Dear Jason,
Thanks for your reply. That helps. From the simulation results, the rotor speed is constant while the blade deflection vibrates. But I think the blade elastic body motion (vibration) and rigid body motion (rotation) are coupled. So how could FAST get a constant rotor speed while the blade vibrates? I have read the forum Resistant moment of the rotor and of the electric generator but I think that’s case when there’s no blade vibration.
Regards
Dayuan Ju