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With the establishment of the nonlinear coupled lateral and torsion vibration equations ofrub-impact Jeffcott rotor and through numerical simulations, the influences on lateral and torsion vi-bration behavior by rotor-to-stator clearance are analyzed, which prove that there is strong impact oncoupled lateral and torsion vibration behavior. Smaller the clearance is, more complex the motion ofrotor is. When the clearance is larger, the frequency spectrum of rub-impact rotor is mainly composedof 1/2X, 1/3X and 1/4X components. With the decrease of clearance, quasi-periodic and chaotic mo-tions will be present. Under different clearances, the bifurcation diagrams of lateral and torsion vibra-tions can be divided into rub-free zone, rub-light zone and three complex motion zones in which themotion trend of lateral vibration is similar to that of the torsion vibration. Compared with the lateralvibration, the torsion vibration is of more motion forms and more abundany frequency components inamplitude specturm.
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 vi-bration behavior by rotor-to-stator clearance are analyzed, which prove that there is strong impact oncoupled lateral and torsion vibration behavior. Smaller the clearance is, more complex the motion ofrotor is. When the clearance is larger, the frequency spectrum of rub-impact rotor is mainly composed of 1/2 ×, 1/3/3X and 1/4 × components. With the decrease of clearance, quasi-periodic and chaotic mo-tions will be present. Under different clearances, the bifurcation diagrams of lateral and torsion vibra-tions can be divided into rub-free zone, rub-light zone and three complex motion zones in which than with the lateral vibration, the torsion vibration is of more motion forms and more abundance frequency components inam plitude specturm