217 テニスラケットの性能予測に基づく軽量化の限界について

元データ 2002-09-13 著者(集計中)

概要

At the current stage, the terms used in describing the performance of a tennis racket are based on the feel of an experienced tester or a player. However, the optimum racket depends on the physical and technical levels of each user. Accordingly, there are a number of unknowns regarding the relationship between the performance estimated by a player and the physical properties of a tennis racket. The lighter racket with head-heavy configuration is recent tendency of high-tech rackets, increasing power with an increasing racket swing speed. Racket frames as light as 200 grams have appeared in the market. This paper has investigated a limit to the weight lightening based on the predicted racket performance in terms of coefficient of restitution, rebound power, racket head velocity and post-impact ball velocity for ground strokes. It is based on the experimental identification of the racket dynamics and the approximate nonlinear impact analysis with a simple forehand swing model. the predicted results showed that the lightest racket at present has advantageous for racket head speed, but disadvantageous for coefficient of restitution, rebound power and post-impact velocity for ground stroke, and it has also large shock vibrations at the racket handle compared to the ordinary super-light weight racket with 275g of frame. Accordingly it was found that there seems to be a limit to the present weight lightening of tennis racket.

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