３自由度投射モデルによる砲丸投げ投法の特徴付け

概要

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As a model for putting a shot, we employ a release model with three degrees of freedom which model includes three parameters: a shot putting speed, a release angle and a horizontal speed of the shot putters body. The three DOF model provides the explicit solution of the optimum release angle with the model parameters, and the solution is used for estimating the value of the model parameters from measured data. Under the assumption that shot putters release a shot at their optimum angles, the speeds of putting a shot and the body are estimated. The result shows the distinct negative correlation between these speeds. Also, we attempt to clarify the difference between the glide and rotational techniques which are popular throwing techniques in shot put. It is found that the distribution of the body speed and the optimum putting angle depend on the throwing techniques, and this result suggests that the three DOF release model explains the difference between the throwing techniques from the standpoint in mechanics.