Abstract
A rotor bearing system usually has various faults that could simultaneously exist (e.g., rub-impact, pedestal looseness etc), but, in the past, individual fault has been mostly modeled and analyzed separately. In this paper, the dynamic model of rotor bearing system with rub-impact and pedestal looseness is formulated. Continuation-shooting method for the periodic solution of nonlinear non-autonomous system is used to obtain the bifurcation and stability of the periodic motion of the rotor-bearing system. The effect of the unbalance and rotor/stator clearance on the bifurcation and stability of the periodic motion of the rotor bearing system are analyzed respectively. It has been observed that the periodic motion of the system lose stability by Hopf and doubling bifurcation respectively under the small and large unbalance; the system with coupling faults has the same way of losing stability as the system with rub-impact only. The Hopf bifurcation set is broadened with the rotor/stator clearance decreases. The results of the paper may provide theory references to fault diagnoses, vibration control and security operating of the rotor system.
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