| Summary: | This paper describes a vibration reduction system that can minimize the vertical vibrations of the human body in a vehicle. This system can control the mechanical properties of the seat cushions and seat back cushions, such as the spring constants and damping coefficients. In previous study, it was estimated a vibration model considering vibrations transmitted from the bottom of the seat and the footrest, and vibration reduction effects of the human body was examined by using this model. However, vibrations of a driver are transmitted from a steering wheel too. Therefore, it is necessary to investigate vibration reduction effects by a model including the upper arm, lower arm and steering wheel. The purpose of this paper is to clarify the vibration reduction effects for the driver by controlling mechanical properties of the seat. In this study,we design a vibration model of an occupant–seat–steering wheel–pedals system and a numerical analysis system, and examine the feasibility of the vibration reduction system based on the vibration model of the occupant–seat–steering wheel–pedals system. Further, a numerical analysis with an optimized algorithm is carried out to calculate the magnitude of vibrations transmitted to the human body. The feasibilities of both the vibration model and numerical analysis system were confirmed by comparing the results between the numerical analysis and the measurement. The vibration reduction system successfully reduced vibrations from the seat to the human body by the analytical results using ISO7096-EM5 and ISO7096-EM6. In addition, the validity of the proposal vibration model of the occupant–seat–steering wheel–pedals system was indicated by comparing the analytical results between the proposal vibration model and the vibration model of occupant–seat system.
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