Coupled Bending and Torsional Vibrations Due to Rotor-to-Stator Contacts

A new Rotor to Stator contact model is well developed,which consists of a rotor with two discs mounted on a massless shaft and a stator.This model is used to describe the bending/torsion coupled vibrations of a rotor and an elastic stator due to the contact.The model is suitable to simulate full annular rubs,partial rubs and also the heavily destructive dry friction whip when the rotor rolls on the stator's inner surface.The numerical calculations show a variety of rotor orbit figures due to the different types of contacts and reveal the significant influences of all system parameters on the rotor behaviour.The rotor stator contact problem can be detected by monitoring the torsional vibration signals.