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  • 1.
    Abdul, Nishan
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Palmborg, Henrik
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Analys och lösningsförslag för logistik inom Volvo Powertrain2020Självständigt arbete på grundnivå (kandidatexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Volvo Powertrain Skövde är en fabrik som tillverkar lastbils- och bussmotorer i olika volymer. Fabriken har flera avdelningar och funktioner som tillsammans uppgör de tre huvuddelarna: gjuteri, bearbetning och montering. En av dessa avdelningar är logistikavdelningen, vars uppgift är att organisera interna logistiska aktiviteter på företaget. Logistikavdelningen eftersträvar att tillgodose god kundservice med låga kostnader och låg miljöpåverkan. Detta arbete rör delar av logistikavdelningens nuvarande datahanteringssystem för lagerhantering. Det nuvarande systemet har bristande användarvänlighet och gör det svårt att överblicka lagerytor. Dessa, och fler problem får logistikavdelningen att uppleva systemet som tidskrävande och bristfälligt. Syftet med detta arbete var att framställa lösningsförslag som åtgärdar bristerna i det nuvarande systemet, utan att kräva större investeringar och underlättar datahanteringen samt ger bättre visualisering över lagerlokalerna. Metoderna som valdes för att uppnå arbetets syfte motiveras från en utförd litteraturstudie.

    För att jämföra lösningsförslag, användes standard IEEE-830 som grund för framtagning av en kravspecifikation. Kravspecifikationen bygger på observationer och intervjuer som utfördes med logistikavdelningen. De lösningsförslag som presenteras bygger på intervjuer med anda sajter inom Volvokoncernen, lösningsförslagen jämförs även mot kravspecifikationen för att se hur väl de passar logistikavdelningens behov. Metoderna som använts under arbetets utförande diskuteras även och avslutningsvis framförs rekommendationer för framtida arbete.

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  • 2.
    Abril, Daniel
    et al.
    IIIA, Institut d'Investigació en Intelligència Artificial – CSIC, Consejo Superior de Investigaciones Científicas, Bellaterra, Spain / UAB, Universitat Autónoma de Barcelona, Bellaterra, Spain.
    Navarro-Arribas, Guillermo
    DEIC, Dep. Enginyeria de la Informació i de les Comunicacions, UAB, Universitat Autònoma de Barcelona, Bellaterra, Spain.
    Torra, Vicenç
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi. IIIA, Institut d'Investigació en Intelligència Artificial – CSIC, Consejo Superior de Investigaciones Científicas, Bellaterra, Spain.
    Spherical Microaggregation: Anonymizing Sparse Vector Spaces2015Ingår i: Computers & security (Print), ISSN 0167-4048, E-ISSN 1872-6208, Vol. 49, s. 28-44Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Unstructured texts are a very popular data type and still widely unexplored in the privacy preserving data mining field. We consider the problem of providing public information about a set of confidential documents. To that end we have developed a method to protect a Vector Space Model (VSM), to make it public even if the documents it represents are private. This method is inspired by microaggregation, a popular protection method from statistical disclosure control, and adapted to work with sparse and high dimensional data sets.

  • 3.
    Abril, Daniel
    et al.
    IIIA, Institut d'Investigació en Intel·ligència Artificial, CSIC, Consejo Superior de Investigaciones Científicas, Campus UAB s/n, Bellaterra, Spain / UAB, Universitat Autònoma de Barcelona, Campus UAB s/n, Bellaterra, Spain.
    Torra, Vicenç
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi. IIIA, Institut d'Investigació en Intel·ligència Artificial, CSIC, Consejo Superior de Investigaciones Científicas, Campus UAB s/n, Bellaterra, Spain.
    Navarro-Arribas, Guillermo
    DEIC, Dep. Enginyeria de la Informació i de les Comunicacions, UAB, Universitat Autònoma de Barcelona, Campus UAB s/n, Bellaterra, Spain.
    Supervised Learning Using a Symmetric Bilinear Form for Record Linkage2015Ingår i: Information Fusion, ISSN 1566-2535, E-ISSN 1872-6305, Vol. 26, s. 144-153Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Record Linkage is used to link records of two different files corresponding to the same individuals. These algorithms are used for database integration. In data privacy, these algorithms are used to evaluate the disclosure risk of a protected data set by linking records that belong to the same individual. The degree of success when linking the original (unprotected data) with the protected data gives an estimation of the disclosure risk.

    In this paper we propose a new parameterized aggregation operator and a supervised learning method for disclosure risk assessment. The parameterized operator is a symmetric bilinear form and the supervised learning method is formalized as an optimization problem. The target of the optimization problem is to find the values of the aggregation parameters that maximize the number of re-identification (or correct links). We evaluate and compare our proposal with other non-parametrized variations of record linkage, such as those using the Mahalanobis distance and the Euclidean distance (one of the most used approaches for this purpose). Additionally, we also compare it with other previously presented parameterized aggregation operators for record linkage such as the weighted mean and the Choquet integral. From these comparisons we show how the proposed aggregation operator is able to overcome or at least achieve similar results than the other parameterized operators. We also study which are the necessary optimization problem conditions to consider the described aggregation functions as metric functions.

  • 4.
    Abril López, Raimundo
    et al.
    Högskolan i Skövde, Institutionen för teknik och samhälle.
    Huertas Molina, Pablo
    Högskolan i Skövde, Institutionen för teknik och samhälle.
    González Zuheros, Rocío
    Högskolan i Skövde, Institutionen för teknik och samhälle.
    STRUCTURAL ANALYSIS OF A WASHING MACHINE THROUGH ITS LOADING CASES: REDESIGN OF THE TRIPOD AND THE FRONT COVER2011Självständigt arbete på grundnivå (kandidatexamen), 15 poäng / 22,5 hpStudentuppsats (Examensarbete)
    Abstract [en]

    This project thesis is developed in collaboration with the mechanical department at University of Skövde, and it is focused in the determination of different loading cases and the application of their results to the optimization of two parts of a washing machine.

     

    The first step in this report is to obtain a numerical model of a washing machine. It includes the assembly in a mechanical software program (Abaqus), and the assignment of the specific boundary conditions and material properties for the problem. Simulation parameters such as mesh size; types of elements, and number of iterations used in the calculations will also be decided.

     

    A study of the different loading cases is carried out with the intention of having a general view of the problem and selecting four specific cases for its application to the reconstruction of the aimed parts (tripod and front cover). This study includes the calculation of the worst relative angle between the tripod and the resultant force for two opposite loads inside the drum. This angle results to be 35º between the arm and the direction of the resultant force.

     

    Through the application of these different loading conditions to this model, the mechanical behaviour of the parts will be obtained and this information will be used in the reconstruction. By mechanical behaviour it is meant to know the maximum level of stress (tension, compression and shear), and deformation (displacement and strain).

     

    Once it is well known which are the most suffering points of the tripod and in the front cover, several different new shapes are created. The parameters considered in this reconstruction were the decrease of volume, the reduction of the level of stress and the deformations. Two of these shapes are chosen and tested in the numerical model, as a checkout.

     

    Finally all these results are presented to the University of Skövde for possible future use.

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  • 5.
    Adamson, Göran
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system. De Montfort University, UK.
    A Novel Method for Adaptive Control of Manufacturing Equipment in Cloud Environments2018Doktorsavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    The ability to adaptively control manufacturing equipment, both in local and distributed environments, is becoming increasingly more important for many manufacturing companies.

    One important reason for this is that manufacturing companies are facing increasing levels of changes, variations and uncertainty, caused by both internal and external factors, which can negatively impact their performance. Frequently changing consumer requirements and market demands usually lead to variations in manufacturing quantities, product design and shorter product life-cycles. Variations in manufacturing capability and functionality, such as equipment breakdowns, missing/worn/broken tools and delays, also contribute to a high level of uncertainty. The result is unpredictable manufacturing system performance, with an increased number of unforeseen events occurring in these systems. Events which are difficult for traditional planning and control systems to satisfactorily manage.

    For manufacturing scenarios such as these, the use of real-time manufacturing information and intelligence is necessary to enable manufacturing activities to be performed according to actual manufacturing conditions and requirements, and not according to a pre-determined process plan. Therefore, there is a need for an event-driven control approach to facilitate adaptive decision-making and dynamic control capabilities.

    Another reason driving the move for adaptive control of manufacturing equipment is the trend of increasing globalization, which forces manufacturing industry to focus on more cost-effective manufacturing systems and collaboration within global supply chains and manufacturing networks. Cloud Manufacturing is evolving as a new manufacturing paradigm to match this trend, enabling the mutually advantageous sharing of resources, knowledge and information between distributed companies and manufacturing units. One of the crucial objectives for Cloud Manufacturing is the coordinated planning, control and execution of discrete manufacturing operations in collaborative and networked environments. Therefore, there is also a need that such an event-driven control approach supports the control of distributed manufacturing equipment.

    The aim of this research study is to define and verify a novel and comprehensive method for adaptive control of manufacturing equipment in cloud environments.

    The presented research follows the Design Science Research methodology. From a review of research literature, problems regarding adaptive manufacturing equipment control have been identified. A control approach, building on a structure of event-driven Manufacturing Feature Function Blocks, supported by an Information Framework, has been formulated. The Function Block structure is constructed to generate real-time control instructions, triggered by events from the manufacturing environment. The Information Framework uses the concept of Ontologies and The Semantic Web to enable description and matching of manufacturing resource capabilities and manufacturing task requests in distributed environments, e.g. within Cloud Manufacturing. The suggested control approach has been designed and instantiated, implemented as prototype systems for both local and distributed manufacturing scenarios, in both real and virtual applications. In these systems, event-driven Assembly Feature Function Blocks for adaptive control of robotic assembly tasks have been used to demonstrate the applicability of the control approach. The utility and performance of these prototype systems have been tested, verified and evaluated for different assembly scenarios.

    The proposed control approach has many promising characteristics for use within both local and distributed environments, such as cloud environments. The biggest advantage compared to traditional control is that the required control is created at run-time according to actual manufacturing conditions.

    The biggest obstacle for being applicable to its full extent is manufacturing equipment controlled by proprietary control systems, with native control languages. To take the full advantage of the IEC Function Block control approach, controllers which can interface, interpret and execute these Function Blocks directly, are necessary.

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  • 6.
    Adamson, Göran
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Holm, Magnus
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Moore, Philip
    Academy of Innovation & Research, Falmouth University, Cornwall, United kingdom.
    Wang, Lihui
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system. KTH Royal Institute of Technology, Stockholm, Sweden.
    A Cloud Service Control Approach for Distributed and Adaptive Equipment Control in Cloud Environments2016Ingår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 41, s. 644-649Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A developing trend within the manufacturing shop-floor domain is the move of manufacturing activities into cloud environments, as scalable, on-demand and pay-per-usage cloud services. This will radically change traditional manufacturing, as borderless, distributed and collaborative manufacturing missions between volatile, best suited groups of partners will impose a multitude of advantages. The evolving Cloud Manufacturing (CM) paradigm will enable this new manufacturing concept, and on-going research has described many of its anticipated core virtues and enabling technologies. However, a major key enabling technology within CM which has not yet been fully addressed is the dynamic and distributed planning, control and execution of scattered and cooperating shop-floor equipment, completing joint manufacturing tasks.

    In this paper, the technological perspective for a cloud service-based control approach is described, and how it could be implemented. Existing manufacturing resources, such as soft, hard and capability resources, can be packaged as cloud services, and combined to create different levels of equipment or manufacturing control, ranging from low-level control of single machines or devices (e.g. Robot Control-as-a-Service), up to the execution of high level multi-process manufacturing tasks (e.g. Manufacturing-as-a-Service). A multi-layer control approach, featuring adaptive decision-making for both global and local environmental conditions, is proposed. This is realized through the use of a network of intelligent and distributable decision modules such as event-driven Function Blocks, enabling run-time manufacturing activities to be performed according to actual manufacturing conditions. The control system’s integration to the CM cloud service management functionality is also described.

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  • 7.
    Adamson, Göran
    et al.
    Högskolan i Skövde, Institutionen för teknik och samhälle. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Holm, Magnus
    Högskolan i Skövde, Institutionen för teknik och samhälle. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Wang, Lihui
    Högskolan i Skövde, Institutionen för teknik och samhälle. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Event-Driven Adaptability using IEC 61499 in Manufacturing Systems2012Ingår i: Proceedings of The 5th International Swedish Production Symposium, SPS12 / [ed] Mats Björkman, Linköping: The Swedish Production Academy , 2012, s. 453-460Konferensbidrag (Refereegranskat)
    Abstract [en]

    Different kinds of uncertainty, such as variations in manufacturing capability and functionality, as well as changes in demand, make up a dynamically changing environment for many manufacturing systems of today. The ability to adapt to these unforeseen changes, through dynamic decision-making as well as dynamic control capabilities based on the use of real-time manufacturing information and intelligence, is vital to be able to perform at a competitive level while reducing unscheduled downtime. The event-driven Function Block (FB) model of the IEC 61499 standard, as opposed to the time-triggered and data-driven concept of IEC 61331, supports this approach, making it possible to handle, in a responsive and adaptive way, different kinds of uncertainty. Our objective is to develop methodologies for distributed, adaptive and dynamic process planning as well as machine monitoring and control for machining and assembly operations, using event-driven FBs. The implementation and testing of FB-based control for manufacturing equipment has been successfully realized in prototype systems, with control of both CNC machining and robotic assembly operations. The approach of using IEC 61499 FBs for adaptive control in other applications is also investigated, as an adaptive decision support system for operators at manufacturing facilities is under development. We strongly believe that IEC 61499 will play a major role in the shift to adaptive manufacturing systems.

  • 8.
    Adamson, Göran
    et al.
    Högskolan i Skövde, Forskningscentrum för Virtuella system. Högskolan i Skövde, Institutionen för teknik och samhälle.
    Holm, Magnus
    Högskolan i Skövde, Forskningscentrum för Virtuella system. Högskolan i Skövde, Institutionen för teknik och samhälle.
    Wang, Lihui
    Högskolan i Skövde, Forskningscentrum för Virtuella system. Högskolan i Skövde, Institutionen för teknik och samhälle.
    Moore, Philip
    University College Falmouth, United Kingdom.
    Adaptive Assembly Feature Based Function Block Control of Robotic Assembly Operations2012Ingår i: The 13th Mechatronics Forum International Conference Proceedings: Vol. 1/3 / [ed] Rudolf Scheidl & Bernhard Jakoby, Linz: TRAUNER Verlag, 2012, s. 8-13Konferensbidrag (Refereegranskat)
    Abstract [en]

    Many manufacturing systems are exposed to a variety of unforeseen changes, negatively restricting their performances. External variations depending on market demand (e.g. changes in design, quantity and product mix) and internal variations in production capability and flexibility (e.g. equipment breakdowns, missing/worn/broken tools, delays and express orders) all contribute to an environment of uncertainty. In these dynamically changing environments, adaptability is a key feature for manufacturing systems to be able to perform at a maximum level, while keeping unscheduled downtime to a minimum. Targeting manufacturing equipment adaptability, this paper reports an assembly feature (AF) based approach for robotic assembly, using IEC 61499 compliant Function Blocks (FBs). Through the use of a network of event-driven FBs, an adaptive controller system for an industrial gantry robot’s assembly operations has been designed, implemented and tested. Basic assembly operations have been mapped as AFs into Assembly Feature Function Blocks (AF-FBs). Through their combination in FB networks, they can be aggregated to perform higher level assembly tasks. The AF-FBs dynamic execution and behavior can be adaptively controlled through embedded eventdriven algorithms, enabling the ability of adaptive decisions to handle unforeseen changes in the runtime environment.

  • 9.
    Adamson, Göran
    et al.
    Högskolan i Skövde, Institutionen för teknik och samhälle. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Wang, Lihui
    Högskolan i Skövde, Institutionen för teknik och samhälle. Högskolan i Skövde, Forskningscentrum för Virtuella system. Department of Production Engineering Royal Institute of Technology 100 44 Stockholm, Sweden.
    Holm, Magnus
    Högskolan i Skövde, Institutionen för teknik och samhälle. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    The state of the art of cloud manufacturing and future trends2013Ingår i: Proceedings of the ASME 2013 International Manufacturing Science and Engineering Conference MSEC2013 June 10-14, 2013, Madison, Wisconsin, USA, ASME - The American Society of Mechanical Engineers , 2013, Vol. 2, s. Article number-, artikel-id MSEC2013-1123Konferensbidrag (Refereegranskat)
    Abstract [en]

    Cloud manufacturing has emerged as a new manufacturing paradigm, which combines technologies (such as Internet of Things, Cloud computing, semantic Web, virtualisation and service-oriented technologies) with advanced manufacturing models, information and communication technologies. It aims to be networked, intelligent, service-oriented, knowledge-based and energy efficient, and promises a variety of benefits and advantages by providing fast, reliable and secure on-demand services for users. It is envisioned that companies in all sectors of manufacturing will be able to package their resources and know-hows in the Cloud, making them conveniently available for others through pay-as-you-go, which is also timely and economically attractive. Resources, e.g. manufacturing software tools, applications, knowledge and fabrication capabilities, will then be made accessible to presumptive consumers on a worldwide basis. After surveying a vast array of available publications, this paper presents an up-to-date literature review together with future trends and research directions in Cloud manufacturing.

  • 10.
    Adamson, Göran
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Wang, Lihui
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system. Royal Institute of Technology, Stockholm, Sweden.
    Holm, Magnus
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Moore, Philip
    Falmouth University, Cornwall, UK.
    Adaptive Robot Control as a Service in Cloud Manufacturing2015Ingår i: ASME 2015 International Manufacturing Science and Engineering Conference: Volume 2: Materials; Biomanufacturing; Properties, Applications and Systems; Sustainable Manufacturing, ASME Press, 2015, Vol. 2, s. Paper No. MSEC2015-9479-Konferensbidrag (Refereegranskat)
    Abstract [en]

    The interest for implementing the concept of Manufacturing-as-a-Service is increasing as concepts for letting the manufacturing shop-floor domain take advantage of the cloud appears. Combining technologies such as Internet of Things, Cloud Computing, Semantic Web, virtualisation and service-oriented technologies with advanced manufacturing models, information and communication technologies, Cloud Manufacturing (CM) is emerging as a new manufacturing paradigm. The ideas of on-demand, scalable and pay-for-usage resource-sharing in this concept will move manufacturing towards distributed and collaborative missions in volatile partnerships. This will require a control approach for distributed planning and execution of cooperating manufacturing activities. Without control based on both global and local environmental conditions, the advantages of CM will not be fulfilled.

    By utilising smart and distributable decision modules such as event-driven FBs, run-time manufacturing operations in a distributed environment may be adjusted to prevailing manufacturing conditions. Packaged in a cloud service for manufacturing equipment control, it will satisfy the control needs in CM. By combining different resource types, such as hard, soft and capability resources, the cloud service Robot Control-as-a-Service can be realised.

    This paper describes the functional perspective and enabling technologies for a control approach for robotic assembly tasks in CM, and describes a scenario for its implementation.

  • 11.
    Adamson, Göran
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Wang, Lihui
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system. Production Engineering, KTH Royal Institute of Technology, Stockholm, Sweden.
    Holm, Magnus
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Moore, Philip
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system. Academy for Innovation & Research, Falmouth University, UK.
    Adaptive Robotic Control in Cloud Environments2014Ingår i: Proceedings of the 24th International Conference on Flexible Automation and Intelligent Manufacturing / [ed] F. Frank Chen, Lancaster, Pennsylvania, USA: DEStech Publications, Inc , 2014, s. 37-44Konferensbidrag (Refereegranskat)
    Abstract [en]

    The increasing globalization is a trend which forces manufacturing industry of today to focus on more cost-effective manufacturing systems and collaboration within global supply chains and manufacturing networks. Cloud Manufacturing (CM) is evolving as a new manufacturing paradigm to match this trend, enabling the mutually advantageous sharing of resources, knowledge and information between distributed companies and manufacturing units. Providing a framework for collaboration within complex and critical tasks, such as manufacturing and design, it increases the companies’ ability to successfully compete on a global marketplace. One of the major, crucial objectives for CM is the coordinated planning, control and execution of discrete manufacturing operations in a collaborative and networked environment. This paper describes the overall concept of adaptive Function Block control of manufacturing equipment in Cloud environments, with the specific focus on robotic assembly operations, and presents Cloud Robotics as “Robot Control-as-a-Service” within CM.

  • 12.
    Adamson, Göran
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Wang, Lihui
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system. Department of Production Engineering, KTH Royal Institute of Technology, Stockholm, Sweden.
    Holm, Magnus
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Moore, Philip
    Academy for Innovation & Research, Falmouth University, Cornwall, United Kingdom.
    Cloud Manufacturing: A Critical Review of Recent Development and Future Trends2017Ingår i: International journal of computer integrated manufacturing (Print), ISSN 0951-192X, E-ISSN 1362-3052, Vol. 30, nr 4-5, s. 347-380Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    There is an on-going paradigm shift in manufacturing, in which modern manufacturing industry is changing towards global manufacturing networks and supply chains. This will lead to the flexible usage of different globally distributed, scalable and sustainable, service-oriented manufacturing systems and resources. Combining recently emerged technologies, such as Internet of Things, Cloud Computing, Semantic Web, service-oriented technologies, virtualisation and advanced high-performance computing technologies, with advanced manufacturing models and information technologies, Cloud Manufacturing is a new manufacturing paradigm built on resource sharing, supporting and driving this change.

    It is envisioned that companies in all sectors of manufacturing will be able to package their resources and know-hows in the Cloud, making them conveniently available for others through pay-as-you-go, which is also timely and economically attractive. Resources, e.g. manufacturing software tools, applications, knowledge and fabrication capabilities and equipment, will then be made accessible to presumptive consumers on a worldwide basis.

    Cloud Manufacturing has been in focus for a great deal of research interest and suggested applications during recent years, by both industrial and academic communities. After surveying a vast array of available publications, this paper presents an up-to-date literature review together with identified outstanding research issues, and future trends and directions within Cloud Manufacturing.

  • 13.
    Adamson, Göran
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Wang, Lihui
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system. Royal Institute of Technology, Stockholm, Sweden.
    Holm, Magnus
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Moore, Philip
    Falmouth University, Cornwall, United Kingdom.
    Feature-Based Adaptive Manufacturing Equipment Control for Cloud Environments2016Ingår i: Proceedings of the ASME 11th International Manufacturing Science and Engineering Conference, 2016, vol 2, American Society of Mechanical Engineers (ASME) , 2016, artikel-id UNSP V002T04A019Konferensbidrag (Refereegranskat)
    Abstract [en]

    The ideas of on-demand, scalable and pay-for-usage resource-sharing in Cloud Manufacturing are steadily attracting more interest. For implementing the concept of Manufacturing as-a-Service in a cloud environment, description models and implementation language for resources and their capabilities are required. A standardized approach for systemived virtualization, servisilisation, retrieval, selection and composition into higher levels of functionality is necessary. For the collaborative sharing and use of networked manufacturing resources there is also a need for a control approach for distributed manufacturing equipment. In this paper, the technological perspective for an adaptive cloud service-based control approach is described, and a supporting information model for its implementation. The control is realized through the use of a network of intelligent and distributable Function Block decision modules, enabling run-time manufacturing activities to be performed according to actual manufacturing conditions. The control system's integration to the cloud service management functionality is described, as well as a feature-level capability model and the use of ontologies and the Semantic Web.

  • 14.
    Adamson, Göran
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Wang, Lihui
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system. Production Engineering KTH Royal Institute of Technology Stockholm, Sweden.
    Holm, Magnus
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Moore, Philip
    Academy for Innovation & Research, Falmouth University, Cornwall, United Kingdom.
    Function Block Approach for Adaptive Robotic Control in Virtual and Real Environments2014Ingår i: Proceedings of the 14th Mechatronics Forum International Conference, Mechatronics 2014 / [ed] Leo J. De Vin; Jorge Solis, Karlstad: Karlstads universitet, 2014, s. 473-479Konferensbidrag (Refereegranskat)
    Abstract [en]

    Many manufacturing companies are facing an increasing amount of changes and uncertainty, caused by both internal and external factors. Frequently changing customer and market demands lead to variations in manufacturing quantities, product design and shorter product life-cycles, and variations in manufacturing capability and functionality contribute to a high level of uncertainty. The result is unpredictable manufacturing system performance, with an increased number of unforeseen events occurring in these systems. Such events are difficult for traditional planning and control systems to satisfactorily manage. For scenarios like these, with a dynamically changing manufacturing environment, adaptive decision making is crucial for successfully performing manufacturing operations. Relying on real-time information of manufacturing processes and operations, and their enabling resources, adaptive decision making can be realized with a control approach combining IEC 61499 event-driven Function Blocks (FBs) with manufacturing features. These FBs are small decision-making modules with embedded algorithms designed to generate the desired equipment control code. When dynamically triggered by event inputs, parameter values in their data inputs are forwarded to the appropriate algorithms, which generate new events and data output as control instructions. The data inputs also include monitored real-time information which allows the dynamic creation of equipment control code adapted to the actual run-time conditions on the shop-floor. Manufacturing features build on the concept that a manufacturing task can be broken down into a sequence of minor basic operations, in this research assembly features (AFs). These features define atomic assembly operations, and by combining and implementing these in the event-driven FB embedded algorithms, automatic code generation is possible. A test case with a virtual robot assembly cell is presented, demonstrating the functionality of the proposed control approach.

  • 15.
    Adamson, Göran
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Wang, Lihui
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system. Department of Production Engineering, Royal Institute of Technology, Stockholm, Sweden.
    Moore, Philip
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Feature-based control and information framework for adaptive and distributed manufacturing in cyber physical systems2017Ingår i: Journal of manufacturing systems, ISSN 0278-6125, E-ISSN 1878-6642, Vol. 43, s. 305-315Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Modern distributed manufacturing within Industry 4.0, supported by Cyber Physical Systems (CPSs), offers many promising capabilities regarding effective and flexible manufacturing, but there remain many challenges which may hinder its exploitation fully. One major issue is how to automatically control manufacturing equipment, e.g. industrial robots and CNC-machines, in an adaptive and effective manner. For collaborative sharing and use of distributed and networked manufacturing resources, a coherent, standardised approach for systemised planning and control at different manufacturing system levels and locations is a paramount prerequisite.

    In this paper, the concept of feature-based manufacturing for adaptive equipment control and resource-task matching in distributed and collaborative CPS manufacturing environments is presented. The concept has a product perspective and builds on the combination of product manufacturing features and event-driven Function Blocks (FB) of the IEC 61499 standard. Distributed control is realised through the use of networked and smart FB decision modules, enabling the performance of collaborative run-time manufacturing activities according to actual manufacturing conditions. A feature-based information framework supporting the matching of manufacturing resources and tasks, as well as the feature-FB control concept, and a demonstration with a cyber-physical robot application, are presented.

  • 16.
    Adamson, Göran
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Wang, Lihui
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system. Department of Production Engineering, Royal Institute of Technology, Stockholm, Sweden.
    Moore, Philip
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Feature-based Function Block Control Framework for Manufacturing Equipment in Cloud Environments2018Ingår i: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 57, nr 12, s. 3954-3974Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The ability to adaptively control manufacturing equipment in cloud environments is becoming increasingly more important. Industry 4.0, supported by Cyber Physical Systems and the concept of on-demand, scalable and pay-for-usage resource-sharing in cloud environments offers many promises regarding effective and flexible manufacturing. For implementing the concept of manufacturing services in a cloud environment, a cloud control approach for the sharing and control of networked manufacturing resources is required. This paper presents a cloud service-based control approach which has a product perspective and builds on the combination of event-driven IEC 61499 Function Blocks and product manufacturing features. Distributed control is realised through the use of a networked control structure of such Function Blocks as decision modules, enabling an adaptive run-time behaviour. The control approach has been developed and implemented as prototype systems for both local and distributed manufacturing scenarios, in both real and virtual applications. An application scenario is presented to demonstrate the applicability of the control approach. In this scenario, Assembly Feature-Function Blocks for adaptive control of robotic assembly tasks have been used.

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    fulltext
  • 17.
    Adattil, Ruksana
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Review on impact of worker’s psychosocial environment under operator 4.0 framework2022Självständigt arbete på avancerad nivå (magisterexamen), 12 poäng / 18 hpStudentuppsats (Examensarbete)
    Abstract [en]

    In manufacturing, emerging digital technologies related to industry 4.0 are playing an assisting role for operators, and just as in previous industrial revolutions the paradigm for operators in the industry is changing. This study has two key goals. The first is to look into the impact of the worker's psychosocial impacts under the operator 4.0 typologies during assembly, training, and maintenance operations, and the second is to look into the potential changes in the operator framework as the industry progresses from 4.0 to 5.0. This study proposed a theoretical framework for assessing psychosocial impacts in operator 4.0 typologies. The proposed framework can be utilized by the company managers, researchers, production engineers, and human resource personnel for the psychosocial risk assessment of the operators in assembly, training, and maintenance operations as self-report questionnaires. This study employed a systematic literature review strategy to answer the study objectives. The findings reveal that the nature of work, the social and organizational environment of work, and individual impacts are all key categories, that might impact operators’ psychosocial environments in assembly, training, and maintenance operations under the operator 4.0 typologies.This study focuses on determining the psychosocial consequences of the operator 4.0 typologies and helps the operators to become more aware, and equipment designers should consider operator psychosocial work conditions when designing new augmented equipment for assisting operators in the work environment. Most advanced technologies are unfamiliar to operators, and they have exhibited a reluctance to accept new technology because it significantly changes their working environment. Which necessitates the training and awareness of operators regarding advanced technologies. Operator 4.0 typologies were introduced with a vision to create a socially sustainable environment for operators. However, the identified psychosocial impacts make it favorable and unfavorable to the operators.

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    fulltext
  • 18.
    Adattil, Ruksana
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Thorvald, Peter
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningsmiljön Virtuell produkt- och produktionsutveckling.
    Romero, David
    Tecnológico de Monterrey, Mexico City, Mexico.
    Assessing the Psychosocial Impacts of Industry 4.0 Technologies Adoption in the Operator 4.0: Literature Review & Theoretical Framework2024Ingår i: International Journal of Industrial Engineering and Management, ISSN 2217-2661, Vol. 15, nr 1, s. 59-80Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    Emerging digital and smart technologies, including wearable and collaborative ones, related to the Industry 4.0 paradigm are playing an assisting, collaborative, and augmenting role for the Operator 4.0, and just as in previous industrial revolutions, the nature of work and the workplace for operators on the shop floor is changing. This literature review aims to look into the impact of digital and smart technologies adoption on the workers’ psychosocial stage under the light of the Operator 4.0 typology. Based on the review conducted, a theoretical framework for assessing the psychosocial impacts (risks) of Industry 4.0 technologies adoption in Operator 4.0 is proposed. The framework can be utilized by company managers, researchers, production engineers, and human resources personnel for carrying out a psychosocial risk assessment of Operator 4.0 in assembly, maintenance, and training operations as these operations get digitally transformed and smartified based on self-report questionnaires. Findings reveal that the nature of work, the social and organizational environment of work, and related individual factors are key categories that might affect the Operator 4.0 psychosocial stage on the shop floor.

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    fulltext
  • 19.
    Adawi, Rahim
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Preventing fatal effects of overworking: Product design solution2018Självständigt arbete på grundnivå (högskoleexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    "Guolaosi" eller död från överarbete är ett fenomen som i regel uppkommer bland utvecklingsländer. Dödsorsaken är huvudsakligen genom stroke. Offrens yrken varierar allt från professorer, IT-arbetare till läkare. De delar dock en sak gemensamt; att arbeta under långa perioder stillasittande. Projektets mål var att utveckla en produkt som minskar dödliga följderna av sedentära överarbete, genom att förebygga en av de tre orsakerna för att utveckla blodproppar; saktad blodström. Målgruppen var då kineser av de yrken som hade tidigare drabbats av fenomenet. För att samla informationsrika data om fenomenet genomfördes en kvalitativ studie i Kina under två månader. Genom att göra en omfattande strukturerad provtagning kunde informationsrika data samlas under en kort tidsperiod. Fältstudien bestod av observationer, frågeformulär och en intervju, som då tolkades till kundbehov och eventuellt produktspecifikationen. Den slutliga produkten kom att bli ett par byxor med en inbyggd dynamisk komprimeringsmekanism, som kan komprimera venerna under sittande aktiviteter, för att förhindra saktad blodström. Kompressionsmekanismen fungerar som den kinesiska fingerfällan. Den komprimerar blodkärlen medan personen sitter och sträcker benen framåt. Produkten är konstruerad på så sätt att den kan tillverkas endast av polysackariders tråd, från bomull och majs. Vilket är lämpligt för Kinas lokala resurser.

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    PREVENTING FATAL EFFECTS OF OVERWORKING – PRODUCT DESIGN SOLUTION / Rahim_Adawi
  • 20.
    Adolfsson, Anton
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Norelius, Mattias
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Reducering av kundreklamationer på ett tillverkande företag med hjälp av lean- och produktionstekniska verktyg2020Självständigt arbete på grundnivå (kandidatexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Kinnarps är ett företag som tillverkar kontorsmöbler samt tillhandahåller arbetsplatslösningar för kontor och offentliga miljöer. Vid avdelningen som examensarbetet utförs på paketeras bordsben manuellt och processen bidrar till ansenliga reklamationskostnader på grund av att fel bordsben paketeras och skickas till kund. Syftet med arbetet är att ta fram förbättringsförslag som reducerar risken för att bordsbensreklamationer uppstår med hjälp av produktionstekniska verktyg och metoder. För att uppnå syftet skulle flera datainsamlingsmetoder genomföras som analys av historiska data, observationer och intervjuer. Efter utförda datainsamlingsmetoder skulle en rotorsaksanalys skapas.Teori som används för att styrka metodvalen i arbetet beskrivs i den teoretiska referensramen. Arbeten inom liknande områden har även studerats i litteraturstudien. Samtliga av de arbetena kan i något avseende relatera till projektet och dess slutsatser.Den empiriska studien utfördes genom att analysera historiska data i form av föregående års reklamationskostnader, observationer enligt gemba samt intervjuer och samtal med personal på avdelningen. Reklamationskostnaderna för det föregående räkenskapsåret var cirka 723 000 SEK. Genom metoderna kunde ett Ishikawa-diagram skapas för att hitta rotorsaken till att problemet uppstår. Med Ishikawa-diagrammet tillsammans med den teoretiska referensramen och litteraturstudien kunde tre förbättringsförslag som reducerar antalet reklamationer presenteras.Samtliga förbättringsförslag har validerats angående verkningsgrad, kostnad och hur stor insats som krävs vid en eventuell implementering. Utifrån valideringen kunde förbättringsförslaget streckkodsläsare presenteras som det mest lämpliga alternativet. Vid en eventuell implementering uppskattas reklamationerna reduceras med 92% vilket motsvarar en besparing på cirka 665 000 SEK om året i form av reducerade reklamationskostnader.

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    fulltext
  • 21.
    Agaeus, Catharina
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Sociala kognitiva arbetsmiljöproblem (SKAMP) inom datorstött samarbete2012Självständigt arbete på grundnivå (kandidatexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Delar av dagens samhälle fortsätter att datoriseras och nya möjligheter för interaktion med datoriserade produkter som stödjer social interaktion introduceras i ökad takt. Själva grunden för hur organisationer ser ut förändras och pekar mot ett allt mer distribuerat sätt där människor kan interagera med varandra utan att vara på samma plats, vid samma tidpunkt. Samtidigt visar forskning att det finns brister i användbarhet hos gruppverktyg. Kognitiva arbetsmiljöproblem (KAMP) kan uppstå när användbarhet brister men har hittills främst studerats ur ett enanvändarperspektiv. Syftet med den här rapporten är att identifiera samt klassificera socio-kognitiva arbetsmiljöproblem (SKAMP) inom datorstött samarbete för att bidra med kunskap som i förlängningen kan leda till en tydligare förståelse kring SKAMP. En arbetsplatsstudie utfördes där distribuerad kognition användes som analysverktyg. Studien genomfördes på en avdelning inom en organisation där förutsättningarna för att finna SKAMP ansågs som gynnsamma. Genom att anta ett distribuerat synsätt där observationer av avbrott och ”mismatches” i informationsflödet beaktats samt hur kognitiva processer implementeras i en grupp mynnade det analyserade materialet ut i fem kategorier av SKAMP: Problem med informationskoordinering, ”Bristande kommunikation”, ”gemensam lägesbildsaknas”, ”Brister i medierad kommunikation”, ”Otillräcklig kontroll och överblick”och ”Oklar holistisk helhetsmodell”. Dessa skall ses som komplement till de redan idag identifierade KAMP.

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  • 22.
    Agea, Andrés
    et al.
    Högskolan i Skövde, Institutionen för teknik och samhälle.
    Millán, Iván
    Högskolan i Skövde, Institutionen för teknik och samhälle.
    Range Extender for the Renault Fluence Z.E.: Choice of the engine and design of the structural support.2012Självständigt arbete på grundnivå (kandidatexamen), 15 poäng / 22,5 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Electric cars have appeared as an alternative to the big pollution caused by internal combustion engine cars. However, electric cars as the Renault Fluence Z.E. are not very sold in the market because of their small range of autonomy. To make this car an attractive option, it is necessary to add a range extender that extends its autonomy. This range extender is based in the addition of a small internal combustion engine to be attached only when the electric autonomy cannot fulfill the trip. A range extender is chosen by means of a comparison between different electric engines sold in the market. By means of a classification tree, the different places of the car where to mount it are compared and the most appropriate is chosen. By using Solidworks, a structure to support the engine and attach it to the car is designed. The result is a Range Extender device to mount in the hitch hook of the Renault Fluence Z.E. that provides an autonomy of around 665 km. This supposes a good solution for the owner of the Renault Fluence Z.E. who needs to cover trips of more than 180 km, the electric autonomy of this car.

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    Range Extender for the Renault Fluence Z.E.
  • 23.
    Agic, Adnan
    et al.
    Department of Engineering Science, University West, Trollhättan, Sweden.
    Eynian, Mahdi
    Department of Engineering Science, University West, Trollhättan, Sweden.
    Hägglund, S.
    Seco Tools, Fagersta, Sweden.
    Ståhl, Jan-Eric
    Lund University, Production and Materials Engineering, Lund, Sweden.
    Beno, Tomas
    Department of Engineering Science, University West, Trollhättan, Sweden.
    Influence of radial depth of cut on dynamics of face milling application2016Ingår i: The 7th International Swedish Production Symposium, SPS16, Conference Proceedings: 25th – 27th of October 2016, Lund: Swedish Production Academy , 2016, s. 1-9Konferensbidrag (Refereegranskat)
    Abstract [en]

    The choice of milling cutter geometry and appropriate cutting data for certain milling application is of vital importance for successful machining results. Unfavourable selection of cutting conditions might give rise to high load impacts that cause severe cutting edge damage. The radial depth of cut in combination with milling cutter geometry might under some circumstances give unfavourable entry conditions in terms of cutting forces and vibration amplitudes. This phenomenon originates from the geometrical features that affect the rise time of the cutting edge engagement into work piece at different radial depths of cut. As the radial depth of cut is often an important parameter, particularly when machining difficult to cut materials, it is important to explore the driving mechanism behind vibrations generation. In this study, acceleration of the work piece is measured for different radial depths of cut and cutting edge geometries. The influence of the radial depth of cut on the dynamical behaviour is evaluated in time and frequency domains. The results for different radial depths of cut and cutting geometries are quantified using root mean square value of acceleration. The outcome of this research study can be used both for the better cutting data recommendations and improved tool design.

  • 24.
    Agic, Adnan
    et al.
    Seco Tools, Fagersta, Sweden ; University West, Department of Engineering Science, Trollhättan, Sweden.
    Eynian, Mahdi
    University West, Department of Engineering Science, Trollhättan, Sweden.
    Hägglund, S.
    Seco Tools, Fagersta, Sweden.
    Ståhl, J.-E.
    Lund University, Production and Materials Engineering, Sweden.
    Beno, Tomas
    University West, Department of Engineering Science, Trollhättan, Sweden.
    Influence of radial depth of cut on entry conditions and dynamics in face milling application2017Ingår i: Journal of Superhard Materials, ISSN 1063-4576, Vol. 39, nr 4, s. 259-270Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The choice of milling cutter geometry and appropriate cutting data for certain milling application is of vital importance for successful machining results. Unfavorable selection of cutting conditions might give rise to high load impacts that cause severe cutting edge damage. Under some circumstances the radial depth of cut in combination with milling cutter geometry might give unfavorable entry conditions in terms of cutting forces and vibration amplitudes. This phenomenon is originated from the geometrical features that affect the rise time of the cutting edge engagement into workpiece at different radial depths of cut. As the radial depth of cut is often an important parameter, particularly when machining difficult-to-cut materials, it is important to explore the driving mechanism behind vibrations generation. In this study, acceleration of the workpiece is measured for different radial depths of cut and cutting edge geometries. The influence of the radial depth of cut on the dynamical behavior is evaluated in time and frequency domains. The results for different radial depths of cut and cutting geometries are quantified using the root mean square value of acceleration. The outcome of this research study can be used both for the better cutting data recommendations and improved tool design.

  • 25.
    Agic, Adnan
    et al.
    Seco Tools, Fagersta, Sweden ; Department of Engineering Science, University West, Trollhättan, Sweden.
    Eynian, Mahdi
    Department of Engineering Science, University West, Trollhättan, Sweden.
    Ståhl, Jan-Erik
    Production and Materials Engineering, Lund University, Sweden.
    Beno, Tomas
    Department of Engineering Science, University West, Trollhättan, Sweden.
    Dynamic effects on cutting forces with highly positive versus highly negative cutting edge geometries2019Ingår i: International Journal on Interactive Design and Manufacturing, ISSN 1955-2513, E-ISSN 1955-2505, Vol. 13, nr 2, s. 557-565Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Understanding the influence of the cutting edge geometry on the development of cutting forces during the milling process is of high importance in order to predict the mechanical loads on the cutting edge as well as the dynamic behavior on the milling tool. The work conducted in this study involves the force development over the entire engagement of a flute in milling, from peak force during the entry phase until the exit phase. The results show a significant difference in the behavior of the cutting process for a highly positive versus a highly negative cutting edge geometry. The negative edge geometry gives rise to larger force magnitudes and very similar developments of the tangential and radial cutting force. The positive cutting edge geometry produces considerably different developments of the tangential and radial cutting force. In case of positive cutting edge geometry, the radial cutting force increases while the uncut chip thickness decreases directly after the entry phase; reaching the peak value after a certain delay. The radial force fluctuation is significantly higher for the positive cutting edge geometry. The understanding of such behavior is important for modelling of the milling process, the design of the cutting edge and the interactive design of digital applications for the selection of the cutting parameters.

    Ladda ner fulltext (pdf)
    FULLTEXT01
  • 26.
    Agic, Adnan
    et al.
    Seco Tools, Fagersta, Sweden ; University West, Department of Engineering Science, Trollhättan, Sweden.
    Eynian, Mahdi
    University West, Department of Engineering Science, Trollhättan, Sweden.
    Ståhl, J.-E.
    Lund University, Production and Materials Engineering, Sweden.
    Beno, Tomas
    University West, Department of Engineering Science, Trollhättan, Sweden.
    Experimental analysis of cutting edge effects on vibrations in end milling2019Ingår i: CIRP - Journal of Manufacturing Science and Technology, ISSN 1755-5817, E-ISSN 1878-0016, Vol. 24, s. 66-74Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The ability to minimize vibrations in milling by the selection of cutting edge geometry and appropriate cutting conditions is an important asset in the optimization of the cutting process. This paper presents a measurement method and a signal processing technique to characterize and quantify the magnitude of the vibrations in an end milling application. Developed methods are then used to investigate the effects of various cutting edge geometries on vibrations in end milling. The experiments are carried out with five cutting edge geometries that are frequently used in machining industry for a wide range of milling applications. The results show that a modest protection chamfer combined with a relatively high rake angle has, for the most of cutting conditions, a reducing effect on vibration magnitudes. Furthermore, dynamics of a highly positive versus a highly negative cutting geometry is explored in time domain and its dependency on cutting conditions is presented. The results give concrete indications about the most optimal cutting edge geometry and cutting conditions in terms of dynamic behavior of the tool.

  • 27.
    Agic, Adnan
    et al.
    Seco Tools AB, Fagersta, Sweden ; Department of Engineering Science, University West, Trollhättan, Sweden.
    Gutnichenko, Oleksandr
    Division of Production and Materials Engineering, Lund University, Sweden.
    Eynian, Mahdi
    Department of Engineering Science, University West, Trollhättan, Sweden.
    Ståhl, Jan-Eric
    Division of Production and Materials Engineering, Lund University, Sweden.
    Influence of cutting edge geometry on force build-up process in intermittent turning2016Ingår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 46, s. 364-367Artikel i tidskrift (Refereegranskat)
    Abstract [en]

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

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    fulltext
  • 28.
    Ahlander, Tommy
    Högskolan i Skövde, Institutionen för teknik och samhälle.
    Oljestopp: Utveckling av ett oljestopp2013Självständigt arbete på grundnivå (kandidatexamen), 15 poäng / 22,5 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Det ekologiska avtrycket på jorden ökar då fler och fler industrier byggs. Till följd av den växande industrialiseringen ställs hårdare krav på att företagen tar tillvara på sina avfall för att minska miljöbelastningen. Arbetet i denna rapport syftar till att utveckla en oljestoppsprototyp åt företaget Furhoffs i Västra Götalands län, vilken har som uppgift att förhindra miljöfarliga lätta vätskor från att rinna ut i avloppen. Arbetet inleds med en marknadsundersökning för att studera andra marknadsaktörers produkter. Efter den inledande marknadsundersökningen samt i samråd med Furhoffs utvecklingsavdelning togs beslut om att prototypen skall ha mekanisk tillslutning. Utifrån underlaget som marknadsundersökning gav utvecklades sju koncept varav två presenterades för Furhoffs efter utvärdering. Den prototyp som i rapporten benämns som koncept 7 valdes för vidareutveckling. Koncept 7 utvecklas sedan för att uppfylla de standarder som gäller för oljestopp. Resultatet från utvecklingsprocessen blev att Furhoffs valde att gå vidare med koncept 7 från konceptnivå till att tillverka en prototyp. I framtiden kommer prototypen utvärderas ytterligare för att sedan eventuellt läggas till i Furhoffs produktsortiment.

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    Oljestopp
  • 29.
    Ahlberg, Mattias
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Informativ Ljuddesign: Hur positivt eller negativt upplevs olika typer av ljud i ett spel utan visuella medel?2018Självständigt arbete på grundnivå (kandidatexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Den här studien fokuserar på hur ljudbilden i ett spel på ett effektivt sätt kan förmedla information till spelaren, och därigenom låta denne ta informerade beslut. För att göra detta undersöks hur olika typer av ljud påverkar en spelares inställning. Bakgrundsforskningen baserades på texter om speltillgänglighet, teorier kring ljuddesign och spel utan visuella medel som utvecklats i studiesyften. För att svara på frågeställningen så utvecklades ett textbaserat program som i tretton rundor lät fem deltagare välja mellan två snarlika ljud. Uppgiften var att välja det ljud som upplevdes som mest positivt, eller minst negativt. Sessionen bestod av en spelsession som kombinerades med en kvalitativ intervju, och hela intervjun spelades in för senare transkribering. I analysen presenterades ett urval av relevanta citat från de kvalitativa intervjuerna som sedan användes för att dra slutsatser utifrån studiens frågeställning. Resultatets tillförlitlighet sänks av det småskaliga urvalet, och personliga associationer kan ha spelat en alltför stor roll i deltagarnas svar.

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    Informativ Ljuddesign
  • 30.
    Ahmed, Adell
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Analys och simulering av produktionsflödet på ett tillverkningsföretag: Simulering kombinerat med Lean-principer2018Självständigt arbete på grundnivå (kandidatexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Konkurrensen mellan tillverkningsföretag ökar ständigt på grund av nya produktionskrav och en efterfrågan på massproducerade varor som är kundanpassade. För att kunna möta kundernas krav måste företagen öka anpassningen av sin produktion utan att förlora kvalitet. Som en följd av en ökad produktion inom verkstaden undersöker nu det uppdragsgivande företaget som deltar i detta projekt, tanken att investera i en automatiserad hydraulisk press för att centralisera processen utanför de olika monteringslinjerna.

    Syftet med examensarbetet är att undersöka om en framtida statorpress kan klara av att försörja fyra monteringslinjer med material. Ett av kraven på det nya upplägget är att årsvolymen ska öka med 50 %.

    Den övergripande arbetsmetod som använts i detta projekt är baserad på Lean-, simulerings- och optimeringsmetoder. För att få en översikt över problemet har en nulägesanalys på det nuvarande flödet gjorts. Därefter gjordes en datainsamling genom dialoger med berörd personal, observationer och studier av historisk data som samlats in. Den insamlade datan användes för att analysera systemet och som input för simuleringsmodellen som skapades över det framtida flödet. För att analysera och förbättra systemet har olika Lean-verktyg använts under projektets gång.

    Företaget presenterade även sina idéer om hur de ville att det tänkta flödet skulle se ut. Dessa har sedan vidareutvecklats och legat till grund för de förbättringsförslag som presenterats. Ett krav var att lösningsförslaget skulle vara Lean-inspirerat.

    Syftet med studien uppnåddes genom att skapa en simuleringsmodell för att testa hur systemet beter sig under olika förhållanden. Det första scenariot som skapades var ett Pull-flöde där produkterna tillverkades endast när det uppstod ett behov. Det andra scenariot var ett Push- system där ingen hänsyn togs till Just-In-Time.

    Resultatet från scenarierna visade en tydlig skillnad mellan de två scenarierna. Pull-flödet visade sig vara mer lämpligt eftersom antalet Produkter I Arbete och ledtiden då minskade drastiskt. Lösningsförslaget med Kanbanmetoden och ett förslag på utformningen av det framtida flödet presenterades även i rapporten.

  • 31.
    Ahmed, Zakarie
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Nasani, Rami
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Modellering och emulering av en människa- robot samarbetande arbetscell2019Självständigt arbete på grundnivå (kandidatexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Kollaborativa robotar är en central utmaning vid industriell utveckling. Problemet idag är att industrirobotar inte är anpassade för ett nära samarbete med människa och säkerhetsgrindar är ett behov. Denna studie fokuserar på att utveckla en emuleringsmodell som kan demonstrera ett sådant samarbete utan behov av säkerhetsgrindar. Projektet bygger på konceptet (virtuell idrifttagning) som handlar om att använda emuleringsverktyg för att utveckla en digital tvilling som är en kopia av ett fysiskt system. Med hjälp av modellen kommer systemets funktioner och programkod testas och valideras innan en verklig implementation utförs. På uppdrag av högskolan i Skövde utfördes examensarbetet för att undersöka möjligheten om ett nära samarbete mellan en människa och industrirobot i en virtuell miljö. I studien har två olika metoder utvecklats för att undersöka möjligheten till ett samarbete men också utveckla en emuleringsmodell. Med detta har operationslistor skapats för att tydliggöra människan respektive roboten arbetsuppgifter. Sedan skapades process scenarier för att demonstrera hur ett sådant samarbete kan ske i en virtuell miljö. En fungerande emuleringsmodell där människa och robot samarbetar, levererades till högskolan i Skövde. Genom att använda emuleringsmodellen kan högskolan skapa och testa olika lösningar innan en implementation av ett verkligt system sker. Slutligen föreslås en emuleringsmetod som kan användas för att utveckla en digital tvilling.  

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    fulltext
  • 32.
    Akrouh Ettaghadouini, Samy
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Metamodelling of a Finite Element Analysis of a Drilling Process with Replaceable Inserts2019Självständigt arbete på avancerad nivå (magisterexamen), 15 poäng / 22,5 hpStudentuppsats (Examensarbete)
    Abstract [en]

    The aim of this project is to create a metamodel from a drilling tool with replaceable inserts from FEA of the machining process using MATLAB and ABAQUS. This report contains research in drilling and in metamodeling using neural networks and the work from the design of the CAD, through FEA and simulations, to the metamodeling, excluding the optimization.

    The work has resulted in a framework where a base FE model of the drill with two inserts that works, but due to time issues and given high cutting speed and feed the results of the FEA and the metamodeling are not very accurate. Therefore, the optimization analysis could not be done. However, it has been shown that feed has a major influence on the inserts temperature than the cutting speed, despite the higher range of this last one.

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    fulltext
  • 33.
    Al Mamun, Abdullah
    et al.
    Division of Software Engineering Chalmers University of Technology and University of Gothenburg, Gothenburg, Sweden.
    Berger, Christian
    Division of Software Engineering Chalmers University of Technology and University of Gothenburg, Gothenburg, Sweden.
    Hansson, Jörgen
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Explicating, Understanding and Managing Technical Debt from Self-Driving Miniature Car Projects2014Ingår i: Proceedings 2014 6th IEEE International Workshop on Managing Technical Debt: MTD 2014, Los Alamitos, CA: IEEE Computer Society, 2014, s. 11-18Konferensbidrag (Refereegranskat)
    Abstract [en]

    Technical debt refers to various weaknesses in the design or implementation of a system resulting from trade-offs during software development usually for a quick release. Accumulating such debt over time without reducing it can seriously hamper the reusability and maintainability of the software. The aim of this study is to understand the state of the technical debt in the development of self-driving miniature cars so that proper actions can be planned to reduce the debt to have more reusable and maintainable software. A case study on a selected feature from two self-driving miniature car development projects is performed to assess the technical debt. Additionally, an interview study is conducted involving the developers to relate the findings of the case study with the possible root causes. The result of the study indicates that "the lack of knowledge" is not the primary reason for the accumulation of technical debt from the selected code smells. The root causes are rather in factors like time pressure followed by issues related to software/hardware integration and incomplete refactoring as well as reuse of legacy, third party, or open source code.

  • 34.
    Alasttal, Reema
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Nizam, Ali
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Karakterisering av kopparytor för att optimera kvaliteten vid lasersvetsning av hairpins2022Självständigt arbete på grundnivå (kandidatexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Utveckling av elmotorer under de senaste åren har lett till stora förändringar inom bilindustrin. Detta medför att industrin ständigt är i behov av utveckling för att kunna anpassa sig till nya metoder och material. Examensarbetet undersöker en del av detta. Lasersvetsning av kopparstänger, kallade hairpins, är en viktig del vid produktion av en elmotor. Vid lasersvetsning av koppar-hairpins uppstår defekter i materialet som resulterar i en dålig svetskvalitet som i sin tur leder till sämre strömflöde i elmotorn. I detta arbete utförs en litteraturundersökning tillsammans med experiment för att bestämma vilka ytbeläggningar samt hur ytgrovheten/ytfinheten påverkar lasersvetsningen av koppar-hairpins. 10 olika prover väljs fram, där förorenade, oxiderade och svartmålande ytor undersöks med slipade och polerade ytor. Resultatet visar att hairpins med en grov yta utan någon ytbeläggning har bäst svetskvalitet, medans hairpins i sin ursprungliga frästa form visar näst bäst svetskvalitet. Slutsatsen är att ytbeläggningar ökar porositeten vilket ger en lägre svetskvalitet. Fler tester behöver utföras för att säkerställa resultatet.

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    fulltext
  • 35.
    Albihn, Hampus
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Steg mot Informationsvisualisering med Augmented Reality2015Självständigt arbete på grundnivå (kandidatexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Som en del av forskningsprojektet Young Operator 2020 så syftar den här studien till att vara ett första steg mot en produkt, som med hjälp av av tekniken augmented reality ska vara en del av framtidens tillverkningsindustri. Studien utgår från kognitionsvetenskap och människa-datorinteraktion för att ha användaren och användarens interaktion med prototypen i fokus. Eftersom olika typer av användare kan behöva olika saker av ett system, kommer den här studien också att utgå från teorier om kompetensnivåer. Ett system som är användbart för exempelvis en novis behöver inte nödvändigtvis vara användbart för en expert. En prototyp har skapats som en del av ett annat projekt och den utgår från det arbetssätt som operatörer på Volvo GTO i Skövde har idag. Prototypen använder sig av augmented reality för att visualisera instruktioner. Det är tänkt att prototypen bland annat ska hjälpa noviser att närma sig expertanvändare. Ett kompetitivt användbarhetstest har gjorts där prototypen jämförts med nuvarande system på Volvo GTO. Resultatet av studien visar att prototypen i dagsläget inte kan anses vara användbar. Flera rekommendationer har dock presenterats som ett bidrag till vidareutveckling av prototypen.

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    stegmotinformationsvisualiseringmedaugmentedreality
  • 36.
    Al-Dabagh, Hussain
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Wahlström, Daniel
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Konstruktion av gripverktyg för en kollaborativ robot2018Självständigt arbete på grundnivå (kandidatexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Detta arbete utförs för att använda en kollaborativ robot i en monteringsprocess med målet att lösa en typ av dold montering, där kugghjul ska synkroniseras. Eftersom delarna är ömtåliga och tunga blir de svåra för montören att hantera, vilket kan leda till skador på material eller ännu värre på montören. Ett gripverktyg ska därför konstrueras för att användas med en kollaborativ robot vid denna typ av montering. En jämförelse av kollaborativa robotar utförs, utifrån två nödvändiga krav,  där robotens lyftförmåga måste vara minst 10 kg och att robotarna säkerhetsmässigt uppfyller säkerhetsstandarder. Där coboten KUKA LBR IIWA 14 visas uppfylla dessa krav och anses vara lämpligast till att utföra arbetsuppgiften. Roboten har en lyftförmåga på 14 kg, vilket betyder att den klarar av gripverktyget och transmissionskåpans massa, roboten anses också vara väldigt enkel att programmera. LBR iiwa är en väldigt mångsidig robot och har inte några stora brister och därför anses valet av robot vara väl genomfört. Ett gripverktyg har konstruerats och gått igenom olika utvecklingsfaser, från att konceptgenerera idéer på designen till att välja material och göra FEM-analyser. Resultat antyder att val av design och material på gripverktyget gör att den är godkänd för tillverkning och kommer att klara av belastningarna gripverktyget kommer att utsättas för vid utförandet av arbetsuppgiften.

    Ladda ner fulltext (pdf)
    fulltext
  • 37.
    Alenljung, Beatrice
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Andreasson, Rebecca
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi. Department of Information Technology, Visual Information & Interaction. Uppsala University, Uppsala, Sweden.
    Billing, Erik A.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Lindblom, Jessica
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Lowe, Robert
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    User Experience of Conveying Emotions by Touch2017Ingår i: Proceedings of the 26th IEEE International Symposium on Robot and Human Interactive Communication (RO-MAN), IEEE, 2017, s. 1240-1247Konferensbidrag (Refereegranskat)
    Abstract [en]

    In the present study, 64 users were asked to convey eight distinct emotion to a humanoid Nao robot via touch, and were then asked to evaluate their experiences of performing that task. Large differences between emotions were revealed. Users perceived conveying of positive/pro-social emotions as significantly easier than negative emotions, with love and disgust as the two extremes. When asked whether they would act differently towards a human, compared to the robot, the users’ replies varied. A content analysis of interviews revealed a generally positive user experience (UX) while interacting with the robot, but users also found the task challenging in several ways. Three major themes with impact on the UX emerged; responsiveness, robustness, and trickiness. The results are discussed in relation to a study of human-human affective tactile interaction, with implications for human-robot interaction (HRI) and design of social and affective robotics in particular. 

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    fulltext
  • 38.
    Alenljung, Beatrice
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningsmiljön Informationsteknologi.
    Andreasson, Rebecca
    Department of Information Technology, Uppsala University.
    Lowe, Robert
    Department of Applied IT, University of Gothenburg.
    Billing, Erik
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningsmiljön Informationsteknologi.
    Lindblom, Jessica
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningsmiljön Informationsteknologi.
    Conveying Emotions by Touch to the Nao Robot: A User Experience Perspective2018Ingår i: Multimodal Technologies and Interaction, ISSN 2414-4088, Vol. 2, nr 4, artikel-id 82Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Social robots are expected gradually to be used by more and more people in a widerrange of settings, domestic as well as professional. As a consequence, the features and qualityrequirements on human–robot interaction will increase, comprising possibilities to communicateemotions, establishing a positive user experience, e.g., using touch. In this paper, the focus is ondepicting how humans, as the users of robots, experience tactile emotional communication with theNao Robot, as well as identifying aspects affecting the experience and touch behavior. A qualitativeinvestigation was conducted as part of a larger experiment. The major findings consist of 15 differentaspects that vary along one or more dimensions and how those influence the four dimensions ofuser experience that are present in the study, as well as the different parts of touch behavior ofconveying emotions.

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    fulltext
  • 39.
    Alenljung, Beatrice
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Lindblom, Jessica
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    User Experience of Socially Interactive Robots: Its Role and Relevance2015Ingår i: Handbook of Research on Synthesizing Human Emotion in Intelligent Systems and Robotics / [ed] Jordi Vallverdú, Hershey, Pennsylvania, USA: IGI Global, 2015, s. 352-364Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    Socially interactive robots are expected to have an increasing importance in everyday life for a growing number of people, but negative user experience (UX) can entail reluctance to use robots. Positive user experience underpins proliferation of socially interactive robots. Therefore, it is essential for robot developers to put serious efforts to attain social robots that the users experience as positive. In current human-robot interaction (HRI) research, user experience is reckoned to be important and is used as an argument for stating that something is positive. However, the notion of user experience is noticeably often taken for granted and is neither described nor problematized. By recognizing the complexity of user experience the intended contributions can be even more valuable. Another trend in HRI research is to focus on user experience evaluation and examination of user experience. The current research paths of user experience of socially interactive robots are not enough. This chapter suggests that additional research directions are needed in order accomplish long-term, wide-spread success of socially interactive robots.

  • 40.
    Alenljung, Beatrice
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Lindblom, Jessica
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Andreasson, Rebecca
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi. Department of Information Technology, Visual Information & Interaction. Uppsala University, Uppsala, Sweden.
    Ziemke, Tom
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi. Department of Computer & Information Science, Linköping University, Linköping, Sweden.
    User Experience in Social Human-Robot Interaction2017Ingår i: International Journal of Ambient Computing and Intelligence (IJACI), ISSN 1941-6237, E-ISSN 1941-6245, Vol. 8, nr 2, s. 12-31Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Socially interactive robots are expected to have an increasing importance in human society. For social robots to provide long-term added value to people’s lives, it is of major importance to stressthe need for positive user experience (UX) of such robots. The human-centered view emphasizes various aspects that emerge in the interaction between humans and robots. However, a positive UX does not appear by itself but has to be designed for and evaluated systematically. In this paper, the focus is on the role and relevance of UX in human-robot interaction (HRI) and four trends concerning the role and relevance of UX related to socially interactive robots are identified, and three challenges related to its evaluation are also presented. It is argued that current research efforts and directions are not sufficient in HRI research, and that future research needs to further address interdisciplinary research in order to achieve long-term success of socially interactive robots.

  • 41.
    Alenljung, Beatrice
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningsmiljön Informationsteknologi.
    Lindblom, Jessica
    Uppsala University, Sweden.
    Zaragoza-Sundqvist, Maximiliano
    AstraZeneca R&D, Mölndal, Sweden.
    Hanna, Atieh
    Volvo AB, Gothenburg, Sweden.
    Towards a Framework of Human-Robot Interaction Strategies from an Operator 5.0 Perspective2023Ingår i: Advances in Manufacturing Technology XXXVI: Proceedings of the 20th International Conference on Manufacturing Research, Incorporating the 37th National Conference on Manufacturing Research,  6th – 8th September 2023, Aberystwyth University, UK / [ed] Andrew Thomas; Lyndon Murphy; Wyn Morris; Vincenzo Dispenza; David Jones, Amsterdam, Netherlands: IOS Press, 2023, s. 81-86Konferensbidrag (Refereegranskat)
    Abstract [en]

    The industrial transition to Industrie 4.0 and subsequently Industrie 5.0 requires robots to be able to share physical and social space with humans in such a way that interaction and coexistence are positively experienced by the humans and where it is possible for the human and the robot to mutually perceive, interpret and act on each other's actions and intentions. To achieve this, strategies for humanrobot interaction are needed that are adapted to operators’ needs and characteristics in an industrial context, i.e., Operator 5.0. This paper presents a research design for the development of a framework for human-robot interaction strategies based on ANEMONE, which is an evaluation framework based on activity theory, the seven stages of action model, and user experience (UX) evaluation methodology. At two companies, ANEMONE is applied in two concrete use cases, collaborative kitting and mobile robot platforms for chemical laboratory assignments. The proposed research approach consists of 1) evaluations of existing demonstrators, 2) development of preliminary strategies that are implemented, 3) re-evaluations and 4) cross-analysis of results to produce an interaction strategy framework. The theoretically and empirically underpinned framework-to-be is expected to, in the long run, contribute to a sustainable work environment for Operator 5.0.

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    fulltext
  • 42.
    Alenljung, Beatrice
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Maurin Söderholm, Hanna
    Högskolan i Borås.
    Designing Simulation-Based Training for Prehospital Emergency Care: Participation from a Participants Perspective2015Ingår i: Human-Computer Interaction: Designing and Evaluation: 17th International Conference, HCI International 2015, Los Angeles, CA, USA, August 2-7, 2015, Proceedings, Part I / [ed] Masaaki Kurosu, Springer Berlin/Heidelberg, 2015, Vol. 9169, s. 297-306Konferensbidrag (Refereegranskat)
    Abstract [en]

    Simulation-based training for prehospital emergency care is characterized by high degrees of complexity. Thorough knowledge of both the work and the setting is crucial and it is therefore important to involve both end-users and other stakeholders during the whole design process. This paper investigates a design process by focusing on how project participants experience the work process and participation of a multi-disciplinary, research-practitioner design team. This case study focuses on the work within a development project of a new prehospital emergency training facility. Open-ended interviews were conducted with the project participants halfway through the project. Strikingly, the results show that while there are problems and tensions that potentially could overturn the project, all participants express strong satisfaction with their participation in the project. This implies that the accumulated positive experiences are so strong that they overshadow tensions and problems that under other circumstances could have caused a project breakdown.

    Ladda ner fulltext (pdf)
    fulltext
  • 43.
    Alenljung, Beatrice
    et al.
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Persson, Anne
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Portraying the practice of decision-making in requirements engineering: a case of large scale bespoke development2008Ingår i: Requirements Engineering, ISSN 0947-3602, E-ISSN 1432-010X, Vol. 13, nr 4, s. 257-279Artikel i tidskrift (Refereegranskat)
    Abstract [en]

     

    Complex decision-making is a prominent aspect of requirements engineering (RE) and the need for improved decision support for RE decision-makers has been identified by a number of authors in the research literature. A first step toward better decision support in requirements engineering is to understand multifaceted decision situations of decision-makers. In this paper, the focus is on RE decision-making in large scale bespoke development. The decision situation of RE decision-makers on a subsystem level has been studied at a systems engineering company and is depicted in this paper. These situations are described in terms of, e.g., RE decision matters, RE decision-making activities, and RE decision processes. Factors that affect RE decision-makers are also identified.

     

  • 44.
    Alfredson, Jens
    et al.
    Saab Aeronautics, Linköping, Sweden.
    Ohlander, Ulrika
    Saab Aeronautics, Linköping, Sweden.
    System Characteristics and Contextual Constraints for Future Fighter Decision Support2016Ingår i: International Journal of Information System Modeling and Design, ISSN 1947-8186, E-ISSN 1947-8194, Vol. 7, nr 1, s. 1-17Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Research on decision support systems for fighter aircraft has to regard future manned and unmanned cooperating aircraft. This paper highlights system characteristics and contextual constraints to guide research as well as system development. Long term trends have been identified for the domain that has to be coped with, including the transformation of the fighter pilot from pilot to tactical decision maker. Automation strategies have to be developed to support manned and unmanned aircraft in a joint cognitive system. For instance, for intelligent fighter pilot support, for distributed unmanned and manned decision making, function allocation has to be concerned. For function allocation it is important not only to regard which agent is best at performing a task but also to regard the risk/cost of performing a task in this kind of potentially hazardous context.

  • 45.
    Alfredsson, Henrik
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Kyngäs, Johanni
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Simuleringsmodell för kontroll av färdigvarulagers storlek2014Självständigt arbete på grundnivå (högskoleexamen), 15 poäng / 22,5 hpStudentuppsats (Examensarbete)
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  • 46.
    Alfredsson, K. Svante
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Biel, Anders
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Salimi, Saeed
    Högskolan i Skövde.
    Shear testing of thick adhesive layers using the ENF-specimen2015Ingår i: International Journal of Adhesion and Adhesives, ISSN 0143-7496, E-ISSN 1879-0127, Vol. 62, s. 130-138Artikel i tidskrift (Refereegranskat)
  • 47.
    Alfredsson, K. Svante
    et al.
    Högskolan i Skövde, Institutionen för teknik och samhälle. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Gawandi, A. A.
    Center for Composite Materials, University of Delaware, Newark, USA.
    Gillespie, J. W., Jr.
    Center for Composite Materials, University of Delaware, Newark, USA.
    Carlsson, L. A.
    Department of Mechanical Engineering, Florida Atlantic University, Boca Raton, USA.
    Bogetti, T. A.
    Army Research Laboratory, Aberdeen Proving Ground, MD, USA.
    Stress analysis of axially and thermally loaded discontinuous tile core sandwich with and without adhesive filled core gaps2011Ingår i: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 93, nr 7, s. 1621-1630Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An analytical study is performed to investigate the stress states in an axially and thermally loaded sandwich structure with a discontinuous ceramic tile core. General and simplified models are developed to determine stresses in the constituents of the sandwich structure with and without adhesive in the gaps between adjacent tiles. A general model that allows local bending of the face sheet and a simplified model which assumes uniform through-thickness stress distribution in the face sheets are developed. It is shown that the normal stress in the face sheet decreases when the gap is filled by adhesive, although the tile stress increases. The analytical model shows that normal and shear stresses at the face/core interface can be reduced by filling the gaps between tiles. Filled gaps also elevate the axial stiffness of the structure. Model results are verified by comparison to a previously developed analytical model and finite element analysis. (C) 2011 Elsevier Ltd. All rights reserved.

  • 48.
    Alfredsson, K. Svante
    et al.
    Högskolan i Skövde, Institutionen för teknik och samhälle. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Gawandi, A. A.
    Center for Composite Materials, University of Delaware, Newark, USA.
    Gillespie Jr., J. W.
    Center for Composite Materials, University of Delaware, Newark, USA.
    Carlsson, L. A.
    Department of Mechanical Engineering, Florida Atlantic University, Boca Raton, USA.
    Bogetti, T. A.
    Army Research Laboratory, Aberdeen Proving Ground, USA.
    Flexural analysis of discontinuous tile core sandwich structure2012Ingår i: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 94, nr 5, s. 1524-1532Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Three-point flexure loading of sandwich beams with a core consisting of discrete ceramic tiles (DTSS) is considered. The tile gaps may be bonded or unbonded (open gaps). The analysis utilizes a layer-wise beam theory approach. The general formulation for the displacements and stresses in the face sheets, face/core adhesive layer, and core is derived. Solutions for stresses and displacements of the beam constituents are obtained from finite element formulation based on analytical solution of the face sheet/tile unit cell. The approach is verified by comparison to stress results obtained from ordinary finite element analysis where each layer is modeled discretely. Effects of load introduction and support conditions on the effective flexural stiffness are examined. It is demonstrated that the face sheets experience substantial stress concentrations at the tile joint locations, especially if the gaps are unfilled. Analysis of beam compliance reveals sensitivity to details of load introduction and support conditions, especially when the span length becomes comparable to the tile length.

  • 49.
    Alfredsson, K. Svante
    et al.
    Högskolan i Skövde, Institutionen för teknik och samhälle. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Stigh, Ulf
    Högskolan i Skövde, Institutionen för teknik och samhälle. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Stability of beam-like fracture mechanics specimens2012Ingår i: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 89, s. 98-113Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Test specimens used to determine the interlaminar strength of composites as well as the strength of adhesive layers are known to occasionally suffer from instability. Thus, even though the experiments are performed under controlled load-point displacement, the experiments are terminated prematurely by unstable crack propagation. Often there exists a critical crack length which must be exceeded in order to obtain stable crack propagation. In this paper, a general method to assess the stability of beam-like fracture mechanics specimens is developed. Both systems subjected to a single load and the more general situation with several independent loads are treated. A simple formula is derived for the critical crack length for one-parameter loading. The only parameter necessary as input is the compliance of the un-cracked specimen. For the case of non-proportional loading, stability is determined by studying the eigenvalues of a symmetric matrix. Other findings quantified in the paper are the effect of orthotropy, the influence of a flexible interphase layer and the influence of the compliance of the loading device.

  • 50.
    Alfredsson, Svante
    Högskolan i Skövde, Institutionen för teknik och samhälle.
    Constitutive Behaviour and Fracture of Adhesive Layers: Inverse Methods and Energetic Balance2004Doktorsavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    In the automobile industry, current demands on reduced emissions with maintained or even increased crash worthiness, forces the industry to seek weight-reducing designs. The possibility to use lightweight materials is obviously attractive. At joints, these lightweight materials have to be connected to high-strength or low-cost materials. In this context adhesive joining can provide a flexible solution. The method adds little weight to the structure, it allows for material combinations that are not possible to weld, and it provides increased stiffness to the structure as compared to the conventional spot-welding procedure. Moreover, electrolytic isolation of the multi-material joints is achieved.

    In this thesis, experimental methods are developed to determine the complete stress-deformation relation for an adhesive layer loaded in shear. Generally, the stress distribution is non-uniform in the test geometries used. Evaluation of experiments is performed using an inverse method. The idea is to measure the energy release rate as a function of the crack tip deformation. The stress-deformation relation is obtained by a subsequent differentiation. The method is shown to be capable of capturing the complete stress-deformation relation under stable loading conditions.

    A method to accurately determine the energy release rate is needed for the inverse method to be successful. A closed form expression for the energy release rate of the end-notch flexure adhesive joint specimen (ENF) is derived in this thesis. An approximate formula containing measurable quantities is also given. It is shown that both the applied load and the crack tip deformation are needed to determine the instantaneous value of the energy release rate of the ENF-specimen. Experimental results show that the influence of the crack tip deformation can be substantial. An alternative specimen is also analysed theoretically.

    An initial theoretical study on mixed mode fracture of adhesive layers is also given in this thesis. A detailed comparison is made of the mode-mixity obtained using two different, frequently used mechanical models; the beam/adhesive layer model, and the continuum model, i.e. a model neglecting the presence of the adhesive layer. It is tempting to assume that the two methods would produce similar results for the case of a thin adhesive layer. However, this is only the case for geometries which are materially and geometrically symmetric with respect to the adhesive layer. For asymmetric joints, on the other hand, the two models are found to predict fundamentally different values of the mode-mixity. Moreover, the mode-mixity of the beam/adhesive layer model is found to depend highly on the relative stiffness of the adherends and the adhesive layer. This dependency is found to be quantified through two parameters.

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