Rotor/seal full annular rub, including synchronous (forward) and reverse (backward) precessions, has been investigated both experimentally and analytically. Of particular interest is the finding of reverse precessional full annular rub (dry whip) that occurs repeatedly in small clearance cases without any outside disturbance. The experimental results include rub triggering mechanism, mass unbalance, and rotative speed effects. A simplified mathematical model is used to interpret experimental results. Nonlinear solutions for both synchronous and reverse precessions are obtained along with instability zones. Mass unbalance effect on shifting from synchronous response to reverse rub and destabilizing factors such as dry friction, rotor damping, and seal stiffness, are discussed.
Rotor/Seal Experimental and Analytical Study on Full Annular Rub
Contributed by the International Gas Turbine Institute (IGTI) of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Paper presented at the International Gas Turbine and Aeroengine Congress and Exhibition, Munich, Germany, May 8–11, 2000; Paper 00-GT-389. Manuscript received by IGTI Nov. 1999; final revision received by ASME Headquarters Feb. 2000. Associate Editor: D. Wisler.
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Yu, J. J., Goldman , P., Bently , D. E., and Muzynska, A. (March 26, 2002). "Rotor/Seal Experimental and Analytical Study on Full Annular Rub ." ASME. J. Eng. Gas Turbines Power. April 2002; 124(2): 340–350. https://doi.org/10.1115/1.1416691
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