219 振動エネルギを考慮したテニスラケットの反発について

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 vibration energy. This paper investigates the relations between coefficient of restitution and each parameters of racket by modal analysis considering the energy ratios of each vibration mode. 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 is big, the striking point must be away from the center of gravity of racket in order to decrease the rotational mode.
2003-06-04