A simple method for calibrating force plates and force treadmills using an instrumented pole.
A simple method for calibrating force plates and force treadmills using an instrumented pole.
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DOI：
10.1016/j.gaitpost.2008.06.010
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发表时间：
2009-01
期刊：
影响因子：
2.4
通讯作者：
Kuo, Arthur D.
中科院分区：
文献类型：
--
作者：
Collins, Steven H.;Adamczyk, Peter G.;Ferris, Daniel P.;Kuo, Arthur D.
我们提出了一种新的校准力板的方法，以减少压力中心位置，力和力矩的误差。这些误差可能是由于力板在地面上的安装不完美或在力板上安装跑步机造成的，这可能会引入扭曲的载荷。该方法被称为安装后最小二乘（PILS）校准，将以前几种方法的特征结合到一个简单的程序中。它需要一个动作捕捉系统和一个用于施加参考负载的仪表杆。参考载荷可以在任意位置和方向上手动施加到力板上。通过单轴测压元件测量负载大小，通过动作捕捉标记测量负载方向。然后将参考数据和不完善的力板信号组合成一个线性校准矩阵，同时最小化所有力和力矩的均方误差。我们将该程序应用于标准实验室力板，以及定制的分带力跑步机。我们还收集了一组独立的验证数据用于测试。所提出的校准程序可将力误差减少20%以上，力矩误差减少60%以上。标准测力板的压力中心误差也减少了63%，测力平板的压力中心误差减少了91%。仪表杆是有利的，因为它允许快速和任意负载应用，而不需要一个精确的夹具来对准负载。线性校准矩阵比非线性校正方程更简单，与标准数据采集软件更兼容，但它产生的误差减少可与更复杂的方法相媲美。
We propose a new method for calibrating force plates to reduce errors in center of pressure locations, forces, and moments. These errors may be caused by imperfect mounting of force plates to the ground or by installation of a treadmill atop a force plate, which may introduce distorting loads. The method, termed the Post-Installation Least-Squares (PILS) calibration, combines features of several previous methods into a simple procedure. It requires a motion capture system and an instrumented pole for applying reference loads. Reference loads may be manually applied to the force plate in arbitrary locations and directions. The instrumented pole measures applied load magnitudes through a single-axis load cell, and load directions through motion capture markers. Reference data and imperfect force plate signals are then combined to form a linear calibration matrix that simultaneously minimizes mean square errors in all forces and moments. We applied the procedure to standard laboratory force plates, as well as a custom-built, split-belt force treadmill. We also collected an independent set of verification data for testing. The proposed calibration procedure was found to reduce force errors by over 20%, and moment errors by over 60%. Center of pressure errors were also reduced by 63% for standard force plates and 91% for the force treadmill. The instrumented pole is advantageous because it allows for fast and arbitrary load application without needing a precise fixture for aligning loads. The linear calibration matrix is simpler than nonlinear correction equations and more compatible with standard data acquisition software, yet it yields error reductions comparable to more complex methods.
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影响因子：
2.4
作者：
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