Rotor bearing systems operating at high speeds present severe problems when vibrations occur. This thesis describes a method for controlling the vibrations, using electromagnetic exiters.
A feedback controller which utilize the proportional-derivative control algorithm is developed to increase the stiffness and damping of the shaft. Based upon the feedback command signal, the exiters generate the control force to the vibrating shaft in such a way that its vibration is reduced.
The effects of the controller gain parameters on the response characteristics such as the natural frequencies and damping ratios are experimentally investigated to evaluate the control performance. Also, the effects of the actuator and sensor positions are investigated.
The results favorably compare with theoretical ones obtained from a simply-supported beam model.