A18 軟式野球バット打撃部のトランポリン効果(野球1)

概要

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An existence of soft stiffness in an impacting instrument (e.g. tennis racket, golf club, baseball bat, etc.) increases the COR for the collision with a ball. This phenomenon is well known as a trampoline effect in which the higher COR is obtained because of the reduction of the ball deformation due to the compression of the soft spring. In a rubber baseball bat, it is useful to attach a soft material sheet covered with a barrel for an effective usage of the trampoline effect. In the present paper, the effect of soft material sheet on COR is investigated by using the finite element impact analysis. It is found that the existence of the soft material increases the COR but enlarges the deformation of the ball during the impact, the restitution of the soft material begins at the early stage of the impact and a thick sheet which has the low values of Young's modulus is effective to increase the COR.
2008-11-05