網球拍拍柄材質之振動阻尼比研究

The purpose of the study was to analyze the vibration of differential tennis racket grip materials. Five different kinds of tennis racket grip, their materials were composed by mixing carbon fiber and glass fiber in the ratio of 10 to 0, 7 to 3, 5 to 5, 3 to 7, and 0 to 10, were used in this study. All of them had the same weight, string tension, stiffness and balance. The experiments of the study were to test their vibration and to find damping ratio. Two accelerometers (2000 Hz) and BioPAC system were used to acquire the vibrational signals. The impact of tennis ball was set in the velocity of 4.09 m/s. The selected variables in the experiments were tested by one-way ANOVA at=.05 significant level. The results of this study indicated that the pure carbon racket made racket had a higher damping ratio on the center and off-center impact. The damping ratio was significant decreased as the content of glass fiber in the racket was getting increased. Therefore, base on the vibrational analysis among the differential material composition of tennis rackets, it concluded that by increasing the content of glass fiber in the racket, it would be increasing the load in the tennis player's arm. Then, indirectly, this phenomenon might affect the athlete's performance.