ONLINE CONTROLLER IMPLEMENTATION FOR ATTENUATION OF SYNCHRONOUS AND TRANSIENT ROTOR VIBRATION

A study is presented in which the vibrations of a rotor are controlled under both synchronous and transient conditions. A Fourier decomposit ion of the rotor vibration during successive synchronous cycles is per formed and the fundamental amplitude component is monitored. An analys is of the component response is developed and a strategy is proposed f or the rotor vibration control. This is based around a gain matrix der ived for a steady-state open-loop controller and the loop is then clos ed in a form of generalized integral control using a single feedback p arameter. performance and stability characteristics are investigated a nd for a linear system it is shown that the control of transient vibra tion caused by sudden mass loss from a rotor is possible. Limitations are stated if the system becomes nonlinear. Multi-processor hardware i s used for on-line implementation of the controller algorithm to an ex perimental rig, consisting of a rotor supported by two journal bearing s with a magnetic control actuator The results show the effectiveness of the vibration control, which is evaluated over the stable operating range of the controller.