Abstract
The purposes of this study are to create a mathematical model which can simulate vehicle occupant dynamic interaction, and to perform a parametric study of influences on human vertical and lateral behavior. With a cross-sectional model, vehicle-occupant movements are simulated by numerical calculations. The mathematical model has nine degrees of freedom : the vehicle model with three masses has four degrees of freedom, the occupant model with three masses and the hinged beam model has five degrees of freedom. These motions are considered with respect to the vertical, lateral and roll axes. A fairly good agreement is obtained between the results of mathematical simulation and the other data. Therefore, it can be concluded that the mathematical model is valid for practical purposes. With use of this simulation system, the effects of seat characteristics of occupants on human dynamic behavior are investigated. As a result, it is found that seat characteristics exert a significant influence upon both vertical and lateral vibration.
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