Modelling the apparent mass of the standing human body under whole-body vibration training conditions
Modelling the apparent mass of the standing human body under whole-body vibration training conditions
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DOI：
10.1177/0954411920917311
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发表时间：
2020-05-06
期刊：
影响因子：
1.8
通讯作者：
Taiar, Redha
中科院分区：
文献类型：
--
作者：
Nawayseh, Naser;Hamdan, Sadeque;Taiar, Redha
一些研究已经测量了振动训练条件下传递到人体和通过人体的振动。然而，没有工作模拟在这种条件下人体的表观质量。在这项工作中，一个2自由度模型已被开发出来，预测全身振动训练条件下站立人体的表观质量。模型的参数进行了优化，使用测量的表观质量的12名受试者站在不同的膝盖角度为180度，165度，150度和135度。预测和测量的表观质量之间的误差小于3公斤的中位数表观质量大小和误差小于6度的表观质量相位角的良好协议。12个个体表观质量的优化参数中位数接近12例受试者表观质量中位数的相应优化参数。相比，站立与伸展的腿，弯曲的膝盖被发现主要影响的参数（即刚度和阻尼）的模型接近的振动源。弯曲膝盖减少了靠近振动源的模型的质量，增加了远离振动源的质量。在弯曲膝盖的姿势中，模型参数的变化通常不显著。该模型可用作全身振动训练机制造商在设计阶段和/或生产后测试机器性能的工具。这将减少人类受试者的实验次数，从而保证一致性，可重复性，节省时间和安全性。
Several studies have measured the vibration transmitted to and through the human body under vibration training conditions. However, no work has modelled the apparent mass of the human body under such conditions. In this work, a 2 degree-of-freedom model has been developed to predict the apparent mass of the standing human body under whole-body vibration training conditions. The parameters of the model were optimised using measured apparent mass of 12 subjects standing with different knee angle of 180 degrees, 165 degrees, 150 degrees and 135 degrees. Good agreement was found between the predicted and measured apparent mass with errors less than 3 kg in the median apparent mass magnitude and errors less than 6 degrees in the apparent mass phase angle. The medians of the optimised parameters of the 12 individual apparent masses were close to the corresponding optimised parameters of the median apparent mass of the 12 subjects. Compared to standing with extended legs, bending the knees was found to affect mainly the parameters (i.e. stiffness and damping) of the model close to the source of vibration. Bending the knees decreased the mass of the model close to the source of vibration and increased the mass away from the source of vibration. Among the postures with bent knees, the change in the model parameters was generally not significant. The model can be used as a tool by manufacturers of whole-body vibration training machines to test the performance of the machines during the design stage and/or after production. This will decrease the number of experimentations with human subjects which guarantees consistency, repeatability, time-saving and safety.