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.
Reducing Lateral Vibration of a Rotor Passing Through Critical Speeds by Phase Modulating
Contributed by the Structures and Dynamics Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received by the S&D Division Oct. 1, 2001; final revision received by the ASME Headquarters Oct. 28, 2002. Associate Editor: M. Mignolet.
Wang, S., Lu, Q., and Twizell, E. H. (August 15, 2003). "Reducing Lateral Vibration of a Rotor Passing Through Critical Speeds by Phase Modulating ." ASME. J. Eng. Gas Turbines Power. July 2003; 125(3): 766–771. https://doi.org/10.1115/1.1581893
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