テニスラケットのスピン性能におよぼすガット・ノッチの影響 : スピン量・接触時間・打球速度の超高速ビデオ画像解析(機械力学,計測,自動制御)

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  • Effect of String Notches on Tennis Racket Spin Performance : Ball Spin Rate, Contact Time and Post-Impact Ball Velocity with Ultra-High-Speed Video Analysis(Mechanical Systems)
  • テニスラケットのスピン性能におよぼすガット・ノッチの影響(スピン量・接触時間・打球速度の超高速ビデオ画像解析)
  • テニスラケット ノ スピン セイノウ ニ オヨボス ガット ノッチ ノ エイキョウ スピンリョウ セッショク ジカン ダキュウ ソクド ノ チョウコウソク ビデオ ガゾウ カイセキ

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There has been no question that some strings do provide a better grip than others, but that did not guarantee that the ball will produce more spin. Furthermore, experiments with hand-held rackets has been needed to solve the vexed question of how players can tell the difference between different strings when laboratory tests indicate that they should play the same. The previous paper of the authors made clear the mechanism of top spin performance in actual tennis and its improvement by lubrication of notched nylon strings according to the high speed video analysis on the court for the first time. It succeeded in an experiment showing that 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. This paper showed that the ball is given less spin rate (40% decrease) with the notched used strings compared to that with the new strings in the case of the nylon in this experiment, which has remained to be seen which gives more spin between new strings and the lubricated used strings, and it showed that the ball is given more extra spin (30% increase) by oil lubrication at the string intersections compared to that with the notched used nylon strings. Furthermore, it also showed that the used natural gut with notches decrease 70% of spin rate compared to the new natural gut without notches in the another experiment, which has remained to be seen whether the same results will be obtained. It also showed the difference of the topspin behavior when a pro and an amateur hits a ball.

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