DYNAMIC ANALYSIS OF THE EFFECT OF CENTRIFUGAL AND CORlOLlS FORCES IN SWINGING A BAT

  • Y. Mochizuki
  • T. Matsuo
  • S. Inokuchi
  • K. Omura
Keywords: computer simulation, mathematical model, inertial force, optimisation

Abstract

This paper reports a dynamic analysis by computer simulation of bat swinging, taking into account inertial forces at the wrist joint, and which consist of centrifugal and Coriolis forces generated from a body turn and internal rotation of the upper limbs. The ideal bat swing generated by optimisation using a mathematical model is also described. Based on the dynamic analysis, it is shown that the inertial forces play an important role in the process of flexion and extension between a bat and the upper limbs during a bat swing, and that the effects of gravity on a bat is much smaller than those from inertial forces. It was also proven from the optimisation that an ideal bat swing, a swing using minimal torque at the wrist, exists.
Section
Coaching and Sports Activities