A-12 スポーツ用ボールの剛体壁面への斜め衝突における初期スピンの影響(テニス・バドミントン1)

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  • A-12 The Effects of Inbound Spin on Oblique Collision of Sports Ball with Rigid Flat Surface
  • スポーツ用ボールの剛体壁面への斜め衝突における初期スピンの影響
  • スポーツヨウ ボール ノ ゴウタイ ヘキメン エ ノ ナナメ ショウトツ ニ オケル ショキ スピン ノ エイキョウ

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Although the role of a spin is very important for an impact of a hollow spherical sports ball, an understanding of collision characteristics of the ball is extremely difficult because of its large deformation. We consider that the best tool for a study of the hollow ball impact is a finite element analysis. Concerning a tennis ball and a table tennis ball, after the finite element analysis whose program was developed by the author has been validated against experimental results, the effects of inbound spins on rebound velocity, spin and angle are investigated. The following are found for the hollow ball normal and oblique impacts. For the tennis ball, the tangential component of the velocity is widely reduced due to the frictional force, the spin is largely reduced due to the normal component of the impact force and the wide inbound angle produces a considerable amount of the spin. For the table tennis ball, the rebound velocity decreases as the inbound velocity increases in the inbound normal velocity range of over 18 m/s.

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