テニスボール反発特性の運動エネルギーによる解析(機械力学,計測,自動制御)

概要

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The dynamics of tennis racket has been investigated by many researchers and the relations between coefficient of restitution and stiffness of racket, the center of rotation of racket, the node of vibration were made clear. But they did not consider the energy of motion and vibration. This paper formulated the method to analyze the energies of ball and racket by the modal analysis. The relation between coefficient of restitution and each parameters of racket considering the energy ratios of each mode of vibration was investigated. The characteristic of restitution can be improved by coinciding the striking point to the node of the bending vibration modes, by increasing the mass of racket and by increasing the stiffness of racket. When the rotating speed of racket before impact increases, the striking point must be moved to the head side of racket in order to decrease the kinetic energy of rotational mode.
2005-02-25