Morioka M, Griffin M J
Human Factors Research Unit, Institute of Sound and Vibration Research, University of Southampton, United Kingdom.
J Acoust Soc Am. 2000 Jan;107(1):620-4. doi: 10.1121/1.428331.
Difference thresholds for seated subjects exposed to whole-body vertical sinusoidal vibration have been determined at two vibration magnitudes [0.1 and 0.5 ms(-2) root mean square (r.m.s.)] and at two frequencies (5 and 20 Hz). For 12 subjects, difference thresholds were determined using the up-and-down transformed response method based on two-interval forced-choice tracking. At both frequencies, the difference thresholds increased by a factor of five when the magnitude of the vibration increased from 0.1 to 0.5 ms(-2) r.m.s. The median relative difference thresholds, Weber fractions (deltaI/I), expressed as percentages, were about 10% and did not differ significantly between the two vibration magnitudes or the two frequencies. It is concluded that for the conditions investigated the difference thresholds for whole-body vibration are approximately consistent with Weber's Law. A vibration magnitude will need to be reduced by more than about 10% for the change to be detectable by human subjects; vibration measurements will be required to detect reductions of less than 10%.
已在两种振动强度[0.1和0.5米每二次方秒均方根（r.m.s.）]以及两种频率（5和20赫兹）下测定了坐姿受试者全身垂直正弦振动的差别阈。对于12名受试者，基于双间隔强迫选择跟踪，采用上下变换响应法测定差别阈。在两个频率下，当振动强度从0.1米每二次方秒均方根增加到0.5米每二次方秒均方根时，差别阈增加了五倍。以百分比表示的中位数相对差别阈，即韦伯分数（δI/I）约为10%，在两种振动强度和两种频率之间没有显著差异。得出的结论是，在所研究的条件下，全身振动的差别阈大致符合韦伯定律。振动强度需要降低超过约10%，人体受试者才能检测到变化；需要进行振动测量才能检测到小于10%的降低。
