Abstract: The finite element structure and three-dimensional thermal field coupling model of the rubbing rotor system with thermal bow is established by combined the rotor dynamics theory with heat transfer principles. The stability assessment method based on the predicting of vibration response and heat-input quantity is presented. To overcome the problem of enormous computing in the simulation of multi-field coupling system using tradition dynamic analyzing method, a new method called incremental harmonic balance-Newton iteration method is presented based on the slowly changing characteristic of the heat transfer in shaft, and the verifying of the precision and the efficiency is carried out. The influence of the parameters such as rub-impact stiffness, rub-impact gap, friction coefficient etc. to the stability of the rotor system are quantitative analyzed. The presented method and results can provide theoretical references for the preventing of such kind of fault in rotor system.

Key words: rubbing rotor with thermal bow;multi-filed coupling;incremental harmonic balance method;stability