摘要
压力中心(COP)测量在评价人体平衡功能的实验中有着广泛的应用,本文介绍了一种基于FPGA的平衡功能测试系统,该系统以FPGA作为控制核心,实现了六个力分量的同步测量,动态测量出被试者压力中心并绘制轨迹。针对高频干扰严重影响测量准确性的问题,对数据预处理中平滑窗的合理设置展开了实验研究。实验结果表明,使用二分之一数据帧长度的均值平滑窗能有效提高轨迹平滑度。基于本系统,采用不同负重的方式进行工效评估,证明本系统能准确评价平衡功能。测量过程中应根据晃动剧烈程度选择动摇轨迹总长度和轨迹包络面积这两个指标作为评价依据。
In experiment for evaluation of human body balance function, the center of pressure （COP） trajectory measuring method has been widely used. This paper introduces a kind of balance func-tion test system based on FPGA. As the control center of the system, it realizes the measurement of six forces synchronously, calculating the center of pressure （ COP） and plotting the trajectory simultaneously. Aimed at the problem that high frequency interference seriously affects accuracy of the measurement, re-search about reasonable setting of the smooth window in data preprocessing has been carried out. The re-sult shows that using a smooth window which is half the length of the data frame can improve the smooth-ness of the trajectory effectively. Based on this system,experiment has been carried out using the method of bearing load to evaluate ergonomics. The result shows that this system can evaluate balance function ac-curately. During measurement,the length of trajectory and the area of envelope curve should be chosen depending on the shaking intensity to evaluate the balance function.
出处
《宇航计测技术》
CSCD
2017年第2期22-25,21,共5页
Journal of Astronautic Metrology and Measurement
基金
国家自然科学基金重大项目(61190124)
国家科技支撑计划重点项目课题(2009BAI71B06)
关键词
压力中心
平衡能力
轨迹平滑
Balance function Center of pressure Trajectory smoothness
