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2005 Fiscal Year Final Research Report Summary

The effect on human body at the impact of tennis racket and balls from the viewpoints of mechanical characteristics of the grip

Research Project

Project/Area Number 16500415
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Sports science
Research InstitutionOita University

Principal Investigator

MAEDA Hiroshi  Oita University, Faculty of Engineering, Professor, 工学部, 教授 (60181591)

Co-Investigator(Kenkyū-buntansha) OKAUCHI Masaaki  Oita University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (20194334)
SHIMADA Yoshio  Oita University, Faculty of Engineering, Professor, 工学部, 教授 (40094065)
Project Period (FY) 2004 – 2005
Keywordstennis racket / grip / impulse / vibration / link model / visco-elasticity model / simulation
Research Abstract

Experiments reveal clearly that when the vibration occurred at the impact of a ball and a racket, there are two kinds of frequency, one is high frequency around 130 Hz and another one is low frequency around 10 to 50 Hz. These results lead us to the conclusion that the racket acts as one is a vibration body and another one is a rigid object at the impact. This high frequency vibration disappeared when a ball impacts only just on the center of racket face, and low frequency remains on the racket. This law frequency vibration transmits to a hand and a forearm though. At the off center impact, when changing the rigidity of the grip from tight to loose, it was found that the high frequency was hard to transmit to a hand, but low frequency passed through the grip. Yoneyama, S. (2003) and other studies reported that the vibration after the impact may causes the "tennis elbow". The results of this experiment reveal that not only the vibration of high frequency but also the low frequency origi … More nates in the tennis elbow, when the racket is regarded as a rigid body.
Findings from the experimental results show that the racket acts as a body with two types of properties, one is a vibration body and another one is a rigid object at the impact. From this point of view, we made a model of impact as a rigid body, and the racket links to a hand through a grip that has the characteristics of visco-elasticity. By means of this model, the characteristics of grip are investigated. The model was identified by comparing the experiment data such as the duration time of contact with the ball and racket, the coefficient of restitution of ball, the characteristics of damping of vibration, the frequency and the peak value of vibration. From the simulation of the model, it is inferred that the coefficient of viscosity of grip changes 1.0 to 5.5 N/m/s and the coefficient of elasticity changes from 50 to 500 N/m, according to the tightness of grip. As the tightness of the grip changes, the visco-elasticity coefficients of wrist joint are also influenced. Less

  • Research Products

    (4 results)

All 2005

All Journal Article (4 results)

  • [Journal Article] テニスにおけるグリップの粘弾性特性2005

    • Author(s)
      前田 寛
    • Journal Title

      トレーニングを科学するバイオメカニクス 第18回大会論集

      Pages: 186-187

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] テニスラケットにおける低周波衝撃の振動伝播2005

    • Author(s)
      前田 寛
    • Journal Title

      日本体育学会第56回大会予稿集

      Pages: 260

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Mechanical Characteristics of Tennis Grip2005

    • Author(s)
      Hiroshi Maeda
    • Journal Title

      Proceedings of 18^<th> Symposium of Japanese Biomechanics Society

      Pages: 186-187

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] The transmission of low frequencies vibration from tennis racket to hand2005

    • Author(s)
      Hiroshi Maeda
    • Journal Title

      Proceedings of 56^<th> Symposium of Japan Society of Physical Education, Health and Sport Science 260

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2007-12-13  

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