2002 Fiscal Year Final Research Report Summary
Mechanism of shock vibrations at the wrist joint during tennis impact
| Project/Area Number |
13650257
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Dynamics/Control
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| Research Institution | Saitama Institute of Technology |
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Principal Investigator |
KAWAZOE Yoshihiko Saitama Institute of Technology, Engineering, Professor (00102898)
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| Co-Investigator(Kenkyū-buntansha) |
KANAYA Keiji Saitama Inst. Tech., Engineering, Professor (90161166)
TOMOSIUE Ryoso Yasuda Women's College, Human Science, Professor (50320031)
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| Project Period (FY) |
2001 – 2002
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| Keywords | Tennis / Sports Engineering / Tennis Racket / Impact / Restitution Coefficient / Shock Vibrations / Feel / Tennis Elbow |
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| Research Abstract |
The terms used in describing the performance of a tennis racket are based on the feel of an experienced tester or player. However, the optimum racket depends on the physical and technical levels of each user. Accordingly, there are a number of unclear points regarding the relationship between the performance estimated by a player and the physical properties of a tennis racket. This research investigates the mechanism of racket performance in terms of the feel or comfort of the arm or hand in an impact. It predicts the shock vibrations of the wrist joint caused by the impact when a male tournament player hits flat forehand drive. The analysis is based on the identification of the racket characteristics, the damping of the racket-arm system, the equivalent mass of the player's arm system and the approximate nonlinear analysis of the impact in tennis. The predicted waveform of shock vibrations of the player's wrist joint agrees fairly well with the measured one. This research could also estimate the feel or comfort of the rackets with different specifications and physical properties.
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