野球バットの「振り易さ」に関わる慣性モーメントについて

概要

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Each baseball bat has its own characteristics regarding 'easiness' (or 'difficulty') in swinging. To determine the variety (distribution) and effect of the grip-point, the present study investigated the 'easiness' of swing by measuring the physically defined moment of inertia (MI). For this purpose, eighteen randomly selected bats were examined. MI was measured by the pendulum method, since the bat shape is like a complicated cylinder. The mean MI and S. D. was 0.323±0.014kg・m^2. In addition, MI_i (MI at eight randomly selected grip positions) was also determined MI_i values decreased curvilinearly in association with increasing grip positions apart from the grip-end, e.g., decreasing to 72.0% at 0.1m, and 59.5% at 0.15m. We also found that MI was highly correlated (p<0.001) with the index calculated as the weight of bat times its length, suggesting that MI of the baseball bat can be roughly estimated by multiplying its weight and length.
大阪体育大学の論文