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Gu Yujiong
He Chengbing
Yang Kun
Zhang Jianqiang
Department of Power Engineering,
North China Electric Power University,
Beijing 102206, China |
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INFLUENCES ON COUPLED LATERAL
AND TORSION VIBRATION BEHAVIOR
OF RUB-IMPACT ROTOR BY ROTOR-
TO-STATOR CLEARANCE
*
Abstract:
With the establishment of the nonlinear coupled lateral and torsion vibration equations of rub-impact Jeffcott
rotor and through numerical simulations, the influences on
lateral and torsion vibration behavior by rotor-to-stator clearance are analyzed, which prove that there is strong impact on coupled lateral and torsion vibration behavior. Smaller the clearance is, more complex the motion of rotor is. When the clearance is larger, the frequency spectrum of rub-impact rotor is mainly composed of 1/2X, 1/3X and 1/4X components. With the decrease of clearance, quasi-periodic and chaotic motions will be present. Under different clearances, the bifurcation diagrams of lateral and torsion vibrations can be divided into rub-free zone, rub-light zone and three complex motion zones in which the motion trend of lateral vibration is similar to that of the torsion vibration. Compared with the lateral vibration, the torsion vibration is of more motion forms and more abundant frequency components in amplitude spectrum.
Key words: Rub-impact rotor Rotor-to-stator clearance Coupled lateral and torsion vibrations |