Issue No. 05 - May (2014 vol. 20)
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/TVCG.2013.252
Charles Pontonnier , Ecoles Militaires de Saint-Cyr Coëtquidan/IRISA/INRIA, Campus Universitaire de Beaulieu, Rennes Cedex, France
Afshin Samani , Laboratory for Ergonomics and Work-related Disorders, Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, AalborgUniversity, 9220 Aalborg East, Denmark
Marwan Badawi , INRIA/IRISA Rennes, Campus Universitaire de Beaulieu, Rennes Cedex 35042, France
Pascal Madeleine , Laboratory for Ergonomics and Work-related Disorders, Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, AalborgUniversity, 9220 Aalborg East, Denmark
Georges Dumont , ENS Rennes IRISA/INRIA, Campus Universitaire de Beaulieu, Rennes Cedex 35042, France
Nowadays the process of workstation design tends to include assessment steps in a virtual environment (VE) to evaluate the ergonomic features. These approaches are cost-effective and convenient since working directly on the digital mock-up in a VE is preferable to constructing a real physical mock-up in a real environment (RE). This study aimed at understanding the ability of a VR-based assembly tasks simulator to evaluate physical risk factors in ergonomics. Sixteen subjects performed simplified assembly tasks in RE and VE. Motion of the upper body and five muscle electromyographic activities were recorded to compute normalized and averaged objective indicators of discomfort, that is, rapid upper limb assessment score, averaged muscle activations, and total task time. Rated perceived exertion (RPE) and a questionnaire were used as subjective indicators of discomfort. The timing regime and complexity of the assembly tasks were investigated as within-subject factors. The results revealed significant differences between measured indicators in RE and VE. While objective measures indicated lower activity and exposure in VE, the subjects experienced more discomfort than in RE. Fairly good correlation levels were found between RE and VE for six of the objective indicators. This study clearly demonstrates that ergonomic studies of assembly tasks using VR are still challenging. Indeed, objective and subjective measurements of discomfort that are usually used in ergonomics to minimize the risks of work-related musculoskeletal disorders development exhibit opposite trends in RE and VE. Nevertheless, the high level of correlation found during this study indicates that the VR-based simulator can be used for such assessments.
Ergonomics, Assembly, Muscles, Complexity theory, Electromyography, Haptic interfaces
C. Pontonnier, A. Samani, M. Badawi, P. Madeleine and G. Dumont, "Assessing the Ability of a VR-Based Assembly Task Simulation to Evaluate PhysicalRisk Factors," in IEEE Transactions on Visualization & Computer Graphics, vol. 20, no. 5, pp. 664-674, 2014.