关键词: 航空发动机;振动;监测;测振点

Abstract: To get a more reasonable scheme of airborne vibration health monitoring measuring points for aeroengine,based on the analysis of characteristics of the aeroengine rotor bearing form and force transfer line and the contrast analysis of the vibration signal which is surveyed on the aeroengine when it is in bench tests,the reflection ability and sensitivity of each measuring point vibration signal for configuration malfunction were studied in qualitative and quantitive way.The result shows that these three measuring points all can describe the vibration of the aeroengine,but the sensitivity of each measuring point to the vibration of the aeroengine parts is different.To be specific,the front measuring point vibration mainly reflects the LP compressor vibration and the middle measuring point vibration synthetically reflects the vibration of LP rotor and HP rotor.Especially it is more sensitive for the combination fault which is of HP compressor fault predominatingly.The rear measuring point vibration mainly reflects the vibration of LP rotor and in a certain extent reflects the vibration of HP rotor and it is more sensitive for the combination fault which is of turbine component fault predominatingly.Combining with the contrast and analysis of the thirteen times bench tests vibration signal’s reflection ability and sensitivity for exceeding vibration limits fault,the more reasonable scheme for airborne vibration health monitoring measuring points of the aeroengine is presented,viz.if the vibration measuring scheme is of single measuring point,the rear measuring point should be put above.If the vibration measuring scheme is of two measuring points,then one of these two measuring points should be the front measuring point and the other one should be the rear measuring point.

Key words: Aircraft engine;Vibration;Monitoring;Measuring point