Abstract
Recently, the riding comfort of car passengers became as important as the driving performance and the control stability. In order to improve the riding comfort, it is necessary to evaluate comfort quantitatively and take increasing comfort measures. In this study we analyzed the effect of vibration on the riding comfort. First, we conducted vibration experiment using ordinary sine waves with two different directions, X (fore and aft)-Z (vertical) and Y (lateral)-Z (vertical) in order to investigate vibratory sensibility in the high frequency range, 4.0-8.0Hz. The parameter of the input vibration was amplitude ratio and frequency. As a result, a dispersion was confirmed in each subjects' characteristics of vibratory sensibility. Then, in older to classify of subjects, the vibration experiment was conducted with single direction, X (fore and aft), Y (lateral) and Z (vertical). We divided subjects into 3 groups from this result. Moreover, vibratory sensibility in the each group was investigated using frequency and amplitude ratio as input conditions. In this result, adequacy of the grouping was verified. Furthermore, the discomfort tended to increase with increasing the amplitude ratio X (fore and aft)-Z (vertical) in each group.
