URL：https://www.researchgate.net/profile/Raimondas-Vasiliauskas/publication/265269656/figure/fig1/AS:669372993531924@1536602366837/Forces-designed-in-a-ring-actuator-U-radial-coordinate-Ttangential-coordinate_Q320.jpg
掲載元：https://www.researchgate.net/figure/Mode-of-vibration-in-the-ring-actuator_fig2_265269656
