20719 A research on vibration and performance of bat for baseball

It is a research on a metallic bat for baseball. There is the point which is called a sweet spot. At the point, a ball in repulsed most in the bat. The definition of a sweet spot is indefinite. The reason why a sweet spot is approved is researched. First of all, The first node, the 2nd node, and the center of impact were measured. Next. The ball was made to collide with them and the repulsion coefficients were measured, and compared