Anew rotor-ball bearing-support-stator coupling system dynamic model including rubbing fault was established for rotor-bearing system of practical aeroengine.In the model

the stator motion

the flexible support

squeeze film damper(SFD) were considered

and the nonlinear factors of ball bearing such as the clearance of bearing

nonlinear Hertzian contract force between balls and races

and the varying compliance vibration because of periodical variety of contact position between balls and races were modeled.The numerical integral method was employed to obtain system's responses

and an aeroengine tester with stator was established to carry out rubbing fault experiment.Finally

the simulation results from rotor-ball bearing-support-stator coupling model were compared with the experiment results in order to indicate the validity of the new model.