Abstract: The method of aero-engine rubbing positions identification based on cepstrum analysis is proposed. The transfer path characteristics which reflect the transfer characteristics information from rubbing points to casing measuring points are separated from the vibration acceleration signals of casing by means of cepstrum analysis. Therefore, there is different transfer characteristics information at different rubbing positions, and in view of this, twenty rubbing positions identification features are extracted. A large number of rubbing experiments of different positions are simulated with the rotor experiment rig of aero-engine, and the characteristic analysis of experimental samples at different rubbing positions is carried out, and the results indicate the consistency of features to the same rubbing position and the difference of the features to the different rubbing positions. Aero-engine rubbing positions identification is carried out using the nearest neighbor classification method. The recognition rate reaches 100%, and the effectiveness of the method is full verified.

Key words: aero-engine rotor-stator rubbing;rubbing position identification;cepstrum analysis;transfer path