S0506-2-4 超高速ビデオカメラと流れの可視化によるテニスボールのスピン挙動解析と毛羽の役割(スポーツ流体工学(2))

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  • S0506-2-4 Spin Behavior of Tennis balls with and without Felt by using High Speed Video Camera and Flow Visualization

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The previous paper of the authors made clear the mechanism of top spin performance in tennis and its improvement by lubrication of strings according to the high speed video analysis. As the main strings stretch and slide side ways more, the ball is given more spin due to restoring force parallel to the string face when the main strings spring back and the ball is released from the strings. Since the notches of strings decrease spin rate, the lubricant materials are effective to the notched strings. Furthermore, it showed that the more spin results in the reduction of shock vibrations of the wrist joint during impact. The spin rate of newly strung tennis racket without notches is much larger than that of used racket with notches. It also showed the difference of the topspin and the under-spin when a pro and an amateur hits a ball. This paper showed the difference of the spin behavior between tennis ball and smooth surface ball without felt and the mechanism of ball control by using high speed video camera and flow visualization.

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