work, Produktutveckling: konstruktion och design. The process consists of following steps: planning, identification of costumer needs, establishing of product specifications, generating of concepts and a selection of one final concept. Recommended by the authors, Ulrich and Eppinger, the method has been modified in order to suit the needs of this work. In the last step, selection of a final concept, two extra steps where added: designand material selection. The method that was chosen to collect the customer needs was a qualitative interview study. The first step was followed by the establishment of a demandslist including their relative importance. With the demands as basis a first product specification was formed including attributes for the futured product. The attributes where assigned values based on a benchmarking process. Followed by the specification was a process where ideas for the final construction where generated and chosen. That step resulted in a variety of concepts which were screened to the final concepts functions. The design was chosen through a voting of among sketches and was followed by the selection of material that were made in the software CES EduPack. The development process resulted in a safety shoe with low weight, satisfying comfort due to its shock-absorbing soles and good ventilation. The BOA®-technique is used as tightening function for simplicity and flexibility. The toecap is perforated in order to reduce weight while increasing ventilation. To ensure that the purpose of this work is being achieved, the product has to reach the market but the goal which was set is achieved due to the concept that was developed. If continued work is of interest the authors recommend fabrication of a prototype in order to enable further analysis of the materials behavior, the constructions strength and the quality of the functions.

  • 214.
    Johansson, Oscar
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Mandaric, Katarina
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Fysisk simulator för produktionsflöden2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This final year project has been carried out at the Production Technology Centre at Innovatum AB in Trollhattan. Aim of the work was to develop a prototype of a concept for a physical simulator for production flows. Based on a core idea of the demonstrator, the goal was to develop a concept in the form of a game, to be used to increase the understanding and illustrate the development opportunities and problems in production flows. Some of the main questions in the thesis are what information is desired to visualize and how can a game for visualization of production flows be built to examine different aspects of the flow. This approach was chosen to be implemented in five phases; clarify the problem, external search, internal search, explore systematic and reflect on solutions and the process. Stage two of the approach was the foundation of information and knowledge that the authors needed to build the study. The theory is based on three main areas which are logistics, Lean, and games and learning. The interviews are conducted with individuals from the private sector and the universities Chalmers University of Technology and University West.

    In the concept development has six sub-problems been identified and to each sub-problem there were a number of solution fragments. In the process of selecting the different solutions that could be used for the prototype, the authors chose to use pros and cons based on the opinions of the authors and primary stakeholders. Other methods used were intuition and favorite products. The authors tested the prototype on two focus groups, through the results the authors could make changes in the soft value and draw conclusions about the concept. A workshop was held with secondary stakeholders in order to analyze and evaluate the concept.

    The prototype is considered to be more suitable for a learning purposes with students as a target group. That is because companies are in need of a demonstrator that is designed with more complexity and opportunities. The authors believe that the concept is worth spending more time and money for to further develop. An app is considered as a good complement to the concept which could be developed and used more extensively.

  • 215.
    Johansson, Pierre E. C.
    et al.
    Volvo Group Trucks Operations, Gothenburg 405 08, Sweden.
    Enofe, Martin O.
    Volvo Group Trucks Operations, Gothenburg 405 08, Sweden.
    Schwarzkopf, Moritz
    Volvo Group Trucks Operations, Gothenburg 405 08, Sweden.
    Malmsköld, Lennart
    University West, Department of Engineering Science, Division of Production Systems.
    Fast-Berglund, Åsa
    Chalmers University of Technology, Gothenburg 412 96, Sweden.
    Moestam, Lena
    Data and Information Handling in Assembly Information Systems: A Current State Analysis2017In: Procedia Manufacturing, E-ISSN 2351-9789, Vol. 11, p. 2099-2106Article in journal (Refereed)
    Abstract [en]

    Products become more complex as the general technology development reaches new levels. These new technologies enable manufacturing companies to offer better products with new functionalities to their customers. Complex products require adequate manufacturing systems to cope with changing product requirements. In general, manufacturing of this type of products entails complex structured and rigid IT systems. Due to the system’s complexity and comprehensive structure, it becomes challenging to optimize the information flow. There are improvement potentials in how such systems could be better structured to meet the demands in complex manufacturing situations. This is particularly true for the vehicle manufacturing industry where growth in many cases have occurred through acquisitions, resulting in increased levels of legacy IT systems. Additionally, this industry is characterized by high levels of product variety which contribute to the complexity of the manufacturing processes. In manual assembly of these products, operations are dependent on high quality assembly work instructions to cope with the complex assembly situations. This paper presents a current state analysis of data and information handling in assembly information systems at multiple production sites at a case company manufacturing heavy vehicles. On basis of a certain set of characterizing manual assembly tasks for truck, engine and transmission assembly, this work focuses on identifying what data and information that is made available to operators in terms of assembly work instructions and the importance of such data and information. This work aims to identify gaps in the information flow between manufacturing engineering and shop floor operations. © 2017 The Authors

  • 216.
    Josic, Petar
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering.
    Järvitalo, Marko
    University West, Department of Engineering Science, Division of Mechanical Engineering.
    Framtagning av analysverktyg för materialförbrukning inom motorunderhåll2012Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The thesis report describes the way of creating an analysis tool for material consumption at the department of engine service at Volvo Aero Corporation. The analysis tool generates average lists and purchase lists for PW100 engine. The documentation of the analysis tool is described in seven parts.

    By using the tool the structural material planner can in an easy manner generate lists that are based on earlier historical data. Instead of creating lists manually the material planner can gain more accurate lists much faster. Previously there were no fact based results in comparison with today.

    Pre studies were made to gain a better insight of the current organization and processes at the engine service department. Interviews with staff as well literature studies in the field of storage and spare parts manage has given possibilities to create an analysis tool. Plan of requirements were created to specify the features of the analysis tool.

    The program Microsoft Access was chosen due to the amout of data to construct the analysis tool. All information was brought from the database SAP. The analysis tool was built in three integrated parts:

    1. Average list: shows the average consumption of material for selected engine and maintenance type.

    2. Stock status: checks the stock for material for selected engine and maintenance type. New and used material is selectable.

    3. Incoming material: shows incoming material that is undelivered for selected engine and maintenance type.

    By these three integrated parts the analysis tool generates a purchase list. The list contains engine type, material number, material description, quantity, price and ABC-classification. By implementing the analysis tool in the daily work purchases will be more accurate. Capital binding will decrease as well.

  • 217.
    Jönsson, Joel
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Westerlund, Isak
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Besluts- och informationsunderlag för lagerhantering: "Plan For Every Part"2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The bachelor thesis was carried out at Parker Hannifin Manufacturing Sweden AB. Parker Hannifin manufactures hydraulic pumps and motors. The assignment was provided by the Supply chain department.

    Parker Hannifin currently has a system for purchased items which contains information about each item. Information obtained from the system is, among other things, batch sizes, delivery times, safety stock, inventory and variance in consumption. The system is called "Plan For Every Part", which is shortened to PFEP. PFEP is a supplementary document to the business system to be used as a decision-making and information base. The purpose of the thesis was to develop and produce an information and decision-making basis which the company should be able to implement. The goal was to design a PFEP for inhouse produced items that should be used for planning, as a decision-making and information base. The PFEP should contain basic information and relevant parameters for each item. If time allows, study material would be created for the relevant staff.

    The research design used was action research, which meant that the problem was solved while the topic was being studied. The course of action was plan, do, study and learn. The thesis includes the first three steps, the fourth step which means learn lessons from the result, will be done afterwards by the company. The methods used in information gathering were literature studies, benchmarking and observation of internal documents. The PFEP was divided into three categories, basic data, parameters and analysis function. The categorization was carried out to distinguish the purpose of the content, but also to get a clearer structure. The design of the PFEP for purchased items was used as inspiration to maintain a uniform appearance. This decision was made because Parker Hannifin works actively with Lean, where standardized working methods are an important part. The PFEP shows, using a comparison of the standard template, that the new calculations increase the stock levels.

    Data used in simulations was taken from three different sources: data obtained from the business system, data retrieved from an old PFEP and estimated values. This affects the reliability because real-value tests would produce a different result. Continued work that Parker Hannifin should carry on, for the PFEP to become a reliable tool, is to insert missing data into the business system. Finally, the goal is assessed to be achieved. However, study material was not created due to lack of time.

    The company is satisfied with the PFEP that has been developed and there will be continued work to make the tool complete.

  • 218.
    Jönsson,, Jonathan
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Persson, Tobias
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Research for a Replacement of the Lube Oil Centrifuge Separation System at Borealis AB2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor's thesis has been carried out at Borealis AB in Stenungsund, Sweden. The report presents a research for a replacement of two centrifuge separators. The separators is purifying the oil that lubricates machinery bearings and regulate the hydraulic control system on the steam powered turbines. These turbines drive the compressors C-1701 and C-1951. The separators installed at Borealis need to be changed because they are end-of-life. They require a lot of maintenance and spare parts are hard to find. An oil separator's task is to separate water from the oil and therefore maintain the quality of the oil. The water can enter the lubricating system from the steam turbines if a seal fails.

    The research started with collecting information about centrifuge separators to understand the principle of the separating method. Other methods for separation of oil and water were investigated to find the most effective, reliable, and most suitable product for the lubricating system. A requirement specification was made to make sure that the final recommended product fulfils all the necessary requirements. The place where the separators are going to be installed is an area where an explosive atmosphere can occur, and therefore there are higher demands on the products.

    A market survey was done, which included benchmarking and contacting suppliers for oil separators. The benchmark was done to see how similar industries with steam turbines solve the problem with water in the lube oil. The turbine manufacture, Thermodyn, was contacted to see what kind of oil separators they recommend for their turbines. Potential products were surveyed based on the benchmarking and the requirement specification. The product selection was made based on a concept screening method that is used in product development.

    The final recommendation was a vacuum dehydration separator from Pall called HXP022. The main benefit with a vacuum dehydrator is that it can remove the dissolved water from the oil, which increases the quality of the oil and therefore decreases the wear on the components. A centrifuge separator only removes the free water from the oil. An alternative recommendation was presented; a centrifuge separator from Alfa Laval, which uses the same method as the old separator at Borealis. The benefit with centrifuge separators is that they can separate water more rapidly than vacuum dehydrators. The final choice should be done by Borealis based on what is more important; separating the water from the oil quickly in case of a large water leakage or increasing the quality of the oil.

  • 219.
    Kalmertun, Filip
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Tallheden, Henric
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    G R&R-studier på manuella och optiska kontrollmetoder2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

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

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

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

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

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

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

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

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

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

  • 220.
    Karimi, Maryam
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Effect of YSZ thickness on the durabil-ity of Gadolinium Zirconate/YSZ double-layered Thermal Barrier Coating2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    7-8 wt. yttria-stabilized zirconia (YSZ) is current standard ceramic material in thermal barrier coating (TBC) applications, mainly in gas turbine engines. However, for high temperature (>1200°C) gas turbine engine operations, YSZ has limitations of poor phase stability and high sintering rates along with its susceptibility to CMAS (calcium magnesium alumino silicates) attack. These challenges effect the durability of TBCs based on YSZ top coat. A wide range of both academic and industrial researches has been done to improve TBC performance by opting for advanced TBC materials and appropriate TBC microstructure. Amongst different proposed materials, pyrochlores have shown excellent properties such as lower thermal conductivity and resistance to CMAS attack compared to YSZ. However, pyrochlores have the drawback of inferior thermo-mechanical properties than YSZ.

    To address this issue, double layered TBCs with YSZ as the base layer and pyrochlores as top layer were proposed to take advantages of high fracture toughness of YSZ and high temperature capability of pyrochlores. In this study, double layer TBC consisting of gadolinium zirconate, Gd2Zr2O7 (here after referred to as GZ), as the top layer and YSZ as the base layer were deposited. Three double-layered GZ/YSZ TBCs with different layer thickness, i.e. 100GZ/400YSZ, 250 GZ/250 YSZ and 400GZ/100YSZ (the prefixed numbers before GZ and YSZ denote corresponding layer thickness in µm) were deposited by suspension plasma spray (SPS). The intention behind varying thickness of YSZ was to alter the fracture toughness at probable failure location of double-layered TBCs (GZ/YSZ interface). The deposited TBCs were subjected to burner rig test (BRT) and thermal cyclic fatigue (TCF) test.

    It was shown that the double layer TBC with lower YSZ thickness had higher thermal cyclic fatigue life and burner rig lifetime (also known as thermal shock lifetime) compared to 100GZ/400YSZ and 250 GZ/250 YSZ. Failure analysis of the TCF specimens and burner rig tested specimens were investigated using a scanning electron microscope (SEM)/energy-dispersive spectroscopy (EDS). The failure modes in BRT were similar for the three double layered TBC variations i.e. at the GZ/YSZ interface. In the case of TCF, failure was observed in the TGO. Porosity analysis and hardness test were employed to compare the sintering behaviour of GZ and YSZ by analysing TBC specimens before and after exposure to TCF test.

  • 221.
    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.

  • 222.
    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.

  • 223.
    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

  • 224.
    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.

  • 225.
    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.

  • 226.
    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.

  • 227.
    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)
  • 228.
    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.

  • 229.
    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.

  • 230.
    Karlsson, Victor
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Product Design for Safer Trampolines in Domestic Use2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

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

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

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

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

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

  • 231.
    Kisielewicz, Agnieszka
    et al.
    University West, Department of Engineering Science, Division of Production Systems.
    Sikström, Fredrik
    University West, Department of Engineering Science, Division of Production Systems.
    Christiansson, Anna-Karin
    University West, Department of Engineering Science, Division of Production Systems.
    Ancona, Antonio
    University West, Department of Engineering Science, Division of Production Systems.
    Spectroscopic monitoring of laser blown powder directed energy deposition of Alloy 7182018In: Procedia Manufacturing, E-ISSN 2351-9789, Vol. 25, p. 418-425Article in journal (Refereed)
    Abstract [en]

    Experimental explorations of a spectrometer system used for in-process monitoring of the laser blown powder directed energy deposition of Alloy 718 is presented. Additive manufacturing of metals using this laser process experiences repeated heating and cooling cycles which will influence the final microstructure and chemical composition at every given point in the built. The spectrometer system disclosed, under certain process conditions, spectral lines that indicate vaporisation of chromium. Post process scanning electron microscope energy dispersive spectroscopy analysis of the deposited beads confirmed a reduction of chromium. Since the chromium concentration in Alloy 718 is correlated to corrosion resistance, this result encourages to further investigations including corrosion tests.

  • 232.
    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".

  • 233.
    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.

  • 234.
    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.

  • 235.
    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.

  • 236.
    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.

  • 237.
    Kristiansson, Lilia
    University West, Department of Engineering Science, Division of Mechanical Engineering. University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and 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.

  • 238.
    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.

  • 239.
    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.

  • 240.
    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.

  • 241.
    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.

  • 242.
    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)
  • 243.
    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.

     

  • 244.
    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.

  • 245.
    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.

  • 246.
    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.

  • 247.
    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.

  • 248.
    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.

  • 249.
    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.

  • 250.
    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.

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