Prediction of Impact Shock Vibrations at Tennis Player's Wrist Joint: Comparison between Conventional Weight Racket and Light Weight Racket with Super Large Head Size
Prediction of Impact Shock Vibrations at Tennis Player's Wrist Joint: Comparison between Conventional Weight Racket and Light Weight Racket with Super Large Head Size
复制标题
网球运动员腕关节冲击振动预测：传统重量球拍与超大拍头轻量球拍的比较
DOI：
10.1299/jsdd.4.331
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Keiko Yoshinari
中科院分区：
文献类型：
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作者：
Yoshihiko Kawazoe;Yukihiro Takeda;M. Nakagawa;F. Casolo;R. Tomosue;Keiko Yoshinari
手柄轻结构和大头尺寸的轻量化球拍是高科技网球拍的最新趋势，随着球拍摆动速度的增加，增加力量或撞击后的球速。本文从手感和舒适性两个方面考察了超大头部轻量化网球拍的性能。它预测了超大尺寸球拍的质量和质量分布对球员正手平击时球拍手柄和手腕关节冲击冲击振动的影响。该预测基于对球拍特性的识别、球拍-手臂系统的阻尼、运动员手臂系统的等效质量和网球运动中近似的非线性冲击分析。选择了超轻平衡球拍(质量：292 g，重心Lg：距球头末端363 mm)和常规重量和重量平衡球拍(349 g，Lg：323 mm)作为代表。它们是由碳石墨制成的超大尺寸球拍，头部尺寸为120平方英寸，几何形状相同。结果表明，超轻超大型头部平衡球拍的冲击振动比常规重量平衡式球拍大得多。与后者相比，前者在冲击振动方面的甜区从球拍表面的中心向上方移动。这是因为与传统重量球拍相比，第一模式超轻型球拍的球拍手柄上的把手位置距离手柄上节点的位置更远。
The lightweight racket with handle-light configuration and large head size is recent tendency of high-tech tennis rackets, increasing power or post-impact ball velocity with an increasing racket swing speed. This paper investigated the performance of lightweight tennis racket with super-large head size in terms of feel or comfort. It predicted the effect of the mass and mass distribution of super-large sized rackets on the impact shock vibrations of the racket handle and the player's wrist joint when a player hits a flat forehand drive. The prediction is based on the identification of the racket characteristics, the damping of the racket-arm system, equivalent mass of the player's arm system and the approximate nonlinear impact analysis in tennis. A super-light weight balanced racket (mass: 292 g, the center of gravity LG: 363 mm from the butt end) and a conventional weight and weight balanced racket (349 g, LG: 323 mm) are selected as representatives. They are the super-large sized rackets made of carbon graphite with a head size of 120 square inches and the same geometry. The result showed that the shock vibration of the super-light weight balanced racket with super-large sized head is much larger than that of the conventional weight balanced type racket. It also showed that the sweet area of the former in terms of the shock vibration shifts from the center to the topside on the racket face compared to the latter. This is because the location of the grip on the racket handle is further from the location of the node on the handle of the first mode of super-light racket than that of the conventional weight racket.