探討網球拍體特性之研究方法的應用

Investigate the Research Methods and Application of Characteristics of the Tennis Racket

目的：隨著運動器材的進步，許多網球製造商皆導入運動生物力學的概念，設計與製造網球相關器材，若能瞭解網球拍體特性的研究方式，則能提供相關廠商或研究人員，作為參考依據。方法：彙整過去探討網球拍體特性之研究方法與需注意要點，並提出具體的場地佈置方位與注意事項。結果：以工業用夾具固定拍體為最穩固與便利，其次為膠帶或白貼綑綁。不論以自由落體或以發球機進行發球，並無特別規定架設的距離，此外球體需精準的撞擊至拍面甜區，或撞擊至同一固定點。高速攝影機需架設於拍體矢狀面處，三軸加速規若黏貼至拍柄時，可黏貼至握把底端向上測量15公分處，或透過選手實際持握拍柄之位置作為黏貼的依據，且需避開夾設工具，將加速規黏貼至夾設工具前。結論：在進行網球拍體特性研究時，透過工業用夾具夾設拍體最為穩固與便利，而為了防止振動傳遞受影響，故夾設時得預留拍柄與工作台空間，長度需相較於加速規長，且可透過地平線作為調整拍體角度的基準，並調整為90度。球體撞擊的距離，可透過同一品牌測速槍，於拍體截面處進行量測，以球體初速度與撞擊前末速度為參考的基準，確定初速度與末速度需在一致的速度下。撞擊的位置可透過紅筆或簽字筆標記，確定能精準的撞擊至拍面甜區或同一固定點，高速攝影機架設於拍體矢狀面處，三軸加速規參考軸向需以拍體水平軸向為基準，比對加速規相同軸向作為分析之依據，藉此提升研究品質。

 

Introduction: With the development of sports equipment, many tennis manufacturers have introduced the idea of sports biomechanics to designing and manufacturing tennis equipment. That can provide the manufacturer or researcher as a reference if understand the research methods of racket characteristics. Method: Integrate the exploring the characteristics of tennis racket research methods and the point and propose the specific layout and precautions. Result: It is most convenient and stablest to fix the racket with industrial clamps, followed by tape or white stickers. Whether served by free fall or a ball machine there is no specified the placed distance deliberate, furthermore, the ball need to accurately hit on the sweet zone or the same point. The high-speed camera needs to be placed on the sagittal plane side of the rackets. If the three-axis acceleration gauge is installed on the handle, it can stick on the 15cm distance from the bottom or by the actual position of the player holding as the basis for pasting, and it needs to avoid the clamp tool and paste in front of the clamp tool. Conclusion: When conducting the research of characteristics of tennis rackets, it is most convenient and stablest to clamp the rackets by using the industrial clamp. In order to prevent the effect of vibration transmission, reserved the space between the handle and the workbench and the length needs to be longer than the accelerometer, then the angle of the rackets can be adjusted according to the horizon and adjust to 90 degrees. The distance of the ball hits can be measured at the cross-section of the rackets through the same brand of the speed gun, the benchmark is based on the initial velocity of the ball and the final velocity before the impact, the initial and final velocity need identical. The position of the impact can be marked by a red pen, to make sure that the ball can impact on the sweet zone or the same fixed point exactly. The high-speed photography frame is located at the sagittal plane of the body, and the three-axis acceleration gauge needs to be based on the horizontal axis of the body, and the same axial direction of the acceleration gauge is used as the basis for analysis, thereby improving the quality of research.