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首页> 外文期刊>Journal of Biomechanics >Inertial compensation for belt acceleration in an instrumented treadmill
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Inertial compensation for belt acceleration in an instrumented treadmill

机译：仪器跑步机中皮带加速的惯性补偿

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Instrumented treadmills provide a convenient means for applying horizontal perturbations during gait or standing. However, varying the treadmill belt speed introduces inertial artifacts in the sagittal plane moment component of the ground reaction force. Here we present a compensation method based on a second-order dynamic model that predicts inertial pitch moment from belt acceleration. The method was tested experimentally on an unloaded treadmill at a slow belt speed with small random variations (1.20 +/- 0.10 m/s) and at a faster belt speed with large random variations (2.00 +/- 0.50 m/s). Inertial artifacts of up to 12 Nm (root-mean-square, RMS) and 30 Nm (peak) were observed. Coefficients of the model were calibrated on one trial and then used to predict and compensate the pitch moment of another trial with different random variations. Coefficients of determination (R-2) were 72.08% and 96.75% for the slow and fast conditions, respectively. After compensation, the root-mean-square (RMS) of the inertial artifact was reduced by 47.37% for the slow speed and 81.98% for fast speed, leaving only 1.5 Nm and 2.1 Nm of artifact uncorrected, respectively. It was concluded that the compensation technique reduced inertial errors substantially, thereby improving the accuracy in joint moment calculations on an instrumented treadmill with varying belt speed. (C) 2014 Elsevier Ltd. All rights reserved.
机译：仪器式跑步机提供了一种在步态或站立时施加水平扰动的便捷方式。但是，改变跑步机皮带的速度会在地面反作用力的矢状平面力矩分量中引入惯性伪影。在这里，我们提出了一种基于二阶动力学模型的补偿方法，该模型可根据皮带加速度预测惯性俯仰力矩。该方法已在无负荷跑步机上以较低的皮带速度（随机变化较小（1.20 +/- 0.10 m / s））和以较快的皮带速度（较大的随机变化（2.00±0.50 m / s））进行了测试。观察到的惯性伪影高达12 Nm（均方根，RMS）和30 Nm（峰值）。在一次试验中校准模型的系数，然后将其用于预测和补偿另一次试验具有不同随机变化的俯仰力矩。慢速和快速条件下的测定系数（R-2）分别为72.08％和96.75％。补偿后，惯性伪像的均方根（RMS）在低速时降低了47.37％，在高速时则降低了81.98％，仅分别修正了1.5 Nm和2.1 Nm的伪像。结论是，补偿技术大大降低了惯性误差，从而提高了带速变化的仪器式跑步机上联合力矩计算的准确性。 （C）2014 Elsevier Ltd.保留所有权利。

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