Study on fluctuation in the spectrums of torque data during golf swing due to the changes of golf club characteristics

Abstract

In playing the golf, using suitable golf club is important to put out high scores and to hit the correct shot. So, various studies have been conducted on golf clubs and swings to select an appropriate golf club. However, only a few studies are available on how the swing changes when the physical characteristics of the club are changed. The purpose of this study was to analyze the torque data during the swing by using the short-time Fourier transform (STFT) to clarify how the mass change of the shaft affects the swing. First, we measured the golfer's swing at the time of change in shaft mass using a motion capture system and created a three-dimensional rigid body dynamics model consisting of arms and clubs. Next, we calculated the torque data exhibited during the swing using inverse dynamics calculation. After we applied the STFT, confirmed the main frequency component and extracted common points between testers by ANOVA and multiple comparison test. Finally, we confirmed the effect of shaft weight on the spectrogram in each tester.