Dynamic Contribution Analysis of Tennis-serve-motion in Consideration of Torque Generating Mode☆
Dynamic Contribution Analysis of Tennis-serve-motion in Consideration of Torque Generating Mode☆
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考虑扭矩产生方式的网球发球运动动态贡献分析☆
DOI：
10.1016/j.proeng.2014.06.020
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Yuhei Harada
中科院分区：
文献类型：
--
作者：
S. Koike;Yuhei Harada
本研究的目的是考虑网球发球动作中关节力矩的产生模式，量化上身关节力矩对球拍头部速度产生的动态作用作用。带有球拍的上半身被建模为由上肢、肩带、头部、上躯干和球拍组成的11个相连的系统。从系统的运动方程出发，计算了关节扭矩项、运动相关项、重力项和外力项对球拍头部速度的贡献。将关节扭矩分为偏心扭矩分量和同心扭矩分量，偏心扭矩分量表示关节扭矩功率的负号，同心扭矩分量表示关节扭矩功率的正号。提出了一种将运动相关项转换为其他项的算法。研究结果表明：1)运动相关项对碰撞前球拍头部速度的产生贡献最大；2)将运动相关项转换为其他项后，球拍头部速度主要由球拍侧肩关节绕内旋转轴偏心的扭矩分量获得。
The purpose of this study was to quantify dynamic functional roles of upper body joint torques to the generation of racket head speed in consideration of the joint torque generating mode in the tennis serve motion. The upper body with a racket was modelled as a linked eleven-segment system consisting of the upper limbs, shoulder girdles, head, upper trunk and the racket. The contributions of the joint torque term, motion-dependent term, gravitational term and external force term to the generation of racket head speed were calculated from the equation of motion for the system. Furthermore, the joint torque was divided into two components, such as eccentric torque component, which shows negative sign of its torque power, and concentric torque component, which shows positive sign of its torque power. An algorithm which converts the motion dependent term into other terms was proposed. The results obtained in this study showed that 1) motion dependent term was the great contributor to the generation of racket head speed prior to the impact and 2) after converting motion dependent term into other terms, racket head speed was mainly obtained by eccentric torque component about internal rotational axis at racket side shoulder joint.