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Title: The Effect on Coefficient of Restitution and Vibratory Conduction of Tennis Racket Arranged in One-piece Molded and Pu-foam Handles
Authors: Chen, T. Y.;Chen, C. Y.;Chiang, Jinn-Yen
Contributors: 體育學系
Date: 2006
Issue Date: 2012-12-10T02:47:27Z
Publisher: Elsevier
Abstract: Tennis racket material composition and structure might affect the racket feature when impact. This study
aimed at analyzing the characters of tennis racket which were varied with one-piece molded and pu-foam
handles. This study was also to investigate how the vibratory conduction on racket handles and coefficient
of restitution of the ball from each racket were affected by the vibration of the racket. There were ten
different kinds of tennis racket, composed by mixing carbon fiber and glass fiber in the ratio of 1 to 0, 3 to
1, 1 to 1, 1 to 3 and 0 to 1. The structure of the racket handles were arranged in one-piece molded handle
and pu-foam handle. The rackets had the same weight, string tension and balance. In this study, one
experiment was to monitor the vibration in the grip of every tennis rackets. Three accelerometers (500 G)
and BioPAC system were attached to each racket to acquire the vibratory signals, and the sample rate
was 2000 Hz. The other experiment was to distinguish the coefficient of restitution between the ball and
everyone of ten different rackets. The impact of the tennis ball was set in the velocity of 28 m/s or so. SIMI
Analysis System with one high-speed video camera (1000 Hz) was used to record the kinematics data
and to calculate the coefficient of restitution between the ball and racket. The results of this study
indicated that the racket arranged in pu-foam handles had high value of vibratory damping ratio. On the
other hand, however, the racket arranged in one-piece molded had high value of coefficient of restitution.
Relation: Journal of Biomechanics, 39(1): S196
Appears in Collections:[pe] Periodical Articles

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