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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.

THIS PAPER presents a in-house computer code which can be used properly in the conceptual design period. For the mathematical modeling of a suspension, D'Alembert's variational equations of motion for a system of rigid bodies are formulated. The comparison of the results from this code and ADAMS are compared and the typical supension characteristics are shown for a benchwork case.

This paper presents the results of development of a special purpose program VEDYNAS for vehicle dynamic analysis and its application to design modification of a vehicle under development. The special purpose program for vehicle dynamic analysis is devised to reduce the computation time near to the minimum by using the relative coordinate system to reduce the number of generalized coordinates of a system to the minimum. Validity and efficiciency of the program for analysis of a vehicle model is demonstrated through comparisons with analysis results using a commercial S/W DADS and driving test results of a real vehicle. The program is applied efficiently to comparative driving performance analysis of a vehicle under development with a current production vehicle.