Abstract: According to the structure features of turbine casing, an experimental device which is used to study on local rub-impact fault was designed. When the high and low rotors are counter-rotating , by using the counter-rotating dual-rotor experimental apparatus as platform, the vibration characteristics excited by high rotor local rub-impact fault and low rotor local rub-impact fault were studied through the experiment. The experimental results show that when local rub-impact fault occurs on counter-rotating dual-rotor, there will be high harmonics, low harmonics and combined frequencies in the vibration signal of stator. And the position of the local rub-impact fault can be defined by analyzing the combined frequencies.

Key words: Aeroengine;Counter-rotating dual-rotor; Local rub-impact; Fault diagnosis; Combined frequencies

摘要： 针对航空发动机涡轮机匣的结构特点,设计了一种可以模拟局部碰摩故障的实验装置。利用对转双转子实验器,实验研究了高、低压转子对转时,单独及同时发生局部碰摩的振动特性。结果表明,对转双转子涡轮发生局部碰摩时,静子的振动信号中会出现高倍频、分数倍频及组合频率成分,通过组合频率成分,可以判断是否发生碰摩及碰摩发生的部件。

关键词: 航空发动机;对转双转子;局部碰摩;故障诊断;组合频率