Quantitative biomechanical analysis of transient body behavior during lateral-directional motion of vehicle occupant

In the design of a unified system by human and car seat, comprehensive methodology as the technique including principle and structure of mutual dynamic systems has been required and analyzed. However, these topics have been studied for only vibration measurement. The purpose of this study is to simulate biomechanical body behavior of vehicle occupant in lateral-directional transient acceleration using the carriage, the car seat, motion capture system and mobile force plate. In this paper, the seated body behavior with lateral-directional acceleration is simulated by the experiments and the obtained physical components are quantitatively evaluated by singular value decomposition. As a result of the experiments and data analysis, the effectiveness of the method to analyze biomechanical behavior of vehicle occupant during lateral-directional transient motion on the car seat and its quantitative evaluation concerning principal human motion patterns are validated. Obtained motion patterns may be useful for the efficient automobile design.