80070244

open access

Version of Record

バット ノ カンセイ モーメント ト リキガクテキ トクセイ

Inertia Moment and Dynamic Characteristics of Baseball Bats

Japanese (日本語)

神戸大学医療技術短期大学部紀要

9

131-139

神戸大学医療技術短期大学部

1993

2007-11-21

Inertia moment of baseball bats was measured by the physical pendulum method (i.e. oscilator). Nine bats (four alminum baseball bats and five wooden baseball ones) were used in the experiment. The result of this experiment showed that: 1) The average of inertia moment of alminum baseball bats was 6.088×10-2 kg• m2 , while that of wooden baseball ones was 4.520×10-2 kg• m2 ; 2) it became obvious that inertia moment of a bat is influenced by the distribution of mass; 3) the distribution of mass of a wooden baseball bat is concentrated in the center of gravity, while the distribution of mass of an alminum baseball bat is dispersed, separated from the center of gravity; 4) the center of gravity of a wooden baseball bat is situated near the bat head (35.7% distant from the distal end of the bat), while the center of gravity of an alminum baseball bat is 40.2% distant from the distal end of the bat; 5) the center of percussion of an alminum baseball bat is dispersed over a wide range of a bat, compared with that of a wooden baseball one.

紀要論文