This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Validation of a Model-based Motion Reconstruction Method Developed in the REALMAN Project
ISSN: 0148-7191, e-ISSN: 2688-3627
Published June 14, 2005 by SAE International in United States
Annotation ability available
Realistic motion reconstruction is the first step for ‘human like’ motion simulation by a digital human. In a recent European research project REALMAN (IST 2000-29357), a model-based motion reconstruction method from external marker trajectories was developed. It consists of two steps. The first one is to define a digital twin of a real subject using the technique of superimposing a digital human model upon at least two photos of different view, and identifying marker positions on it. In a second step, joint angles are estimated by using a kinematic model of the human body which is described using natural coordinates: coordinates of points and components of unit vectors for defining the joint locations. The model includes a detailed description of the torso, arms and legs, with simplified hands and feet. A total of 26 joints are used, connecting 27 rigid links, among them 6 located on the spine. The joint angles are calculated by minimizing the distance between markers located on the model and the experimentally measured marker positions, requiring the solution of a nonlinear constrained optimization problem arising from kinematic and driver constraints.
The purpose of this paper is to present a validation study of this motion reconstruction method. Its advantages and limitations will also be discussed.
Validation was made on two types of seated arm reaching movements carried out at INRETS: seat belt reaches and generic reaches. In total, 44 individual digital twins were defined. The comparison with measured anthropometric dimensions has shown that the accuracy of the digital twins depends on static posture used. Good results with an error of less than 30 mm in average were obtained using a standing ‘pharaon’ posture. However, a big difference was observed for the sitting height from the sitting posture. Its average difference reached to 44 mm. Concerning the validation of motion reconstruction, more than 90% of captured motions were successfully reconstructed for both seat belt and generic arm reach movements.
CitationWang, X., Chevalot, N., Monnier, G., Ausejo, S. et al., "Validation of a Model-based Motion Reconstruction Method Developed in the REALMAN Project," SAE Technical Paper 2005-01-2743, 2005, https://doi.org/10.4271/2005-01-2743.
SAE 2005 Transactions Journal of Passenger Cars: Electronic and Electrical Systems
Number: V114-7; Published: 2006-02-01
Number: V114-7; Published: 2006-02-01
- Alexander, E.J. Andriacchi, T.P. 2001 Correcting for deformation in skin-based marker systems Journal of Biomechanics 34 355 361
- Andriacchi, T.P. Alexander, E.J. Toney, M.K. Dyrby, C.O. Sum, J. 1998 A point cluster method for in vivo motion analysis: applied to a study of knee kinematics Journal of Biomechanical Engineering 120 12 743 749
- Apkarian, J. Nauman, S. Cairns, B. 1989 A three-dimensional kinematic and dynamic model of the lower limb Journal of Biomechanics 22 143 155
- Benson, H. Y. Shanno, D. F. Vanderbei, R. J. 2003 A comparative study of large-scale nonlinear optimization algorithms Di Pillo G. Murli A. High Performance Algorithms and Software for Nonlinear Optimization 95 128 Kluwer
- Boggs, P. T. Tolle, J. W. 1995 Sequential quadratic programming Acta Numerica 4 1 51
- Cappello, A. La Palombara, P. F. Leardini, A. 1996 Optimization and smoothing techniques in movement analysis International Journal of Bio-Medical Computing 41 137 151
- Chevalot N. Wang X. 2004 Experimental investigation of the discomfort of arm reaching movements in a seated position SAE International conference and exposition of Digital Human Modeling for Design and Engineering June 15-17 2004 Oakland University Rochester, Michigan, USA SAE paper 2004-01-2141
- Chèze, L. Fregly, B.J. Dimnet, J. 1995 A solidification procedure to facilitate kinematic analyses based on video system data Journal of Biomechanics 28 7 879 884
- García de Jalón, J. Bayo, E. 1994 Kinematics and Dynamic Simulation of Multibody Systems The Real-Time Challenge Springer-Verlag New-York
- García de Jalón, J. Unda, J. Avello, A. 1986 Natural Coordinates for the Computer Analysis of Multibody Systems Computer Methods in Applied Mechanics and Engineering 56 309 327
- Jimenez, J. M. Avello, A. Garcia-Alonso, A. García de Jalón, J. 1990 COMPAMM: A simple and Efficient Code for Kinematic and Dynamic Simulation of 3D Systems with Realistic Graphics Multibody Systems Handbook Schiehlen W. Springer-Verlag 285 304
- Lu, T.-W. O'Connor, J.J. 1999 Bone position estimation from skin marker co-ordinates using global optimization with joint constrains Journal of Biomechanics 32 129 134
- Monnier G. Wang X. Verriest, J.P. Goujon, S. 2003 Simulation of complex and specific task-orientated movements - application to the automotive seat belt reaching SAE International conference and exposition of Digital Human Modeling for Design and Engineering Montreal 17-19 June 2003 SAE paper 2003-01-2225
- Park, W. Chaffin, D.B. Martin, B.J. 2004 Toward memory-based human motion simulation: development and validation of a motion modification algorithm IEEE Transaction on System, Man and Cybernetics - Part A: Systems and Humans 34 3 376 386
- Rebiffé, R. Guillien, J. Pasquet, P. 1982 Enquête anthropométrique sur les conducteurs français Laboratoire de physiologie et biomécanique de l'association Peugeot Renault Rueil-Malmaison
- Seitz, T. Bubb, H. 2001 Human-model based movementcapturing without markers for ergonomic studies Proceedings of the SAE Conference on Digital Human Modelling June 26-28 Washington, DC 2001
- Söderkvist, I. Wedin, P. 1993 Determining the movements of the skeleton using well-configured markers Journal of Biomechanics 26 12 1473 1477
- Velpaus, F.E. Woltring, H.J. Dortmans, L.J.M.G. 1988 A least-squares algorithm for the equiform transformation from spatial marker co-ordinates Journal of Biomechanics 21 356 360