低周波帯域における人体振動特性と不快感の相関性検証

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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. This research was conducted using two real cars having different riding comfort. We recognized that there were differences in the acceleration magnitude, frequency, phase, and the acceleration amplitude ratio of the drivers head response for a frequency under 3Hz. Therefore, using these as the input parameters, we investigated the sensibility characteristics in a shaking experiment, with a driving posture, to identify the parameters that affect the sensation during driving. We conducted vibration experiment using ordinary sine waves with two different directions, X (fore and aft)-Z (vertical) and Y (lateral)-Z (vertical). As a result, the riding sensation tends to depend on the frequency and the amplitude ratio. Next, we measured the human body response using input conditions which had shown differences of sensation in the experimental results of sensibility characteristics. Measurement points were pre-head, occipital, chest, pelvis, and ischium. Moreover, we analyzed human vibration responses by observing the relative movements of body parts from side-view and rear-view. We verified correlation between these responses and sensations. As a result, this study shows that riding comfort can be improved by decreasing lateral vibration at chest and pelvis.

低周波帯域における人体振動特性と不快感の相関性検証

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