航空发动机拍振问题研究与验证

Combined with theoretical simulation of the beat vibration, analysis of the measured vibration signal and summary of the actual vibration elimination experience, three multi-source beat vibration modes of aero-engines were discussed. The identification process and the elimination method of the beat vibration fault were established. Experimental verification showed that for the three common multi-source coupling beat modes, the multi-source beat vibration and the vibration fluctuation could be eliminated when the multi-source excitation frequency differed by more than 3%. The proposed process and method were implemented and verified in engine beat vibration and fluctuation trouble-shooting, and the low-pressure rotor 2 times frequency-high-pressure rotor fundamental frequency coupled beat vibration was accurately identified. The low-pressure rotor speed was well-tuned through the control schedule to separate the above two frequencies by 3%. The vibration fluctuations caused by beat vibration was eliminated and the proposed method was validated.