移動車両のシート振動が乗員に及ぼすストレス影響

抄録

In this study, to achieve a human-adaptive noise and vibration design in a vehicle cabin based on the sensory characteristics of the passengers, the psychological stress of the occupant by the vibration of the seat are studied. First, the measurement of the vibrational acceleration and its modal analysis of the seat and its occupant were performed. Results showed that the seat vibrated in the direction in which the seat and back rest overlapped due to the vibration of the frequency consistent with the second order vibration of the engine. Further, it was found that the occupant's head vibrated in the front and rear direction in opposite phases with respect to the neck and torso due to the vibration of the second order vibration of the engine. It was also revealed that the left and right sides of the thigh vibrated in opposite phases, and the left and right sides of the knee vibrated in the same phase in the vertical direction. Next, the brain waves of the occupant were measured when the vehicle was an idle state. Results showed that there was a clear difference of the intensity of the alpha-wave in the idle state, which proved to be useful for judging the stressed and relaxed state of the occupant.