Comparison of Controller Designs for Attenuation of Vibration in a Rotor Bearing System Under Synchronous and Transient Conditions

In this paper two controllers are compared with regard to their performance in a wmputer simulation ofloss of mass from a rotor. Both wntrollers are considered to use a magnetic actuator to apply the wntrol forces and operate only on the displacement of the rotor at certain measurement locations. The first controller is designed using H 00 optimisation. The sewnd, called a synchronous feedback controller, is a closed-loop version of an open-loop controller used for the attenuation of synchronous vibration. The synchronous feedback controller can control vibration under both steady state and transient wnditions. The performance of the synchronous feedback wntroller is slightly inferior to the Hex:; controller. However, this is to be offset against the fact that the synchronous feedback controller would be much simpler to implement than the H 00 controller in practical applications.