A23 ローラ式ピッチングマシンにおけるボール縫い目の影響(野球2・他)

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タイトル別名
  • A23 An Effect of a Baseball having Seam under Roller type Pitching Machine
  • ローラ式ピッチングマシンにおけるボール縫い目の影響
  • ローラシキ ピッチング マシン ニ オケル ボール ヌイメ ノ エイキョウ

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A pitching machine of roller type for baseball achieves easily variable balls. On an official hard-baseball, having a seam, it is observed to affect variations in the ball's spin revolutions and the projected angle. In this study, a dynamic behavior and a contact stress state of the pitched ball with the baseball machine of roller type is analyzed using the commercial dynamic finite element code (ANSYS/LS-DYNA). In addition, their analysis results (provided the ball's speed and spin revolutions) were given as an initial condition, and the drag and lift force of a ball were analyzed by the computational fluid dynamics software (ANSYS/CFX). From these results, the trajectory of the ball for each posture was calculated. An effect of the throw accuracy by the ball with a seam was considered.

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