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Subject Keyword Abstract Author
 
 
Effects of string tension and impact location on tennis playing

Linlin Li/Seung Han Yang/Chang-Soon Hwang/Young Suk Kim
The Journal of Mechanical Science and Technology, vol. 23, no. 11, pp.2990-2997, 2009

Abstract : Finite element impact simulations were performed to observe the vibration of a tennis racket and its strings, as well as the effects of string tension and impact location on a player¡¯s hand and his chances of getting an injury. Studies using the finite element method [FEM] revealed that decreasing the string tension lowers the coefficient of restitution. The ratio of speed to angle change increases with a decrease in string tension. Moreover, the resultant force on the player¡¯s hand is stronger if the tennis ball hits the dead spot than if it hits the sweet spot. For instance, as a tennis ball hits the dead spot with a speed of 10.05m/s, an angle of 15¡Æ, and a string tension of 222N, the player¡¯s hand feels a maximum resultant force of almost 424N, which is 1.61 times higher than if the ball hits the sweet spot, at t=0.081 and t=0.0149. Moreover, the force exerted on the player's hand if the ball hits either the best-bounce spot or the off-center spot is 1.4 times higher than if the ball hits the sweet spot.

Keyword : Tennis racket; Finite element analysis; Vibration; String tension; Resultant force

 
 
 
 
 
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