Motion of Triple Pendulum with Two Active Joints (Mechanisms of the Kip Motion)

Abstract

The purpose of this study is to clarify the mechanisms of the kip motion, or the upstart, which is a technique of the horizontal bar exercise. The player's motion was experimentally analyzed using a movie camera. Under the assumption that the player who performs the kip is considered to be a triple pendulum, the equations of the kip motion were derived and computer simulation was performed with various parameters. Furthermore, the kip motion of the triple pendulum with two active joints was executed and measured. It was concluded that successive motion in the kip can be divided into three phases, i. e., the swing phase, the kick phase and the stop phase. In the kick phase, which is the most important, two exact physical conditions must be satisfied, that is, certain timing of the kick and a certain attitude at the peak kicking moment are necessary.