Effect of Notched Strings on Tennis Racket Spin Performance: Ultrahigh-Speed Video Analysis of Spin Rate, Contact Time, and Post-Impact Ball Velocity
スポンサーリンク
概要
- 論文の詳細を見る
While some tennis racket strings have more grip than others do, this does not guarantee that they will impart more spin to a tennis ball. Experiments with hand-held rackets are required to determine the longstanding question of how players can discern that different strings behave differently when laboratory tests indicate that they should play the same. In a previous study, we clarified the top-spin mechanism of a tennis racket by using high-speed video analysis on a tennis court for the first time. Furthermore, we improved it by using lubricated notched nylon strings. These experiments revealed that the more the main strings stretch and bend laterally, the more spin is imparted to the ball. This is due to the restoring force being parallel to the string face when the main strings spring back and the ball is released from the strings. Notched strings reduce the spin rate, but this can be effectively counteracted by employing lubricants. Furthermore, we found that imparting more spin reduces shock vibrations on the wrist during impact. The present study revealed that a ball has a 40% lower spin rate when hit with a racket with notched strings than with one with unnotched strings in the case of nylon (it had to be determined whether new strings or lubricated used strings give more spin). The experiments also showed that 30% more spin is imparted to a ball when the string intersections are lubricated by oil than when notched used nylon strings are used. Furthermore, we found that used natural gut notched strings reduced the spin rate by 70% compared to when new natural gut unnotched strings are used. We also investigated different top-spin behaviors obtained when professional and amateur tennis players hit a ball.
著者
-
Takeda Yukihiro
Department Of Neurosurgery National Hospital Organization Yokohama Medical Center
-
Kawazoe Yoshihiko
Department Of Mechanical Engineering Saitama Institute Of Technology
-
NAKAGAWA Masamichi
Department of Human-Robotics, Saitama Institute of Technology
-
NAKAGAWA Masamichi
Department of Mechanical 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
- Endodermal Cyst Ventral to the Lower Brain Stem : Case Report
- 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