A contact model to simulate human–artifact interaction based on force optimization: implementation and application to the analysis of a training machine

Daniel Krüger and Sandro Wartzack

Computer Methods in Biomechanics and Biomedical Engineering, 2017, vol. 20, issue 15, 1589-1598

Abstract: Musculoskeletal multibody models are increasingly used to analyze and optimize physical interactions between humans and technical artifacts. Since interaction is conveyed by contact between the human body and the artifact, a computationally robust modeling approach for frictional contact forces is a crucial aspect. In this contribution, we propose a parametric contact model and formulate an associated force optimization problem to simultaneously estimate unknown muscle and contact forces in an inverse dynamic manner from a prescribed motion trajectory. Unlike existing work, we consider both the static and the kinetic regime of Coulomb’s friction law. The approach is applied to the analysis of a leg extension training machine with the objective to reduce the stress on the tibiofemoral joint. The uncertainty of the simulation results due to a tunable parameter of the contact model is of particular interest.

Date: 2017
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DOI: 10.1080/10255842.2017.1393804

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