田径旋转投掷项目的力偶和动量偶分析研究

Analysis on Momentun and Moment of Momentum in Track and Field

就田径旋转投掷项目 (铁饼、链球 )特殊的用力原理 ,就运动员在投掷过程中所涉及的有关力学原理进行尝试性的研究 ,提出了旋转过程中的动量偶和动量偶矩的概念 ,并探讨了动量偶的性质 ,结果显示 :1.动量偶矩相等的两动量偶等效 ;2 .旋转时动量偶对于任一点的矩就等于动量偶矩 ,而与矩心位置无关 ;3.只要动量偶矩保持不变 ,动量偶可在其所在平面内及彼此平行的平面内来计算物体整体转动的物理效果 ;而且只要动量偶矩保持不变 ,可将动量偶的动量和动量偶臂做相应的改变而不会改变其对物体整体旋转效应 ;4.等效的动量偶虽然不一定能较为圆满地描述旋转投掷具体的运动状态 。

Based on biomechanics theories . The article made attempt study on the special biomechanics principle of some rotating throwing events, put forward the concept of momentum and moment of momentum, and made a probe into the character of momentum. The article revealed that two momentums work equally if the moment of momentum are same, and the distance to any point in the plane becomes momentum. The article also showed that rotating moment effects can be calculated in the plane if we change the moment of momentum and moment of momentum arm.