The control of non-twisting somersaults using configuration changes
The control of non-twisting somersaults using configuration changes
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DOI：
10.1016/0021-9290(96)00034-6
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发表时间：
1996-10-01
影响因子：
2.4
通讯作者：
Mikulcik, EC
中科院分区：
文献类型：
--
作者：
Yeadon, MR;Mikulcik, EC
理论分析表明，刚体绕中主转动惯量对应的主轴转动是不稳定的。这对在布局配置中执行双周翻而不扭转的体操运动员来说是一个潜在的问题。一个计算机仿真模型是用来调查控制这种运动的配置策略。结果表明，建立扭曲是不减少外展的武器，但可以通过采用配置与足够的身体屈曲控制。对于直身翻筋斗，基于扭转角速度和角加速度的非对称手臂外展加速度形式的控制能够防止扭转的积累，只要反馈时间延迟小于四分之一个筋斗。版权所有（C）1996 Elsevier Science Ltd.
Theoretical analyses have shown that rotations of a rigid body about the principal axis corresponding to the intermediate principal moment of inertia are unstable. This poses a potential problem for gymnasts who perform double somersaults without twist in a layout configuration. A computer simulation model is used to investigate configurational strategies for controlling such movements. It is shown that the build up of twist is not reduced by abduction of the arms but can be controlled by adopting a configuration with sufficient body flexion. For somersaults with a straight body, control in the form of asymmetrical arm abduction accelerations, based upon twist angular velocity and angular acceleration, is capable of preventing a build up of twist providing that the feedback time delay is less than a quarter somersault. Copyright (C) 1996 Elsevier Science Ltd.