Although much is known about human body vibration discomfort, there is little research data on the effects of vibration on vehicle occupant drowsiness. A laboratory experimental setup has been developed. Vibration was applied to the volunteers sitting on the vehicle seat mounted on the vibration platform. Seated volunteers were exposed to a Gaussian random vibration, with 1–15 Hz frequency bandwidth at 0.2 ms−2 r.m.s., for 20-minutes. Two drowsiness measurement methods were used, Psychomotor Vigilance Test (PVT) and Karolinska Sleepiness Scale (KSS). Significant changes in PVT (p<0.05) and KSS (p<0.05) were detected in all eighteen volunteers. Furthermore, a moderate correlation (r>0.4) was observed between objective measurement (PVT) and subjective measurement (KSS). The results suggest that exposure to vibration even for 20-minutes can cause significant drowsiness impairing psychomotor performance. This finding has important implications for road safety.
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机译：尽管人们对人体振动不适感知之甚少，但是关于振动对乘员困倦的影响的研究数据很少。已经开发了实验室实验装置。对坐在安装在振动平台上的汽车座椅上的志愿者施加振动。入座的志愿者在0.2 ms −2 r.m.s.的高斯随机振动下以1–15 Hz的频率带宽暴露20分钟。使用了两种睡意测量方法，即心理运动警惕性测试（PVT）和卡罗林斯卡嗜睡量表（KSS）。在所有18名志愿者中均检测到PVT（p <0.05）和KSS（p <0.05）的显着变化。此外，在客观测量（PVT）和主观测量（KSS）之间观察到适度的相关性（r> 0.4）。结果表明，即使暴露在振动中20分钟也可能导致严重的睡意，从而削弱心理运动能力。这一发现对道路安全具有重要意义。
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