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首页> 外文期刊>Journal of Biomechanics >The influence of soft tissue movement on ground reaction forces, joint torques and joint reaction forces in drop landings.
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The influence of soft tissue movement on ground reaction forces, joint torques and joint reaction forces in drop landings.

机译：软组织运动对降落平台中地面反作用力，关节扭矩和关节反作用力的影响。

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The aim of this study was to determine the effects that soft tissue motion has on ground reaction forces, joint torques and joint reaction forces in drop landings. To this end a four body-segment wobbling mass model was developed to reproduce the vertical ground reaction force curve for the first 100 ms of landing. Particular attention was paid to the passive impact phase, while selecting most model parameters a priori, thus permitting examination of the rigid body assumption on system kinetics. A two-dimensional wobbling mass model was developed in DADS (version 9.00, CADSI) to simulate landing from a drop of 43 cm. Subject-specific inertia parameters were calculated for both the rigid links and the wobbling masses. The magnitude and frequency response of the soft tissue of the subject to impulsive loading was measured and used as a criterion for assessing the wobbling mass motion. The model successfully reproduced the vertical ground reaction force for the first 100 ms of the landing with a peak vertical ground reaction force error of 1.2% and root mean square errors of 5% for the first 15 ms and 12% for the first 40 ms. The resultant joint forces and torques were lower for the wobbling mass model compared with a rigid body model, up to nearly 50% lower, indicating the important contribution of the wobbling masses on reducing system loading.
机译：这项研究的目的是确定软组织运动对降落平台中地面反作用力，关节扭矩和关节反作用力的影响。为此，建立了一个四段摆动质量模型，以再现着陆前100 ms的垂直地面反作用力曲线。在预先选择大多数模型参数的同时，特别注意了被动冲击阶段，因此可以检查刚体对系统动力学的假设。在DADS（版本9.00，CADSI）中开发了二维摆动质量模型，以模拟从43厘米高的下落着陆。针对刚性连杆和摆动质量都计算了特定于受试者的惯性参数。测量对象的软组织对脉冲负荷的大小和频率响应，并将其用作评估摆动质量运动的标准。该模型成功再现了着陆的前100 ms的垂直地面反作用力，其峰值垂直地面反作用力误差为1.2％，并且在前15 ms的均方根误差为5％，在前40 ms的均方根误差为12％。与刚体模型相比，摆动质量模型的合成关节力和扭矩更低，降低了近50％，这表明摆动质量对减少系统负载具有重要作用。

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