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  • 1551.
    Wang, Lihui
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. KTH Royal Institute of Technology, Stockholm, Sweden.
    Mohammed, Abdullah
    KTH Royal Institute of Technology, Stockholm, Sweden.
    Wang, Xi Vincent
    KTH Royal Institute of Technology, Stockholm, Sweden.
    Schmidt, Bernard
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Recent Advancements of Smart Manufacturing: An Example of Energy-Efficient Robot2016In: Proceedings of the 26th International Conference on Flexible Automation and Intelligent Manufacturing, 2016, p. 884-892Conference paper (Refereed)
    Abstract [en]

    The cloud technology provides sustainable solutions to the modern industrial robotic cells. Within the context, the objective of this research is to minimise the energy consumption of robots during assembly in a cloud environment. Given a trajectory and based on the inverse kinematics and dynamics of a robot from the cloud, a set of feasible configurations of the robot can be derived, followed by calculating the desirable forces and torques on the joints and links of the robot. Energy consumption is then calculated for each feasible configuration along the trajectory. The ones with the lowest energy consumption are chosen. Since the energy-efficient robot configurations lead to reduced overall energy consumption, this approach becomes instrumental and can be applied to energy-efficient robotic assembly.

  • 1552.
    Wang, Lihui
    et al.
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    Nee, Andrew Y. C.
    Collaborative Design and Planning for Digital Manufacturing2009Collection (editor) (Other academic)
  • 1553.
    Wang, Lihui
    et al.
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Ng, Amos H. C.University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.Deb, KalyanmoyUniversity of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Multi-objective Evolutionary Optimisation for Product Design and Manufacturing2011Collection (editor) (Refereed)
  • 1554.
    Wang, Lihui
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. Department of Production Engineering, Royal Institute of Technology, Stockholm, Sweden.
    Schmidt, Bernard
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Givehchi, Mohammad
    Department of Production Engineering, Royal Institute of Technology, Stockholm, Sweden.
    Adamson, Göran
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Robotic Assembly Planning and Control with Enhanced Adaptability through Function Blocks2015In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 77, no 1-4, p. 705-715Article in journal (Refereed)
    Abstract [en]

    Manufacturing companies today need to maintain a high level of flexibility and adaptability to deal with uncertainties on dynamic shop floors, including e.g. cutting tool shortage, part supply interruption, urgent job insertion or delay, and machine unavailability. Such uncertainties are characteristic in component assembly operations. Addressing the problem, we propose a new method using function blocks to achieve much improved adaptability in assembly planning and robot control. In this paper, we propose to use event-driven function blocks for robotic assembly, aiming to plan trajectory and execute assembly tasks in real-time. It is envisioned that this approach will achieve better adaptability if applied to real-world applications.

  • 1555.
    Wang, Lihui
    et al.
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre. Department of Production Engineering, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden.
    Schmidt, Bernard
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Nee, Andrew Y. C.
    Department of Mechanical Engineering, National University of Singapore.
    Vision-guided active collision avoidance for human-robot collaborations2013In: Manufacturing Letters, ISSN 2213-8463, Vol. 1, no 1, p. 5-8Article in journal (Refereed)
    Abstract [en]

    This paper reports a novel methodology of real-time active collision avoidance in an augmented environment, where virtual 3D models of robots and real camera images of operators are used for monitoring and collision detection. A prototype system is developed and linked to robot controllers for adaptive robot control, with zero robot programming for end users. According to the result of collision detection, the system can alert an operator, stop a robot, or modify the robot's trajectory away from an approaching operator. Through a case study, it shows that this method can be applied to real-world applications such as human-robot collaborative assembly to safeguard human operators.

  • 1556.
    Wang, Lihui
    et al.
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Song, Yijun
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Gao, Qiaoying
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Designing function blocks for distributed process planning and adaptive control2009In: Engineering applications of artificial intelligence, ISSN 0952-1976, E-ISSN 1873-6769, Vol. 22, no 7, p. 1127-1138Article in journal (Refereed)
    Abstract [en]

    The objective of this research is to develop methodologies and a framework for distributed process planning and adaptive control using function blocks. Facilitated by real-time monitoring system, the proposed methodologies can be applied to integrate with functions of dynamic scheduling in a distributed environment. A function block-enabled process planning approach is proposed to handle dynamic changes during process plan generation and execution. This paper focuses mainly on distributed process planning, particularly on the development of a function block designer that can encapsulate generic process plans into function blocks for runtime execution. As function blocks can sense environmental changes on a shop floor, it is expected that a so-generated process plan can adapt itself to the shop floor environment with dynamically optimized solutions for plan execution and process monitoring.

  • 1557.
    Wang, Lihui
    et al.
    Department of Production Engineering, KTH Royal Institute of Technology, Sweden.
    Wang, Wei
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. Department of Production Engineering, KTH Royal Institute of Technology, Sweden.
    Liu, Dawei
    AVIC Chengdu Aircraft Industrial (Group) Ltd. Co., China.
    Dynamic feature based adaptive process planning for energy-efficient NC machining2017In: CIRP annals, ISSN 0007-8506, E-ISSN 1726-0604, Vol. 66, no 1, p. 441-444Article in journal (Refereed)
    Abstract [en]

    This paper presents a dynamic feature based adaptive process planning approach that can optimise machining cost, machining time and energy consumption simultaneously. The material removal volume of a dynamic feature is refined into non-overlapping volumes removed respectively by a single machining operation in which unified cutting mode is performed. Benefitting from this refinement, energy consumption is estimated analytically based on instantaneous cutting force as a function of real cutting parameters. Moreover, the cutting parameters assigned to each machining operation are optimised effectively in the unified cutting mode. This novel approach enhances the energy efficiency of NC machining through process planning.

  • 1558.
    Wang, Lihui
    et al.
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    Yang, Xiaoyu
    School of Applied Science & Technology, Fanshawe College, London, ON, Canada.
    Assembly operator training and process planning via virtual systems2011In: International Journal of Sustainable Engineering, ISSN 1939-7038, E-ISSN 1939-7046, Vol. 4, no 1, p. 57-67Article in journal (Refereed)
    Abstract [en]

    In this paper, we present an integrated intuitive system for assembly operators training and assembly process planning by combining virtual reality with motion-tracking technologies. The developed conceptual prototype for assembly planning and training enables individuals to interact with a virtual environment in real time. It extends the new technologies of motion tracking and integrates them with virtual environment technologies to create real-time virtual work cell simulations in which assembly operators may be immersed with hands-on experiences. In addition to operators training, the experimental results to date are presented to demonstrate the potential contributions of human skills in achieving effective assembly planning including disassembly operations. It is expected that this approach will lead to environment-friendly and sustainable operations by conserving energy and cost that are first tested in a human-emerged virtual system.

  • 1559.
    Wang, Wei
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Bandaru, Sunith
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Sánchez de Ocãna Torroba, Adrian
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Improved Human-Robot Collaboration Through Simulation-Based Optimization2019In: Advances in Manufacturing Technology XXXIII: Proceedings of the 17th International Conference on Manufacturing Research, incorporating the 34th National Conference on Manufacturing Research, 10–12 September 2019, Queen’s University, Belfast, UK / [ed] Yan Jin, Mark Price, Amsterdam: IOS Press, 2019, Vol. 9, p. 153-158, article id 10.3233/ATDE190027Conference paper (Refereed)
    Abstract [en]

    In order to pursue the dream combination of human flexibility and robot automation, human robot collaboration (HRC) is increasingly being investigated through academic research and industrial scenarios. HRC involves several challenges ranging from safety and comfort of the human to process efficiency and cost of robot operation. Achieving the right balance between these aspects is critical to implementing a safe, profitable and sustainable HRC environment. In this paper,we propose the use of simulation-based optimization (SBO) for assembly task allocation and scheduling for a HRC working cell in which an industrial robot assists a human worker. The list of product assembly operations are classified according to the capability of human worker and robot, and the sequencing constraints on them are the initial inputs of the method. The operators’ ergonomic load scores and cycletime of the assembly process are achieved by simulation. The optimized solutions are sorted to find the trade-offs between ergonomics and cycle time. We demonstratethe feasibility of the proposed approach through an industrial case study.

  • 1560.
    Wenäll, Johan
    University of Skövde, School of Technology and Society.
    Högskolan i Skövde tränar inför IPMA-certifiering2012In: Projektvärlden, ISSN 1652-3016, no 3, p. 29-29Article in journal (Other (popular science, discussion, etc.))
  • 1561.
    Werner, Elin
    University of Skövde, School of Engineering Science.
    Materialanalys & optimering av hydrauliska högtryckskopplingar med hjälp av simuleringar2018Independent thesis Basic level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Optimizing the burst pressure with finite element analysis is done on the FEM ½” coupling at Parker Hannifin AB. The critical components which is the ball cage, guide and plug housing are in focus. A more accurate material analysis is done to make a more real-based data of the material in the coupling.  

    After being in contact with the company that performs the hardening of the component, the entire plug housing is assumed to be hardened. For more information about material data, static pressure test is performed on a coupling. The measured strains from the tests are compared to the strains in the simulations. The tensile strength and hardness coefficient on the guide and ball cage can be adjusted slightly from the tests, but the result has several uncertainties. 

    The number of balls can be reduced, numbers of balls between 15 and 12 are investigated at request from the company. Analysis of how hardening of the material for the guide is done and hardening of the surface for the plug housing. 

    The smallest deformation occurs when hardening the guide. The ball cage clearly demonstrated minor deformations and stresses as the number of balls is reduced from 15 to 12 balls in the coupling. To reduce the burst pressure on the plug housing, it is recommended to harden the surface with a 27 % harder surface than the current. Due to estimated values of material data on hardened surface, more information is needed to determine the thickness needed on the surface of the hardening when having 12 balls in the coupling. 

  • 1562.
    Wibeck, Eleonore
    et al.
    University of Skövde, School of Technology and Society.
    Nydélius, Loui
    University of Skövde, School of Technology and Society.
    Ljussättnings- och andra behovslösningar för applikation på dörrar2009Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    This is a degree project for a bachelor in integrated product development. A work carried out during spring 2009 made by two design engineer students at the University of Skövde. The degree project has been done cooperating with a company that produces doors. The aim of the project has been to find a new way of implementing light and other need solutions to a door.

    One main part of the project involves finding and identifying the user’s needs which later were the foundation for the final outcome. With this as a start, a development phase began which consists of an iterative process with methods of creativity. This process has resulted in different conceptual ideas which has all been evaluated and finally reduced into four solutions. These have been visualized by Cad-software which have been chosen for its ability to show materials and constructions in an easy way.

    The final concepts has further on been developed in areas like abrasion resistance, choice of materials, calculation costs of components, control of existing patent and so on. This degree project define the design process from the first gathering of data to the final result and also a description of all the methods used in the project.

  • 1563.
    Wiemann, Marcus
    University of Skövde, School of Engineering Science.
    Implementering av människa-robot samarbetscell i en labbmiljö: Implementation av människa-robot samarbete2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In a previous final year project, a study was carried out on how a robotic collaborative cell would work in a laboratory environment. In Arvid Bobergs "HRC Implementation in laboratory environment" the cell would be developed on behalf of Eurofins to work with chemical and microbiological analyses in agriculture, food and environment. To verify the suggested solutions, an implementation would need to be designed in a physical environment.

    The main purpose of the project was to develop a collaborative cell that would perform tasks in a lab environment. For this purpose, a station, work operations and components have been developed and implemented at ASSAR. The station has been programmed to showcase the possibilities the robot has to offer in a collaborative cell with the help of ABB Robot Studio and online programming. The choice of the robot was if possible, to make use of ABB's YuMi robot. This is because it was the robot that the pre-study that the work is based on used in its model and built its theory on and because the work of the feasibility study is the foundation of this project.

    The implementation of the station has been completed in steps to be able to test different structure and obtain a better understanding of the robot's characteristics and what it is capable to perform in relation to range and flexibility. To create the more advanced features of the program was used offline programming in ABB Robot Studio combined with the help of online programming. The functions become too advanced to write in a TeachPendant because there will be long lines of code to create the advanced functions that the robot uses to perform its tasks.

    The work at ASSAR has led to several different solutions being developed and thought over until a concept has been chosen and implemented at ASSAR. This in the form of a collaborative cell that showcases various functions to perform tasks in a lab environment using the YuMi robot from ABB and a worktable created during the project.

    The project has achieved several goals for the work, but some have not been achieved, because of delays that have arisen during the course of the project. The delays have made the workflow change and the result that the author has tried to achieve has changed to develop a collaborative cell and give a result to the project.

  • 1564.
    Wigblad, Rune
    University of Skövde, School of Business.
    Modernisera Sverige!: Om snabba tåg som kommer i tid2018Report (Other (popular science, discussion, etc.))
  • 1565.
    Wikström, Mathilda
    University of Skövde, School of Humanities and Informatics.
    Tryggt och otryggt: Geometriskt uppbyggda fantasyskogar2012Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Denna studien har undersökt hur bilden av en fantasyskog förändras då man varierar dess grundformer. Undersökningen använde sig av en kvantitativ metod och genomfördes genom en webbenkätundersökning på sex olika forum. Enkäten innehöll sex geometriskt uppbyggda fantasyskogar med varsin geometrisk form som byggsten. De former som användes var uppåtpekande trianglar, liggande rektanglar, cirklar, kvadrater, stående rektanglar och nedåtpekande trianglar. Varje skogsvariant hade tre tillhörande slutna frågor och en öppen fråga för ytterligare kommentarer.

    Undersökningen visade att förändringen av grundformerna i en fantasyskog kan förändra uppfattningen om den. Det visade sig att den form som upplevdes som tryggast var cirkeln och den form som upplevdes som otryggast var den nedåtpekande triangeln. En vidareutveckling av undersökningen skulle kunna vara att bygga upp virtuella skogar baserade på geometriska former, där respondenter får uppleva skogarna i en virtuell miljö. Flera alternativa fortsättningar på denna studie föreslås i slutet av detta arbete.

  • 1566.
    Wiktorsson, Magnus
    et al.
    KTH Royal Insitute of Technology, Dept of Sustainable Production Development, Södertälje, Sweden.
    Noh, Sang Do
    Sungkyunkwan University, Dept of Industrial Engineering, Suwon, South Korea.
    Bellgran, Monica
    KTH Royal Insitute of Technology, Dept of Sustainable Production Development, Södertälje, Sweden.
    Hanson, Lars
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. Scania CV, Global Industrial Development, Södertälje, Sweden.
    Smart Factories: South Korean and Swedish examples on manufacturing settings2018In: Procedia Manufacturing, E-ISSN 2351-9789, Vol. 25, p. 471-478Article in journal (Refereed)
    Abstract [en]

    What constitutes a company's capabilities to develop a Smart Factory? South Korean and Swedish perspectives are here illustrated by company examples of smart factory solutions and related strategic aspects of their digitalization. It is concluded that the "smart-factory-capability" of a manufacturing company is integrated with its corporate production systems and includes perspectives on application areas, value adding processes as well as enabling technologies. It is furthermore challenged by the transformational inabilities of legacy systems. By its concrete examples is use and financial benefits, the paper contributes to the definition of the smart factory and its corresponding development scheme. 

  • 1567.
    Wilenius, Maria
    et al.
    Center for Cognitive Neuroscience, University of Turku, Turku, Finland / Department of Psychology, Åbo Akademi University, Turku, Finland / Center for Cognitive Neuroscience, University of Turku, FIN-20014 Turku, Finland.
    Revonsuo, Antti
    University of Skövde, School of Humanities and Informatics.
    Timing of the earliest ERP correlate of visual awareness2007In: Psychophysiology, ISSN 0048-5772, E-ISSN 1469-8986, Vol. 44, no 5, p. 703-710Article in journal (Refereed)
    Abstract [en]

    The earliest reliably occurring event-related brain potential (ERP) correlate of visual awareness (visual awareness negativity, VAN) emerges after 100 ms and peaks between 200 and 300 ms from stimulus onset. In a study using low-contrast stimuli, VAN was significantly delayed, peaking at 460 ms (V. Ojanen, A. Revonsuo, & M. Sams, 2003). In that study physical differences between the conscious and nonconscious stimuli may have confounded the results. Here we explored whether VAN is similarly delayed for physically identical stimuli. We presented low-contrast stimuli near an individually determined subjective contrast threshold. A delayed VAN peaked at 400 ms at occipito-temporal sites to subjectively perceived stimuli. Our results support the interpretation that VAN is the earliest ERP correlate of phenomenal visual awareness. The electrophysiological processes eliciting VAN may become delayed as a function of the difficulty of the early perceptual discrimination.

  • 1568.
    Wilhelmsson, Ulf
    et al.
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Engström, Henrik
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Brusk, Jenny
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Östblad, Per Anders
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Inclusive game design facilitating shared gaming experience2017In: Journal of Computing in Higher Education, ISSN 1042-1726, E-ISSN 1867-1233, Vol. 29, no 3, p. 574-598Article in journal (Refereed)
    Abstract [en]

    This article presents the result from a study comparing the perception and understanding of a game story between sighted and visually impaired players playing the same game. In particular, whether sighted and visually impaired players could experience and recount the same story construed from the plot elements that are either manifested by audio and graphics in the case of sighted players or pri- marily by audio in the case of visually impaired players. To this end, we have developed a graphical point-and-click adventure game for iOS and Android devices that aims to show how inclusive game design may be used to facilitate a shared gaming experience between sighted and visually impaired players. The game pro- vides players with audio feedback that enables visually impaired players to interact with and experience the game, but in a manner that does not interfere with the overall appearance and functionality of the game. Thus, it has been designed to be fully inclusive to both groups of players and to give the same gaming experience when it comes to story content. The game has been evaluated through formal user tests where subjects have been asked to play the first chapter of the game followed by an interview. The study shows that the perception of the story was almost identical between the two groups. Generally it took visually impaired players a little longer to play the game but they also seem to listen more carefully to the dialogue and hence also build a slightly deeper understanding of the characters. The study also shows that the sighted players did not respond negatively towards the inclusive game design employed in the game. 

  • 1569.
    Wilhelmsson, Ulf
    et al.
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Engström, Henrik
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Brusk, Jenny
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Östblad, Per-Anders
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Accessible Game Culture using Inclusive Game Design: Participating in a visual culture that you cannot see2015In: VS-Games 2015: 7th International Conference on Games and Virtual Worlds for Serious Applications / [ed] Per Backlund, Red Hook, NY: IEEE Computer Society, 2015, p. 147-154Conference paper (Refereed)
    Abstract [en]

    In this paper, we present the result of an experiment, in which we compare the gaming experience between sighted players and visually impaired players playing the same game. Specifically we discuss whether they experience the same story construed from the plot elements that are either manifested by audio and graphics in the case of sighted players or primarily by audio in the case of visually impaired players. To this end, we have developed a graphical point-and-click adventure game for iOS and Android devices. The game has been designed to provide players with audio feedback that enables visually impaired players to interact with and experience the game, but in a manner that does not interfere with the overall appearance and functionality of the game, i.e. a design that is fully inclusive to both groups of players and that is as invisible for sighted players as possible without hindering visually impaired players to share the same gaming experience when it comes to story content. The study shows that the perception of the story were almost identical between the two groups. Generally it took visually impaired players a little longer to play the game but they also seem to listen more carefully to the dialogue and hence also build a slightly deeper understanding of the characters.

  • 1570.
    Wilhelmsson, Ulf
    et al.
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Toftedahl, Marcus
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Susi, Tarja
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Torstensson, Niklas
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Sjölin, Anders
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Tuori, Petri
    LBS Borås, Sweden.
    A Computer Game for an Enhanced Visitor Experience: Integration of Reality and Fiction2014In: Proceedings of the International Conference on Interfaces and Human Computer Interaction 2014 Game and Entertainment Technologies 2014 and Computer Graphics, Visualization, Computer Vision and Image Processing 2014 - Part of the Multi Conference on Computer Science and Information Systems, MCCSIS 2014 / [ed] Katherine Blashki & Yincai Xiao, IADIS Press, 2014, p. 149-156Conference paper (Refereed)
    Abstract [en]

    This paper describes the development of a computer game for enhanced visitor experiences of an adventure tour, in which the game is integrated. The game project was run 2011-2013 and included the development of an arcade style two player cooperative computer game, game controls, graphics, sound and music. The adventure tour takes place in an old military fortress where visitors participate in searching for gold that has been stolen. The tour starts with a 3D movie that provides the plot and introduces hero and villain characters. The story is then carried forth by a game master who brings the visitors on a tour along the fortress’ vaults, during which they also play the computer game. The adventure tour is structured by a semi-fictional framing story that interweaves history, physical environment, and hero and villain characters. To withhold interdependency in the overall design of the adventure tour and the game, Caillois’s (1958/2001) taxonomy for games was chosen as a basis, combined with narrative key elements carried across the adventure tour. The game was also designed to accord with the embodied nature of human activity, allowing players to engage their whole bodies in the gameplay. Initial game evaluation results indicate the game contributes to an enhanced visitor experience of the adventure tour.

  • 1571.
    Wingren, Magdalena
    University of Skövde, School of Technology and Society.
    Windscreen study using a free moving headform: An investigation of windscreen behaviour when subjected to headform impact2011Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Pedestrian protection performance becomes more and more in focus for the car manufactures and systems to reduce injury risk are under development. A wider understanding of both the present and the future windscreen performance in free moving headform testing is needed to optimize these systems. The purpose of this thesis was therefore to learn and understand windscreen behaviour when subjected to head impact and to gain knowledge of CAE status for head impact in windscreens from a pedestrian point of view.

    A literature review concluded that there are different ways to model a windscreen. It was found that the computer material models for laminated windscreen glass were not capable of fully representing the behaviour of this material under all impact conditions, particularly the non-linear behaviour after fracture or failure.

    Experimental testing on three different windscreen models, with a free moving headform in a horizontal impactor, has been performed. Test set up was according to Euro NCAP pedestrian testing protocol and three different windscreen angles were tested. The parameter investigated was curvature and HIC and deformation depth on the windscreen were used as evaluation tools. Deformation was measured with a laser positioned behind the windscreen at impact. Film analysis and integration of headform accelerations were used as comparison. The testing concludes that different curvature alone will not have a big influence on HIC and deformation.

     

    Keywords: PVB laminated windscreen, pedestrian, impact, free moving headform

  • 1572.
    Winzig, Manuel
    University of Skövde, School of Engineering Science.
    Modelling and optimisation of a production system including Human-Automation collaboration2019Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis is part of the ManuWork project. ManuWork is led by the European Union trying to cope with recent emerging challenges in the field of automation engineering. One of these challenges is to satisfy customer demands of high product variability and product specification. This urges production lines to become highly flexible while being efficient at the same time. To solve this problem, one approach is to introduce human-automation collaboration to warrant both, efficiency and flexibility. This work supports this goal by developing a simulation model including human-automation collaboration to find out its benefits and requirements. The first step was performing a literature review on the state of the art of the theory of line balancing. It was also investigated how today’s optimisation methods solve complex line balancing problems. Based on this, a simulation model of a production line of a Swedish manufacturer was built in the simulation software FACTS. This simulation model was then complemented by various features step by step. Besides the human-automation collaboration, the final model also contains influences like human task time deviation, machine disruption, buffer size and worker performance. The production system was then studied in detail using simulation software. By conducting a simulation study information about the system’s behaviour was obtained. The influence of the system’s features on the critical parameters throughput, work in process and lead time was studied. The behaviour of the human-automation collaboration was studied in-depth. It was shown what requirements are to be met to realise a beneficial implementation and quantified which improvements can be expected by an implementation. At the end, the project is concluded, and an outlook on possible future researches is given.

  • 1573.
    Wolak, Peter
    et al.
    University of Skövde, School of Engineering Science.
    Johansson, Mattias
    University of Skövde, School of Engineering Science.
    Buffer optimisation of a packaging line using Volvo GTO's flow simulation methodology2019Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    With the rapid development of computers and their proven usability in manufacturing environments, simulation-based optimisation has become a recognised tool for proposing near-optimal results related to manufacturing system design and improvement. As a world-leading manufacturer within their field, Volvo GTO in Skövde, Sweden is constantly seeking internal development and has in recent years discovered the possibilities provided by flow simulation. The main aim of this thesis is to provide an optimal buffer size of a new post-assembly and packaging line (Konpack) yet to be constructed. A by-product of the flow simulation optimisation project in form of a flow simulation process evaluation was also requested.

    The simulation project started with a pre-study including the development of the frame of reference and an analysis of the literature focused on merging Lean philosophy with simulation-based optimisation. The simulation model was built based on both historical and estimated data. The optimisation results showed different buffer size alternatives depending on the throughput to be achieved, these are discussed, and near-optimal solutions presented for decision-making. Additionally, four experiments were carried out, both contributing to the model’s credibility as well as providing new and valuable insight to the stakeholders. The conclusions drawn from the optimisation and experiments indicate that Konpack will be able to meet the established throughput goals, provided that the suggested near-optimal solutions are considered. The experiments also unanimously point to the fact that Konpack has a built-in overcapacity, utilizable by optimising certain suggested input parameters.

    Additionally, an evaluation of the completeness of the standard simulation process employed by Volvo GTO is provided, concluding that no major changes are needed. Nevertheless, there is always room for improvement. Hence, future work regarding the flow simulation process at Volvo GTO is proposed.

  • 1574.
    Wänerberger, Alexander
    et al.
    University of Skövde, School of Engineering Science.
    Said, Sayyed Hamid
    University of Skövde, School of Engineering Science.
    Lagerstyrning och prognostisering av råmateriallagret2014Independent thesis Basic level (university diploma), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Production to customer order usually requires keeping a supply warehouse. Increased customer demands for short lead-times require that materials must be in stock. This result in increasing stock levels in a company leads to more capital tied up and simultaneously leads to poorer yields. To avoid keeping a large storage warehouse whilst keeping a good service requires an effective inventory control.

    The purpose of this project is to find out how the demand looks like in the current situation of the company and to develop an appropriate forecasting method and calculation model against a certain pace for inventory control. The methods mentioned in this work are the ABC analysis, calculation of safety stock and forecasting methods.

    The results from this work will answer the objectives of the project aims. A variety of analyzes and experiments shall be used to investigate what type of forecasting method that the company should use. The methods and theories raised in the report also aims to be used by similar companies. The aim of the selected forecasting method is also to lead to a better base, from which better forecast precision is one part in order to improve the inventory management. This has, as far as possible, been put in relation to the working methods used in the company today. Some of the work has been to find out how much demand changes during the lead times, i.e. from the ordering of raw material until the material is in the raw material stock. This has also been used to compare forecasting methods against the present approach.

    Because the company wants to expand its production, a calculation model has also been developed. This model indicates the inventory level to a desired pace, i.e. demand level.

  • 1575.
    Xia, Johnny
    University of Skövde, School of Engineering Science.
    A NEW STUDY OF UNBALANCED PRODUCTION LINE WITH OPTIMIZATION2018Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This project is a continuous research of a topic well-known in the literature, namely, the performance study of unbalanced unpaced production system. In the literature, there were many studies that investigated the statistical outputs of an unbalanced production line using simulation. This project focuses on researching the outputs like average buffer level and idle time that are rarely studied in previous research by using optimization tools from discrete event simulation software FACTS.The models used in the article (Shaaban & McNamara, 2009) have been used as a guideline during the development of the simulation models for this project. Two simulation models were created, each using different discrete event simulation software, namely FACTS analyzer and Plant simulation. Those simulation models fulfills its role in verification & validation stage, with their statistical outputs compared to each other and with Shaaban and McNamara’s results. After verification & validation comes optimization of those simulation models, by using optimization tools from FACTS.The research area expanded during the optimization phase. Originally Shaaban et.al analyzed unbalanced production line with one fixed value of coefficient of variation. In order to expand the view on the properties of an unbalanced production line, three more coefficient variation were added with total of four in this project. As a result, 12 optimization results were created at the end of this project. Each optimization has 30 000 iterations to ensure its convergence.The first step of analysis is done by locating all Pareto-optimal solutions with optimization tools in FACTS. The raw data of all solutions are later transferred and converted into EXCEL files. Using scatter graph and putting all outputs against each other in EXCEL, it creates visual graph that can be used to analyze and to investigate interesting behavior in an unbalanced production line.The analysis on the optimization results showed several interesting behaviors from production line with different settings. One being that if a production line possess worse coefficient of variation than its competition. By raising the inter-stage buffer level of the production line with inferior coefficient of variation, it can achieve the same level, if not greater outputs than its competitor who possess better coefficient of variation. The other interesting behavior are optimization results with highest outputs in regard of either idle time or average buffer level, with deep analyzation using optimization tools from FACTS. Certain operation time pattern and inter-stage buffer pattern could be observed from those results.

  • 1576.
    Yang, Xiaoyu
    et al.
    National Research Council of Canada.
    Wang, Lihui
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    VR-Assisted Assembly Planning2009In: The International 3rd Swedish Production Symposium / [ed] B. G. Rosén, The Swedish Production Academy , 2009, p. 423-428Conference paper (Refereed)
    Abstract [en]

    In this paper, we present an intelligent assembly planning and training system combining virtual reality (VR) and motion tracking technologies. The development conceptual prototype for assembly planning and training enables individuals to interact with virtual environment in real time. It extends the new technologies of motion tracking and integrates them with virtual environment technologies to create real-time virtual work cell simulations in which workers may be immersed with hands-on experiences. The experimental results to date are presented to demonstrate the contributions of human skills in achieving intelligent assembly planning.

  • 1577.
    Younan Slewa, Ninos
    University of Skövde, School of Informatics.
    Säkerhetsutmaningar med metadatahantering: Utmaningar med insamlingen av personlig metadata via e-handelssystem2017Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The development and progress of the e-commerce system has dominated electronic trade in recent years. Problems that often arise are how confident is the handling of consumer data, specifically regarding the personal metadata that the user generates when shopping through the net. Many companies and organizations are investing a great deal in expanding their consumer services using market strategy Business-to-Consumer (B2C), but most collecting data have little attention to consistent documents that occur with the management of personal privacy, collection of personal metadata and the legal protection of this type of data. This paper addresses challenges with how personal metadata is handled and how it can be implemented to make the use less problematic. Survey in this paper found that the challenge lies mostly in the coordination between technology and law. IT experts must specify how metadata should be collected, how it should be stored and what should it be used for, while legal experts must qualify if metadata is to be treated as traditional data or whether it will have a specific legal system. Other findings such as the collection, storage and usage of metadata were also featured in this work.

  • 1578.
    Yousefi, Milad
    et al.
    Department of Production and Transportation Engineering, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
    Yousefi, Moslem
    Department of Mechanical Engineering, Islamic Azad University, Roudehen Branch, Roudehen, Iran.
    Fathi, Masood
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Fogliatto, Flavio
    Department of Production and Transportation Engineering, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
    Patient visit forecasting in an emergency department using a deep neural network approach2019In: Kybernetes, ISSN 0368-492X, E-ISSN 1758-7883Article in journal (Refereed)
    Abstract [en]

    This study aims to investigate factors affecting daily demand in an emergency department (ED) and to provide a forecasting tool in a public hospital for horizons of up to 7 days.In this study, first the important factors to influence the demand in EDs were extracted from literature then the relevant factors to our study are selected. Then a deep neural network is applied for constructing a reliable predictor.Although many statistical approaches have been proposed for tackling this issue, better forecasts are viable through employing the abilities of machine learning algorithms. Results indicate that the proposed approach outperforms statistical alternatives available in the literature such as multiple linear regression (MLR), autoregressive integrated moving average (ARIMA), support vector regression (SVR), generalized linear models (GLM), generalized estimating equations (GEE), seasonal ARIMA (SARIMA) and combined ARIMA and linear regression (LR) (ARIMA-LR).We applied this study in a single ED to forecast the patient visits. Applying the same method in different EDs may give us a better understanding of the performance of the model. The same approach can be applied in any other demand forecasting after some minor modifications.To the best of our knowledge, this is the first study to propose the use of long short-term memory (LSTM) for constructing a predictor of the number of patient visits in EDs.

  • 1579.
    Yu, Jesper
    et al.
    University of Skövde, School of Technology and Society.
    Karlsson, Daniel
    University of Skövde, School of Technology and Society.
    Conceptual mobile device with focus on design for recycling2011Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    One of the largest product categories within all the electronic products is portable ­computers, also known as notebooks, is slowly replacing stationary computers and is ­predicted to be the mainstream choice in the near future. But the current state of ­notebook shows these products are not accommodated for an effective large scale ­recycling process. As the notebooks are becoming more compact, its inner ­structures have become more complicated. Permanently fastening methods, multi-material ­compositions and many other factors contribute to an ineffective, expensive and tedious recycling process.

    The goal of the project treated in this report was to investigate the possibilities of a simplified structure adapted for an effective disassembly and recycling process. And to develop a conceptual notebook adapted for the stated purpose.

    The project resulted in a conceptual notebook named Sixten with an enhanced and ­simplified inner structure. All permanently fastening methods was replaced by ­detachable locking and securing devices. The number of tools required for dismantling was reduced, as the usage of screws. The variation of materials used in the notebook, with ­electrical components apart, is low. These materials, ABS plastics and aluminum were chosen based on their recyclable and processing possibilities. But also because of the durability and desired mechanical properties the structure required. The limited number of materials used in Sixten makes it environmentally beneficial since every material ­requires its own specific recycling process, and by reducing the number of materials energy can be saved on using only a few recycling methods.

    Sixten fulfills the principals of design for disassembly as a notebook that is easy to ­disassemble in comparison with notebooks on the market today. The disassembly time has been reduced, from the 45 minutes which may be required to fully disassemble a conventional notebook, down to an estimated disassembly time of 6 minutes, which is the time Sixten requires. It is in this short disassembly time where the economic benefits of Sixten lie.

  • 1580.
    Zdybal, Johan
    University of Skövde, School of Informatics.
    Grafiska stilars påverkan på spelupplevelsen: Kan den grafiska stilen påverka en spelares uppfattning av spelupplevelsen?2014Independent thesis Basic level (university diploma), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Detta arbete gick ut på att undersöka ifall två spelmekaniskt identiska spelprototyper med två olika grafiska stilar kunde påverka en spelares uppfattning av spelupplevelsen. Syftet var inte att undersöka hur det påverkar utan om det påverkar. Arbetet utgick ifrån att undersöka grafiska stilar, skapa två spelprototyper samt undersöka och bryta ner spelupplevelsen med hjälp av Swinks bok om Game Feel. Åtta respondenter deltog i speltest och intervjuer vilket ledde till data som kunde konstatera att en grafisk presentation, en grafisk stil, påverkar en spelares upplevelser av ett spel. Datan kan inte påvisa hur, däremot att det sker något, trots mekaniskt identiska spel. För framtida forskning vore det intressant att använda ett större och mer komplext spel för att ge ett längre och mer naturligt speltest för respondenterna samt för att likna de spel som finns tillgängliga i handeln idag.

  • 1581.
    Zeijlon, Robin
    et al.
    University of Skövde, School of Informatics.
    Waller, Vanja
    University of Skövde, School of Informatics.
    Hur virtuella verklighetsglasögon gör skillnad: En jämförelsestudie av ett multiplayerskräckspel med och utan virtuella verklighetsglasögon2019Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    I detta arbete undersöks på vilket sätt virtuella verklighetsglasögon förändrar en spelupplevelse. Primärt ligger fokus på vad fysisk immersion och sensorisk feedback kan tillföra till spelupplevelsen. Detta innefattar autenticitet och inlevelse.För att undersöka detta används en utav karaktärerna i multiplayerskräckspelet Strobophagia som är omgjord för att fungera med virtuella verklighetsglasögon. I varje test fick en försöksdeltagare spela den omgjorda karaktären och dess originalversion medan en försöksdeltagare fick agera som motståndare och spela den icke omgjorda karaktären.Resultatet visar tydligt på att versionen i virtuell verklighet föredras av försöksdeltagare då den har ökad immersion och användbarhet. Fortsättningsvis anses den även vara mindre av ett spel och mer som en upplevelse. I framtiden behöver detta testas på fler spel och genrer för att säkerhetsställa att resultatet inte är unikt för Strobophagia.

  • 1582.
    Zetterberg, Stefan
    et al.
    University of Skövde, School of Technology and Society. University of Skövde, School of Technology and Society.
    Into, Camilla
    University of Skövde, School of Technology and Society.
    Transitlager som en strategi i ett globalt distributionssystem2009Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Nuförtiden är det stora flertalet försörjningskedjor internationella till sin karaktär och trenden går alltmer mot fokuserade fabriker. Det innebär att ett fåtal fabriker som var och en fokuserar på ett fåtal produkter tar hand om produktionen för hela världsmarknaden. Då tillverkningen sker på få utvalda platser och marknader världen över ska försörjas ifrån dessa krävs ett globalt distributionssystem som ska klara av att hantera den ökade konkurrensen, kundernas krav på kortare ledtider och den ökade differentieringen av produkter.

    Det finns olika strategier för att hantera ett globalt distributionssystem. Syftet med denna uppsats är att utreda om en transitlagerstrategi kan vara ett konkurrenskraftigt komplement eller alternativ till de mer vanligt förekommande distributionsstrategierna. Studien har gjorts genom att skapa ett teoretiskt ramverk vilket beskriver hur det globala distributionssysteme kan hanteras. Med förutsättningen att företagen idag har ett globalt distributionssystem måste de kunna distribuera sina varor över hela världen och teorin behandlar tre distributionsstrategier för att hantera detta och det är centraliserad distributionsstrategi, decentraliserad distributionsstrategi och transitlagerstrategi. De olika distributionsstrategiernas egenskaper samt för- och nackdelar beskrivs för att avgöra i vilka affärsmiljöer respektive strategi lämpar sig.

    Det teoretiska ramverket behandlar hur företag kan välja mellan och kombinera de olika distributionsstrategierna utifrån deras förutsättningar att produkterna ska nå många marknader från ett fåtal fabriker. För att underlätta valet av distributionsstrategi har en matris konstruerats i ramverket. Matrisen bygger på ett antal utvalda variabler vilka är viktiga att ta hänsyn till. Avslutningsvis när en strategi eller en kombination av strategier är vald ska teorin behandla hur företagen praktiskt kan arbeta med de olika strategierna.

    Empirin kommer att redogöra för två fallstudier där de olika företagen är Etylenaminer och Eka Chemicals. Det kommer att beskrivas hur deras distributionssystem ser ut idag, vilka distributionsstrategier som de använder samt hur de arbetar praktiskt med dem.

    I analysen har det teoretiska ramverket ställts emot den insamlade empirin för att utreda om transitlagerstrategin kan vara ett konkurrenskraftigt komplement till den centrala distributionsstrategin och den decentraliserade distributionsstrategin. Den slutsats som forskningen leder fram till är att det finns mer än ett sätt att strukturera distributionssystemet på och genom det bli framgångsrik på en global marknad. Oavsett vilket distributionssystem ett företag har byggt upp kan transitlagerstrategin utgöra ett bra komplement eller alternativ till den centraliserade distributionsstrategin och den decentraliserade distributionsstrategin för att vinna konkurrensfördelar på marknaderna. Transitlagerstrategin kan bland annat ge upphov till kortare ledtider än vad som kan uppnås med den centraliserade distributionsstrategin och mindre kapitalbindning än vad tillämpningen av den decentraliserade distributionsstrategin ger genom att produkten inte behöver lagras lokalt för att erbjuda kunden korta ledtider. Forskningen visar vidare på att det tar mycket lång tid att utveckla en renodlad transitlagerstrategi men att företagen redan i de tidiga utvecklingsfaserna av strategin kan tillgodogöra sig stora konkurrensfördelar.

  • 1583.
    Zetterström, Viktor
    University of Skövde, School of Informatics.
    Väderlek: En studie i hur väder och klimatpåverkan på karaktärer i spel uppfattas av spelare2015Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Väder och klimat finns alltid i verkliga livet och ofta i spel. Men i spelen är det inte alltid vädret fungerar som det gör i verkligheten. Man kan säga att det finns tre kategorier av väder/klimatpåverkan på karaktärer i spel. En där vädret/klimatet inte påverkar karaktären, en där gameplay påverkas av det och en där karaktären också påverkas. Vilken av dessa nivåer föredrar de som spelar? Genom att skapa tre nästan identiska animationer med karaktären Super Mario, med dessa nivåer som skillnaderna, testas detta i denna studie. Efter att undersökningen var utförd visade det sig att den nivå som flest föredrog var den sista, där karaktären och gameplay påverkades. Det skulle gå att utveckla denna undersökning och användafler spel med olika genrer för att se om uppfattningen om väder/klimatpåverkan skiljer sig beroende på genre. Studiens resultat visar indikationer på detta.

  • 1584.
    Zhang, Dan
    et al.
    University of Ontario Institute of Technology.
    Wang, Lihui
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Gao, Zhen
    University of Ontario Institute of Technology.
    An integrated approach for remote manipulation of a high-performance reconfigurable parallel kinematic machine2010In: Journal of manufacturing systems, ISSN 0278-6125, E-ISSN 1878-6642, Vol. 29, no 4, p. 164-172Article in journal (Refereed)
    Abstract [en]

    Flexible and effective manipulation is important and meaningful for the further development and applications of parallel manipulators in the industrial fields, especially for high performance manufacturing. Web-based manufacturing has emerged as an alternative manufacturing technology in a distributed environment. In this paper, an integrated approach is proposed for remote manipulation of the reconfigurable parallel kinematic machine (RPKM) based on sensor-driven Wise-ShopFloor framework. The concept of Wise-ShopFloor integrates the modules of detailed architecture design, module interactions, sensor data utilization and model predictive control. In order to demonstrate the efficiency of this novel methodology, an example of a five degrees-of-freedom (DOF) RPKM is developed for surface finishing. The reconfigurability, the necessary kinematic analysis, and the performance mapping of the 5-DOF RPKM are conducted so as to implement the proposed approach.

  • 1585.
    Zhang, Dan
    et al.
    School of Mechanical and Power Engineering, Nanjing University of Technology, China / Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, Oshawa, Canada.
    Wang, Lihui
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    Gao, Zhen
    Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, Oshawa, Canada.
    Su, Xiaoping
    School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing, China .
    On performance enhancement of parallel kinematic machine2013In: Journal of Intelligent Manufacturing, ISSN 0956-5515, E-ISSN 1572-8145, Vol. 24, no 2, p. 267-276Article in journal (Refereed)
    Abstract [en]

    This paper proposes a spatial three degrees of freedom (DOF) parallel kinematic machine enhanced by a passive leg and a web-based remote control system. First, the geometric model of the parallel kinematic machine is addressed. In the mechanism, a fourth kinematic link-a passive link connecting the base center to the moving platform center-is introduced. Each of the three parallel limbs is actuated by one prismatic joint, respectively. The additional link has three passive DOF, namely two rotations around x and y axes and one translation along z axis. With the existence of this link, the unwanted motion of the tool (located in the moving platform) is constrained. The fourth link also enhances the global stiffness of the structure and distributes the torque from machining. With the kinematic model, a web-based remote control approach is applied. The concept of the web-based remote manipulation approach is introduced and the principles behind the method are explored in detail. Finally, a remote manipulation is demonstrated to the proposed structure using web-based remote control concept.

  • 1586.
    Zhang, Xiaoyang
    et al.
    Faculty of Engineering, Environment and Computing, Coventry University, Coventry, United Kingdom.
    Lu, Xin
    Faculty of Engineering, Environment and Computing, Coventry University, Coventry, United Kingdom.
    Wang, Sheng
    Faculty of Engineering, Environment and Computing, Coventry University, Coventry, United Kingdom.
    Wang, Wei
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Li, Weidong
    Faculty of Engineering, Environment and Computing, Coventry University, Coventry, United Kingdom.
    A multi-sensor based online tool condition monitoring system for milling process2018In: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 72, p. 1136-1141Article in journal (Refereed)
    Abstract [en]

    Tool condition monitoring has been considered as one of the key enabling technologies for manufacturing optimization. Due to the high cost and limited system openness, the relevant developed systems have not been widely adopted by industries, especially Small and Medium-sized Enterprises. In this research, a cost-effective, wireless communication enabled, multi-sensor based tool condition monitoring system has been developed. Various sensor data, such as vibration, cutting force and power data, as well as actual machining parameters, have been collected to support efficient tool condition monitoring and life estimation. The effectiveness of the developed system has been validated via machining cases. The system can be extended to wide manufacturing applications.

  • 1587.
    Zhou, Bo
    et al.
    German Research Center for Artificial Intelligence, Kaiserslautern, Germany / University of Kaiserslautern, Kaiserslautern, Germany.
    Cruz, Heber Zurian
    German Research Center for Artificial Intelligence, Kaiserslautern, Germany / University of Kaiserslautern, Kaiserslautern, Germany.
    Atefi, Seyed Reza
    Swedish School of Textiles, University of Borås, Borås, Sweden.
    Billing, Erik
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Seoane, Fernando
    Inst. for Clinical Science, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden / Dept. Biomedical Engineering, Karolinska University Hospital, Stockholm, Sweden / Swedish School of Textiles, University of Borås, Borås, Sweden.
    Lukowicz, Paul
    German Research Center for Artificial Intelligence, Kaiserslautern, Germany / University of Kaiserslautern, Kaiserslautern, Germany.
    TouchMe: Full-textile Touch Sensitive Skin for Encouraging Human-Robot Interaction2017Conference paper (Refereed)
  • 1588.
    Zhou, Bo
    et al.
    German Research Center for Artificial Intelligence, Kaiserslautern, Germany.
    Velez Altamirano, Carlos Andres
    Department Computer Science, University of Kaiserslautern, Kaiserslautern, Germany.
    Cruz Zurian, Heber
    Department Computer Science, University of Kaiserslautern, Kaiserslautern, Germany.
    Atefi, Seyed Reza
    Swedish School of Textiles, University of Borås, Borås, Sweden.
    Billing, Erik
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Seoane Martinez, Fernando
    Swedish School of Textiles, University of Borås, Borås, Sweden / Institute for Clinical Science, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden / Department Biomedical Engineering, Karolinska University Hospital, Stockholm, Sweden.
    Lukowicz, Paul
    German Research Center for Artificial Intelligence, Kaiserslautern, Germany / Department Computer Science, University of Kaiserslautern, Kaiserslautern, Germany.
    Textile Pressure Mapping Sensor for Emotional Touch Detection in Human-Robot Interaction2017In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 17, no 11, article id 2585Article in journal (Refereed)
    Abstract [en]

    In this paper, we developed a fully textile sensing fabric for tactile touch sensing as the robot skin to detect human-robot interactions. The sensor covers a 20-by-20 cm2 area with 400 sensitive points and samples at 50 Hz per point. We defined seven gestures which are inspired by the social and emotional interactions of typical people to people or pet scenarios. We conducted two groups of mutually blinded experiments, involving 29 participants in total. The data processing algorithm first reduces the spatial complexity to frame descriptors, and temporal features are calculated through basic statistical representations and wavelet analysis. Various classifiers are evaluated and the feature calculation algorithms are analyzed in details to determine each stage and segments’ contribution. The best performing feature-classifier combination can recognize the gestures with a 93.3% accuracy from a known group of participants, and 89.1% from strangers.

  • 1589.
    Zia, Muhammad Irfan
    University of Skövde, School of Technology and Society.
    Production Control MechanismsComparison using Multi-ObjectiveSimulation Optimization2009Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    The choice of an efficient and effective production control mechanism (PCM)along with the appropriate buffer allocation pattern is very important for anyproduction engineer/decision maker when designing a production line in order toattain the required system performance. This project work aims to give an insightwith different PCMs, different buffer allocation patterns and arrangement ofworkers of different capability to help the production engineers/decision makersto select the right mechanism and pattern. This study has been performed withmulti-objective simulation optimisation (MOSO) tool. The result from manyexperiments have shown that the ascending buffer allocation pattern stands outas the prominent choice when the goal was to attain maximum throughput (TP)and simultaneously keeping minimum cycle time (CT) and work in process (WIP).The PCMs and workers imbalance patterns performance is different in differentregions of the Pareto-optimal CT-TP data plots obtained from MOSO so theirselection is depending on the interest of the desired level of throughput togetherwith the limit of cycle time.

  • 1590.
    Zia, Muhammad Irfan
    et al.
    University of Skövde, School of Technology and Society.
    Cortés Mora, Felipe
    University of Skövde, School of Technology and Society.
    Automation of packing process2008Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    The design work that precedes the automation of a process is not an easy job. Each one of the variables and possible risks involved in process must be carefully considered before implement the final design as well the requirements in performance and cost. However automate a dangerous, inefficient or just uncomfortable task entails many benefits that make up for the long period of design process. A well automated line will benefit the production with quality, productivity and capacity among other profits. In this project the immediate objective is to automate the “SANDFLEX Hacksaw blades” packaging process in the plant that SNAEurope owns in Lidköping. Actually the packing is completely manual. One operator packs the blades into the boxes meanwhile one more operator loads and unloads the packing station with empty and full boxes respectively. The task is both, tiring and uncomfortable for the operators as well inefficient for the company since the production rate is limited.

    Analyzing and observing carefully product and process, different theories and strategies to achieve the goal were developed. Three are the possible solutions to solve the problem, with different levels of automation and technologies. The robotic solution uses an articulated robot to perform all the tasks; the hybrid solution uses pneumatic devices to pack the blades and an articulated robot to support the station loading and unloading the boxes. Finally the pneumatic solution uses only pneumatic devices, which hold, open and close, push box and blades using airpower; a few sensors detect positions and states, since a PLC coordinates and controls all process. By means of discussing these solutions with the company’s engineers and workers, after a deep literature study and two test of performance, was it possible to select the most suitable solution to accomplish the packaging task. The pneumatic solution is cheap and simple, but at the same time robust and reliable. This design performs the packaging task efficiently and fast. And more important, the operator passes from pack manually the blades to monitor the process.

  • 1591.
    Ziemke, Tom
    University of Skövde, School of Humanities and Informatics. University of Skövde, The Informatics Research Centre.
    The Construction of Embodied Agency: The Other Side of the System-Environment Coin2012In: Constructivist Foundations, ISSN 1782-348X, E-ISSN 1782-348X, Vol. 8, no 1, p. 52-53Article in journal (Other academic)
    Abstract [en]

    > Upshot . Complementary to Alroe and Noe's discussion of constructivist notions of environment, world, etc., this commentary addresses the closely-related notion of agency in constructivist theories - in particular, the question of what would be required for artificial agency - and identifies open questions and fundamental disagreements among constructivist theorists.

  • 1592.
    Ziemke, Tom
    et al.
    University of Skövde, School of Humanities and Informatics. University of Skövde, The Informatics Research Centre.
    Lowe, Robert
    University of Skövde, School of Humanities and Informatics. University of Skövde, The Informatics Research Centre.
    Morse, Anthony
    Univ Plymouth, Plymouth PL4 8AA, Devon, England.
    Affective robotics - modelling emotion and motivation2010In: Connection science (Print), ISSN 0954-0091, E-ISSN 1360-0494, Vol. 22, no 3, p. 193-195Article in journal (Other academic)
  • 1593.
    Zini, Omar
    University of Skövde, School of Technology and Society.
    A simplified forging simulation tool: validation with finite element method2013Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Nowadays, the forging industry has a great importance in the fabrication of metallic parts. Therefore, new theoretical models, or modifications to others already existing, continuously appear to improve the process. New investigations culminated, recently, in equations designed to obtain the necessary pressure to forge a part. The purpose is to have a fast, not expensive and efficient alternative to the numerical methods in such calculation. With the double intention of divulgating this new theory created in the University of Málaga (Spain) and confirming its validity, it is interesting to carry out a comparison with the finite element method. In this comparison, geometrical factors relative to the workpiece (part subjected to forging) and the friction coefficient come into play. The goal is then to find validity ranges in the equations for the variables previously mentioned, with the aim to delimit those forging situations in which they could be applied. The implementation of these variables into the commercial FE-code Abaqus is simple, although two aspects arise: the meshing and the correct modeling of the contact between the workpiece and the upper die. The limitation of the Abaqus Student Version (used throughout the analyses) in the allowed number of nodes, prevented performing sufficiently dense meshes. Many alternatives are investigated that, unfortunately, do not show any satisfactory result for the simulation of the process. Performing forging simulations is quite complex and requires a great knowledge in the field and an extraordinary knowledge of how different elements work in large plastic strain. However, this project leaves a collecting data method and a procedure to determine the initial geometry of the workpiece to ensure plastification and to reach a determined shape factor after the forging. The most important is that the way to further analyses has been cleared by confirming the suitability for certain parameters in the simulation (element type, non-linear geometry, contact model, etc.). The recommendation for future simulation efforts is to use ALE (Arbitrary Lagrangian-Eulerian) adaptive meshing.

  • 1594.
    Zryd, Viktor
    University of Skövde, School of Informatics.
    Funktionen av frekvensinnehåll: En studie om frekvensinnehållets betydelse för en spelares uppfattning av spelmiljön2016Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Denna rapport undersöker hur en spelares uppfattning av en spelmiljö påverkas genom bearbetning av ljudbildens frekvensinnehåll. Bakgrunden ger en överblick av fältet ljuddesign för spel med inriktning på definition av lyssnandet och balansering av ljud. Frågeställningen utvärderas genom en praktisk artefakt bestående av ett spel tillsammans med strukturerade intervjuer med syfte att ge en förståelse av varje spelares uppfattning av spelmiljön. Forskningen har fungerat som en metodutvärdering och har även visat på ett samband mellan förändring av ljudbildens frekvensinnehåll och spelarens uppfattning av spelmiljön. Det finns en möjlighet för vidareutveckling av forskningen genom undersökningar av andra spel och ytterligare utforskning av de samband som påträffats.

  • 1595.
    Águila Rodríguez, Guillermo
    et al.
    University of Skövde, School of Engineering Science.
    del Álamo Alcalde, Adrián
    University of Skövde, School of Engineering Science.
    Identification of machine tools´ locations2019Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The scope of this thesis will be focused on the machine FORMA Z1 which is one ofthe most functional amongst the sort of machines currently available in the market. Itprovides faster tool changes besides a huge variety of tool layouts with the possibility ofmaking a product with one only set up. Furthermore, the combi-beam rotation capability,together with dual sets of tools, give to the machine an exceptional competence.Through this project, some of the shortcomings in the usability of the machine are evaluatedto be able to give an accurate solution to provide it of extra functionalities, thusacquiring better efficiency during the performance. This solution consists of the developmentof a device which will aid the operator during the tool arrangement of the machine.The solution includes a platform with a laser that will point out where the operator mustplace the corresponding tool. The system will know where to locate it because the realmachine would generate an XML file which would contain all necessary data. All thisdata will be read by a computer and send it to the microcontroller that will control allthe system.The solution proposed improves the throughput and reduces the time needed in the bendingprocess increasing the facility in the process of bending metal sheet. However, thereare some disadvantages on the implementation of this device. The new machine wouldbe more expensive and the software would be changed to include the new system and theprogram that reads the XML document.

  • 1596.
    Ågren, Lillemor
    University of Skövde, School of Informatics.
    Kognitiva stöd i köksmiljö: för personer med lindrig form av Alzheimers sjukdom2015Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Människor har olika förutsättningar för att hitta i sin köksmiljö beroende på vilket hälsotillstånd som ligger till grund för den enskilde individen. Det finns personer som har ett försämrat arbetsminne på grund av att de fått diagnosen lindrig Alzheimers sjukdom. Idag ger många köksluckor ingen information om innehållet, och i varje enskild individs kök finns det olika objekt beroende på vad som används. Denna studie handlar om att hitta olika former av åtgärder i köksmiljöer för att lättare kunna hitta, det finns en förhoppning av att problemen med att inte hitta kan minska. Att använda datainsamlingstekniker som litteratur, intervjuer, workshop och fokusgrupp ska det gå att få reda på vilka åtgärder som kan fungera. Resultaten visar på att det finns problem, och dessa är tänkt att lösa med olika åtgärdsförslag. De förslag som framkommit som kognitiva stöd är bland annat, öppna planlösningar, individuella bilder och transparanta luckor.

  • 1597.
    Åkerman, Hedwig
    University of Skövde, School of Informatics.
    Dataskyddsförordningen GDPR:S påverkan på befintliga informationssystem: En studie om hur befintliga informationsystem påverkas av GDPR, med fokus på Privacy by Design2018Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This study has examined how the new data protection regulation GDPR affect existing information systems. The study has had a focus on the method Privacy by Design and how well its principles are fulfilled by different companies. In Sweden, the GDPR will replace the personal data act, ‘Personuppgiftslagen’. This change may result in greater challenges for companies since the requirements of GDPR are higher than they were before. The GDPR means a greater protection of privacy and it gives EU citizens more rights regarding how their personal data should be processed. Many of the older, existing information systems weren’t created with regards to what GDPR demands. It is possible that this creates a risk for several existing information systems not being compliant with the regulation, because of difficulties in updating the systems. The GDPR also includes requirements related to Privacy by Design, and it is likely that companies that better meet the Privacy by Design principles are better compliant with the GDPR. From the participating respondents, it was shown that a majority of the seven fundamental principles of Privacy by Design are met. However, an absence of some principles could be seen depending on the organisation or information system. The most challenging aspect of the GDPR according to all respondents was to understand the meaning and intent of the regulation. Regarding what was perceived as the most challenging technical aspect of the GDPR, there were patterns for several requirements from the regulation. The requirements that were considered the essential ones for existing information systems to adapt to, as well as the principles that were better fulfilled were the factors the checklist was based on. The checklist can serve as a tool that provides a direction for how the identified issues can be addressed.

  • 1598.
    Åstrand, Erik
    University of Skövde, School of Informatics.
    Rendering och manipulering av dom: Undersökning av AngularJS och ReactJS2016Independent thesis Basic level (university diploma), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Webben växer och webbapplikationer blir mer och mer komplexa och innehållsrika. Med detta så ska dessa växande applikationer även kunna presenteras på ett tilltalande och effektivt sätt. Jättarna Facebook, Twitter, Instagram och små bloggar har alla börjat använda sig av en teknik för att kunna dynamiskt ladda in ytterligare innehåll på en sida utan att behöva ladda om den. Denna teknik kallas för Infinite Scroll eller oändlig scrollning. Infinite Scroll kan resultera i enormt stort innehåll vilket tidigare studier visar på att det bidrar till bristande prestanda för rendering och manipulering av innehållet. Arbetet kommer utföra ett experiment där målet är att undersöka hur två populära SPA-ramverk AngularJS och ReactJS hanterar detta problem. 

  • 1599.
    Åström, Axel
    University of Skövde, School of Humanities and Informatics.
    REALISTISKT SPELKARAKTÄRSBETEENDE VID ANVÄNDANDET AV HMD2014Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Denna undersökning faller under två olika teoretiska fält, Sommerseth (2007), som använder sig av fenomenologins teorier för att förklara realism inom dataspel, och Freeman m.fl. (2000) som har en psykologisk utgångspunkt. Tillsammans används dessa teorier för att undersöka hur spelare uppfattar animationer i förhållande till Oculus Rift. Denna undersökning genomfördes genom åtta kvalitativa intervjuer, där deltagarna fick testa två olika versioner av ett spel, med olika animationer. Deltagarna filmades för att kunna observeras i efterhand. Data visar att spelare påverkas av tidigare erfarenheter och av spelkaraktärens fackla. Detta påverkade vilka animationer deltagarna uppfattade som realistiska. Data visade också på att Freemans m.fl. teori inte gick att applicera eftersom deltagarens spelvana tog över den kognitiva responsen. Vidare forskning kan göras på Freemans m.fl. metod för att se hur spelvanan hindrades, och även se hur spelare påverkas av ett annat objekt än en fackla.

  • 1600.
    Öberg, Daniel
    University of Skövde, School of Engineering Science.
    Utveckling av ett cykelskåp anpassat för stadsmiljö2019Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The project began as an open question in collaboration with a consulting company in product development to develop a more secure parking for bicycles. Therefore, a comprehensive feasibility study was performed to evaluate the bicycle values and to see potential development opportunities for different types of bicycle parking. Blidsberg mekaniska is a company that manufactures bicycle parking and other types of outdoor environment products. They were involved in the work and wanted to expand their range with a new bike box. The designprocess started with a marketreasearch with the aim to analyze cycle parks in a pre-study. During the pre-study demands was researched and formed a requirement specification. The creative work in the development of a new cycle park was helped by many creative methods that generated many concepts that later was compared in a matrix. The final concept was able to compete with the existing solutions. The result was a combination of already existing solutions. The bicycle locker does not take up more space than is necessary for most bicycles to fit in. The bicycle locker is modularly adapted and can therefore be placed more space efficiently in different places. A light indication on the handle indicates whether the bicycle locker is free or occupied and opened with a tag that is scanned on a RFID-reader.

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