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Anti-vibration effects in tennis rackets with some gum pieces are analyzed by numerical simulations using the finite difference method. The simulated results of the string vibrations show the existence of wave propagations parallel to the two-dimensional rectangle boundaries. These results are confirmed with the experimental data of the sound specter analysis in good agreements. The anti-vibration effects of dampers are measured with changing the gum piece weights using an acceleration sensor and microphones. These fitted weights are investigated for general tennis racket at 55~60 pound tensions. The string sound damping is precisely investigated using these results. The gum piece structures are discussed for searching the efficient anti-vibration effects. It is found that popular gum pieces have fairly good ability of the damping effects.

Anti-vibration effects with a gum piece in tennis rackets (Analysis by the finite difference method)