臺灣博碩士論文加值系統

網球拍纖維材質與排列角度對擊球反應之分析
研 究 生：陳帝佑
指 導 教 授：林德嘉 博士
共同指導教授：劉 宇 博士
中文摘要
本研究的主要目的在探討不同網球拍纖維材質與排列角度之振動特徵，並藉由實際握拍方式分析手腕部位所受振動的影響，與反彈球速的差異。實驗中採用八種網球拍，其碳纖維和玻璃纖維比分別為1：0、6：1、5：2和4：3，並分別搭配纖維角度22度和30度之網球拍為主要測試的對象，每支網球拍的重量、網線張力和平衡點皆控制在相同的條件下，進行網球撞擊的測試。振動測試是以Biovision的訊號處理系統和一個Biovision（50g）、一個BioPAC（500g）的加速規進行數據的採集，採樣頻率為10000Hz，網球的撞擊速度約為28m/s；反彈球速比是以高速攝影機收集每次撞擊過程的運動學資料，拍攝頻率為1000Hz。研究結果發現，球和球拍的撞擊過程中，球拍纖維角度30度時之振幅較22度小，且網球拍含碳纖維比例越多，球拍結構體之最大振幅值越小，因此在撞擊過程中球拍損耗較少之力學能，所以有較大的反彈球速比；然而球拍含碳纖維比例越多，對於持拍手腕卻有較大之振幅反應，且手腕測得之對數衰減率亦較大，這反映出手腕承受大部分振動波的能量，因而增加了持拍手臂的負荷，故長時間使用將造成運動員之疲勞反應提早發生。
關鍵詞：網球拍、纖維材質、纖維角度、振動

The Impact Analysis of Tennis Rackets Varied with
Material Composition and Fiber Arrangement
Doctoral Graduate Student: Chen, Ti-Yu
Advisor: Lin, Der-Chia Ph. D.
Co-Advisor: Liu, Yu Ph. D.
ABSTRACT
This study aimed at analyzing the vibration of various tennis rackets, which were composed by the mixture of carbon fiber and glass fiber. This study was also to investigate how the wrist joint of the player and rebounding velocity of the ball from each racket were affected by the vibration of the racket. There were eight different kinds of tennis racket, composed by mixing carbon fiber and glass fiber in the ratio of 1 to 0, 6 to 1, 5 to 2, and 4 to 3. The angles of the fiber were arranged in 22 degrees and 30 degrees with respect to the longitudinal axis. The rackets had the same weight, string tension and balance. In this study, one experiment was to monitor the vibration in the grip of every tennis racket and in the wrist joint of participant. The other experiment was to distinguish the coefficient of restitution between the ball and everyone of eight different rackets.
Two accelerometers (1000 Hz) and Biovision system were attached to each racket to acquire the vibratory signals. The impact of the tennis ball was set in the velocity of 28 m/s or so. Peak Motus system with one high-speed video camera (1000 Hz) was used to record the kinematics data and to calculate the coefficient of restitution between the ball and racket. The selected variables in the experiments were tested by two-way ANOVA at a=.05 significant level.
The results of this study indicated that the racket had lower value of max vibratory amplitude for fiber angle at 30 degrees than at 22 degrees. The value of max amplitude on tennis racket grip was significantly decreasing as the content of carbon fiber in the racket was increasing. Therefore, more the component of carbon fiber, the tennis racket would lost less mechanical energy, and had higher coefficient of restitution between the ball and racket. One the other hand, however, the amplitude and the ratio of logarithmic decrement were significantly increasing on the wrist joint as the content of carbon fiber in the racket was increasing. Consequently, this phenomenon indicated that the wrist joint would absorb more vibratory energy from racket made by pure carbon fiber. Thereby, the player would bear extra load in the arm and affect his/her performance in long term consideration.
Key words: racket, material, fiber angle, vibration

目 次
中文摘要..........................................................................I
英文摘要.........................................................................II
謝誌................................................................................III
目次................................................................................IV
圖次..............................................................................VII
表次.............................................................................VIII
第壹章 緒論.......................................................................1
第一節、前言......................................................................1
第二節、問題背景.........................................................…………....2
第三節、研究目的.............................................................…………6
第四節、研究範圍與限制...................................................………..7
第五節、名詞解釋與操作性定義........................................……….9
第貳章 文獻探討..............................................................………..11
第一節、網球拍支撐點的作用對擊球效果之探討………..…….11
第二節、網球拍結構體之物性對擊球反應的研究………..…….14
第三節、網球拍振動反應影響運動表現之探討…………..…….17
第四節、結語...............................………........................…………21
第參章 研究方法與步驟...............................................……….23
第一節、研究對象..........................................................…………23
第二節、實驗儀器與設備................................................………..24
第三節、實驗時間與地點................................................………..25
第四節、實驗步驟.................................................…………..........26
第五節、對數衰減方程之理論基礎......................……………….30
第六節、資料處理.............................................................………..37
第肆章 結果與討論……………………...…….... ………..…….39
第一節、不同材質網球拍的振動特性分析................………..…39
第二節、不同材質網球拍造成持拍手腕關節的振動反應..........51
第三節、不同材質網球拍對反彈球速比的影響………………..62
第四節、綜合討論................................................…………..........69
第伍章 結論與建議…………………………….……………..…74
引用文獻..................................................................…………............77
一、中文部份..................................................................…………77
二、外文部份..................................................................…………78
附錄一：纖維角度22度搭配57％碳纖維球拍之撞擊測試資料….....83
附錄二：纖維角度22度搭配71％碳纖維球拍之撞擊測試資料….....84
附錄三：纖維角度22度搭配86％碳纖維球拍之撞擊測試資料…….85
附錄四：纖維角度22度搭配100％碳纖維球拍之撞擊測試資料......86
附錄五：纖維角度30度搭配57％碳纖維球拍之撞擊測試資料…....87
附錄六：纖維角度30度搭配71％碳纖維球拍之撞擊測試資料…....88
附錄七：纖維角度30度搭配86％碳纖維球拍之撞擊測試資料…....89
附錄八：纖維角度30度搭配100％碳纖維球拍之撞擊測試資料…..90

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