Mansfield N J, Griffin M J
Human Factors Research Unit, Institute of Sound and Vibration Research, University of Southampton, UK.
Appl Ergon. 2000 Jun;31(3):255-61. doi: 10.1016/s0003-6870(99)00054-x.
Reductions in vehicle vibration that may contribute to improvements in overall vehicle ride could individually be too small to be detected by drivers or passengers. This study investigated the 'difference threshold' (the difference in magnitude between two stimuli which is just sufficient for their difference to be detected) required for a change in vehicle ride to be perceived and whether this was consistent with Weber's Law. Ten male and 10 female subjects sat in a car seat and were exposed to four different reproductions of the vertical vibration recorded on the seat of a car. Three of the stimuli had the same waveform recorded while the car traversed a tarmac surface. This waveform was reproduced using three different magnitudes of vibration at the seat: 0.2, 0.4 and 0.8 m s(-2) r.m.s. (Wb weighted). The other stimulus was recorded with the car traversing a 'pavé' surface that gave a different waveform that was reproduced at a magnitude of 0.4 m s(-2) r.m.s. (Wb weighted). There were significant differences in the absolute difference thresholds measured using the same waveform at the three different magnitudes. When the difference thresholds were expressed in relative terms (the proportion by which two stimuli must differ in magnitude to be discriminated), the relative difference thresholds were approximately 13%, and independent of both the vibration magnitude and the vibration waveform. The results are therefore consistent with Weber's Law. No consistent differences were observed between the responses of male and female subjects.
车辆振动的降低可能有助于改善整体驾乘体验，但这种降低幅度可能过小，驾驶员或乘客难以察觉。本研究调查了感知车辆驾乘体验变化所需的“差异阈值”（两种刺激强度的差异，刚好足以被检测到），以及这是否符合韦伯定律。十名男性和十名女性受试者坐在汽车座椅上，接触在汽车座椅上记录的四种不同的垂直振动再现。其中三种刺激是在汽车行驶在柏油路面时记录的相同波形。该波形在座椅上以三种不同的振动强度再现：0.2、0.4和0.8米每二次方秒均方根（加权）。另一种刺激是在汽车行驶在“铺路石”路面时记录的，其波形不同，以0.4米每二次方秒均方根（加权）的强度再现。在三种不同强度下使用相同波形测量的绝对差异阈值存在显著差异。当差异阈值以相对术语表示（两种刺激强度必须相差的比例才能被区分）时，相对差异阈值约为13%，且与振动强度和振动波形均无关。因此，结果符合韦伯定律。在男性和女性受试者的反应之间未观察到一致的差异。
