转子叶轮—定子触碰故障的分析与辨识

基于航空涡轮发动机和工业透平机中的转子叶轮－定子间触故障背景，以力学建模力指导搭建了两类简支型的转子－定子触碰故障实验台架，考察了转子－定子间正常无触碰、早期尖锐型轻微触碰、中期兰尖锐型触碰，晚期平钝型触碰4种状态态时转子振动位移的时域轨迹，观测到了早期尖锐型轻微触磁时伴生的混沌现象；采用FFT方法对上述4种状态试验数据的频率结构作了分析，结果表明当出现三分频以下（包括三分频）的分频特征时可以初步判断叶片发生了早期触碰，而当转子振动位移的频谱图中仅存有两个分频分量甚至抽频分量时，叶片－转子间的触碰故障已非一日之寒。

Analysis and Identification of Rub-impact Faultbetween Rotor and Stator

Based on the background of rub impact faults of aeroengines and industrial turbines, two kinds of test rigs with free supports are established according to a dynamic model to study the rub impact faults between the rotor and the stator. The orbits of the vibration of rotor displacement corresponding to four different impact conditions are respectively examined, which are the normal condition, the early sharp impact condition, the semi sharp impact condition and the terminal blunt impact condition. The route to chaos, appearing with the early sharp impact, is observed. The analysis of the experimental data on the four impact conditions in the frequency domain shows that the appearance of the sub harmonic vibrations of the order 1/3 and 1/4 is the effective evidence for initial light rub impact, and the harmonic vibrations of the order of 1/1 and 1/2 are for the very serious rub impact faults.