Mansfield Neil J, Maeda Setsuo
Department of Human Sciences, Loughborough University, Loughborough, Leicestershire, LE11 3TU, United Kingdom.
J Acoust Soc Am. 2005 Jun;117(6):3853-9. doi: 10.1121/1.1898703.
Previous studies have shown that the seated human is most sensitive to whole-body vertical vibration at about 5 Hz. Similarly, the body shows an apparent mass resonance at about 5 Hz. Considering these similarities between the biomechanical and subjective responses, it was hypothesized that, at low frequencies, subjective ratings of whole-body vibration might be directly proportional to the driving force. Twelve male subjects participated in a laboratory experiment where subjects sat on a rigid seat mounted on a shaker. The magnitude of a test stimulus was adjusted such that the subjective intensity could be matched to a reference stimulus, using a modified Bruceton test protocol. The sinusoidal reference stimulus was 8-Hz vibration with a magnitude of 0.5 m/s2 rms (or 0.25 m/s2 rms for the 1-Hz test); the sinusoidal test stimuli had frequencies of 1, 2, 4, 16, and 32 Hz. Equal sensation contours in terms of seat acceleration showed data similar to those in the literature. Equal sensation contours in terms of force showed a nominally linear response at 1, 2, and 4 Hz, but an increasing sensitivity at higher frequencies. This is in agreement with a model derived from published subjective and objective fitted data.
先前的研究表明，就座的人对约5赫兹的全身垂直振动最为敏感。同样，身体在约5赫兹时表现出明显的质量共振。考虑到生物力学反应和主观反应之间的这些相似性，有人推测，在低频时，全身振动的主观评级可能与驱动力成正比。12名男性受试者参与了一项实验室实验，受试者坐在安装在振动台上的刚性座椅上。使用改良的布鲁西顿测试方案，调整测试刺激的强度，使主观强度能够与参考刺激相匹配。正弦参考刺激为8赫兹振动，强度为0.5米/秒²均方根（对于1赫兹测试为0.25米/秒²均方根）；正弦测试刺激的频率为1、2、4、16和32赫兹。就座椅加速度而言的等感觉轮廓显示的数据与文献中的数据相似。就力而言的等感觉轮廓在1、2和4赫兹时显示出名义上的线性响应，但在较高频率时灵敏度增加。这与从已发表的主观和客观拟合数据得出的模型一致。
