Abstract
This study deals with dynamic models of a human body and a bicycle during off-road cycling for optimization of the vibration characteristics of bicycle frame. A stability of a bicycle and a ride comfort depend on the characteristics of human-bicycle system. In addition, the mass ratio of a human body to a bicycle is extremely large as compared with other vehicles. Therefore, rider's posture becomes very important. In the present paper, the modal frequency and damping ratio of first mode of human body in vertical direction when the bicycle goes over an obstacle are estimated by experimental modal analysis. Especially, influence of condition of arms is clarified.
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