Performance Prediction of Active Piezo Fiber Rackets in Terms of Tennis Power
スポンサーリンク
概要
- 論文の詳細を見る
Several former top players sent a letter to the International Tennis Federation (ITF) encouraging the governing body to revisit the question of rackets. In the letter, the players wrote that racket technology has led to major changes in how the game is played at the top level. This paper investigated the physical properties of a new type of racket with active piezoelectric fibers appeared recently in the market, and predicted the various factors associated with the frontal impact, such as impact force, contact time, deformation of ball and strings, and also estimated the racket performance such as the coefficient of restitution, the rebound power coefficient, the post-impact ball velocity and the sweet areas relevant to the power in tennis. It is based on the experimental identification of the dynamics of the ball-racket-arm system and the approximate nonlinear impact analysis with a simple swing model. The predicted results with forehand stroke model can explain the difference in mechanism of performance between the new type racket with active piezoelectric fibers and the conventional passive representative rackets. It showed that this new type racket provides higher coefficient of restitution on the whole area of string face and also gives larger rebound power coefficients particularly at the topside and bigger powers on the whole area of string face but the difference was not so large. It seems that the racket-related improvements in play are relatively small and the players themselves continue to improve, accordingly there is a gap between a perception and reality.
著者
-
Kawazoe Yoshihiko
Department Of Mechanical Engineering Saitama Institute Of Technology
-
NAKAGAWA Masamichi
Department of Human-Robotics, Saitama Institute of Technology
-
TAKEDA Yukihiro
Graduate School of Engineering, Saitama Institute of Technology
-
KAWAZOE Yoshihiko
Department of Human-Robotics, Saitama Institute of Technology
関連論文
- Prediction of Impact Shock Vibrations at Tennis Players Wrist Joint: Comparison between Conventional Weight Racket and Light Weight Racket with Super Large Head Size
- The Onset of Cavitation and the Acoustic Noise Characteristics of Sodium Flow in a Venturi
- INVESTIGATION OF A ZIGZAG RISING BUBBLE USING A SPINNING SPHERE MODEL(Multiphase Flow)
- Stability of a Magnetically Levitated Diamagnetic Fluid Column
- Study on the Horizontal Oscillation of Magnetically Levitated Liquid Column
- Chaos-Entropy Analysis and Acquisition of Individuality and Proficiency of a Human Operators Skill Using a Fuzzy Controller
- Chaos-Entropy Analysis and Acquisition of Human Operators Skill Using a Fuzzy Controller: Identification of Individuality during Stabilizing Control of an Inverted Pendulum
- SEPARATION AND WAKE CONTROLS OF A BACK-SPINNING SPHERE BY DIMPLES(Separation and Reattachment)
- Axial oscillation of a magnetically levitated non-magnetic fluid column inside a straight magnetic pipe
- ACQUSITION OF HUMAN OPERATOR'S SKILL FROM TIME SERIES DATA USING FUZZY INFERENCE : IDENTIFICATION OF INDIVIDUALITY DURING STABILIZING CONTROL OF AN INVERTED PENDULUM
- Chaos-Entropy Analysis and Acquisition of Individuality and Proficiency of Human Operators Skill Using a Neural Controller
- Performance Prediction of Active Piezo Fiber Rackets in Terms of Tennis Power
- Low-Speed Hunting of the Pneumatically Governed Compression Ignition Engine : Effects of Various Parameters on the Amplitude and Frequency of Limit Cycle
- Low Speed Hunting of Pneumatically Governed Compression-Ignition Engine : 2nd Report, Stability Criticism of the Closed Engine-Governor Loop Based on Measured Frequency Responses of the Two Open Systems Composing the Loop
- Low Speed Hunting of the Pneumatically Governed Compression-Ignition Engine : 1st Report, Various Experiments for Identifying the Causes
- Analysis of Impact Phenomena in a Tennis Ball-Racket System : Effects of Frame Vibrations and Optimum Rocket Design
- Physics of the Tennis Racket: The Coefficient of Restitution
- Effect of Notched Strings on Tennis Racket Spin Performance: Ultrahigh-Speed Video Analysis of Spin Rate, Contact Time, and Post-Impact Ball Velocity
- Mechanism of Tennis Racket Spin Performance
- Low Speed Hunting of Pneumatically Governed Compression-ignition Engine : 3rd Report, Computer Simulation of the Low Speed Hunting
- Low Speed Hunting of the Pneumatically Governed Compression-ignition Engine : 4th Report, Effect of Simulated Venturi Diameter on Phase Lag of the Fuel Control Rack Response