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首页> 外文会议>International Symposium on Biomechanics in Sports vol.2; 20050822-27; Beijing(CN) >THE CALCULATION ON THE ROTATIONAL KINEMATICS ABOUT THE LONGITUDINAL AXIS OF JAVELIN BY THREE METHODS
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THE CALCULATION ON THE ROTATIONAL KINEMATICS ABOUT THE LONGITUDINAL AXIS OF JAVELIN BY THREE METHODS

机译：三种方法计算贾夫林纵向轴的旋转运动学。

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摘要

The motion of javelin is complicated after it is released. It is necessary to use some skills to calculate the rotation kinematics about the longitudinal axis of javelin. In this study, the Euler angle, the Cardan angle and the screw axis methods were used to calculate these kinematic variables. Two synchronized Redlake high-speed cameras (250 Hz) and a javelin with three fixed reflective markers were used in the experiment. Generally the results by three methods were close, and all of the three methods are suitable for the calculation on these variables. In the Euler angle and Cardan angle methods, the order of rotation sequence needs to be taken account, however no similar problem occurred in screw method. The results suggested that the longitudinal axis should be set as second axis in either Euler angle or Cardan angle methods to avoid Gimbal Lock (singularity) problem.
机译：标枪释放后的动作很复杂。有必要使用一些技巧来计算围绕标枪纵轴的旋转运动学。在这项研究中，欧拉角，万向角和螺杆轴方法被用来计算这些运动学变量。实验中使用了两个同步的Redlake高速相机（250 Hz）和一个带有三个固定反射标记的标枪。通常，三种方法的结果是接近的，并且三种方法都适合于这些变量的计算。在欧拉角和万向角方法中，需要考虑旋转顺序，但是在螺旋法中不会出现类似的问题。结果表明，应使用Euler角法或Cardan角法将纵轴设置为第二轴，以避免万向节锁定（奇异性）问题。

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