衝突現象を考慮したテニスラケットのCAE : ストリングス張力と衝突挙動

概要

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There are a number of unclarified points concerning the impact phenomena and the optimum design of tennis rackets. This paper investigates the effect of string tension on the impact phenomena on the basis of a simple impact model where the contact duration is determined by the natural period of a whole system composed of the mass of the ball, the stiffness of ball and strings, and the reduced mass of racket at the impact point on the racket face considering the strong nonlinearity of the resforing force of the ball and strings. It also deals with the effect of string tension on the structural vibration of the racket frame, which is supposed to reduce the coefficient of restitution of the tennis racket due to the energy loss of the frame vibration. The calculated results explain fairly well the experimental results.
1993-02-25