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首页> 外文期刊>Applied Ergonomics >Predicting discomfort from whole-body vertical vibration when sitting with an inclined backrest
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Predicting discomfort from whole-body vertical vibration when sitting with an inclined backrest

机译：坐着倾斜的靠背时，通过全身垂直振动来预测不适

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摘要

Current methods for evaluating seat vibration to predict vibration discomfort assume the same frequency weightings and axis multiplying factors can be used at the seat surface and the backrest irrespective of the backrest inclination. This experimental study investigated the discomfort arising from whole-body vertical vibration when sitting on a rigid seat with no backrest and with a backrest inclined at 0° (upright), 30°, 60°, and 90° (recumbent). Within each of these five postures, 12 subjects judged the discomfort caused by vertical sinusoidal whole-body vibration (at frequencies from 1 to 20 Hz at magnitudes from 0.2 to 2.0 m s~(-2) r.m.s.) relative to the discomfort produced by a reference vibration (8 Hz at 0.4 m s~(-2) r.m.s.). With 8-Hz vertical vibration, the subjects also judged vibration discomfort with each backrest condition relative to the vibration discomfort with no backrest. The locations in the body where discomfort was experienced were determined for each frequency at two vibration magnitudes. Equivalent comfort contours were determined for the five conditions of the backrest and show how discomfort depends on the frequency of vibration, the presence of the backrest, and the backrest inclination. At frequencies greater than about 8 Hz, the backrest increased vibration discomfort, especially when inclined to 30°, 60°, or 90°, and there was greater discomfort at the head or neck. At frequencies around 5 and 6.3 Hz there was less vibration discomfort when sitting with an inclined backrest.
机译：当前评估座椅振动以预测振动不适的方法假定，无论靠背倾斜度如何，都可以在座椅表面和靠背上使用相同的频率加权和轴倍数因子。这项实验研究调查了坐在没有靠背且靠背倾斜0°（直立），30°，60°和90°（倾斜）的刚性座椅上时，由于全身垂直振动引起的不适感。在这五个姿势中的每个姿势中，有12位受试者判断相对于参考者产生的不适，由垂直正弦波全身振动引起的不适感（频率从1到20 Hz，幅度从0.2到2.0 ms〜（-2）rms）。振动（0.4 ms〜（-2）rms时为8 Hz）。相对于没有靠背的振动不适，在垂直振动为8 Hz的情况下，受试者还可以判断每种靠背状况的振动不适。对于在两个振动幅度下的每个频率，确定身体中经历不适的位置。确定了五种靠背状况的等效舒适度轮廓，并显示了不适感如何取决于振动频率，靠背的存在和靠背倾斜度。在大于约8 Hz的频率下，靠背会增加振动不适感，尤其是在倾斜到30°，60°或90°时，并且头或颈部的不适感更大。靠背靠背坐着时，在5和6.3 Hz左右的频率下，振动不适感较小。

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