網球拍電子阻振系統之運動生物力學特性分析

Analysis on Characteristics of Sport Biomechanics in Electronic Damping System of Tennis Racket

10.6569/NTUJPE.200803_(12).0002

麥吉誠(Jyi-Cherng Mai)

網球拍 ； 電子阻振 ； 生物力學 ； Tennis Racket ； Electronic Damping ； Sport Biomechanics

臺大體育學報

12輯（2008 / 03 / 01）

21 - 43

繁體中文

本研究主要的目的是分析電子阻振系統網球拍的特性，研究先架構網球拍之有限元素模型進行分析，並藉由其模態分析求取模態參數，包括自然頻率、振型及阻尼比，再進行簡諧分析以求取頻率響應函數；其次進行實驗模態分析求取網球拍之模態參數及頻率響應函數。研究經由理論驗證及實驗研究法，理論驗證使用Ansys模態分析進行分析，實驗研究則應用衝擊實驗透過ME'''' scope VES 5.0TM進行實驗分析。研究結果發現如下：電子阻振系統網球拍振動特性與一般鈦金網球拍振動特性比較，不論理論值，抑或是實驗值，電子阻振系統網球拍包括自然振動頻率、阻尼比皆稍高於一般鈦金網球拍，而結構振型兩者並無太大差異。電子阻振系統網球拍之甜區(sweet spots)與一般鈦金網球拍並無太大的差異。一般鈦金網球拍之握把振動能量實驗值稍高於電子阻振網球拍之握把振動能量實驗值，這表示手部所承受的振動力量一般鈦金網球拍高於電子阻振網球拍，亦即電子阻振網球拍有較佳的阻振能力。

This study was designed to analyze the characteristics of the tennis racket with electronic damping system. Firstly, the study developed and analyzed the finite element models of the tennis racket and, through the model analysises, calculated the model parameters such as natural frequencies, vibration types, and damping ratios, and then carried out the simple harmonic analysises to obtain a frequency response functions; after that, the experimental model analysises were implemented to calculate both model parameters and frequency response functions of the tennis racket. The study was conducted by way of theoretical verification and experimental research, among which the former used the Ansys modal analysis while the latter applied the impact tests through ME'scope VES 5.0(superscript TM). The study findings were as follows: 1. The vibration characteristics of the tennis racket with electronic damping system, including natural vibration frequency and damping ratio, with regard to either theoretical or experimental values, are slightly higher than those of a common titanium tennis racket. And there is no significant difference between the two kinds of rackets with regard to the structural vibration types. 2. There are few differences between the sweet spots of the tennis racket with electronic damping system and that of a common titanium tennis racket. 3. The experimental value of the vibration energy concerning the handle of a common titanium tennis racket is slightly higher than that of the tennis racket with electronic damping system, suggesting that a common titanium tennis racket has stronger vibration power on the hand than the tennis racket with electronic damping system does; namely, the latter has better damping performance.

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