| abstract |
(57) [Summary] [Problem] To suppress as much as possible the entire vibration of a racket and effectively suppress the shock and vibration transmitted to the player's hand. [Solution] Attenuation of out-of-plane primary natural frequency of racket The ratio is set in the range of 0.016 or more and less than 0.0035, The damping ratio of the out-of-plane secondary natural frequency is 0.008 or more, 0.0 Set to a range less than 16. |