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首页> 外文期刊>International Journal of Industrial Ergonomics >The role of seat geometry and posture on the mechanical energy absorption characteristics of seated occupants under vertical vibration
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The role of seat geometry and posture on the mechanical energy absorption characteristics of seated occupants under vertical vibration

机译：座椅几何形状和姿势对垂直振动下乘员机械能吸收特性的影响

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摘要

The power absorption characteristics of 27 male and female seated subjects, exposed to vertical vibration in the 0.5-40 Hz frequency range, are characterized under different sitting postures. The measurements are performed for a total of 36 different sitting postural configurations realized through variations in hands position (in lap and on steering wheel), seat heights (510, 460 and 410 mm), and seat design factors involving pan (0° and 7.5°) and backrest (0° and 12°) orientations, and different back support conditions. The measured data, expressed in terms of the vertical absorbed power density, are analyzed to study the effects of sitting posture on the biodynamic response under whole-body vertical vibration. An indirect method of computing absorbed power from the apparent mass response is formulated and validated using the directly measured absorbed power data. The measured data were analyzed to study the dependence of vibration energy absorption on various factors related to anthropometry (body mass, fat and mass index), seat geometry and sitting postures. The strong linear dependence between the absorbed power and the body mass and body mass index were revealed over the frequency range considered. The results clearly validate that the power absorption strongly depends upon the magnitude of whole-body vibration. Both the absorbed power near the primary resonance and the total power increase nearly quadratically with the exposure level. The hands in lap sitting posture yields to higher power absorption, irrespective of the back support condition. The sitting with a backrest reduces the energy dissipation at low frequencies and increases the energy absorption at frequencies above resonance, irrespective of the hands position, while the influence of seat pan inclination is negligible within the range of angles investigated.
机译：在不同的坐姿下表征了27位男女坐着的受试者在0.5-40 Hz频率范围内承受垂直振动的功率吸收特性。通过改变手的位置（在膝上和方向盘上），座椅高度（510、460和410 mm）以及涉及底盘（0°和7.5）的座椅设计系数实现了总共36种不同的坐姿配置°）和靠背（0°和12°）方向，以及不同的靠背条件。分析以垂直吸收功率密度表示的测量数据，以研究坐姿对全身垂直振动下生物力学响应的影响。通过直接测量的吸收功率数据，制定并验证了一种根据表观质量响应计算吸收功率的间接方法。分析测量数据以研究振动能量吸收对人体测量学（体重，脂肪和质量指数），座椅几何形状和坐姿等各种因素的依赖性。在所考虑的频率范围内揭示了吸收功率与体重和体重指数之间的强线性关系。结果清楚地证明了功率吸收在很大程度上取决于全身振动的大小。初级共振附近的吸收功率和总功率都几乎与曝光水平成正比增加。不论背部支撑状况如何，处于膝部坐姿的双手都可以吸收更高的功率。带有靠背的座位减少了低频处的能量耗散，并提高了高于共振频率的能量吸收，而与手的位置无关，而在研究的角度范围内，座板倾斜的影响可以忽略不计。

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