Institute of Sound and Vibration Research, University of Southampton, Southampton, UK.
Ergonomics. 2012;55(8):909-22. doi: 10.1080/00140139.2012.678390. Epub 2012 Apr 26.
This study determined how backrest inclination and the frequency and magnitude of vertical seat vibration influence vibration discomfort. Subjects experienced vertical seat vibration at frequencies in the range 2.5-25 Hz at vibration magnitudes in the range 0.016-2.0 ms(-2) r.m.s. Equivalent comfort contours were determined with five backrest conditions: no backrest, and with a stationary backrest inclined at 0° (upright), 30°, 60° and 90°. Within all conditions, the frequency of greatest sensitivity to acceleration decreased with increasing vibration magnitude. Compared to an upright backrest, around the main resonance of the body, the vibration magnitudes required to cause similar discomfort were 100% greater with 60° and 90° backrest inclinations and 50% greater with a 30° backrest inclination. It is concluded that no single frequency weighting provides an accurate prediction of the discomfort caused by vertical seat vibration at all magnitudes and with all backrest conditions.
Vertical seat vibration is a main cause of vibration discomfort for drivers and passengers of road vehicles. A frequency weighting has been standardised for the evaluation of vertical seat vibration when sitting upright but it was not known whether this weighting is suitable for the reclined sitting postures often adopted during travel.
本研究旨在探讨靠背倾斜角度和垂直座椅振动的频率和幅度对振动不适的影响。研究对象在 2.5-25 Hz 的频率范围内经历垂直座椅振动，振动幅度在 0.016-2.0 ms(-2) r.m.s. 范围内。在五种靠背条件下确定了等效舒适度轮廓：无靠背和固定靠背分别倾斜 0°（直立）、30°、60°和 90°。在所有条件下，对加速度最敏感的频率随振动幅度的增加而降低。与直立靠背相比，在身体的主要共振频率附近，引起相似不适所需的振动幅度在 60°和 90°靠背倾斜时增加了 100%，在 30°靠背倾斜时增加了 50%。因此得出结论，没有单一的频率加权能够准确预测在所有幅度和所有靠背条件下垂直座椅振动引起的不适。
垂直座椅振动是道路车辆驾驶员和乘客振动不适的主要原因。已经为坐姿垂直座椅振动评估制定了频率加权标准，但尚不清楚该加权标准是否适用于旅行中经常采用的倾斜坐姿。
