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  • 1. Batungwanayo, Guillaume
    et al.
    Runnemalm, Anna
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för automationssystem.
    Ericsson, Mikael
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för elektro- och automationsteknik.
    Weld Joint Tracking System in an Automatic Inspection Cell by Using Emissivity Variation2014Ingår i: Proceedings of the 6th International Swedish Production Symposium 2014 / [ed] Stahre, Johan, Johansson, Björn & Björkman, Mats, 2014, s. 1-7Konferensbidrag (Refereegranskat)
    Abstract [en]

    Thermography has proven to be a suitable nondestructive testing method for automatic crack inspection of welds. However automatic weld inspection raises challenges. E.g. the position of the weld might not be exactly as the predefined weld seam, and a weld joint tracking system is needed. To reduce the number of equipment used, a solution is presented in this papers. The infrared camera in the thermography system is a carrier of information of the weld path. This is used for the weld joint tracking system. It is shown that the weld joint tracker is fast enough for an on-line automatic inspection.

  • 2.
    Danielsson, Fredrik
    et al.
    Högskolan Väst, Institutionen för teknik (HTU).
    Ericsson, Mikael
    Högskolan Väst, Institutionen för teknik (HTU).
    Computer Aided Robotics combined with a Finite Element Analysis for Process Simulation of Welding2004Ingår i: 35th International Symposium on Robotics, ISR 2004: Paris, mars 2004, Paris: International Federation of Robotics , 2004Konferensbidrag (Refereegranskat)
  • 3.
    Ericsson, Mikael
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap.
    Simulation fo Robot Paths and Heat Effects in Welding2006Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
  • 4.
    Ericsson, Mikael
    Högskolan Väst, Institutionen för teknik (HTU).
    Simulation of robotic TIG-welding2003Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
  • 5.
    Ericsson, Mikael
    et al.
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap. Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för maskinteknik.
    Berglund, D.
    Nylén, Per
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap. Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för maskinteknik.
    Three Dimensional Simulation of Robot path, Heat Transfer and Residual Stresses of a TIG-welded Part with Complex Geometry2002Ingår i: Trends in Welding Research: Proceedings of the 6th International Conference: Phoenix, AZ, 15-19 April, 2002, 2002, s. 973-978Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    In this paper a system is presented that combines a robot off-line programming software with a finite element model that predicts temperature-time histories and residual stress distributions. The objective is to develop a tool for the engineer where robot trajectories and welding process parameters can be optimized on parts with complex geometry. The system was evaluated on a stainless steel gas turbine component. Robot weld paths were defined off-line and automatically downloaded to the finite element program, where transient temperatures and residual stresses were predicted. Temperature dependent properties and phase change, were included in the analysis. Assumptions and principles behind the modeling techniques are presented together with predicted temperature histories, residual stresses, and fixture forces.

  • 6.
    Ericsson, Mikael
    et al.
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för maskinteknik.
    Bolmsjö, Gunnar
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för automationssystem.
    Nylén, Per
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Forskningsmiljön produktionsteknik(PTW).
    Three-dimensional simulation of robot path and heat transfer of a TIG-welded part with complex geometry2002Ingår i: 11th International Conferences on Computer Technology in Welding: Colombus, Ohio December 6-7, 2001, 2002, s. 309-316Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    The application of commercial software (OLP) packages for robot simulation, and programming, use interactive computer graphics, provide powerful tools for creating welding paths off-line. By the use of such software, problems of robot reach, accessibility, collision and timing can be eliminated during the planning stage. This paper describes how such software can be integrated with a numerical model that predicts temperature-time histories in the solid material. The objective of this integration is to develop a tool for the engineer where robot trajectories and process parameters can be optimized on parts with complex geometry. Such a tool would decrease the number of weld trials, increase productivity and reduce costs. Assumptions and principles behind the modeling techniques are presented together with experimental evaluation of the correlation between modeled and measured temperatures.

  • 7.
    Ericsson, Mikael
    et al.
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap.
    Henriksson, P.
    Non-contact Temperature Measurements using an Infrared Camera in Aerospace Welding Applications2002Ingår i: 6th International Conference on Trends in Welding Research: Phoenix, AZ; 15-19 April 2002, Materials Park: ASM International , 2002, s. 930-935Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper describes the application of infrared (IR) thermal imaging and temperature measurements in welding applications, both on single plane plates and on an aero engine turbine component with complex geometry. Temperature profiles were measured on the plates using thermocouples (T/C) in combination with an IR camera system, and the results were compared. The IR camera was used both in line scan mode (270 Hz scan frequency) and in full frame mode (1 Hz frame rate). Different methods of surface treatments have been tested to handle the problem of the surface emissivity variations due to oxidation during welding. Results from measurements using thermocouples and IR camera is presented in the paper as well as temperature measurements using the IR camera on an turbine exhaust case (TEC) engine component.

  • 8.
    Ericsson, Mikael
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för elektro- och automationsteknik.
    Holmblad, Lars
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för elektro- och automationsteknik.
    Almhage, Lisa
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för elektro- och automationsteknik.
    Brochmann, Johanne
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för elektro- och automationsteknik.
    Co-op-modellen – ökad motivation, genomströmning och anställningsbarhet hos studenterna2011Ingår i: 3:e UTVECKLINGSKONFERENSEN FÖR SVERIGES INGENJÖRSUTBILDNINGAR 30 NOVEMBER – 1 DECEMBER 2011 PÅ TEKNISKA HÖGSKOLAN VID LINKÖPINGS UNIVERSITET / [ed] Svante Gunnarsson, Linköping: Linköpings Universitet , 2011, s. 90-93Konferensbidrag (Refereegranskat)
    Abstract [sv]

    Den här artikeln beskriver ett mycket framgångsrikt utbildningskoncept som genomförs på Högskolan Väst, främst på ingenjörsutbildningarna maskin och elkraft, som ger en ökad samverkan mellan högskola och omkringliggande samhälle. Konceptet bygger på en amerikansk modell som heter ”Cooperative Education” (Co-op). I Co-oputbildningen varvas teoriperioder med betalda arbetsperioder ute på olika företag och organisationer. Genom en väl planerad integration mellan teoriperioderna och arbetsperioderna förlängs utbildningen i genomsnitt med ca 6 månader men studenten har efter erlagd examen ca 1 års arbetslivserfarenhet. För att sköta kontakterna med de olika företagen finns Co-opkoordinatorer anställda på högskolan. Dessa har till uppgift att sköter den grundläggande kontakten med respektive företag. Studenterna anställs av företagen via ett normalt anställningsförfarande och de har lön enligt företagets kollektivavtal. Företagens organisation och arbetssätt integreras naturligt i utbildningen genom Co-opmodellen då studenten deltar i företagets verksamhet. Detta ger studenten en direkt inblick i arbetslivets villkor och en för Co-opmodellen karaktäristisk självgående förmåga hos studenterna utvecklas.

    Under arbetsperioden besöks studenten och företaget av Co-opkoordinatorn. Under detta besök diskuteras bl.a. arbetsinnehåll, utbildning och framtida kunskapsbehov i företaget. Företagens önskemål fångas upp och integreras på ett bra sätt i utbildningen. Exempel på bra samverkan är gästlärare från företagen. Gästlärare har funnits med sen starten av högskolans ingenjörsutbildningar 1990 och andelen kurser med en eller flera gästföreläsare har ökat genom åren. Den främsta samarbetspartnern på elkraftprogrammet är Vattenfall, men också Preemraff och Trollhättan Energi finns representerade.

    Konkreta resultat av utbildningskonceptet är att studenterna blir mer studiemotiverade vilket ger en ökad genomströmning av godkända studenter på programmen jämfört med studenter som inte följer Co-opmodellen. Ett annat resultat är att Co-opstudenterna har en mycket högre anställningsbarhet jämfört med en vanlig student som har läst samma utbildning.

  • 9.
    Ericsson, Mikael
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).
    Johansson, Dahniel
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för produktionssystem (PS).
    Stjern, David
    AI-Based Quality Control of Wood Surfaces with Autonomous Material Handling2021Ingår i: Applied Sciences, E-ISSN 2076-3417, Vol. 11, nr 21, s. 9965-9965Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The theory and applications of Smart Factories and Industry 4.0 are increasing the entry into the industry. It is common in industry to start converting exclusive parts, of their production, into this new paradigm rather than converting whole production lines all at once. In Europe and Sweden, recent political decisions are taken to reach the target of greenhouse gas emission reduction. One possible solution is to replace concrete in buildings with Cross Laminated Timber. In the last years, equipment and software that have been custom made for a certain task, are now cheaper and can be adapted to fit more processes than earlier possible. This in combination, with lessons learned from the automotive industry, makes it possible to take the necessary steps and start redesigning and building tomorrows automated and flexible production systems in the wood industry. This paper presents a proof of concept of an automated inspection system, for wood surfaces, where concepts found in Industry 4.0, such as industrial Internet of things (IIoT), smart factory, flexible automation, artificial intelligence (AI), and cyber physical systems, are utilized. The inspection system encompasses, among other things, of the shelf software and hardware, open source software, and standardized, modular, and mobile process modules. The design of the system is conducted with future expansion in mind, where new parts and functions can be added as well as removed.

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  • 10.
    Ericsson, Mikael
    et al.
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap.
    Nylén, Per
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap.
    A look at the optimization of robot welding speed based on process modelling2007Ingår i: Welding Journal, ISSN 0043-2296, Vol. 86, nr 8, s. 238-244Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Simulation tools to search for optimal process parameters are of great interest to reduce the number of experiments and thereby reduce cost and production time. In this paper, robot simulation has been used in combination with finite element simulations to optimize robot speed in order to minimize distortion while keeping complete joint penetration. In an earlier work performed by the authors, a finite element model was developed to predict heat transfer and residual stresses of parts with complex shapes. An interface between a robot simulation model and a finite element analysis model was also constructed. In this paper, an iterative method for robot speed optimization has been developed using MATLAB. The algorithm is designed to maintain complete joint penetration while maximizing productivity by utilizing the fastest weld speed. The method makes it possible to optimize the heat input to the component and thereby minimize component deformation for parts with complex shapes. The system was evaluated on stainless steel plates with varying thicknesses. Robot weld paths were defined off line and automatically downloaded to the finite element software where the optimization was performed. Simulations and experimental validations are presented.

  • 11.
    Ericsson, Mikael
    et al.
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap.
    Nylén, Per
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap.
    Berglund, D.
    Ling-Peng, R.
    Three dimensional simulation of robot path, heat transfer and residual stresses of a welded part with complex geometry2005Ingår i: International jourrnal for the joining of materials, ISSN 0905-6866, Vol. 17, nr 2, s. 42-51Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this article a simulation system is presented that combines computer aided robotics software used to define the welding operation, with a finite element model that predicts temperature-time histories and residual stress distributions for welding applications. The objective is to develop a tool for engineering processes in which robot trajectories and welding process parameters can be optimized off-line on parts with complex geometries. The system was evaluated on a stainless steel gas turbine component. Temperature dependent properties and phase change were included in the analysis. The turbine component was welded using an in-house TIG welding cell. The assumptions and principles that underpin the modeling techniques are presented together with predicted temperature histories, residual stresses, and fixture forces. Predicted residual stresses were compared with neutron diffraction measurements.

  • 12.
    Ericsson, Mikael
    et al.
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap.
    Nylén, Per
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap.
    Danielsson, Fredrik
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap.
    Carlsson, Henrik
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap.
    Off-line programming of robots for metal deposition2005Ingår i: Trends in welding research: Proceedings of the 7th international conference, May 16-20. Pine Mountain, Georgia, 2005, s. 629-634Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Metal Deposition (MD) is a rapid prototyping technique to build parts by depositing metal in a required fashion. When a complex-shaped part is to be built, a simulation tool is needed to define robot trajectories. Three different simulation-based methods for robot trajectory generation are introduced and compared in this study. The methods are; reversed milling, adapted rapid prototyping and application programming in a computer aided robotics software. All methods were shown capable of creating robot paths for complex shapes, with the CAR software approach being the most flexible. Using this method, the geometry to be built is automatically sliced into layers and a robot path is automatically generated. The method was tentatively evaluated and appears to provide a powerful technique in the design and optimisation of robot paths for MD. Experiments showed that it is possible to manufacture fully dense parts using an Nd-Yag laser.

     

  • 13.
    Ericsson, Mikael
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för automationssystem.
    Ryberg, Anders
    Nilsson, Jim
    Christiansson, Anna-Karin
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för automation och datateknik.
    Lennartson, Bengt
    Chalmers.
    Off-Line Simulation of Advanced Stereo Vision Welding Applications2010Ingår i: Machine Vision and Applications, ISSN 0932-8092, E-ISSN 1432-1769Artikel i tidskrift (Refereegranskat)
  • 14.
    Ericsson, Mikael
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).
    Zhang, Xiaoxiao
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för produktionssystem (PS).
    Christiansson, Anna-Karin
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för produktionssystem (PS).
    Virtual Commissioning of Machine Vision Applications in Aero Engine Manufacturing2018Ingår i: Proceedings of The 15th International Conference on Control,Automation, Robotics and Vision, November 18-21, 2018, 2018, s. 1947-1952, artikel-id 0293Konferensbidrag (Refereegranskat)
    Abstract [en]

    New aero engine design puts new demands on the manufacturing methods with increased automation level. Therefore, the use of vision sensors for control and guiding of industrial robots is being increasingly used. In such system, it is need to customise the machine vision system with real components in the real environment which is normally done close to the start-up of the production. This paper addresses a new concept for designing, programming, analysing, testing and verifying a machine vision application early in the design phase, called Virtual Machine Vision. It is based on a robot simulation software where the real machine vision application is simulated before the implementation in the production line. To verify the Virtual Machine Vision concept an advanced stereo vision application was used. Using two captured images from the robot simulated environment, camera calibration, image analysis and stereo vision algorithms are applied to determine a desired welding joint. The information of the weld joint, i.e. robot position and orientation for the weld path, are sent from the machine vision system to the robot control system in the simulation environment and the weld path is updated. The validation of the Virtual Machine Vision concept using the stereo vision application is promising for industrial use, and it is emphasised that the same programs are used in the virtual and real word.

  • 15.
    Eriksson, Kristina M.
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för produktionssystem (PS).
    Chirumalla, Koteshwar
    Ericsson, Mikael
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).
    Håkansson, Lars
    Götborgs universitet, Göteborg (SWE).
    A novel blended learning course developed jointly between three universities to address competence development of professionals in digitalized manufacturing2019Ingår i: VILÄR 5-6 december 2019, University West, Trollhättan: Abstracts / [ed] Kristina Johansson, Trollhättan: University West , 2019, s. 6-7Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    New competences and knowledge needs arises as manufacturing industry evolves and becomes increasingly digitalized. Facing this transformation, one of the challenges is the continuous and growing need for novel initiatives for competence development.The case portrayed here stems from a Swedish cross-university project aiming to jointly develop and offer courses for competence development of professionals in the manufacturing and IT sectors. The ambition is to increase the impact of the universities' respective efforts of meeting industry competence needs, where the continuous digital transformation entails that employees must develop or even change their qualifications.

    The case outlined focus co-production of a joint course package, at master level, between three universities and their respective company networks. Participating universities have long traditions in working closely with companies in research and education, where approaches for co-production have evolved over time. We make use of our joint understanding of the manufacturing industry's specific competence needs and our experiences of sustainable course formats for participants working full time.The joint course covers aspects of a manufacturing company on three levels: plant level i.e. material and production flows, cell level e.g. robotic simulation and visualisation, and system level i.e. data acquisition and monitoring through sensors. Each university is developing a course module of 2.5 ECTS, addressing a level respectively of their specialist competence. Participants are to complete assignments for each course module, i.e. for all three manufacturing levels, where the previous assignment provides an input to the next level, enabling the participants to encompass a holistic view of a manufacturing system. Participants need to combine study and work and at the same time they wish to extend their network, hence we are adopting a blended learning approach, where virtual labs and web conferences are mixed with physical meetings.A variety of challenges arise when designing such novel approaches: combining company networks, course design including online learning, planning of physical course meetings,

    joint promotion, common admission and validation process, financial models and more. However, engaging in partnerships with industry for knowledge transformation and development has the potential to become rewarding for all parties.

  • 16.
    Eriksson, Kristina M.
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för produktionssystem (PS).
    Chirumalla, Koteshwar
    Mälardalens högskola, Akademin för innovation, design och teknik, Innovation och produktrealisering, (SWE).
    Ericsson, Mikael
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).
    Håkansson, Lars
    Linnéuniversitetet, Växjö, (SWE).
    Developing a professional course on digitalized production for Swedish manufacturing industry: An inter-university collaboration, its challenges, and opportunities2020Konferensbidrag (Refereegranskat)
  • 17.
    Eriksson, Kristina M.
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för produktionssystem (PS).
    Chirumalla, Koteshwar
    Mälardalen University, Eskilstuna, (SWE).
    Myrelid, Paulina
    Mälardalen University, Eskilstuna, (SWE).
    Ericsson, Mikael
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för produktionssystem (PS).
    Granlund, Anna
    Mälardalen University, Eskilstuna, (SWE).
    Håkansson, Lars
    Linnaeus University, Växjö, (SWE).
    Johansson, Dahniel
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för produktionssystem (PS).
    Experiences in Running a Professional Course on Digitally-Enabled Production in Collaboration Between Three Swedish Universities2022Ingår i: Advances in Transdisciplinary Engineering, ISSN 2352-751X, Vol. 21, s. 653-664Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Abstract. Needs for new competences and knowledge arise as industry 4.0 evolves

    in increasingly digitalized production. This development entails that job

    transformations and future skills need attention from the perspective of industry 5.0,

    where human and machine find ways of working together to improve production

    performance. Facing this perspective, one challenge is a growing need for novel

    lifelong learning initiatives, to meet emerging and altering occupations for the

    fulfilment of future skill requirements. This challenge is addressed here by

    portraying a case where three Swedish universities have formed a distinctive

    collaboration to develop a flexible (i.e. blended) course for professionals, in the

    subject of Digitally-enabled production. The purpose is to develop a sustainable

    collaboration between the universities and create a course format on master level

    addressing lifelong learning for the increasingly digitalized production. The

    ambition is to increase the impact of the universities respective efforts by sharing

    resources and utilizing individual specialized expertise to develop a practical and

    relevant course that can reach a larger target group. The course encompasses

    industry 4.0 readiness on three levels of production systems; plant-, production cell-,

    and component level; to adopt a holistic view of digitalization in production. We

    followed an action research approach for continuously collecting and documenting

    our experiences during the course development, implementation, and dissemination

    of the course. Within the frame of action research, an explorative case study

    describes and analyzes the initiative. The results highlight challenges and

    opportunities for succeeding with this form of co-produced course. The joint course

    gives professionals possibilities to work on cases from their own companies with

    expert supervision from three manufacturing levels to address complex challenges

    in industry 4.0 implementation. To conclude, the importance of lifelong learning in

    relation to the human-centric approach of industry 5.0 is emphasized as a future

    direction.

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  • 18.
    Keyvani, Ali
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för elektro, lantmäteri och naturvetenskap. Högskolan Väst, Institutionen för ingenjörsvetenskap, Forskningsmiljön produktionsteknik(PTW).
    Johansson, Henrik
    Ericsson, Mikael
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för elektro, lantmäteri och naturvetenskap.
    Motion synthesizer platform for moving manikins2012Ingår i: 2012 AHFE International Conference 21-25 July 2012 Hilton San Francisco, Union Square, California: Conference proceedings, AHFE , 2012, s. 545-554Konferensbidrag (Refereegranskat)
  • 19.
    Keyvani, Ali
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för elektro, lantmäteri och naturvetenskap. Högskolan Väst, Institutionen för ingenjörsvetenskap, Forskningsmiljön produktionsteknik(PTW).
    Johansson, Henrik
    Ericsson, Mikael
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för elektro, lantmäteri och naturvetenskap.
    Lämkull, Dan
    Volvo Car Corporation.
    Örtengren, Roland
    Chalmers.
    Schema for Motion Capture Data Management2011Ingår i: Lecture Notes in Computer Science. 3rd International Conference on Digital Human Modeling, ICDHM 2011: Orlando, 9-14 July 2011, 2011, s. 99-108Konferensbidrag (Refereegranskat)
    Abstract [en]

    A unified database platform capable of storing both motion captured data and information about these motions (metadata) is described. The platform stores large motion captured data in order to be used by different applications for searching, comparing, analyzing and updating existing motions. The platform is intended to be used to choose a realistic motion in simulation of production lines. It is capable of supporting and handling different motion formats, various skeleton types and distinctive body regions in a uniform data model. Extended annotating system is also introduced to mark the captured data not only in the time domain (temporal) but also on different body regions (spatial). To utilize the platform, sample tests are performed to prove the functionality. Several motion captured data is uploaded to the database while MATLAB is used to access the data, ergonomically analyze the motions based on OWAS standard, and add the results to the database by automatic tagging of the postures.

  • 20.
    Muniz, Jorge
    et al.
    Sao Paulo State University, UNESP (BRA).
    Eriksson, Kristina M.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för produktionssystem (PS).
    Valemtim, Marta Ligia Pomim
    UNESP (BRA).
    Ramasamy, Sudha
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för produktionssystem (PS).
    Shotaro, Yagi
    University of Tokyo, Tokyo (JPN).
    Marins, Fernando A.S.
    UNESP (BRA).
    Voorwald, Herman J.C.
    UNESP (BRA).
    Ericsson, Mikael
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för produktionssystem (PS).
    Zhang, Yufeng
    University of Birmingham, Birmingham (GBR).
    Challenges of Engineering Education 5.0 based on I4.0 Policies in Brazil, India, Japan, and Sweden2022Ingår i: International Conference on Work Integrated Learning: Abstract Book, Trollhättan: University West , 2022, s. 95-96Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Introduction: Industry and academia have placed increasing attention on implementing Industry 4.0 (I4.0) in the production ofgoods and services. Named as Industry 4.0 in Brazil, Made in India in India, Society 5.0 in Japan, andProduktion2030 in Sweden (Ribeiro et al., 2022). Hereafter, we apply I4.0 to simplify, which promises customizedproducts produced in smaller lots, and that repetitive manufacturing tasks can be automated very soon (Karre etal., 2017).Country policies play an important role in pushing different sectors of the economy, aligned as new with theregulatory framework of national and international trade, especially industrial (Aguinis et al., 2020). The implementation of I4.0 literature indicates different specificities in each country, including culture, R&D targets,education and vocational training, and their research opportunities related to how I4.0 affects workers (Jerman etal., 2020). The research-question is: How do different countries approach the opportunities and challenges of Engineering Education 4.0 through similar or different country policies?This study aims to discuss engineering education related to I4.0 policies. This discussion is based on policies fromBrazil, India, Japan, and Sweden related to education and workers 5.0, which include students and employees.Investigating how these countries are adjusting to I4.0 is relevant for national industrial sectors to wish to actefficiently in this new technological context. Industry 4.0 demands new professional skills and will impactemployment. It is noteworthy that this research is in line with the Sustainable Development Goals (SDGs) proposedby the United Nations (UN): Quality Education (SDG-4); o Decent Work and Economic Growth (SDG-8); andIndustry, Innovation, and Infrastructure (ODS-9) which seeks to promote inclusive and sustainableindustrialization and foster innovation. This research aims to contribute to sustainable o rganizational practices;formulation of public policies that alleviate social problems; guidance of professional curricula affected by I 4.0.

    Papers and Data Selection: A literature search was conducted in the Scopus database, which gathers some of the most important journalsrelated to manufacturing technologies with high impact factors, based on the PRISMA method, which refers to aminimum set of evidence-based items to report studies in systematic reviews and meta -analyses (MOHER et al.,2009). The paper set was assembled from the Scopus core collection, using the following search string: “industry4.0” OR “industry 5.0” AND “policies” AND ". The results were narrowed to texts in English, which yielded 1496papers. All titles and abstracts were read, which resulted in a set composed of 14 papers. We also use official documents relating to I4.0 raised from official government websites.

    Comparison of Countries’ Education policies and Industry 4.0: The literature addresses difficulties associated with the implementation of I4.0 in emerging economies (Dalagnore,2018; Hong and Muniz Jr., 2022). Not surprisingly, current literature I4.0 related to technology adoption is themost prevalent theme discussed from a hard, technology-oriented perspective rather than a people-oriented.Production systems are sociotechnical systems, with an explicit understanding that all systems involve ongoinginteractions between people and technology, and they are rapidly transforming virtually all areas of human life,work, and interaction.The European Commission’s (Breque et al., 2021) vision for ‘Industry 5.0’ proposes moves past a narrow andtraditional focus on technology-or economic enabled growth of the existing extractive, production andconsumption driven economic model to a more transformative view of growth that is focused on human progressand well-being based on reducing and shifting consumption to new forms of sustainable, circular and regenerativeeconomic value creation and equitable prosperity. This Human-centric production system design and managementapproach (Industry 5.0) is necessary to support skill development, learning, continuous improvement andcollaboration in the organization (Ribeiro et al., 2022).

    Conclusion: Brazil, India, Japan and Sweden create policies to support their own technological independence. All countriesindicate concern about education and development of skills related to I4.0.It can be concluded that the four countries studied from the perspective of Industry 4.0 an d Engineering Education4.0 are all embarking on their journeys towards increased digitalization in industry and society as a whole. Therealization of the human-centered Society 5.0 was realized and highlighted comparatively early for Japan, whereasin the Europe Union and thus in Sweden the focus of the importance of Industry 5.0 development in parallelIndustry 4.0 has risen up since year 2021.The results indicate that although there are many initiatives of meeting the needs for new competence andknowledge in the era of I4.0 to accommodate Engineering Education 4.0 there are still challenges for futureresearch to move forward in the nexus between I4.0 and I5.0. The result, of studying different countries'policies, highlights that it is imperative, when approaching novel technologies in I4.0 and designing Engineering Education 4.0, to in parallel consider technological implementations with the inclusion of I5.0 aspects and humancentric perspectives.

  • 21.
    Ramanathan, Prabhu K.
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för produktionssystem (PS).
    Ericsson, Mikael
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för produktionssystem (PS).
    Development of an Intelligent Robotized Machine Vision Automated System for Bacterial Growth Monitoring2023Ingår i: Proceedings of 2023 International Conference on Signal Processing, Computation, Electronics, Power and Telecommunication, IEEE, 2023, s. 1-6Konferensbidrag (Refereegranskat)
    Abstract [en]

    Pathogenic bacterial growth detection and monitoring is an important scientific process in the field of quality control in the food, water, and medical industries. Very-large-scale process of such bacteria growth monitoring is possible only with an automated process. The mechanism must make sure that the sample is continuously monitored, and detected, data is communicated to supervisors and managers, and data is stored historically retrievable for quality control and analysis. A manual bacteria inspection among the Petri dishes incubated of such bacterial growth in food processing was attempted for automation. The manual inspection in a microbiological industry involves; an operator inspecting the input petri discs to check if there are bacteria, writing down the barcode of the corresponding petri dish, and then sorting the Petri discs depending on the bacterial growth. In this automation attempt of automatizing this petri-disc inspection, the project was split into two phases. 1. Building a vision system to detect bacteria, developing of an algorithm to quantify the growth, and registering the barcode in a registry. 2. The second phase is to design a robot system with programming and define the layout of the station. The development of an intelligent robotized machine vision automated system proves the concept of a major industrial practice that has the potential to significantly increase the quality and productivity of bacterial growth, with increased throughput.

  • 22.
    Runnemalm, Anna
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för automationssystem.
    Liu, Tongwein
    Ericsson, Mikael
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för automation och datateknik.
    Appelgren, Anders
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för automation och datateknik.
    Influence of Vibration Induced Disturbances in an Automatic Inspection Cell2013Ingår i: Robotics in Smart Manufacturing / [ed] Pedro Neto,António Paulo Moreira, 2013, s. 191-202Konferensbidrag (Refereegranskat)
    Abstract [en]

    In the modern manufacturing industry, quality assurance is important. Over the last few years, the interest in automatic inspection has increased and automatic non-destructive testing (NDT) has been introduced. A general automated inspection cell consists of a mechanized system for scanning and a computer system for automatic analysis of the data. In the manufacturing industry, it is preferable to use industrial robots as the scanning equipment since they offer great flexibility, excellent support organization and the in-house know-how is normally high. Another benefit is that a robot can carry different inspection equipment and an inspection cell can therefore include more than one NDT method. For an automatic analysis, high quality of the resulting data is essential. However, a non-stable condition of the NDT sensor mounted on the robotic arm may influence the results. This paper focuses on the influence of the vibration induced disturbances on the results from an NDT system. Vibration amplitude of a point to point robot movement on the robotic arm is measured. The influence of vibration disturbances on the inspection results are evaluated on the thermal images from a thermography system mounted on a six axis industrial robot. The thermal images taken by the system during the movement and after the stop of the robot are evaluated, and the influence of the vibration in these two situations is considered.

  • 23.
    Ryberg, Anders
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Ericsson, Mikael
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Christiansson, Anna-Karin
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för industriell produktion.
    Eriksson, Kenneth
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för lantmäteriteknik och matematik.
    Nilsson, Jim
    Högskolan Väst, Institutionen för ingenjörsvetenskap.
    Larsson, Matthias
    Högskolan Väst, Institutionen för ingenjörsvetenskap.
    Stereo vision for path correction in off-line programmed robot welding2010Ingår i: Proceedings of the IEEE International Conference on Industrial Technology, 2010, s. 1700-1705Konferensbidrag (Refereegranskat)
    Abstract [en]

    The paper describes a versatile machine vision system for correcting off-line programmed nominal robot trajectories for advanced welding. Weld trajectory corrections are needed due to slight variations in weld joints. Such variations occur naturally because of varying tolerances in parts and to heat induced deformations during earlier weld sequences. The developed system uses one camera and a weld tool mounted on the robot hand. As a first step, the whole system, including the camera, is calibrated. Then the system takes images of the weld joint from different positions and orientations, and determines the weld joint geometry in 3D using a stereo vision algorithm and a novel camera model. The weld trajectory is then updated in the robot control system, and weld operation is performed. These steps are repeated for all weld sequences of the work piece. The strategy has successfully been demonstrated for a standard industrial welding robot and a standard FireWire CMOS camera. The maximum deviation of the trajectory found by the system compared to a reference (coordinate measuring machine) is 0.7 mm and the mean deviation is 0.23 mm. Thus, the system shows high potential for industrial implementation. ©2010 IEEE.

  • 24.
    Ryberg, Anders
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap.
    Lennartson, Bengt
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för produktionssystem (PS).
    Christiansson, Anna-Karin
    Högskolan Väst, Institutionen för ingenjörsvetenskap.
    Asplund, Lars
    Mälardalen University.
    Ericsson, Mikael
    Högskolan Väst, Institutionen för ingenjörsvetenskap.
    Analysis and evaluation of a general camera model2011Ingår i: Computer Vision and Image Understanding, ISSN 1077-3142, E-ISSN 1090-235X, Vol. 115, nr 11, s. 1503-1515Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A versatile General Camera Model, GCM, has been developed, and is described in detail. The model is general in the sense that it can capture both fisheye and conventional as well as catadioptric cameras in a unified framework. The camera model includes efficient handling of non-central cameras as well as compensations for decentring distortion. A novel way of analysing radial distortion functions of camera models leads to a straightforward improvement of conventional models with respect to generality, accuracy and simplicity. Different camera models are experimentally compared for two cameras with conventional and fisheye lenses, and the results show that the overall performance is favourable for the GCM.

  • 25.
    Sikström, Fredrik
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för elektro- och automationsteknik.
    Ericsson, Mikael
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för elektro- och automationsteknik.
    Integration of finite element analysis and computer aided robotics for advanced programming of robotized welding2009Ingår i: ASM Proceedings of the International Conference: Trends in Welding Research / [ed] S.A. David, T. DebRoy, J.N. DuPont, T. Koseki, and H.B. Smartt, ASM International, 2009, s. 454-460Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper describes a promising approach where finite element analysis is combined with computer aided robotics in off-line programming of advanced robotized welding. Finite element analysis is used to find an optimized weld power signal based on weld trajectories obtained from computer aided robotic simulations. The weld power signal is calculated by applying feedback control in the finite element simulation. This optimization ensures a full penetration weld while the total specific thermal energy input is minimized in order to mitigate unwanted residual stress and distortion. The objective with this approach is to support the design of robotized welding and significantly reduce the number of costly trials in physical implementations. The relevance of this paper is a useful method for off-line optimization of robot trajectories and varying process parameters.

  • 26.
    Sikström, Fredrik
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för elektro- och automationsteknik.
    Ericsson, Mikael
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för elektro- och automationsteknik.
    Christiansson, Anna-Karin
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för elektro- och automationsteknik.
    Niklasson, Kjell
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för process- och produktutveckling.
    Tools for simulation based fixture design to reduce deformation in advanced fusion welding2008Ingår i: Intelligent Robotics and ApplicationsLecture Notes in Computer Science Volume 5315,  2008: First International Conference, ICIRA 2008 Wuhan, China, October 15-17, 2008 Proceedings, Part II / [ed] Youlun Xioun, Springer, 2008, Vol. 5315 LNAI, nr PART 2, s. 398-407Konferensbidrag (Refereegranskat)
    Abstract [en]

    The traditional fusion welding and fixture simulations are performed using advanced finite element simulation tools, commonly used are e.g. MSC.Marc, ANSYS, ABACUS and COMSOL Multiphysics. These simulations are made one at a time and separately due to heavy calculation load for each case. Such an approach does not give a full description of the integrated work piece and fixture behaviour. We propose a strategy to decrease the computational time and solve the problem accurately enough for industrial needs. Focus of the simulation result is on residual deformation. The work piece is a simplified component composed by metal sheets, and rigid and loose clamping was investigated. Simulation results give the size of forces and deformations in the clamped edge. Deformation measurements are performed using 3D-scanning of the work piece after cooling and released from fixture, same situation as in the FE-simulations. The proposed strategy has shown to be useful and is industrially competitive due to reduced engineering manpower, computation time, and need for practical experiments. The strategy is to use full off-line programming where computer aided robotics for weld sequencies is integrated with finite element modelling in order to obtain weld parameters and fixture design.

  • 27.
    Sikström, Fredrik
    et al.
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för elektro- och lantmäteri.
    Ericsson, Mikael
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för elektro- och lantmäteri.
    Nylén, Per
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för maskinteknik.
    Christiansson, Anna-Karin
    Högskolan Väst, Institutionen för ingenjörsvetenskap.
    3D-Scanning for Weld Distortion Measuring2006Ingår i: Instrumentation and Measurement Technology Conference, 2006. IMTC 2006. Proceedings of the IEEE, IEEE conference proceedings, 2006, s. 2132-2137Konferensbidrag (Refereegranskat)
    Abstract [en]

    Optical three dimensional scanning for weld distortion measurements have been performed for validation, inspection, general visualization and documentation of a robotized welding process. The planning, preparing and processing of the weld is done in a simulation-based concept where computer aided robotics software simulations are integrated with finite element analysis simulations with the objective to reduce global geometrical deformation during welding. The off-line programmed robot paths were used as an input for finite element calculations of temperature fields and distortion in the work piece. In order to validate the finite element model 3D-scannings have been performed before and after every single welding sequence. This paper describes a validation experiment with non-contact measurements of weld distortion and discusses limitations in optical 3D-scanning techniques used for this purpose

  • 28.
    Wärmefjord, Kristina
    et al.
    Chalmers University of Technology, Dept. of Product and Production Development, SE-412 96 Gothenburg, Sweden.
    Söderberg, Rikard
    Chalmers University of Technology, Dept. of Product and Production Development, SE-412 96 Gothenburg, Sweden.
    Ericsson, Mikael
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT).
    Appelgren, Anders
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för produktionssystem (PS).
    Lundbäck, Andreas
    Luleå University of Technology, Dept. of Engineering Sciences and Mathematics, SE-971 87 Luleå, Sweden.
    Lööf, Johan
    GKN Aerospace,Engine Systems, SE-461 81 Trollhättan, Sweden .
    Lindkvist, Lars
    Chalmers University of Technology, Dept. of Product and Production Development, SE-412 96 Gothenburg, Sweden.
    Svensson, Hans-Olof
    GKN Aerospace,Engine Systems, SE-461 81 Trollhättan, Sweden .
    Welding of non-nominal geometries: physical tests2016Ingår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 43, s. 136-141Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The geometrical quality of a welded assembly is to some extent depending part positions before welding. Here, a design of experiment is set up in order to investigate this relation using physical tests in a controlled environment. Based on the experimental results it can be concluded that the influence of part position before welding is significant for geometrical deviation after welding. Furthermore, a working procedure for a completely virtual geometry assurance process for welded assemblies is outlined. In this process, part variations, assembly fixture variations and welding induced variations are important inputs when predicting the capability of the final assembly.

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