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Abstract
The most common commercial pitching machines for baseball are the "roller" type and also the "arm" type. The pitching, such as the fast, curve and sinking ball, is easily achieved by the roller type. In this study, a moving behavior and a contact stress state of the pitched ball with the roller type pitching machine is analyzed using the dynamic FEM analysis software (ANSYS/LS-DYNA). In addition, the initial velocity and the spin of the pitched ball are filmed using a high-speed videography, and those pictures compared with the FEM analysis. Furthermore, a model of the ball with a seam is analyzed, and those influence is considered.
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