Stabilization of Elastic Rotors with Fluid Components by Magnetic Bearings

It is wellknown that fluid components in rotating systems may cause instabilities. This paper deals with the problem of mastering these instabilities by applying magnetic bearings and developing suitable control concepts. In the first part, we focus on the mathematical description of the coupled fluid-rotor system in a way to making it possible to carry out control design. The results already obtained show that instabilities caused by the rotor-fluid interactions can be avoided by applying appropriate control forces generated by a magnetic bearing. The design of more sophisticated control concepts is still in progress. For verifYing the mathematical model of the system as well as the effectiveness of the developed control concepts, a test rig is introduced.