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Several dynamic models of a seated human body on a seat base(cushion) without backrest were presented in the literature, which were estimated based on measurements of apparent mass of the body. Important results in previous studies on dynamic modeling of seated human bodies without backrest were that 1) a parallel three degree of freedom model is adequate and 2) stiffness of the model gets softened with increase of excitation level. In this study, most appropriate model among candidates is selected for describing a seated human body leaning on backrest, and the similar characteristics as well as some more results, such as the characteristic variations of damping and stiffness of the selected model with varying input level will be discussed.

For the stress and durability analysis of vehicle components with computer simulation, it is necessary to find forces acting on the vehicle components due to the road profile undulation. In this study, road profiles are regenerated by preserving the same PSD of wheel responses. The frequency response function between road and wheel, the digital signal processing method, and DADS program are used. Simulation results of load transfer at suspension components using this virtual road profiles are presented.

In this paper, stresses at the suspension components are calculated using the joint reaction forces obtained from computer simulation. The Shear Force Diagram, Bending Moment Diagram, and the stress distribution of the damper strut are also calculated. The AutoDyn7 program is used for the computer simulation, which is a vehicle dynamics program developed in G7 project.