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鈦合金網球拍振動響應及回復係數分析

The Vibration Response and Coefficient of Restitution Analysis of Titanium Alloys Tennis Rackets

摘要


本研究目的是探討鈦合金網球拍動力學振動響應及回復係數。研究以Head Ti Radical、Yonex Ultimum Ti 50網球拍爲研究對象。每支球拍皆穿以P&F牌之Fiber Tech網球線,直線及橫線之張力皆爲50磅,並以衝擊實驗法加以實驗。實驗時使用網球唧吸器吸住衝擊球於100公分高度,以自由落體的方式碰撞鉗夾於測力板上的網球拍,同時,應用運動生物力學分析軟體,蒐集及紀錄每支球拍各十次之碰撞實驗資料,並應用高速攝影機紀錄衝擊球之反彈高度。實驗所得資料使用頻譜分析及影片分析整理。 實驗研究結果發現: 一、以振動響應來看,Yonex Ultimum Ti 50鈦合金網球拍在振動響應上明顯小於Head Ti Radical鈦合金網球拍。 二、以反彈之回復係數來看,Yonex Ultimum Ti 50網球拍反彈之回復係數高於Head Ti Radical網球拍。

並列摘要


This study was to analysis the dynamic characteristic of the Titanium Alloys tennis rackets through the impact experiments. The two various rackets Head Ti Radical and Yonex Ultimum Ti 50 were strung with Fiber Tech style string that the string tension was 50 pounds. The vacuum was used to drop an impact ball from a distance of one meter at centric location of racket. The vibration responses and coefficients of restitution of the two rackets impacted by impact ball was studied via impact experiments. The data were not only recorded through force transducer of Kistler Force plate and Bioware but also used spectrum analysis. The experimental results show that 1. In the view of the responses of vibration The Yonex Ultimum Ti 50 has the shorter vibration response. 2. In the view of the coefficient of restitution The Yonex Ultimum Ti 50 has higher coefficient of restitution.

參考文獻


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