CONCAVE Research Center, Concordia University, 1455 de Maisonneuve West, Montreal, Quebec, H3G 1M8, Canada.
Ind Health. 2010;48(5):698-714. doi: 10.2486/indhealth.mswbvi-15.
The apparent mass and seat-to-head-transmissibility response functions of the seated human body are investigated under exposures to fore-aft (x), lateral (y), and combined fore-aft and lateral (x and y) axis whole-body vibration. The experiments were performed to study the effects of hands support, back support and vibration magnitude on the body interactions with the seat pan and the backrest, characterised in terms of fore-aft and lateral apparent masses and the vibration transmitted to the head under single and dual-axis horizontal vibration. The data were acquired with 9 subjects exposed to two different magnitudes of vibration applied along the individual x- and y- axis (0.25 and 0.4 m/s(2) rms), and along both the-axis (0.28 and 0.4 m/s(2) rms) in the 0.5 to 20 Hz frequency range, and analyzed to derive the biodynamic responses. A method was further derived to obtain total seated body apparent mass response from those measured at the backrest and the seatpan. The results revealed coupled effects of hands and back support conditions on the responses, while the vibration magnitude effect was relatively small. For a given postural condition, the biodynamic responses to dual-axis vibration could be estimated from the direct- and cross-axis responses to single-axis vibration, suggesting weakly nonlinear behaviour.
本文研究了人体在前后向（x 轴）、侧向（y 轴）和前后向与侧向组合（x 和 y 轴）全身振动暴露下的表观质量和座椅到头传递率响应函数。进行这些实验是为了研究在双手支撑、背部支撑和振动幅度的影响下，身体与座椅和靠背之间的相互作用，其特征在于在单轴和双轴水平振动下的前后向和侧向表观质量以及传递到头的振动。使用 9 名受试者在单独的 x 轴和 y 轴（0.25 和 0.4 m/s(2) rms）以及两个轴（0.28 和 0.4 m/s(2) rms）上施加两个不同振动幅度的情况下，在 0.5 至 20 Hz 频率范围内采集数据，并进行分析以得出生物动力学响应。进一步推导出一种方法，可从靠背和座椅上测量的结果中得出总坐姿人体表观质量响应。结果表明，手和背部支撑条件的耦合效应对响应有影响，而振动幅度的影响相对较小。对于给定的姿势条件，双轴振动的生物动力学响应可以从单轴振动的直接和交叉轴响应来估计，这表明存在弱非线性行为。
