The Effect of Damper on Tennis Racket Handle Impact Force after Ball Impaction
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Abstract
Objective: To compare the peak force and vibration at tennis racket grip between different dampers and different tennis ball impact locations.
Methods: The peak force and vibration was measured at tennis rackets grips between 4 different damping conditions which were no damper, button damper, rubber band damper and worm damper. Tennis balls were served using a tennis strike-simulating machine with speed 32m/s. The peak force were recorded from a wireless force transducer attached to the grip during four locations on string bed: center, above center, below center, and off-axis. Vibration was calculated form time domian using Fourier transform.
Results: At a below center impact location, the button damper yielded a 10% reduction in some harmonic of the racket’s vibration from 191.7 ± 2.6 Hz to 172.9 ± 2.8 Hz (p =0.001), the rubber band damper yielded a 8% reduction from 191.7 ± 2.6 Hz to 176.8 ± 4.4 Hz (p = 0.005), whereas the worm damper yielded a 7% reduction from 191.7 ± 2.6 Hz to 178.8 ± 3.8 Hz (p = 0.011). No significant effect of damper types on the vibration with the others impacts location. These dampers did not reduce the impact force at the grip regardless of the location.
Conclusion: Damper reduced the racket’s vibration when the ball impacts a below center position.
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References
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