テニスラケットの曲げ挙動評価と打撃発電

抄録

This work deals with the dynamic bending and energy harvesting characteristics of tennis rackets for smart devices both numerically and experimentally. First, static loading test was performed to measure the strain on the frame of commercial tennis racket. And, experimental data were then employed to determine the applied load to the tennis racket model of finite element analysis (FEA). After determination the load for analysis, FEA was conducted, and the strain and stress in the racket frame and grip were predicted. Next, the tennis racket model including piezoelectric plate under concentrated load was analyzed and the stress in piezoelectric plate was discussed in detail. And, the induced voltage was evaluated and examined the dependence between the induced voltage and position of the implant also. The impact energy harvesting ability for smart device was then discussed in detail. It was found that the tendency of strain of FEA is good agreement with experimental measurement. There are some stress gaps at the interface between CFRP and Urethane. And, z-direction normal stress in Urethane is almost zero and the normal stress in CFRP is dominant. The induced voltage increases with approaching the fixed end of the grip.