Basic study on the relationship between subjective perception of vibration and actual body vibrations induced by low-frequency noise

我们测量了在8个频率（16、20、25、31.5、40、50、63和80 Hz）下体验“头部感知振动”的阈值水平，这是本研究最初定义的，以及“头部感知振动”的等效感觉水平。用于测量等感水平的参考音调是50-Hz， 80-dB(Z)和50-Hz， 85-dB(Z)音调。在测量阈值水平和相等感觉水平的同时，研究人员还测量了受试者头部三个位置的实际头部振动。实际的头部振动水平并不高，这表明由低或中等水平的低频噪声引起的实际头部振动对头部振动的感知几乎没有贡献。

We measured the threshold levels for experiencing "vibration perceived in the head," which was originally defined in this study, and the equal-sensation levels for "vibration perceived in the head" at eight frequencies (16, 20, 25, 31.5, 40, 50, 63, and 80 Hz). The reference tones used for measuring the equal-sensation levels were 50-Hz, 80-dB(Z) and 50-Hz, 85-dB(Z) tones. While measuring the threshold levels and the equal-sensation levels, actual head vibrations of the subject were also measured at three locations on the head. The levels of the actual head vibrations were found to be not high, suggesting that the actual head vibrations induced by low- or moderate-level low-frequency noise hardly contributed to the perception of vibration in the head.