フレーム・ストリング・一体化構造テニスラケットの手に伝わる衝撃振動特性の予測と評価(テニス(2))

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  • Prediction and Estimation of Shock Vibrations of Handled Tennis Rackets with Clamped Strings Compared to those with Wheels on the Sides
  • フレーム・ストリング・一体化構造テニスラケットの手に伝わる衝撃振動特性の予測と評価
  • フレーム ストリング イッタイカ コウゾウ テニス ラケット ノ テ ニ ツタワル ショウゲキ シンドウ トクセイ ノ ヨソク ト ヒョウカ

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The lightweight 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. However, the predicted results showed that the lightest racket at present in the market 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. This means a limit to the weight lightening of tennis racket from the viewpoint of performance. The engineers and racket designers at the racket companies seem to be under intense pressure to keep pumping out new and better technologies every year. This paper investigated the physical properties of new type of rackets appeared in the market with wheels or with clamped strings by contraries replacing conventional grommets on the sides, predicting racket performance in terms of the impact shock vibrations of player's wrist joint, which might be related to the feel. It is based on the experimental identification of the racket-arm dynamics and the simple nonlinear impact analysis. The result showed that the shock vibrations at the handle and the wrist joint using the racket with clamped strings are larger than those using the racket with wheels, though the racket with clamped strings provides higher coefficient of restitution around the center of strings face than the racket with wheels on the sides.

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