Abstract
Wood, metal, and various composite materials are used in the manufacture of a baseball bat. Aluminum alloy bats are advantageous in terms of improved strength, lower cost, etc. The restitution performance of a hollow aluminum alloy bat is related to the hoop frequency of the bat barrel. In this study, a numerical analysis model of the aluminum alloy bat was created, and the validity of this bat model was investigated via an eigenvalue analysis. Furthermore, the bat-ball coefficient of restitution (BBCOR) was calculated by analyzing the impact between the bat and ball, the relation between BBCOR and hoop frequency was investigated.
