本研究是分析阻振器對網球拍暫態振動之影響。主要目的是從網球拍受碰撞時,裝 設阻振器對傳遞至拍柄振動響應之影響。並從實驗探討網球拍在真正擊球時,裝設阻振器對傳 至拍柄及手臂之暫態振動響應。研究採用一支Wilson Superlight Power System 5.8SI網球 拍作為實驗對象,分別穿以橫線五十八磅,縱線六十磅之多元酯人工合成網線。實驗時將球拍 鉗鋏於固定平檯上,並使用自由落體的方式,將網球從二公尺的垂直高度降落分別向拍面甜點 及偏離甜點碰撞,實驗分裝設及未裝設阻振器兩種方式進行。研究結果所擷取到網球拍受碰撞 時拍柄之暫態振動響應原始資料,經自然對數衰減(Logarithmic Decrement)方程式,換算出 阻尼比(Damping ratio),同時使用趨穩時間(Settling Time)來分析振幅趨穩的狀況。 從阻尼比的分析顯示網球拍受偏離甜點碰撞時,裝設阻振器與否,對拍柄之暫態振動響應沒有 影響。而當網球拍受正對拍面甜點碰撞時,拍面頂端或邊端加裝任何阻振器似乎沒有明顯的阻 振效果,但是若在拍面柄端加裝阻振器,則可產生明顯的阻振效果。 從趨穩時間分析結果也顯示,當網球向拍面甜點碰撞時,拍柄端加裝方形及線形阻振器的趨穩 時間明顯的小於其他實驗狀況的趨穩時間值,這也顯示網球向拍面甜點碰撞時,拍面柄端加裝 阻振器,會有顯著的阻振效果。

　　　　　Transient response of a tennis racket subject hitting impact was studied experimentally in this paper. The influences of vibration absorber on the transient response was particularly studied. The vibration transmission to the racket handle during striking ball was emphasized. It was shown that the damping ratio reached a maximum when the damper was mounted the racket handle provided the ball struck on the sweet spot. Nevertheless, when the ball struck away from the sweet spot, the damper had no obvious influence on the vibration transmission to the racket handle. Overall, the vibration absorption ability of the vibration absorber became better as it was mounted as closer to the racket handle.