A new rotor-ball bearing-stator coupling system

including imbalance-misalignment-rubbing coupling fault

was established for aero-engine vibration.In the coupling system

the stator motion was considered

and the nonlinear factors of ball bearing such as the clearance

nonlinear Hertzian contact

and the varying compliance(VC)

were fully taken into account;in the process of fault coupling

the imbalance

the misalignment and the rubbing faults were modeled respectively.The numerical integral method was used to obtain system's responses

and the characteristics about the coupling faults were analyzed.The simulation results indicate the correctness and effectiveness of the new model.