Abstract
In this study, we developed a seated 5-DOF (degree-of-freedom) human model composed of three parts; head, trunk and lower body. The mode shape and undamped natural frequencies were calculated using the derived equations of motion. The spring and damping coefficients of the human model were extracted based on experimental results using the optimization. Also, parametric study of the natural frequencies with respect to the stiffness values of the human model were performed. The veering phenomenon was observed between 4th and 5th modes for variations of the torsional stiffness representing the head-neck joint and the translational stiffness connected between the lower body and the seat floor.
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