Morioka Miyuki, Griffin Michael J
Human Factors Research Unit, Institute of Sound and Vibration Research, University of Southampton, Southampton, SO17 1BJ, England, UK.
Human Factors Research Unit, Institute of Sound and Vibration Research, University of Southampton, Southampton, SO17 1BJ, England, UK.
Appl Ergon. 2015 Sep;50:200-6. doi: 10.1016/j.apergo.2015.03.013. Epub 2015 Apr 13.
The detection of a vibration may be reduced by the presence of another vibration: a phenomenon known as 'masking'. This study investigated how the detection of one frequency of vibration is influenced by vibration at another frequency. With nine subjects, thresholds for detecting fore-and-aft backrest vibration were determined (for 4, 8, 16, and 31.5-Hz sinusoidal vibration) in the presence of a masker vibration (4-Hz random vibration, 1/3-octave bandwidth at six intensities). The masker vibration increased thresholds for perceiving vibration at each frequency by an amount that reduced with increasing difference between the frequency of the sinusoidal vibration and the frequency of the masker vibration. The 4-Hz random vibration almost completely masked 4-Hz sinusoidal vibration, partially masked 8- and 16-Hz vibration, and only slightly masked 31.5-Hz vibration. The findings might be explained by the involvement of different sensory systems and different body locations in the detection of different frequencies of vibration.
这种现象被称为“掩蔽”。本研究调查了另一个频率的振动如何影响某一频率振动的检测。对九名受试者，在存在掩蔽振动（4赫兹随机振动，六个强度下的1/3倍频程带宽）的情况下，确定了检测前后靠背振动的阈值（针对4、8、16和31.5赫兹的正弦振动）。掩蔽振动使每个频率下感知振动的阈值增加，增加量随着正弦振动频率与掩蔽振动频率之间差异的增大而减小。4赫兹随机振动几乎完全掩蔽了4赫兹正弦振动，部分掩蔽了8赫兹和16赫兹振动，仅轻微掩蔽了31.5赫兹振动。这些发现可能是由于在检测不同频率振动时涉及不同的感觉系统和身体部位。
