In order to control the interior vibration of buildings and vehicles, a proper model of human bodies needs to be developed to predict their dynamic responses under different conditions. So far, most of the previous studies are concentrated on the biodynamic responses to the vibration at relatively low frequencies (<20 Hz) and small magnitudes (acceleration<1.5 ms-2), which may not be suitable for prediction of the human body responses to vibration at relatively high frequencies (>20 Hz) and large magnitudes (acceleration>1.5 ms-2). The present study proposes a modified 7 degrees-of-freedom (DOF) model to predict the biodynamic response of the seating human bodies to the vertical vibration at relatively high frequencies and large magnitudes. An experiment is conducted to measure the apparent mass of the seating human bodies on 25 volunteers (13 males and 12 females) with random vertical vibration at 2 Hz-100 Hz and four different acceleration magnitudes (1.0 m/s2, 1.5 m/s2, 2.0 m/s2 and 2.5 m/s2). The experimental data are compared with the prediction data to identify the parameters of the 7-DOF model. The results show that the modified 7-DOF model can predict the dynamic response of the seating human bodies to the vertical vibration at frequencies higher than 20 Hz and magnitudes larger than 1.0 m/s2 more accurately than the 3-DOF model suggested in the international standard.%建立合适的人体振动模型,预测人体在不同振动环境下的动力学响应和各部位振动的传递性,能够对建筑和交通工具内部的振动控制起到指导作用.到目前为止,大多数垂直振动下的人体多自由度模型都是针对较低频率(<20 Hz)和较小幅度(<1.5 ms-2)的振动环境,未必适用于较高频率(>20 Hz)和较大幅度(>1.5 ms-2)的垂向振动环境.为了准确地预测坐姿人体对中高频、大振幅垂向振动的动力学响应,建立垂向振动下坐姿人体的7自由度修正模型,并通过实验测试25名志愿者在4种不同加速度幅值(1.0 m/s2、1.5 m/s2、2.0 m/s2、2.5 m/s2)的宽带随机(2~100 Hz)垂向振动下的视在质量.实验结果表明,相比ISO标准规定的3自由度模型,所提出的7自由度修正模型能较准确地预测坐姿人体对大振幅垂向振动的动力学响应.
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