Numerical Simulation Feedback Control Fluid-Induced Instabilities In Rotor System Supported By Hydrodynamic Bearings

0335159 - ÚT 2010 RIV PL eng C - Conference Paper (international conference)
Ferfecki, Petr - Ondrouch, Jan - Poruba, Z.
Numerical Simulation Feedback Control Fluid-Induced Instabilities In Rotor System Supported By Hydrodynamic Bearings.
Active Noise and Vibration Control Methods. Krakow: AGH University of Science and Technology, 2009, s. 41-50. ISBN 83-89772-06-X.
[Conference on Active Noise and Vibration Control Methods /9./. Zakopane (PL), 24.05.2009-27.05.2009]
Institutional research plan: CEZ:AV0Z20760514
Keywords : active control * rotor system * hydrodynamic bearing instability
Subject RIV: JR - Other Machinery

Hydrodynamic bearings are frequently used due to their large carrying capacity and favourable damping characteristics. However for the operation at higher revolutions the fluid-induced instabilities known as oil whirl and oil whip can appear. The mathematical model of the rotor system is assembled under the assumption of rigid shaft, massless bearing shells and nonlinear bearing forces determined on the base of short cylindrical bearing theory from Reynolds equation. By proposed feedback controller the movable bearing shells are directly excited by kinematic excitation. On the base of simulations it was found out that the displacement amplitude of shaft with feedback control was always reduced in the whole revolution range and the limit of oil whirl was shifted to the higher revolutions in case of properly chosen control parameters.
Permanent Link: http://hdl.handle.net/11104/0179701