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  • 301.
    Haboush, Wael
    et al.
    University West, Department of Engineering Science.
    Nguyen, Hien
    University West, Department of Engineering Science.
    Förbättringsarbete av färdiglager hos KP Components AB2022Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    This bachelor’s thesis studies how a finished goods warehouse can be improved, and how frequent problems in a company’s warehouse management can be diminished. KPC omponents, a component, and machine part producing company in Uddevalla, has afinished goods warehouse in need of improvement. This project is an improvement work, where the current warehouse management in KP Components is examined and studied. This project also includes a literature study on standardized work improvement, logistics, and warehouse management. Observations of the company’s production hall and interviews of relevant workers have been made. Finally, improvement ideas and recommendations are presented.

    Problems that occur in the finished goods warehouse of KP Components are picking errors and uncertainty in the stock balance. The placement of articles and picking methods are not fully defined and structured. Given these occurring problems, this study formulates the following questions:

    • How can the occurring problems be minimized or eliminated?

    • What system can support KP Components in increasing the effectiveness of its warehouse management? SWOT-analysis are used to compare the different principles of article placement and picking methods, which made the selection of improvement ideas possible.This study concludes that KP Components should implement the family-based, size, and similarity principles regarding article placement. The company should also use the bar code reader as a picking method. It is furthermore recommended that KP Components should not yet implement a warehouse management system (WMS) and that the warehouse layout should not be replaced.

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  • 302.
    Hadzic, Mirella
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Stridsberg, Louise
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Tejp som kraftöverförande fogmetod: en kartläggning2018Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

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

  • 303.
    Hagebrand, Pauline
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Stern, Carl
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Utveckling av ny station för pressning och delmontering2022Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor's thesis has been carried out at Parker Hannifin's facility in Trollhättan throughout the course of ten weeks between January and March 2022. Parker has identified the possibility of reducing the number of operations, increase the degree of standardization as well as facilitate the workload in the assembly that manufactures variable hydraulic motors. This is done by performing a transfer of an assembly operation to the shaft group where unused work capacity has been identified. The assembly is not developed at a pace that is in line with the development in the rest of the business in terms of quality, ergonomics, and productivity. This also applies to operation that is planned to be moved to the shaft group. To be able to carry out this move, an additional press needs to be procured and a new ergonomic, safe, and quality-assured workstation designed.

    Literature studies are done to obtain data on ergonomics and press systems, which is used as a starting point when designing the new press with the associated workstation and working methods. The search for information is done by performing observations and interviews to create a picture of the current situation. The work also includes a survey of the material flow where interviews and observations are used to investigate how the material is delivered to the workstation. Ergonomics are analyzed using the Swedish Work Environment Authority's risk assessments and the Humantech software. The tool FMEA, is performed to identify risks in the assembly both before and after the operation is moved. Concept generation and concept selection are both part of the generic product development process, which is used as a method to develop ideas for solutions when designing the new press with the associated press fixtures as well as working methods for the new workstation.The result is an ergonomic and safe workstation that is expected to manage the demand for shafts for the next nine years. The new press is estimated to reduce the cycle time from 70 to 50 seconds per shaft.

    The result of this thesis is considered to achieve the goals since the productivity and ergonomics for the assembly operation has improved along with it being quality assured. This thesis does not present a specific model of a press to the workstation due to lack of time, but Parker is provided with the basis needed for the purchase of a new press for the developed concept.

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  • 304.
    Haghnegahdar, Nima
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Lövholt, Tobias
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Faktorer som effektiviserar digitala möten vid lärosäten2021Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Due to Covid-19, large parts of Sweden's universities and companies have chosen to introduce digital meetings. Even before the pandemic, digital meetings were a topical issue because several organizations have sustainability goals increase travel-free meetings. Although the benefits of the digital meetings are many, there are also factors that contribute to meetings becoming less efficient digitally. Both communication and social interaction deteriorate with the digital meetings. The purpose of the study is to investigate which factors contribute to digital meetings becoming effective for students and staff at higher education institutions.

    The study method is based on grounded theory and studies of relevant literature in the field. It is a qualitative study that investigates how higher education institutions can achieve effective meetings. Grounded theory means that data collection, selection, and analysis of data is repeated several times. The process continues until saturation occurs. Grounded theory is an interactive process where data collection and analysis interact during the entire process.

    The study observed four different factors that can help higher education institutions conduct more effective digital meetings. For a meeting to be effective, the right conditions must be in place. The study shows that problems with the user-friendliness of e-tools are important and an improvement proposal is to create a user-friendly interface. Researcher Linn Gustavsson Christiernin has developed a method which shows that the right functions are selected for the right user groups, which creates user-friendliness. The study also discusses the help of technology in the digital meeting, which can create more effective methods to perform practical steps and explain complex problems.

    For a complementary picture of the study area, interviews and observations can be performed at digital meetings. Several higher education institutions have conducted student §surveys, which has created insight into students' position on the questions asked in the survey. A broader perception is created if students can speak more freely during interviews and not answer leading questions. 

  • 305.
    Hagqvist, Petter
    et al.
    University West, Department of Engineering Science, Division of Automation Systems.
    Christiansson, Anna-Karin
    University West, Department of Engineering Science, Division of Automation Systems.
    Heralic, Almir
    GKN Aerospace.
    Automation of a laser welding system for additive manufacturing2015In: Proceedings of the 2015 IEEE International Conference on Automation Science and Engineering / [ed] Kazuhiro Saitou, Univ. of Michigan, IEEE, 2015, p. 900-905Conference paper (Refereed)
    Abstract [en]

    This paper presents the benefits and challenges ofusing a standard robotised laser welding cell for additive manufacturing(AM). Additive manufacturing, sometimes denoted3D-printing or rapid prototyping, has lately met strong interestin several areas of society, and a variety of technologies andmaterials have been in focus. The current paper summarisesautomation efforts for AM of advanced aero engine componentsusing high power laser with welding optics as power source formelting metal wire and using an industrial robot for obtaininga 3-dimensional feature shape. The challenges are related to theprocess itself encountering high and repeated temperatures withmelting and solidification of the metal as the main players. Themajor research solutions discussed in this paper are relatedto automation issues for obtaining a stable process and tohave control of the temperatures and temperature changes thatthe metals encounter during the process. The solutions aresuccessfully implemented in an industrial laser welding cell.

  • 306.
    Haj-Bolouri, Amir
    et al.
    University West, School of Business, Economics and IT, Divison of Informatics.
    Rossi, Matti
    Information Systems, Aalto University, Espoo (FIN).
    Towards Design Principles for Safety Training in Virtual Reality: An Action Design Research Case2021In: Lecture Notes in Computer Science, ISSN 0302-9743, E-ISSN 1611-3349, Vol. 12807 LNCS, p. 89-95Article in journal (Refereed)
    Abstract [en]

    Virtual Reality (VR) technology has progressed and become viable for the purpose of education, learning, and training. Organizations adopt and employ VR technologies to enhance employees' skills, competency, and readiness through safety training that prepare the employees towards work-specific situations that are dangerous, hazardous, and uncertain. This research in progress paper reports early results from an Action Design Research case on VR safety training. The empirical work of this study is on-going and is set in the domain of rail industry. Early results are reported as tentative design implications for safety training in VR, which are based on a first round of data analysis. The implications are proposed with the ambition of extending them into design principles for safety training in VR. Subsequently, steps for future research are outlined and discussed to advance the design implications into principles.

  • 307.
    Hall, Maria
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Henriksen, Sara
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Identifiering av mätetal för att öka effektiviteten inom inköp2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis is performed at GKN Aerospace Sweden AB (GAS) in Trollhättan with purpose to map the purchasing process and find indicators to make the process more efficient. The target is that by the end of March 2016 to be able to determine if the efficiency of the purchasing process can be measured. The thesis has been limited to find metrics for the purchase of production materials and delimited to map the purchasing process from "purchase requisition" to stock. The thesis is a qualitative study and has been carried out through interviews, observations, benchmarking, concept screening and mapping in terms of a BPI-workshop. During the BPI-workshop a number of roles in the process participated to map the "current state", which contained 38 wastes. Based on the "current state" 15 improvement proposals was generated which GAS should implement to achieve "future state". If the proposed improvements are introduced the lead time for the process is expected to reduce from 96 to 42 days.Of the three companies that were visited during the study none of them had metrics for how efficient their process is. The companies including GAS only had measures for how well the suppliers are performing and other measurements for the internal process. The conclusion is that it is difficult to find a single metric that can represent the efficiency of the entire purchasing process, because of its complexity that is influenced by many factors. The only metrics the students suggests GAS to measure for the defined process is: Number of incorrect purchase requisitions The metric does not measure how efficient the process is, the metric will only measure how often errors occur which creates an inefficient process. In order for the metric to be relevant GAS need to implement the proposed improvements that were generated during the BPI workshop.The metric should be measured before and after the implementation of the improvement proposals to achieve the desired effect. Besides this metric, the students suggest GAS to measure the following metrics to eventually get an efficient process: Continuous improvement purchase Finally GAS is urged to continue to implement BPI-workshops for other parts of the purchasing process to identify wastes that are not discussed in this thesis.

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  • 308.
    Hallqvist, Alexandra
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Effektivisering av genomloppstid inom termisk sprutning2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

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

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

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

  • 309.
    Hallström, Kristoffer
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Olofsson, Björn
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Förslag på utformning av en monteringscell för att öka produktionskapaciteten: för VP1-pumpar på Parker Hannifin AB2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This work has been carried out at Parker Hannifin in Trollhättan and is describing concept work for design proposals of an assembly cell in which a hydraulic pump is produced. The current assembly cell does not have a high enough capacity to meet a rising demand. The aim of this work was to propose a balanced assembly cell whose capacity increases with increase in the workforce. The goal was to present a model of an assembly cell that can achieve a production capacity of at least 200 pumps per week.By observing the current assembly, and study the various operations time duration, different time balancing charts were created. Unlike the current time balancing charts the operations for calibrating and controlling the pumps functions in a test rig were now included. Various concepts were created and discussed with stakeholders and were followed by revisions of the concepts before a screening. The concepts were screened down to two concepts, which were modeled in full scale to allow for evaluation according to the working method Production Preparation, 2P. After that, a concept point matrix was created and the concepts were rated with the use of the evaluation of the models.The concept recommended to Parker is called "Two-sided assembly" and is a concept where the majority of the sub-assemblies for building a VP1 pump is made on one side and then transported on a roller conveyor to the other side where a smaller amount of sub-assemblies is made to be followed by the final assembly.The concept with the examples of time balancing charts results in a production capacity of 227 pumps per week. The concept is flexible and can be adapted to several workflow standards and there is potential for further development if the concept is deemed suitable to implement by Parker.

  • 310.
    Halmsjö, Jesper
    et al.
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Hansen Andreasson, Karl
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Påläggssvetsning av kylturbulatorer med kall metallöverföring2014Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Siemens Industrial Turbomachinery in Trollhättan, Sweden, manufacture combustion chambers for gas turbines. One of the most important products is the combustion chamber of the SGT-800 gas turbine. Cooling ribs are currently machined out of the combustor casing. Their purpose is to cool the construction by generating turbulence from the air flow.

    Siemens want to investigate the possibility of replacing the current manufacturing method with an additive manufacturing method. This study focuses on investigating the possibility of utilizing Cold Metal Transfer technology (CMT). CMT is derived from MIG/MAG and offers a lower heat input and splatter free welds. An implementation of CMT-technology would theoretically lead to reduced lead- and transport times as well as cost savings.

    A quantitative study involving CMT-welding was carried out at PTC, Trollhättan. The aim was to create welded ribs of a certain geometry and size. Factorial design of experiments was used. Regression models of how welding parameters influenced the height, width, angle, penetration and heat transfer of the welded rib were created. The regression models were based on the results of the experiments. Optimization of the process led to ribs with good metallurgical properties, free from cracks and lack of fusion. The dimensions were within the required limits. The optimized process was used to weld a zigzag pattern, which is believed to enhance the level of cooling. All experiments were limited to flat surfaces 

  • 311.
    Hamatuli, Cliff
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Skräddad mikrostruktur av gadolinium zirkonat baserade värmebarriärbeläggningar som utsätts för termisk cyklisk utmattning2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Yttria Stabilized Zirconia (YSZ) is the standard ceramic top coat material used for TBC application. Above 1200°C, issues such as CMAS (Calcium Magnesium Alumino Silicates) infiltration susceptibility, phase instability and high sintering rates limits its long durability. Therefore, new materials which can overcome these challenges without compromising the other requirements for TBCs are highly desirable. Gadolinium zirconate is one such material which has shown promising results for CMAS infiltration resistance. In this work, a relatively new TBC processing route, suspension plasma spray (SPS) has been employed to deposit gadolinium zirconate based TBCs. The primary aim of this study was to deposit two different coating systems (layered and composite) of gadolinium zirconate and YSZ composition using SPS technique and evaluate their thermal cyclic fatigue life performance. The layered system was a triple layered TBC with YSZ as the base layer, relatively porous GZ as the intermediate layer and dense GZ as the top layer. The blended TBC system comprised of a thin YSZ layer, an intermediate GZ+YSZ thick layer and dense GZ top layer. In the thermal cyclic fatigue test at 1100°C and 1200°C, it was observed that blended TBC had a lower thermal cyclic life than the layered TBC. It was shown that SPS is a promising technique to deposit columnar microstructure TBCs. 

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  • 312.
    Hamid Elamin, Hamed
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Mohammad Taher, Handrin
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Utveckling av en skopkonstruktion med lägre produktionskostnader2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis is about the development of a bucket design; intended for a range of excavatorbuckets consisting of four different types, but has only been implemented on the cablebucket. The work has been performed on behalf of a company that develops, produces andsells construction equipment for excavators and wheel loaders. At the present, the company'sexcavator buckets have high production costs, but the vision is to get into the low-costmarket. The goal of this work has been to develop a bucket design that reduces the company'sproduction costs.After a meeting with the company it became clear what needed to be achieved. The collectedneeds were interpreted in terms of customer requirements. A QFD was made, and thecustomer requirements were translated into product specifications for a successful bucketdesign. Particular focus has been put on simplifying the assembly of the bucket and adaptingits design for robot welding. Some essential factors have been to design interactingparts and to consider the accessibility for welding. The concepts were generated throughinternal and external searches, where methods as brainstorming and competitor analysiswere used.Concept selection was made by using Pugh's decision-matrix. A relatively optimal conceptwas selected for further development. During the development, various verification methodswere used, as for example risk analysis, finite element analysis (FEA) and cost estimate,to verify that the selected concept meets the set requirements for the excavator bucket.Several potential improvements were identified during the verifications phase and theseimprovements were implemented on the selected concept, which resulted in an even betterconcept than before.The final concept obtained a reduced production cost, with a more efficient assembly, reducedmaterial use and welding as well as a better performance than before.

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  • 313.
    Hansson, Anders
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Detection of tool wear in drilling based on axis position signals2016Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Cutting operations are important and commonly used operations in the field of manufacturing. Automated machining is today commonly used in CNC-machines. One common drawback with automated machining is that the tool condition is challenging to predict which leads to a conservative tool replacement times. This leads to a low utilisation of the tool economical lifetime and an unnecessary high number of tool replacements. Methods for indirect continuous monitoring of the tool wear exist but usually require retrofitting of external sensors that can be both costly and also interrupt the machine operation due to the additional wiring. It is therefore of interest to investigate the possibility to use the, often high resolution, sensors already fitted in a CNC-machine to extract valuable data that can indirectly give an estimation of the tool condition.

    This thesis work has, with attention to the X-, Y- and Z-position sensors, resulted in development of algorithms that show relations between tool wear and data acquired from these sensors. The algorithms operate in the frequency domain to determine changes in the dynamic response over the time of tool degradation.

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  • 314.
    Hansson, Anton
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Blom, Daniel
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Handling derivative CAD data containing Model based Definition2020Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report is about how model based definition (MBD) and model based enterprise (MBE) are advancing in the technical industry. It will replace the old method of using drawings to use 3D models with measurement, which then can be used downstream in the companies. For this to work in a world with several different software manufacturers there is a need to use neutral file formats. GKN is a company that has worked model-based for 5-10 years and is now aiming to apply this in their downstream manufacturing. The problem is that suppliers and other companies do not use the same CAD program or the same versions of the program, which in GKN's case is NX 12.0.2. So when sending or receiving files it must be converted to a neutral file format that all CAD programs can open, it is during the process of loss of information which means that it is not possible to apply MBD in MBE that GKN strives to do. This project study what losses can occur, how to design models in a way that avoids errors, which neutral file format is best suited for GKN today and what the future might look like. File formats examined are Prt created by Siemens NX, JT and STEP AP242 which are both neutral file formats, Catia and QIF. The work started with investigating GKN's known cases where errors and information loss occurred and based on it read what was to be prioritized. In that investigation it was discovered that it was product manufacturing information (PMI) that disappeared mainly during the conversion.   The method was to test and troubleshoot different models in NX 12 and then note the deviations that occurred. To perform a test a model was taken in its original CAD file, which in NX cases is Prt. It exported to, for example JT, and then compared the models to analyze if there were any differences. Test models were provided by GKN, but models were also created to simulate as many errors as possible simultaneously. After the troubleshooting was completed, the process of investigating whether there were any solutions to the errors found or whether it was possible to avoid them was begun. Faults could be that set dimensions were assorted or disappeared from the model, notes have changed font or size, cannot see sections etc. Errors that could not be resolved or bypassed led to contact with Siemens which replied that the errors were corrected in newer NX versions and shared the latest version of the CAD program, NX 1926. In the newer version, information that NX 12 failed to convert was converted.To examine Catia files, a software called Glovius was used, it was created to be able to visualize all types of file formats but also to export to neutral file formats. There were no errors during the visualization of Catia, but when the file was exported to STEP information loss was detected. The same result was given when Prt was exported to JT. But the fact that Catia could be exported to STEP gave it the opportunity to open it in NX. QIF is a file format that could not be tested practically but instead a theoretical study was performed. It should be able to be used for both NX and Catia and the company that developed it believes that all information will follow along during the conversion. The results of the survey indicate that at present there is no neutral file format that can export all information so that MBD can be applied in MBE. After all tests, JT is the format that currently manages to export Prt files with the least information loss but that this is a process that works with continuous improvement and therefore work much better in the future.

  • 315.
    Hansson, Hedvig
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Karlsson, Mattias
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Review of stable gas and its safety applications2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

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

  • 316.
    Hansson, Jonas
    University West, Department of Engineering Science.
    Integrated Management Systems – advantages, problems and possibilities2010In: 13thToulon-Verona international quality conference. 2-4 sept, 2010: Organizational Excellence in Service, 2010Conference paper (Refereed)
    Abstract [en]

     Effective management in the globalized world requires an effective, efficient and flexible management system. Effective could be interpreted as addressing all relevant stakeholder concerns in a context of Corporate Social Responsibility (CSR). Efficient would mean that it does the job with low resource use. Flexibility requires that changed conditions and new requirements easily can be included. Many organizations are already working with Integrated Management Systems (IMS). Interesting questions are to what extent current integration covers the above mentioned needs and if not what changes are needed. This conceptual paper looks at the advantages and problems of integration. Possibilities for development of fully integrated management systems are studied from the perspective of managing stakeholder needs, with the forthcoming ISO 26000 – “Guidance on social responsibility”, as inspiration. Results show that there are advantages in integration, but that the scope and level of integration often is limited. A conceptual model for integrating all stakeholder needs in value networks is presented.

  • 317.
    Hansson, Jonas
    et al.
    University West, Department of Engineering Science, Division of Process and Product Development.
    Klefsjö, Bengt
    Luleå University of Technology, Division of Quality and Environmental Management.
    Sustaining quality management implementation in small organisations: Experiences from quality award recipients2008In: International Journal of Management Practice, ISSN 1477-9064, Vol. 3, no 1, p. 31-50Article in journal (Refereed)
  • 318.
    Hansson, Marcus
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Förstudie för implementering av planeringssystemet Demand Driven Material Requirments Planning i X-verkstaden på GKN2020Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor thesis is performed in collaboration with GKN Aerospace Sweden AB in Trollhättan. With the ambition to streamline a production processes in one of the workshops (X-workshop). The objective with the work was to clarify the pros and cons with DDMRP. What presumption GKN have for an implementation, what is required for an implementation and what they have that supports a transition towards DDMRP. The work follows three iterations of a PDSA-cycle and the data collection methods used are litterateur study of the methodology functions, pros and cons with it and interviews to understand the situation of the X-workshop and with staff that have experience with DDMRP at GKN. The theory of DDMRP involves protection of the production processes against variability by strategically positioning buffers. The outcome of the thesis conveys in an analysis of the answers form the interviews. With help from the interview answers and the theory, the metrics of the product Genx was elected to perform a theoretical analysis upon. The theoretical analysis was compiled by following the manufacturing quality requirement of a product down to operational level. It was noticed at operational level that operation 300 and 800 had long queuing times, variability in operation times and that they are positioned before respective after operation 500 which has capacity constraints. Recommendation, is to place a buffer near operation 300 and 800 to uphold the production process.The analysis ends with what supports a transition to DDMRP for the X-workshop and what they need to oversee in the case of an implementation of this methodology. The discussion describes the results from the interviews are regarded specifically for the organization and the environment at GKN X-workshop. What speaks for an implementation of DDMRP is that the methodology is possible to run in parallel with others planning methodologies.

  • 319.
    Hansson, Mattias
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Palmgren, Mats
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Product Development: Steering solutions for Easy Boating2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor's thesis consists of a product development project performed for Volvo Penta's transmissions department. In line with Volvo Penta's vision of Easy Boating, the problem description entailed, to make boating easier by developing concepts for the steering of boats. The goal was to develop three concepts which suited the requirements provided by the project owner. The bachelor's thesis was preceded by a study, in the form of a concept generation process. The project was initiated with a concept generation process, in parallel with a requirement analysis. This concept generation was performed with the assistance of tools from the Teoriya Resheniya Izobretatelskikh Zadatch (TRIZ) methodology. Utilised parts from TRIZ are tools for identifying free resources, finding and resolving undesirable contradictions and predicting the next step of development of a system. In accordance with the methods of Set-Based Engineering, the generated concepts were not chosen for their merit, but instead eliminated based on requirements and developed knowledge. To accomplish this, the requirements were collected from the identified stakeholders of the project and ranked based on their respective weight. The requirements were used in the elimination of the concepts which was performed in three stages: pruning of concepts, concept screening and ultimately, concept scoring. These three stages were based on the literature and chosen because of their ability to incorporate the requirements in the elimination. As a result of the elimination process six concepts of two different product categories, addons to existing solutions and complete new systems, were presented to Volvo Penta in combination with a product development plan. The result of six concepts was obtained since none of the concepts categories could be eliminated by the requirements collected in the process and therefore it was decided to present tree from each category.

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  • 320.
    Hansson, Niklas
    University West, Department of Engineering Science, Division of Production Systems.
    Modelling of production flow at Siemens Energy: Digital twin with plans toward statistical process control2021Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The reason for this thesis’ initialisation was that Siemens Energy Trollhättan wanted to take their manufacturing production a step further into Industrie 4.0. This process was to begin with a simulated model of part of their factory being built, which could then later be turned into part of a Digital twin with an alarm functionality that could help optimise production. This thesis will focus on these first steps taken to have a Digital twin of the factory, made together with a theoretical research part regarding how this alarm functionality can be realized. A solution found by the author was sending data from the program Plant Simulation to the computational platform MATLAB, wherein statistical process control is utilised to trigger an alarm when the monitored mean goes beyond acceptable limits. The theoretical research regarding requirements of implementing real time data in a Digital twin is handled in the partnering work to this one written by Nyberg [1].

    The simulation model built during this degree work in the end one included of the initially six suggested productions regarding the BK800 combustion chamber, the scope of which had to be decreased due to time constraints. Data has been analysed and structured so that further expansion of the model has been prepared and simplified for the future modeller tasked with continuing work on the thesis’ model. The model has been validated to have within five percent throughput as compared to current data and it was agreed that the model is behaving within expected limits when compared to what Siemens sees in their factory today.

    Once validation was confirmed it was time to perform experiments on the simulation model. Of these experiments, one of the most interesting parameters tested was increasing how many source parts are initialised into the system at once. This initially began with increased model throughput, but once new parts rate reached a certain value this led to a decrease in model throughput. This is thought to be because of too many products in the flow leading to bottlenecks forming. Other parameters that were tested and changed were storage sizes, scheduling of workers, sick leave percentage and number of workers. The parameters with the greatest effect on model throughput were increased incoming parts and changed scheduling for workers. The other parameters had minimal effect on model throughput. One of these, sick leave percentage, had minimal effect on the modelled factory’s efficiency. This was surprising since the Siemens factory has a majority of manual labour in the factory today, which would lead to a more noticeable decrease in production if even one worker was sick in the actual factory. Sick leave’s minimal effect is however thought to be due to the model encompassing a fairly small part of the factory when these experiments were performed. A solution for implementing the requested alarm has been researched and a concept of how this would be extended is outlined in this thesis, though the implementation of the solution itself fell outside of the timeframe of this degree work.

  • 321.
    Hansson, Tobias
    et al.
    University West, Department of Engineering Science.
    Skogsberg, Kristoffer
    University West, Department of Engineering Science.
    Comparison of stress behaviour in thermal barrier coatings using FE analyses2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The objective of this thesis project was to compare the stress behaviour in thermal barrier coatings (TBCs) with FE analyses in both 2D and 3D. The main focus was to analyse the vertical stresses in the topcoat (TC) and how they varied in relation to different thicknesses of the thermally grown oxide (TGO), spraying methods of the bondcoat (BC) and the topography of the BC.

    For the 2D simulations six samples were used; three with BCs sprayed with high-velocity oxy-fuel spraying and three sprayed with atmospheric plasma spraying. The samples had been exposed to isothermal heat treatment at 1150 °C for 0, 100 and 200 hours. Five images of each sample were taken with a scanning electron microscope, resulting in a total of 30 images. FE simulations based on these 30 images were done simulating a cooling from 1100 °C to 100 °C.

    The 3D simulations were based on surfaces created from coordinates measured with stripe projection technique on three samples consisting of only substrate and BC. Three domains of each sample had been measured and three CAD models based on randomly selected surfaces of each domain were made, resulting in 27 CAD models. The CAD models were used in the 3D FE simulations also simulating a cooling from 1100 °C to 100 °C.

    The results showed that the 2D simulations corresponds to published assertions about a stress inversion after TGO growth and that cracking will propagate from one peak to another, presuming the roughness of the TGO can be expressed as a wave. No conclusions of differences between spraying methods of the BC could be drawn.

    The stress inversion phenomenon was also found in the 3D simulations. By inspecting the TGO/TC-interface profile in different sections of a 3D model, difficulties in predicting the stress behaviour in a TBC with 2D were explained. No differences in stresses in relation to the BC roughness could be stated.

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    Comparison of stress behaviour in thermal barrier coatings using FE analyses
  • 322.
    Haraldsson, Jenny
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering.
    Karlsson, Christian
    University West, Department of Engineering Science, Division of Mechanical Engineering.
    Ersättning av skruvförband till VE152012Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Fordonsindustrin strävar efter ständiga förbättringar på transmissionssystem inom exempelvis hållfasthet och viktminskning. För att reducera vikten på växellådshuset (VE15) har alternativ till det befintliga skruvförbandet granskats. Målet med examensarbetet var att välja två olika fogningsmetoder, en inom svetsning och en inom limning. De valda fogningsmetoderna jämfördes med det befintliga skruvförbandet utifrån bland annat viktminskningspotential och hållfasthet.

    Information inom svetsning, limning, skruvförband och aluminium införskaffades med hjälp av kvalificerade databaser, vetenskapliga artiklar samt rådfrågning av sakkunniga inom respektive område. Utifrån de valda fogningsmetoderna, friktionsomrörningssvetsning (FSW) och epoxi, idégenererades utformning av flänsen.

    Vid användning av FSW som fogningsmetod reducerades vikten på VE15 med 13,7 % och med epoxi var viktminskningen 25,5 %, i jämförelse med skruvförbandet. Då mekaniken i växellådan genererar krafter på flänsen är hållfasthetsegenskaper hos fogningsmetoderna viktiga. Epoxi, FSW och skruvförbandet klarar belastningarna med god marginal. Med avseende på bland annat hållfasthet, vikt och miljö/hälsopåverkan valdes FSW som potentiell ersättare av skruvförbandet på VE15. Valet utfördes med en konceptvägningsmatris.

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  • 323.
    Harati, Ebrahim
    et al.
    University West, Department of Engineering Science, Division of Manufacturing Processes.
    Malek Ghaini, Farshid
    Tarbiat Modares University,Tehran.
    Torkamany, Mohammad Javad
    Tarbiat Modares University, Tehran.
    Microstructural Analysis of Laser Cladding of Stellite 6 on Ductile Iron2014In: Proceedings of The 6th International Swedish Production Symposium 2014 / [ed] Johan Stahre, Björn Johansson,Mats Björkman, 2014, p. 1-8Conference paper (Refereed)
    Abstract [en]

    Stellite 6 alloy in the form of powder was deposited on a ductile cast iron substrate using a low power pulsed Nd:YAG laser. The effects of process parameters on the resulting microstructure and hardness were studied with emphasis on the single and multi-track deposits. The results revealed that the cladded layers consist of carbides dispersed in a Co-based solid solution matrix with a dendritic structure. Multi-track cladded layers have coarser dendrites compared to those of single-track cladded layer due to a longer exposure time at high temperature and slower cooling rates as more layers were deposited

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  • 324.
    Hardan, Salem
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    AL-Rumaiss, Hussain
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Simulering av produktionsflöde före produktionsökning i Volvo Penta, Varafabriken2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Volvo Penta, Varafabriken has planned to close by the end of 2019, another engine variant under the name Compact Engine will begin to be produced in the factory. According to the plan, the number of engines to be produced is estimated at seven hundred engines. This means that the plant will produce three to four engines daily of this variant. The new engine will use the same flow as three other engines already produced in the factory. The new Compact Engine variant has undergone a major change before production, which means that more than 80 percent of the included parts were changed for the purpose of achieving higher performance, reducing emissions and increasing reliability in maneuvering. The motors manufactured in the current production flow are used almost entirely in boats and the new variant has sailboats as a target group.

    The engineering department responsible for the planning and implementation of the production wanted the project work, which is reported in this paper, to analyze the flow and carry out a simulation project to map the maximum capacity of the system in the form of manufactured engines and to predefine batch sizes for the plant if the production pattern for upcoming engine variants into the flow can affect production capacity. The latter goal for batch sizes has been a secondary target that is desired if the time is enough and it did. The project team has never used the software, FACTS ANALYSER, which the factory uses as a simulation system.

    The project resulted in the production inflow two being able to increase the number of engines produced by as much as 35.29 percent. The simulation showed that the number of motors produced would increase from 34 to 44 engines per shift, which is an increase of 12 engines per shift. The simulation also showed that the bottleneck would occur at Station 835, but that the painting with its components, robots, and the furnace had the highest utilization rate of 90.3 percent.

    After analysis of the result, one could draw a conclusion that the painting can appear as a future bottleneck if Volvo Penta decides to reduce the processing time at Station 835 which is assumed to be the bottleneck by, for example, that more operators can be supplied to reduce the processing time. A simulation with changed batch sizes was run and showed no differences in the TH value.

  • 325.
    Harish, Prakruth
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Understanding the Effect of Isothermal Heat Treatments on Microstructure of LMD-w Titanium Alloy (Ti-6242) - As-Built microstructure2020Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The most widely used titanium alloy in the hot sections of a jet engine is Ti-6Al-2Sn-4Zr-2Mo (Ti-6242) and with the technological advancements additive manufacturing (AM) of Ti-6242 is of great interest. Although, there is not much published related to additively manufactured Ti-6242. The project aimed to provide an experimental input for simulations of additively manufactured,laser metal deposited–wire (LMD-w) of Ti-6242. The main part of this project has been to experimentally study the effect of isothermal temperatures and holding times on the microstructural changes in as-built Ti-6242 on Ti-64 base-plate. The evaluation of micro-structural changes with isothermal temperature, holding time and cooling rates on Ti-6242 are quantified in terms of alpha laths, phase fraction by using MIPAR (image analysis software) and preliminary determine mechanical properties by performing hardness tests.The microstructures obtained through a process are highly dependent on the thermal history is it exposed to and the mechanical properties are determined by the microstructures present. In this thesis work the alpha lath thickness and the hardness of the material increases with increasing isothermal temperature. From the phase fractions obtained forthe heat treated samples an equilibrium phase diagram and a TTT diagram is plotted for as-built microstructure.

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  • 326.
    Harrison Nwabuisi, Emeka
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Investigation on Chip Morphology and Breakability in Cryogenic Machining of Aluminium Matrix Composite2021Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Machining of aluminium matrix composites such as aluminium silicon carbide are difficult due to the presence of hard and abrasive particles of silicon carbide which causes tool wear, poor surface quality and undesirable chip formation. This work contains the study of the influence of cryogenic assisted turning operation on chip morphology, chip breakability and control on aluminium silicon carbide using uncoated tungsten carbide tool and liquid nitrogen as coolant.

    It further made comparison between the results obtained from dry machining with that of cryogenic machining based on these areas of interest. Microstructural analysis of the chips obtained from the dry and cryogenic machining was performed using the light optical microscope and scanning electron microscope. Measurements of the chip thickness, chip width, tool-chip contact length, average chip length and average chip curl diameter was performed to provide insight on the chip breakability process.

    Results obtained showed that chip width and thickness varied as the speed varied but did not contribute to the chip breakability. It showed that chip breakability mainly depends on the chip curl diameter and average chip length across the four-cutting condition. Observation of the rake cooling condition gave a lower chip curl diameter, favourable average chip length and short non-helical chips which are more favourable to chip breakability.The influence of the cryogenic on the chip morphology was evident in the sharp difference between the long continuous chip of the dry machining with that of the short continuous chips from the other three cooling condition, the cryogenic cooled operations formed short segmented continuous chip with some presence of micro cracks, fractures towards the chip root and delamination on the outer side of the chips which can be point of crack and stress propagation.

    In conclusion, cryogenic cooling influenced the chip morphology and enhanced better chip breakability of aluminium silicon carbide especially when applied from the dual and rake face.

  • 327.
    Harrysson, Emma
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Jonsson, Caroline
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Förbättring av Wargön Innovations returhantering för textilier2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Wargön Innovation is a company that works with sustainability projects, mainly within textiles. One of the projects is WargoTex Development that aims to develop the opportunities to make use of textiles. For Wargön Innovation, the project makes it possible to assist the stores of second-hand clothes by sorting donated clothes in categories of sale and recycling. The company aims to create an industrial process to sort textiles with the possibility to increase the volume of textiles per year. In this thesis the current situation of Wargön Innovations textile sorting chain will be mapped to develop suggestions for how to increase the efficiency and the volume of sorting textiles per year. The work began with interviews, observations, and calculations of the capacity and was used to chart the current situation. Based on the current situation, variation and activities that create value in the process could be identified. It has also made it possible to discover waste in the flow. Furthermore, a bottleneck that is limiting the outcome of textiles could be identified. An analysis of the capacity shows that the company does not utilize the available capacity. Based on the identified problems, the bottleneck, variations in performing of work, variations in time of working and process occupied, waiting, over-processing, unnecessary transporting, and motions are considered having the largest impact on the sorting chain and improvements are economical practicable. The suggested improvements can compile to two main improvements: Increase the capacity and reduce the waste in the process of detail sorting, to reduce the limitation that constitutes of the bottleneck and standardize the processes to reduce variations and waste. The recommendations to the company are, begin to standardize the working methods to reduce the variation, utilize the capacity and reduce waste in the bottleneck in order to eliminate waste in the rest of the processes. Furthermore, we recommend that the company examine the processes to further reduce variations in the chain, examine and control the variations in incoming textile, and analyze inventory holding for the change of the volume in textiles.

  • 328.
    Hassani, Sarina
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Kolic, Aida
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Förbättring av svetsprocessen för Spectra Premiums TIG-robot2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Spectra Premium is located in Trollhättan and manufactures fuel tanks for hybrid cars. Welding between the fuel tank and the filler pipe is an important part of the production process and has been a focus area for improvement. The result of the welding from the TIG robot has been unreliable and has resulted in manual welding adjustments. Consequently, the robot har become the biggest bottleneck in the production. The purpose of this work is to investigate why problems arise with the TIG-robot, to acquire background knowledge and to analyse and understand the causes of the welding defects. The goal is to provide the company with a basis for likely factors that can later be utilised in selecting improvement proposals. Due to time constraints, this project was limited to only examining welding defects which throughout the project occurred frequently on the fuel tanks of the TIG robot.

    Background knowledge was acquired through literature study, web search, observations and interviews with company staff. Using shift reports, data was analysed to identify current welding defects and to find potential patterns. After identifying potential root causes for the occurrence of welding defects using a literature study and an Ishikawa diagram, the next step was to find improvement suggestions through brainstorming. Finally, the most probable factors affecting the welding result were presented, alongside with suggestions for improvement. All of which the company can use to improve its welding process.

    The final results showed that the welding result from the TIG robot can be affected by a variety of factors. In particular, the angle of the torch, the shielding gas flow, the chosen welding method, the selected welding technique, manual tool centre point (TCP) measurement and any deviations in fixtures.

  • 329.
    Hatefipour, Saeid
    et al.
    University West, Department of Engineering Science, Division of Automation Systems. saeid@termisk.se.
    Ahlberg, Jörgen
    Linköping University.
    Wren, Joakim
    University West, Department of Engineering Science, Division of Automation Systems.
    Runnemalm, Anna
    University West, Department of Engineering Science, Division of Automation Systems.
    Thermal non-destructive testing: modeling, simulation and experiments for improved localization of hidden defects2014In: The 12th International Conference on Quantitative Infrared Thermography, 2014, p. 1-8Conference paper (Refereed)
    Abstract [en]

    During the last decades, a substantial amount of research and practical work has been conducted on non-destructive testing of materials using thermography. The performed studies elucidate the potential of various types of thermal non-destructive testing (TNDT) for different materials and applications, including various types of defects. This paper presents a method for detecting in-depth defects in metallic materials and a simulation model for the heat transfer in the material. Experiments are performed on a test specimen with artificial defects (flat-bottom holes). The detection method exploits spatiotemporal analysis in order to find deviations from a model of normality, and shows novel results. Thermal modelling is performed in order to have a base-line simulation model enable us to (a) investigate affecting parameters without repeating the experiments and (b) generalize the results and extend their validity to other cases. Results show that there is an acceptable compliance between simulated and measured thermal data. 

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    Final-QIRT-A8877SH
  • 330.
    Hattinger, Monika
    University West, Department of Engineering Science, Division of Production Systems.
    Researchers design conceptions of e-learning courses targeting industry practitioners’ competence needs2018In: International Journal of Continuing Engineering Education and Life-Long Learning, ISSN 1560-4624, E-ISSN 1741-5055, Vol. 28, no 3-4, p. 235-253Article in journal (Refereed)
    Abstract [en]

    This paper addresses two overall challenges that concern university research teachers' professional identities when they make design plans for blended e-learning courses targeting practitioners' competence needs. Research teachers' are challenged by finding applicable learning material that matches practitioners' experiences and workplace knowledge demands. They are also challenged when they need to digitise engineering learning content such as virtual labs, and machine-related cases such as turning and milling aligning to workplace needs. Design plans used for campus education is argued to be insufficient meeting these challenges. Consequently, researchers' professional identities become vulnerable when they cross boundaries between university and industry practices. Results show that even if researchers are not trained for educational e-learning design they identify concepts for digitising cases and labs. By applying a work-integrated learning strategy, the courses integrate practical and theoretical tasks and cases collected from the manufacturing industry workplaces and thereby support competence development. © 2018 Inderscience Enterprises Ltd.

  • 331.
    Hattinger, Monika
    et al.
    University West, Department of Engineering Science, Division of Production Systems.
    Eriksson, Kristina M.
    University West, Department of Engineering Science, Division of Production Systems.
    Action design research: Design of e-WIL for the manufacturing industry2015In: 2015 Americas Conference on Information Systems, AMCIS 2015: 21st Americas Conference on Information Systems, AMCIS 2015, Fajardo, 13 August 2015 - 15 August 2015, Americas Conference on Information Systems , 2015Conference paper (Refereed)
    Abstract [en]

    This paper reports on a design process of e-learning courses for competence development of experienced employees in the manufacturing industry. Through a crossorganizational collaborative action design research project the aim was to design e-learning courses at university level to support work-integrated learning. Two designand learning cycles were evaluated over two years. The first cycle identified challenges that were applied to a pilot course in Industrial automation. From evaluation of this course we derived design principles applied to two further courses in Machining and Negotiation skills. The results from our empirical data suggest general principles as competence mapping work, collaborative manufacturing e-WIL cases and interactive learning technologies for design of e-WIL courses as boundary crossing activities to reach transformative learning integrated in the manufacturing industry.

  • 332.
    Hattinger, Monika
    et al.
    University West, Department of Engineering Science, Division of Production Systems.
    Eriksson, Kristina M.
    University West, Department of Engineering Science, Division of Production Systems.
    Co-Construction of Knowledge in Work-Integrated E-Learning Courses in Joint Industry-University Collaboration2018In: Proceedings of the 11th International Conference on E-Learning in the Workplace (ICELW 2018) New York, New York, USA 13 – 15 June 2018 / [ed] David Guralnick, New York, 2018, p. 13-18Conference paper (Refereed)
  • 333.
    Hattinger, Monika
    et al.
    University West, Department of Engineering Science, Division of Production Systems.
    Eriksson, Kristina M.
    University West, Department of Engineering Science, Division of Production Systems.
    Co-construction of Knowledge in Work-Integrated E-learning Courses in Joint Industry-University Collaboration2018In: International Journal of Advanced Corporate Learning, E-ISSN 1867-5565, Vol. 11, no 1, p. 10-16Article in journal (Refereed)
    Abstract [en]

    Blended e-learning in higher education targeting company knowledge needs, can support continuous competence development for practitioners in the manufacturing industry. However, university education is traditionally not designed for workplace knowledge needs that strengthen practitioners' learning in everyday work, i.e. work-integrated learning.

    Designing for such learning efforts is even more challenging when the pedagogical strategy is to stimulate practitioners own work experiences as a valuable knowledge source in construction with other peers or teachers. The aim is to explore how engineering practitioners and research teachers mutually co-construct knowledge. In particular, three types of case-based methodologies are examined within a range of industry targeted e-learning courses. The study is part of alongitudinal joint industry-university project. Eleven courses were analyzed through focus group sessions with 110 practitioners from 15 different companies. Results show that 1) Virtual digital cases stimulate high technology learning, but show low collaboration with peers, 2) On-line collaborative negotiation cases stimulate both web conferencing and high interactivity, and 3) Real workplace cases do not stimulate e-learning, but motivate strong work-integrated learning and knowledge expansion.

  • 334.
    Hattinger, Monika
    et al.
    University West, Department of Engineering Science, Division of Production Systems.
    Eriksson, Kristina M.
    University West, Department of Engineering Science, Division of Production Systems.
    Hegli, Per
    Addisco Educ, Oslo, (NOR).
    Henriksen, Nina
    Addisco Educ, Oslo, (NOR).
    Management Strategies For Knowledge Transformation: A Study Of Learning Effects In Industry-Union-University Collaborative E-Learning Initiatives2018In: ICERI2018 Proceedings: 11Th International Conference Of Education, Research And Innovation (Iceri2018), International Association for Technology, Education and Development, 2018, p. 10049-10057Conference paper (Refereed)
    Abstract [en]

    Competence development on academic level is a key factor for industries in times of increased digitalization of manufacturing work. To develop competitive manufacturing requires employees with expert knowledge. Even if individual employees’ motivation for learning is essential, management need to put efforts on competence development and encourage education that, combine theory and practice in forms of work-integrated learning. Blended e-learning courses on university level has been successful for supporting such competence development needs, which here is described as work-integrated e-learning, e-WIL. In this study, we explore practitioners’ knowledge transformation after their participation in blended e-WIL courses that are designed with industry target content aiming for workplace transformation. Specifically, we focus on the learning efforts versus the management strategies after e-learning initiatives that have an effect on workplace transformations. The industry target courses are designed in collaboration between an industry-union-university venture of a Norwegian industry network, the Addisco union and a Swedish university. Six courses are included comprising three course subjects; Logistics and Supply Chain Management, Engineering Tools, and Robotics and Automation. Addisco was the facilitator for engaging industry-university collaboration, and stimulated co-creation between industry companies. Data was collected through a longitudinal action research project, comprising six focus group sessions with 113 industry participants during 2015 and 2018. We analysed the company management support of knowledge transformation through the course participants’ experiences after the course interventions. Overall results show that most participants experience a low management support of knowledge transformation as an engine for workplace transformation, after conducting e-WIL courses. Stimulation of individual motivation and new skills gained were not promoted within the workplace structures. There seem to be a lack of individual competence plans, time for studies, business models and routines, networking and recognition of the individuals’ knowledge transformation. Rather, participants claimed individual responsibilities, and motivation that drives them to competence development. We therefore argue for stronger management awareness and to develop company strategies that fully appreciate the added values and new knowledge that industry participants bring back after course participation.

  • 335.
    Henriksen, Daniel
    et al.
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Lööf, Rebeca
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Fält, Jonas
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Verksamhetsmodell för införande av nya produkter2014Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report describes a thesis work performed at GKN Aerospace in Trollhättan. The goal of this thesis has been to improve the process for new product introduction with focus on reducing lead time, cost and quality issues. To describe the work methodology regarding manufacturing preparation and production ramp-up, a proposal for a new business model was created.

    The thesis work has been based on a product development perspective. Information was gathered from interviews with GKN Aerospace employees and literatures about different work methodologies.

    To define final requirements for the business model, customer needs was identified and weight relative each other. As the final requirements were defined, a number of concepts were created and end one of them was selected for further development.

    The thesis work resulted in a new business model where work methodology and instructions are documented in a handbook. The handbook describes the different phases of the business model and a short presentation of the involved functions along with input and output. The purpose of the handbook is to be used as a tool for project managers and employees in the start-up of new products.

    For further development and implementation of the new business model, a document was created where potential risks have been analyzed and recommendations regarding implementation of the new business model are described

  • 336.
    Heralic, Almir
    University West, Department of Engineering Science.
    Towards full Automation of Robotized Laser Metal-wire Deposition2009Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Metal wire deposition by means of robotized laser welding offers great saving potentials, i.e. reduced costs and reduced lead times, in many different applications, such as fabrication of complex components, repair or modification of high-value components, rapid prototyping and low volume production, especially if the process can be automated. Metal deposition is a layered manufacturing technique that builds metal structures by melting metal wire into beads which are deposited side by side and layer upon layer. This thesis presents a system for on-line monitoring and control of robotized laser metal wire deposition (RLMwD). The task is to ensure a stable deposition process with correct geometrical profile of the resulting geometry and sound metallurgical properties. Issues regarding sensor calibration, system identification and control design are discussed. The suggested controller maintains a constant bead height and width throughout the deposition process. It is evaluated through real experiments, however, limited to straight line deposition experiments. Solutions towards a more general controller, i.e. one that can handle different deposition paths, are suggested.

    A method is also proposed on how an operator can use different sensor information for process understanding, process development and for manual on-line control. The strategies are evaluated through different deposition tasks and considered materials are tool steel and Ti-6Al-4V. The developed monitoring system enables an operator to control the process at a safe distance from the hazardous laser beam.

    The results obtained in this work indicate promising steps towards full automation of the RLMwD process, i.e. without human intervention and for arbitrary deposition paths.

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  • 337.
    Hermansson, Jonas
    et al.
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Bergström-Kvidén, Sebastian
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Kartläggning och effektivisering av externa transporter på Siemens Industrial Turbomachinery AB i Trollhättan2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The bachelor’s thesis has been performed at Siemens Industrial Turbomachinery AB in Trollhättan (SIT) and has treated mapping and visualization of external transport, which arises in connection with external manufacturing operations regarding the combustor model SGT- 800B. Furthermore, the working group conducted an environmental review associated with these transportations.

    To carry out the bachelor’s thesis both the use of unstructured and semi-structured interviews but also data collected from SAP. The collected data was the basis for an article register where data from the interviews and SAP was entered. These were in the form of: weight, distance, loading meters and transportation cost. The environmental review was founded on material collected from the truck transports overall emission levels and the total mileage found in the article register.

    The work resulted in a number of different historgrams which demonstrated: transport cost, mileage, transportation cost per metric mil and the most frequently used transfer companies. Two pareto charts was created in order to identify the transportation cost and mileage on the article level, to visualize what articles that are the major cost and mileage carriers. The environmental review gave a table of data on total emissions caused by transportations to external manufacturing operations.

    When calculating SITs total transportation costs no regards have been taken to groupage traffic or loop runs which would have reduce the transportation costs. It also emerged that SIT had a cost reduction potential from their current transportation costs.

    The conclusions of the bachelors thesis is that transportations performed by transportation company A is the largest transportation cost carrier. SIT should primarily be working with transportation company A to reduce this transportation cost, because this provides the potentially largest transport cost reduction within a two years period

  • 338.
    Hermansson, Tobias
    et al.
    University West, Department of Engineering Science.
    Lindh, Daniel
    University West, Department of Engineering Science.
    Topologioptimering inom Svetsbaserad Additiv Tillverkning: applicerat på Pendelarm för Bandsystem2022Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    This Bachelor thesis has been carried out in the field of product development in the Department of Engineering. Parts of the thesis was carried out at the Production Technology Centre (PTC). The thesis includes investigation of the combined use of topology optimization and Wire Arc Additive Manufacturing (WAAM) applied on a linking arm for a track system. Based on the purpose of the work, the following questions will be answered: How do topology optimization and WAAM work? How is topology optimization carried out with AutodeskInventor? Is it possible to combine topology optimization and WAAM effectively? Do optimized objects need to be adjusted manually to be produced in the given WAAM process?

    Furthermore, a theoretical framework was set for the WAAM process, topology optimization and FEM analysis to be able to answer the questions that have been stated previously. This was done with the aim of gaining a deeper understanding of the different concepts and how they are used in practice. Together with the client, the production rig used in the work was studied and strength requirements, acting forces and dimensions of the linking arm were established. Once these points were established, the optimization process on the linking arm begun, which was done in Autodesk Inventor. The optimization process consisted of FEM analysis, topology optimization and final processing towards the WAAM process. A brief review of the manufacturing process's preparation parameters is also presented.

    From the purpose of the work, three points were also formulated that describe that the work should result in a topology-optimized and manufacturing-possible linking arm. Analysis between the non optimized and the optimized linking arm. An analysis of how the topology optimization and WAAM are combined with regards to specified limitations and requirements. In the results section, the digital and physical model is analysed based on the specified points, the optimization methodology is also analysed based on the implementation ability and user-friendliness. The method used in the work proves to be very useful in this form of optimization problems which include individual components of lower geometric complexity.

    Finally, various aspects of the work were discussed and how any improvement or developments can be implemented. A reflective conclusion is given based on the questions presented at the beginning of the work and how well they have been answered.

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  • 339.
    Hermawatia, Setia
    et al.
    Human Factors Research Group, Faculty of Engineering, The University of Nottingham.
    Lawson, Glyn
    Human Factors Research Group, Faculty of Engineering, The University of Nottingham.
    D'Cruz, Mirabelle
    Human Factors Research Group, Faculty of Engineering, The University of Nottingham.
    Arlt, Frank
    Adam Opel AG – General Motors Company, Rüsselsheim, Germany.
    Apold, Judith
    Adam Opel AG – General Motors Company, Rüsselsheim, Germany.
    Andersson, Lina
    VOLVO Group, Gothenburg.
    Gink Lövgren, Maria
    VOLVO Group, Gothenburg.
    Malmsköld, Lennart
    University West, Department of Engineering Science, Division of Automation Systems. Volvo Technology.
    Understanding the complex needs of automotive training at final assembly lines2014In: Applied Ergonomics, ISSN 0003-6870, E-ISSN 1872-9126, Vol. 46, p. 144-157Article in journal (Refereed)
    Abstract [en]

    Automobile final assembly operators must be highly skilled to succeed in a low automation environment where multiple variants must be assembled in quick succession. This paper presents formal user studies conducted at OPEL and VOLVO Group to identify assembly training needs and a subset of requirements; and to explore potential features of a hypothetical game-based virtual training system. Stakeholder analysis, timeline analysis, link analysis, Hierarchical Task Analysis and thematic content analysis were used to analyse the results of interviews with various stakeholders (17 and 28 participants at OPEL and VOLVO, respectively). The results show that there is a strong case for the implementation of virtual training for assembly tasks. However, it was also revealed that stakeholders would prefer to use a virtual training to complement, rather than replace, training on pre-series vehicles.

  • 340.
    Hernández Justicia, Javier
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    From design to Wire Arc Additive Manufacturing (WAAM): Development of a protocol from G-Code to Rapid Code2021Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Additive manufacturing (AM) has supposed a revolution in the way of manufacturing parts,from the design to the machining. Many materials can be used with AM, from polymers or ceramics to metals. If talking about metals, Wire Arc Additive Manufacturing (WAAM) has increased its popularity in the last years, most of all, due to its high deposition rates. However, WAAM still has to deal with a series of challenges to be business competitive: residual stresses and distortions, monitoring and process control or the translation of the CAD design to the robotic system in an efficient way are some of the main WAAM challenges. The CAD design is first sliced into a set of layers, and after a deposition strategy is given to each layer. The deposition strategy consists in a set of move instructions codified in G-Code language in order to be understood by CNC machines. Nevertheless, if these move instructions are wanted to be translated to an ABB robotic system, RAPID language is needed. For that purpose, in collaboration with other developer, a method to convert G-Code language to RAPID language was developed in the present work. Additionally, intending to the research of the optimal WAAM process parameters, a tool to modify the orientation of the torch, which is one of the most influent WAAM process parameters, was developed. By the utilization of c sharp programming language in Microsoft Visual Studio, in combination with RobotStudio Software Developer Kit (RobotStudio SDK), which through a set of libraries allows the interaction between Visual Studio and RobotStudio, a method to transform GCode to RAPID code and import it to RobotStudio, and a tool to modify the orientation of the torch were implemented.First, a literature review of the WAAM’s slicing procedures, main process parameters and principal challenges, which lead to the goal of the project, were described. Second, the activities carried out during the project, deepening in the programming part were explained. Finally, the results obtained, and conclusions were presented. The results present a program capable to convert a given G-Code program into its equivalent RAPID program, which can be loaded to RobotStudio, and a RobotStudio tool to modify the orientation of the torch in a simple and quick way.

  • 341.
    Hill, Richard
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Solljusdriven avsaltningsanläggning Richard2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this thesis, a concept for a sunlight-powered desalination system has been developed. The work has been based on an original concept that utilizes recycled PET plastic (from for example PET-bottles) and pollution free water. The plastic is shaped in such a way that, together with the pollution free water forms a liquid-filled lens. The water must be particle-free so that no particles can reflect sunlight in the wrong direction. With this type of lens sunlight can be concentrated and focused on a container with salt water, which then evaporates. The evaporated stem is then condensed back to distilled water.

    Methods used for identification of customer requirements were an interview, the study of reports, books, magazines, patents and regulatory framework for similar solar facilities. There has also been some prototype experiments conducted that contributed to the identification of further customer requirements.

    Several of today’s solar concentrating plants have been studied, their advantages and disadvantages have been identified from several literature sources. The methods implemented during the concept generation consisted of sketches, prototype tests and examinations of similar concepts. The choice of the final concept was made with the help of matrices. These showed which met most requirements, by efficiency calculations and prototype testing.

    The result consist of a four-meter long and one meter wide water-filled lens with rounded ends. The lens is used to heat a Receiver filled with salt water. When the saltwater becomes warm enough, the water evaporates into a vapor pipe which is led down through a cooling coil which is in a water tank, the same water tank that distributes saltwater into the receiver tube.

    The solar concentrating lens is made of about 100 kg recycled transparent PET plastic, collected in countries with access to non-recycled plastic debris. It is constructed of two halves which can be used as small greenhouses or as construction parts for large greenhouses. The lens is filled with particle-free water, some alcohol (to prevent the lens from freezing during the night) and a little bleach (to discourage algae formation inside).

    The effect that was calculated showed that a plant with a lens could produce about 55 liters of fresh water per hour. When calculating the manufacturing cost of a lens it was done under the assumption that it would be made in a factory in Kenya, where the recycled plastic cost 1 SEK/ Kg. The total cost became SEK 300 per lens during the first two years. The machinery were presumed to be payed for by the end of the second year, which would lead to a reduced production price and the lenses would then cost 183 SEK each. A preliminary calculation of cost per produced cubic meter of freshwater then gave a final price of 0.75 SEK per cubic meter, which is the cheapest price for desalinated water on the market today, which otherwise is 3.6 SEK ($ 0.56 in 2011) per cubic meter.

  • 342.
    Hillström, Oscar
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Johannesson, Mattias
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Integration of a belt in a seat: Safety in autonomous cars2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The world's first driverless ride on public roads was performed in 2015 by Google with their concept car Waymo. The Swedish transport agency investigated what could be expected to be seen on the market at the year of 2020. Several companies announced that self-driving cars will be produced during 2020 with "Limited Autonomous Driving".

    Autonomous driving is defined in several levels. There is no automation at level 0 and fully autonomous driving at level 4. Consequently, new cars may incorporate interior design with flexible seating positions. In order to achieve this, belt integrated seats, BIS, are a favored solution by the vehicle manufactures, because the seatbelt is mounted on the seat structure, independently from the vehicle chassis.

    Autoliv, which is one of the world's largest automotive safety supplier, were interested to gain increased knowledge about BIS, and initiated this project. The project goals were to examine regulating laws for the design of BIS and to create concepts of how a seatbelt may be integrated in a conventional seat structure. Boundaries were set to limit the research on regulations and also the number of concepts that were generated and evaluated.

    Ulrich and Eppinger's product development process was the primary applied method for the project. Experts at Autoliv and external companies were consulted for guidance and knowledge during the project to validate a more reliable outcome.

    Three regulations that the authors judged to be important in order to validate a concepts performance were the ECE R14, ECE R17 and FMVSS 301. In R14, three static loads shall be supplemented on the seat. In R17, the seat shall withstand displaced luggage which is the dynamic scenario often used to dimension seats. The FMVSS 301 is a dynamic crash test that provides a good indication on the crash performance of the seat.

    The concept generation phase was influenced by an external search consisting of benchmarking and discussions with experts about BIS, which provided a total of five unique BIS positions. The internal search resulted in 13 concepts which were evaluated with a scoring matrix during a group session with the project group and experienced experts.

    The result provides a guidance of where it may be best to implement the seatbelt in the seat structure in terms of packaging, day to day use, crash performance and comfort. Concepts with a webbing guide across the seatback were considered to less feasible due to the luggage crash test in ECE R17, compared to concepts without. Concepts in the upper seatback area received general higher score, due to the increased ride-down efficiency and comfort.

    The project managed to comply with the project goals within the specified timeframe and is satisfied with the outcome, which hopefully is shared by the customers, Autoliv.

  • 343.
    Hinder, Joakim
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Karlsson, Alexander
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Verksamhetsutveckling inom service och eftermarknad: En affärskartläggning inom hälso- och sjukvårdssektorn2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Graniten is a company that develops smart machine solutions. One of the customer segments the business is working towards is the healthcare sector. In this report, work is limited to the hospital part of the segment. The machine solutions that Graniten sells must generate value for the customers and function as promised, which means that the company offers service to reduce the possibility of the machines ceasing to function. Graniten divides its service offerings into three parts: telephone support, maintenance, and emergency support.

    In recent years, a fourth technological revolution has taken place. The revolution is characterized by high levels of automation, digitalization, and integrations. The development has led to a higher degree of automatic processes in companies, and a higher need for service to maintain the machines. When developing machines, service offerings should be developed to meet the customers' future needs. Therefore, it is an advantage to map, analyze, and develop the service work of the company in line with technological development.

    By conducting interviews with the company's customers, the current service work was mapped, and a picture of customer satisfaction and wishes were created. The respondents express a high degree of satisfaction, where future wishes can be interpreted as proactive work by the Graniten to facilitate customers' everyday lives. To see which areas that are possible to develop within the business, a comparison was made between other companies in which the majority had some connection to mechanical engineering and thus service. The comparison gave way to development proposals in service offerings such as predictive monitoring, integrated systems, and technical tools to facilitate customer service experience.

    The comparisons and interviews were analyzed to design Graniten's conceivable future service offerings. The new conceivable offers presented are system integration, monitoring, and proactive work. The system integration is presented as a central offering, where Graniten can offer monitoring of customers' machines and systems. To quickly and efficiently rectify faults and perform maintenance proactively and automatically. The integration should be possible with Graniten's technical system and developed customer channels. By developing the service work, Graniten can offer more efficient service and facilitate the customers' everyday lives. The offers create a higher value for the customers when the machine's operating time can be more superficially secured.

    The report authors argue that in the continued development of Graniten's service work, it may be interesting to analyze revenue streams further. During the work, questions about payment methods were not relevant to the majority of respondents. One reason that emerged during one of the interviews was that customers were operating under specific VAT laws. When developing revenue streams, companies that are not covered by Sweden's laws may be exciting to compare and analyze.

  • 344.
    Hiuhu, John
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Shear spinning of nickelbased super alloys and stainless steel2015Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Shear spinning of Haynes 282, Alloy 718, Alloy 600 and AISI 316L was done using several tool feeds and mandrel clearances. Multi passing of the materials was limited due to strain hardening and circumferential cracking except for AISI 316L. The effect of the tool feed and the mandrel clearance on the successful forming of the materials was established. The successfully spun samples were solution heat treated at varying temperatures and holding times to establish a range of grain sizes and hardness levels. An aging heat treatment process was performed for Haynes 282 and Alloy 718 to achieve precipitation strengthening. The micro hardness measurements were conducted for the materials prior to spinning and after spinning. The same was also done after the various heat treatment processes. Grain size mapping was conducted by the use of lineal intercept methods. Comparison of the results in terms of grain sizes and hardness values was done. The temperature ranges suitable for full recrystallization of the materials after the shear spinning were identified and the effect of the holding times on the grain growth established. Comparison with unspun samples showed that the heat treatment times required to achieve comparative hardness and grain sizes were distinctively different.

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  • 345.
    Hjälm, Anton
    et al.
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Jansson, Henrik
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    Development of an All-Terrain Chassis for a Modular Platform Based Electric Vehicle2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report presents the execution of a thesis work regarding the development of a modular chassis for an electric vehicle. The work is based on a concept by Cubix Drives AB. In this thesis work, their concept has been further developed in order to ensure that it can withstand the loads that the components are subject to when the vehicle is being used.

    Throughout the work, by using CAD- and FEA-software's, the components have been designed and exposed for load cases that intends to simulate possible scenarios during off road driving. As the stresses were identified the components have been improved to keep the stress levels below the fatigue limit.

    The components have been assembled into a chassis designed to utilize predetermined components regarding the electric drives, steering mechanism and power source that should be able to withstand the loads that it is estimated to being subject for when driving in a forest environment.

    Suitable manufacturing methods, materials and surface treatments have also been chosen. Further work is required mainly regarding the brake system but also regarding adaption for the electrical wiring and control boxes. Other areas of application for the chassis have also been investigated, such as a boat trailer and a dumper.

  • 346.
    Hodzic, Damir
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Kim, Hojoong
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Förebyggande underhåll med industri 4.02022Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The combustion of fossil fuels is the biggest cause of the greenhouse effect on earth. The Paris Agreement has accelerated a change in the automotive industri to achieve goals set to reduce emissions from passenger car transport and improve local air quality in cities. Sales of electric cars have increased over the past decade and are expected to increase even more in the future. The combination of increased sales of electric cars and increased demand for batteries means that battery recycling can play a key role in the future.

    Lithium-ion batteries are the most common type of battery in electric cars due to their energy density, weight, size, and price. Primary production of LIBs entails negative social, economic, and environmental effects in the extraction of the raw materials.

    To reduce these negative side effects, the recycling of electric car batteries needs to be developed.To streamline a process, the implementation of a functioning maintenance system is advantageous. Maintenance is divided into preventive maintenance and remedial maintenance. In this report, the focus will be on preventive maintenance. The purpose of preventive maintenance is to reduce the number of unplanned downtime that affects efficiency, product quality and profitability.

    With technology and methods from industry 4.0, the fourth industrial revolution, preventive maintenance can be improved. Through the implementation of a continuous monitoring of room and machine status, problems can be discovered to increase the condition-based maintenance and reduce the period-based maintenance.

    To create a deeper understanding of the battery recycling process, preventive maintenance,and industry 4.0, literature studies have been performed. To compare theoretical knowledge generated from the literature studies with how preventive maintenance and Industri 4.0 are implemented and used in practice, a case study was conducted at Essity AB in Lilla Edet.

    A concept for preventive maintenance has been developed by creating a maintenance schedule, maintenance instructions, block diagrams and a signal flow schedule for the crushing room in a battery recycling plant. The maintenance schedule consists of a schedule and a maintenance instruction. A CAD model has been created to explain the door lock system, a security feature, which was developed using a concept generation method.

    The results are based on the literature studies, the case study, information from the supervisor, a process FMEA, maintenance manuals from machines and block diagrams.

  • 347.
    Hodzic, Irma
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Karlsson, Elin
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Kartläggning och effektivisering av Oriolas inleveransflöde i centrallagret i Mölnlycke2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

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

  • 348.
    Hogmalm, William
    University West, Department of Engineering Science, Division of Automation Systems.
    Undersökning av visionsystem för hantering av trämaterial i automationssystem2014Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    University West is involved in research in automation and production technology. One project is to investigate the opportunity of assembling wood constructions for prefabricat-ed houses with robots in an automated system instead of manual assembly. Automated production of wood constructions is an opportunity for house manufacturers to develop a more competitive assembling process with high and consistent quality. One problem that occurs when robots move the wooden parts is that the material position misaligns due to variations in the material shape. The thesis work has been focused on investigating how a vision system can be designed to provide information to the robots how the material is placed. The report gives a description of the items included in a vision system and the working methodology for the system. It has been investigated which major factors that is needed to create a successful vision application. Experimental samples have been made by using a vision camera for image acquisition when the wood material is placed on the as-sembling table. The images were then image processed and analyzed in computer to find out if the desired information can be read from them. The difficulties that occur when the images are obtained have been investigated. It has been investigated how a vision program can be designed to perform measurements in the image to determine whether a placement is correct so the assembling can be performed. The focus was to make a program that is flexible and extendable with more functions so it can be adapted in many different assem-bly steps. By using the result from the program the robots shall be able to have information of how the material shall be corrected. The investigation has shown good potential in de-veloping a vision based inspection system to correct the position and shape changes that may occur in wood handling. It has also demonstrated the challenge, in building a success-ful application, with creating a well optimized lighting that illuminates the desired parts of the images. The study has shown the opportunities in get accurate results from images ob-tained at close range, as when camera is mounted on the robot. The results have also shown that more studies are suitable to implement in order to investigate which alternative and complementary technologies that may be appropriate to use in this challenge

  • 349.
    Holm, Mathias
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Vestfeldt, Joel
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Införande av AGV:er i GKN's produktion: en förstudie2020Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor's thesis work has been made at GKN Aerospace Engine Systems in Trollhättan. GKN strives to introduce methods and technologies to improve the manufacturing process of their high volume part 30k IMC. GKN has now become interested in introducing autonomous transport vehicles in their production. The technology within Automatic Guided Vehicle (AGV) has now come so far that GKN believes that it is now possible to introduce in their production. GKN currently lacks information if AGV: s can be introduced in their production based on an economic, technical and personal safety aspect. Today GKN only have manual forklifts and pallet trucks for transporting details in its production. The manual forklifts take up space, pose a safety risk and contribute to costs for the company. If decision basis for implementation is implemented, GKN uses the pay-nackmethod and present value calculations to assess whether an implementation is favorable.Transportation of details that are not handled by personal in the workshop is currentlycarried out by hired personal from an external company. For this transport a counterweighttruck is used. The goal is to generate information about what the introduction of AGVs into GKN's production entails. When collection information on aspects a company should take into consideration when introducing AGVs offered on the market, AGV suppliers have been interviewed. In order to choose the most suitable AGV for handling transport has the following methods, concept screening, decision matrix method, the pay-back method, present value and a life cycle cost been used. In the result are concept choices and economic calculations presented. A discussion is held at the end of the work on results, choice of pilot area and effects on the introduction of AGV's. The conclusion is that an AGV is not suitable for transport within the 30k IMC process, because the frequency of pallets does not meet the requirement that makes the use of AGV's efficient.

  • 350.
    Hui, Chu
    University West, Department of Engineering Science, Division of Production System.
    A Simplified Pose Estimation Algorithm for Bin Picking: Using the convex hull of the CAD model2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The applications of robotics are becoming more and more popular. Lots of tasks in the industry like welding, painting, handling, assembly, casting and so on are handled by robots now. Currently most industrial robots on the production line are controlled by pre-teaching which is not effective and flexible. The automation of robots has been researched since the first robot introduced to the industry. The basic task like the automation of picking objects for a robot is still a challenge. University west wants to find a faster automation picking method for industrial robots. This thesis presents a simplified pose estimation algorithm for bin picking by using the CAD model of the object. The main idea is to simplify the pose estimation task by identifying all stable positions of the object and predefining a picking point for each stable position according to the data of its CAD model in advance. Then the online work focuses only on the image analysis in 2D which is simple so as to achieve a fast picking. The experimental results satisfy the requirements. First, all positions of the object are found by checking the convex hull of its CAD model. A stable position is identified as having the centre of gravity above the convex hull of the support surface of the position. Then virtual images are generated using a computed virtual camera, having the same parameters as the calibrated camera, in all stable positions of the object, seen from above. All virtual images are classified into different classes for the preparation of the online classification. Picking points for each stable position in the virtual images are predefined. The 3D data of each picking point is calculated according to the data of its CAD model in advance. Finally, the online work finds the class which the real image represents and the predefined picking point. The final pose is estimated by the position transformed from the image coordinate system to the world coordinate system using the camera position and rotation. This algorithm focuses on well-defined objects having a limited number of stable positions and only non-zero area support surfaces. Further works will be the trajectory planning which should avoid conflict by using the CAD model of the object.

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