A method is presented to reduce the lateral vibration amplitude of an unbalanced rotor accelerating or decelerating through its critical speed, by means of modulating the response phase with varying acceleration rate. Theoretical and numerical analysis on the amplitude and the phase characteristics of lateral vibration of a rotor model are made. Numerical results show that when the rotor passes through its critical speed with a modulated phase, the response amplitude can be reduced by 20% or so, compared with the nonmodulated (constant) acceleration case.

Issue Section:
Gas Turbines: Structures and Dynamics
Keywords:
electric machines, rotors, vibration control, machine control, control system synthesis
Topics:
Rotors, Vibration, Disks
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Copyright © 2003
 by ASME
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