Donohew Barnaby E, Griffin Michael J
Human Factors Research Unit, Institute of Sound and Vibration Research, University of Southampton, Southampton, England.
Aviat Space Environ Med. 2004 Aug;75(8):649-56.
Low-frequency lateral oscillation is a cause of motion sickness in some forms of transport. However, the relationship between occurrence of sickness and the frequency of lateral oscillation is not known. This paper presents a study of motion sickness with lateral oscillation at frequencies between 0.0315 Hz and 0.20 Hz.
There were 120 subjects, in 6 groups of 20, who were exposed for up to 30 min to sinusoidal lateral oscillation with a peak velocity of 1.0 ms(-1) at one of six frequencies (0.0315, 0.05, 0.08, 0.125, 0.16, 0.20 Hz). Subjects provided ratings of their motion sickness symptoms at 1-min intervals.
There was a highly significant effect of the frequency of lateral oscillation on the occurrence of mild nausea.
The present results have been combined with those from a previous experiment conducted with higher frequencies of oscillation to produce a frequency weighting for motion sickness caused by lateral oscillation over the range 0.0315 to 0.8 Hz.
Mild nausea caused by lateral oscillation may be predicted by an acceleration frequency weighting that is independent of frequency from 0.0315 to 0.25 Hz and reduces at 12 dB per octave (i.e., proportional to displacement) from 0.25 to 0.8 Hz. This weighting differs from the frequency weighting currently used for predicting motion sickness caused by vertical oscillation. The frequency weighting for lateral oscillation may not be applicable in those environments in which there is roll motion during lateral oscillation.
低频横向振荡是某些交通方式中导致晕动病的一个原因。然而，晕动病的发生与横向振荡频率之间的关系尚不清楚。本文呈现了一项关于在0.0315赫兹至0.20赫兹频率范围内横向振荡引起的晕动病的研究。
共有120名受试者，分为6组，每组20人，他们在六个频率（0.0315、0.05、0.08、0.125、0.16、0.20赫兹）之一，以1.0米每秒（-1）的峰值速度暴露于正弦横向振荡中长达30分钟。受试者每隔1分钟对其晕动病症状进行评分。
横向振荡频率对轻度恶心的发生有极显著影响。
目前的结果与之前在更高振荡频率下进行的实验结果相结合，得出了0.0315至0.8赫兹范围内横向振荡引起的晕动病的频率加权。
由横向振荡引起的轻度恶心可以通过一种加速度频率加权来预测，该加权在0.0315至0.25赫兹范围内与频率无关，在0.25至0.8赫兹范围内以每倍频程12分贝的速率降低（即与位移成比例）。这种加权不同于目前用于预测垂直振荡引起的晕动病的频率加权。横向振荡的频率加权可能不适用于横向振荡期间存在侧倾运动的环境。
