Abstract: A new rubbing model is proposed， which considers the change in rotor-stator clearance and the number of blades. The maneuver load caused by maneuvering flight and nonlinear Hertz contact force of rolling bearing are also considered. The nonlinear dynamic differential equation of rotor-ball bearings-rubbing coupling system is established by using the finite element method. The effects of rotational speed and maneuver load on the dynamic behavior of the system are analyzed. It is shown that the sub-harmonic resonance of rotor system increases under the rubbing fault. The high frequency components are excited by the rubbing fault at lower speeds， while the low frequency components are excited by the rubbing fault at high speeds. The maneuver load makes the rotor’s vibration increase， which may result in the rubbing fault between the rotor and the stator.

Key words: maneuvering flight, rubbing model, rotor-bearing-rubbing coupling, dynamic model, nonlinear vibration