A14 三ローラ式ピッチングマシンの投球性能に関する研究(野球1)

概要

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Pitching machine with three rollers for baseball can pitch balls at various speeds and pitch types that are developed by the authors. In this study, the influence that a hard-baseball with a seam has on the throw accuracy of the pitching machine with rollers is examined. Finite element models of a hard-baseball with a seam and the pitching machine with three rollers are made, and throw simulations are proceeded with consideration of the seam using dynamic finite element analysis software (ANSYS/ LS-DYNA). As for the analytical results, it is found that the seam of the ball does not influence the ball's speed or spin rate after release, while there is an effect of the seam on the throw's vertical and horizontal angles. In particular, the throw's vertical and horizontal angles easily produce a change if the roller diameter is narrow and the roller material, hard. Additionally, these analytical results are inspected by the throw experiments using the pitching machine.
社団法人日本機械学会の論文
2008-11-05