中文摘要：

提出基于倒频谱分析的航空发动机碰摩部位识别方法，利用倒频谱分析方法，从机匣振动加速度信号中分离出传递路径特征，该特征反映从碰摩点到机匣测点的传递路径信息，因此，不同的碰摩部位将具有不同的传递特征信息，并以此提取出20个碰摩部位识别特征。利用航空发动机转子试验器模拟大量不同部位的碰摩试验，对不同碰摩部位的试验样本进行特征分析，表明相同碰摩部位的特征一致性，以及不同碰摩部位的特征差异性，利用最近邻分类方法，进行碰摩部位识别，识别率达到100％，充分验证了方法的有效性。

英文摘要：

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.