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  • 1.
    Keyvani, Ali
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Structuring and use of motion data for computer manikin work task simulations2014Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Modelling and simulation of human motions are of great interest for a number of industrial applications such as ergonomics and production planning. Over time, efforts have been made to provide computerized human models with biomechanically accurate underlying skeleton and realistically rendered volumetric representation of muscles, skin, clothes, etc. known as computer manikins. Despite considerable progress in computational methods for human motion generation in these models, there are still major challenges to generate natural looking motions for daily routine tasks for example in manual assembly lines. This research work proposes a software platform, related methods, and data structures to support use of real motion data for simulating and analysing routine work tasks. One contribution of this thesis is to find ways to deploy motion data in a uniform and efficient manner. The outcomes are a data schema, standards for data conversions, and procedures to aggregate motion data in a unified database. Another part of this thesis is dedicated to 'generating new motions by re-using stored data'. This is done by a synthesizer platform consisting of modules which are able to decompose tasks into primary motions, to search and retrieve motion pieces from the motion database, and to compose a new motion based on the required specifications. In addition, this thesis, presents a method to analyse the generated motions using time-varied motion data. Results of this work contribute in extending current tool functionalities by simulating complicate routine motions which, if not impossible, are very hard to simulate using today's computational algorithms. This work also improves the use of time-varied direct measurement analysis tools against traditional static observational methods.

  • 2.
    Keyvani, Ali
    University West, Department of Engineering Science, Division of Natural Sciences and Electrical and Surveying Engineering. University West, Department of Engineering Science, Research Enviroment Production Technology West.
    Toward motion-capture-based digital human modelling2012Licentiate thesis, comprehensive summary (Other academic)
  • 3.
    Keyvani, Ali
    et al.
    University West, Department of Engineering Science, Division of Production Engineering. University West, Department of Engineering Science, Research Enviroment Production Technology West.
    Danielsson, Fredrik
    University West, Department of Engineering Science, Division of Electrical and Automation Engineering.
    A Virtual Manufacturing Approach for Integrating Fixture Design with Process Planning2009In: Proceedings of the sixth CIRP-sponsored International Conference on Digital Enterprise Technology: 14-16 dec, HongKong, 2009, p. 483-496Conference paper (Other academic)
    Abstract [en]

    Computer Aided Process Planning has received more attention recently due to considerable progress in the aspects of both technology and theory. Beside the traditional trends and efforts to integrate the product design and process planning activities usually referred to as concurrent engineering, virtual manufacturing tools have opened new horizons to this domain. This paper describes how to combine an existing modular fixture design with process planning and simulation tools. The proposed concurrent architecture consists of a functional model and an operational workflow for the design of modular fixtures within the process-planning phase. Two different paradigms, the Variant and the Generative, are discussed in relation to the proposed architecture. Fixtures for Body in White lines are a crucial design problem in the automotive industry. Therefore, the proposed architecture has been tested and investigated in such an environment.

  • 4.
    Keyvani, Ali
    et al.
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Hanson, L.
    Högberg, D.
    Örtengren, Roland
    Chalmers tekniska högskola.
    Lämkull, D.
    Virtal Methods and IT, Volvo Cars, Gothenburg.
    Rhen, I.M.
    Bolmsjö, Gunnar
    University West, Department of Engineering Science, Division of Automation Systems.
    Ergonomic Risk Assessment Using Motion Data Modelling, Exposure Calculation and Comparison with an Epidemiological Reference Database2014In: International Journal of Human Factors Modelling and Simulation, ISSN 742-5549Article in journal (Refereed)
  • 5.
    Keyvani, Ali
    et al.
    University West, Department of Engineering Science, Division of Natural Sciences and Electrical and Surveying Engineering. University West, Department of Engineering Science, Research Enviroment Production Technology West.
    Johansson, Henrik
    University West, Department of Engineering Science, Division of Mechanical Engineering.
    Ericsson, Mikael
    University West, Department of Engineering Science, Division of Natural Sciences and Electrical and Surveying Engineering.
    Motion synthesizer platform for moving manikins2012In: 2012 AHFE International Conference 21-25 July 2012 Hilton San Francisco, Union Square, California: Conference proceedings, AHFE , 2012, p. 545-554Conference paper (Refereed)
  • 6.
    Keyvani, Ali
    et al.
    University West, Department of Engineering Science, Division of Natural Sciences and Electrical and Surveying Engineering. University West, Department of Engineering Science, Research Enviroment Production Technology West.
    Johansson, Henrik
    University West, Department of Engineering Science, Division of Mechanical Engineering.
    Ericsson, Mikael
    University West, Department of Engineering Science, Division of Natural Sciences and Electrical and Surveying Engineering.
    Lämkull, Dan
    Volvo Car Corporation.
    Örtengren, Roland
    Chalmers.
    Schema for Motion Capture Data Management2011In: Lecture Notes in Computer Science. 3rd International Conference on Digital Human Modeling, ICDHM 2011: Orlando, 9-14 July 2011, 2011, p. 99-108Conference paper (Refereed)
    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.

  • 7.
    Keyvani, Ali
    et al.
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Lämkull, D.
    Virtal Methods and IT, Volvo Cars, Gothenburg.
    Bolmsjö, Gunnar
    University West, Department of Engineering Science, Division of Automation Systems.
    Örtengren, Roland
    Chalmers tekniska högskola.
    Extending Functionalities of DHM Tools Using Motion Databases2014In: International Journal of Industrial Ergonomics, ISSN 0169-8141, E-ISSN 1872-8219Article in journal (Refereed)
  • 8.
    Keyvani, Ali
    et al.
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering.
    Lämkull, D.
    Virtal Methods and IT, Volvo Cars, Gothenburg.
    Bolmsjö, Gunnar
    University West, Department of Engineering Science, Division of Automation Systems.
    Örtengren, Roland
    Chalmers tekniska högskola.
    Functionalities of DHM Tools Using Motion Databases2014In: International Journal of Industrial Ergonomics, ISSN 0169-8141, E-ISSN 1872-8219Article in journal (Refereed)
  • 9.
    Keyvani, Ali
    et al.
    University West, Department of Engineering Science, Division of Natural Sciences and Electrical and Surveying Engineering. University West, Department of Engineering Science, Research Enviroment Production Technology West.
    Lämkull, Dan
    Volvo Car Corporation, Gothenburg.
    Bolmsjö, Gunnar
    University West, Department of Engineering Science, Division of Production Engineering.
    Örtengren, Roland
    Chalmers University.
    Using methods-time measurement to connect digital humans and motion databases2013In: Lecture Notes in Computer Science, ISSN 0302-9743, E-ISSN 1611-3349, Vol. 8026, no Part 2, p. 343-352Article in journal (Refereed)
    Abstract [en]

    To simulate human motions in DHM tools, using techniques which are based on real human data is one promising solution. We have presented a solution in this study to connect motion databases with DHM tools. We have showed that using a motion database with MTM-based annotations is a promising way in order to synthesize natural looking motions. A platform consists of a Motion Database, a Motion Generator, and a DHM tool was introduced and tested. The results showed successful application of the presented platform in the designed test case. © 2013 Springer-Verlag.

  • 10.
    Keyvani, Ali
    et al.
    University West, Department of Engineering Science, Divison of Natural Sciences, Surveying and Mechanical Engineering. Chalmers University of Technology.
    Paul, G.
    School of Public Health and Social Work, Queensland University of Technology, Brisbane.
    Lämkull, D.
    Virtal Methods and IT, Volvo Cars, Gothenburg.
    Bolmsjö, Gunnar
    University West, Department of Engineering Science, Division of Automation Systems.
    Örtengren, Roland
    Chalmers tekniska högskola.
    Standardization of Motion Databases for DHM Applications: Challenges, Issues and considerations2014In: Article in journal (Refereed)
1 - 10 of 10
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