Arnold James J, Griffin Michael J
a Institute of Sound and Vibration Research , University of Southampton , Southampton , United Kingdom.
Ergonomics. 2018 Nov;61(11):1545-1559. doi: 10.1080/00140139.2018.1517900. Epub 2018 Nov 20.
Standards assume vibration discomfort depends on the frequency and direction of whole-body vibration, with the same weightings for frequency and direction at all magnitudes. This study determined equivalent comfort contours from 1.0 to 10 Hz in each of three directions (fore-and-aft, lateral, vertical) at magnitudes in the range 0.1 to 3.5 ms r.m.s. Twenty-four subjects sat on a rigid flat seat with and without a beanbag, altering the pressure distribution on the seat but not the transmission of vibration. The rate of growth of vibration discomfort with increasing magnitude of vibration differed between the directions of vibration and varied with the frequency of vibration. The frequency-dependence and direction-dependence of discomfort, therefore, depended on the magnitude of vibration. The beanbag did not affect the frequency-dependence or direction-dependence of vibration discomfort. It is concluded that different weightings for the frequency and direction of vibration are required for low and high magnitude vibration. Practitioner summary: When evaluating whole-body vibration to predict vibration discomfort, the weightings appropriate to different frequencies and different directions of vibration should depend on the magnitude of vibration. This is overlooked in all current methods of evaluating the severity of whole-body vibration.
标准假定振动不适感取决于全身振动的频率和方向，且在所有强度下频率和方向的加权相同。本研究确定了在0.1至3.5毫秒均方根值范围内，三个方向（前后、横向、垂直）中每个方向从1.0至10赫兹的等效舒适轮廓。24名受试者坐在有或没有豆袋的刚性平座椅上，改变了座椅上的压力分布，但没有改变振动传递。随着振动强度增加，振动不适感的增长速率在不同振动方向之间存在差异，并且随振动频率而变化。因此，不适感的频率依赖性和方向依赖性取决于振动强度。豆袋并未影响振动不适感的频率依赖性或方向依赖性。得出的结论是，对于低强度和高强度振动，需要对振动的频率和方向采用不同的加权。从业者总结：在评估全身振动以预测振动不适感时，适用于不同频率和不同振动方向的加权应取决于振动强度。这在当前所有评估全身振动严重程度的方法中都被忽视了。
