Combining forces and kinematics for calculating consistent centre of mass trajectories
Combining forces and kinematics for calculating consistent centre of mass trajectories
复制标题
结合力和运动学来计算一致的质心轨迹
DOI：
10.1242/jeb.057422
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发表时间：
2011
影响因子：
2.8
通讯作者：
Sten Grimmer
中科院分区：
文献类型：
--
作者：
H. Maus;A. Seyfarth;Sten Grimmer
摘要质心运动是生物力学分析中的一个基本研究对象。原则上，CoM运动可以从力数据（动态方法）或运动捕获数据（运动学方法）计算。在这两种方法中，计算轨迹的准确性取决于原始信号的质量。有趣的是，每种方法的不准确性都与傅立叶频谱的不同部分有关。在这里，我们提出了一种新的方法来计算CoM运动的基础上可靠的频率范围内的力和运动学测量。因此，我们获得物理上一致的CoM和力信号，即CoM轨迹的二阶导数等于力。该算法的仿真数据进行了验证，并适用于选定的实验数据。我们表明，新算法可以消除典型的不准确性固有的运动学和力信号。此外，我们还讨论了这些发现的生物和技术起源。
SUMMARY The motion of centre of mass (CoM) is a fundamental object of investigation in biomechanical analysis. In principle, the CoM motion can either be calculated from force data (dynamic method) or motion capture data (kinematic method). In both approaches, the accuracy of the calculated trajectories depends on the quality of the original signals. Interestingly, the inaccuracies in each method are related to different parts of the Fourier spectrum. Here, we present a new approach to compute CoM motion based on the reliable frequency range of force and kinematic measurements. As a result we obtain physically consistent CoM and force signals, i.e. the second derivative of the CoM trajectory equals the force. The algorithm is verified on simulation data and applied to selected experimental data. We show that the new algorithm can eliminate typical inaccuracies inherent in kinematic and force signals. Also, we discuss the biological and technical origins of these findings.