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Title: 不同材質網球拍的振動及其影響控球能力之分析
The Vibration Analysis of Differential Tennis Racket Materials and Their Relation to Performance Control
Authors: 陳帝佑
Contributors: 體育學系
Keywords: 網球拍;阻尼比;振動;複合材料
racket;damping ratio;vibration;composite material
Date: 1998-06
Issue Date: 2012-05-10T04:12:20Z
Publisher: 國立體育學院
Abstract: 本研究的主要目的在探討不同材質網球拍之振動特性,並藉由振動特性的差異,進一步探討振動對控球能力的影響。實驗中使用五種不同材質的網球拍,分別為100%碳纖維、100%玻璃纖維及碳纖維和玻璃纖維比為7:3、5:5、3:7之網球拍為主要測試的對象,五支網球拍的重量、網壓、勁度、平衡點和拍喉位置前的條件都在相同控制下,進行網球撞擊的振動測試和控球能力測試。振動測試主要是以BioPAC的訊號處理系統和一個Kistler(20g)、一個BioPAC(50g)的加速規進行數據的採集,採樣頻率為2000Hz,網球的撞擊速度均固定為4.09m/s;控球能力測試乃以國內優秀網球選手12名為受試者,持實驗拍和其慣用拍進行正手截擊的落點測試。實驗結果發現100%碳纖維網球拍在中心撞擊、偏心撞擊的處理時,都有較高的阻尼比,和較小的功率譜圖積分值(a=.05)。阻尼比隨著網球拍握柄的玻璃纖維含量的增多而有明顯降低的情形,功率譜圖積分值也顯示振動程度有隨著玻璃纖維的含量增多而加大。此一結果與控球能力的測試結果比較後,推論隨著玻璃纖維的含量增加,持拍手的負荷就會隨之加大,間接的影響運動員的控球能力表現。
The purpose of this study was to analyze the vibration of differentialtennis racket grip materials. Five different kinds of tennis racket grip,their materials were composed by mixing carbon fiber and glass fiber in the ratio of 10 to 0, 7 to 3, 5 to 5, 3 to 7, and 0 to 10, were used in this study. All of them had the same weight, string tension, stiffness and balance. One experiment of the study was to test their vibration and the
other experiment was to distinguish performance control among using the five differ kinds of tennis racket. Two accelerometers (2000 Hz) and BioPAC system were used to acquire the vibrational signals. The impact of the tennis ball was set in the velocity of 4.09 m/s. Twelve elite athletes were served as the subjects to conduct the test of performance control of the forehand volley. The selected variables in the experiments were tested by one-way ANOVA at a=.05 significant level.
The results of this study indicated that the pure carbon fiber maderacket had a higher damping ratio on the center and off-center impact. The damping ratio was significantly decreased as the content of glass fiber in the racket was getting increased. On the other hand, the value of integral power spectrum was significantly increased. composition of tennis rackets, it concluded that by increasing the content of glass fiber in the racket, it would be increasing the load in the tennis player''s arm. Then, indirectly, this phenomenon would affect the athlete''s ability in performance control and this study significantly confirmed this conclusion.
Relation: 碩士; 國立體育學院運動科學研究所
Appears in Collections:[體育學系] 專書

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