Abstract
This paper describes a vibration analysis system for the examination of the vibration transmitted from the road to the human body when riding a bicycle with two infant seats, we designed a vibration model for a bicycle-driver-two infants system and calculated the vertical vibration at transient response. To examine the feasibility of the vibration analysis system, the vertical vibration of the analytical results were compared with one of measurement results. The relationship between the mechanical properties of two infant seats and the transient response of the human body were examined. From these results, the analytical results corresponded with the measurement results in the head and torso of the driver and the infants. It was clarified that the mechanical properties of two infant seats influenced the infants and the lower arm of the driver.
