Analysis and fault diagnosis on abnormal vibration occurred on a turbogenerator unit were presented in detail.Such factors as oil film oscillation

static and dynamic friction and electrical faults were considered as the main reasons.By adjusting the rotor center position

bearing parameters and elevation

and the generator air gap

the vibration fault was eliminated successfully.Besides

the external disturbance can also result in oil film oscillation.So reducing the external disturbance and improving the bearing stability should be both considered during the oil film oscillation elimination.