23H 40mm 卓球ボールの打撃特性

概要

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The International rules of table tennis was changed by ITTF (The International Table Tennis Federation). As to balls, the diameter was enlarged 38mm to 40mm, and the weight was increased 2.5g to 2.7g. The purpose of this study was to detect the differences in hitting properties for the two specification balls, in order to make skill up training and develop the high performance goods. The differences of averaged ball velocity between two balls was measured by rally and serve play with a few skilled players, and the reduction ratio of ball velocities, initial hitng velocities, ball spins, hitting angles were analyzed by using ball shot machine, golf swing robot, velocity measuremental sensor system and high-speed video camera. The following results were obtained; (1) The averaged ball velocity of 40mm diameter ball was smaller than that of 38mm ball about 2-4% by measurement of times in practical rally and serve play. (2) The differences of velocity reduction ratio between two balls could not be detected. (3) In case of hitting the balls by table tennis racket using the golf swing robot under same condition such as racket velocity and racket surface angles, then, the initial velocity of 40mm ball was smaller slightly 1-2%, and the ball spins was smaller 5-20% than that of 38mm ball.
2000-11-08