Abstract
The game of tennis is plagued with wrist and elbow injuries. Most players use light, stiff hollow graphite rackets. A recent foam-filled racket design appears to reduce the risk of wrist injury. A vibrational analysis of a wide variety of rackets was conducted in attempt to understand the science behind this racket’s apparent success. Damping rates were measured for the bending and torsional modes for a wide variety of hollow and foam-filled rackets. No significant difference among the rackets was found, suggesting the benefit of the foam-filled racket design is not due to damping. An extensive modal analysis was conducted for several rackets over the frequency range of 100 Hz to 1.5 kHz to identify the bending, torsional, and string modes. In this paper, the damping rates, mode shapes, and frequencies, will be compared for several hollow and foam-filled rackets. Results will be interpreted in light of the relevant forces between the racket, ball, and arm.
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