体育运动中一定高度自由下落人体受冲力的实验值与理论值比较分析

使用SAFMS测力平台,分别测量人体从15 cm和40 cm高度自由下落时有缓冲和无缓冲两组落地动作所受冲力的实验值,在取与地面接触时间相等的条件下,运用能量守衡和动量定理分别计算出有缓冲和无缓冲着地所受冲力的理论值。通过理论值与实际值之间的差异比较分析,得出理论的平均冲力和测量的最大冲力值差异很大,给出了差异倍数的区间,进而指明在应用动量定理计算冲力值要注意的问题。

Differences Between Theoretical Values and Experimental Values About Forces Changing with the Hight of Droping in Sports

Using the SAFMS force plate,respectively measured the experimental values of impact forces droping with buffer and no buffer from the height of 15cm and 40cm.In the same contacting time,both theory values were calculated with the principle of conservation of mechanical energy and momentum.From the differences between theoretical values and experimental values,the study indicated that average forces of theory is different to maximal forces of experiment,which have a multiple relationship;indicated the problem should be noticed when calculate the values of impact forces by using the principle of momentum.