Abstract:

Grey incidence analysis method is widely used in fault diagnosis of mechanical equipments. Taking aero-engine gas path system as the object,the typical faults of gas path performance are studied. An improved grey incidence analysis method is proposed, which is proved to be effective by analyzing typical turbine faults of PW4164/68 engine. Considering the influential factors of performance parameters measurement of aero-engine, robustness of the grey incidence analysis method is analyzed. The study shows that the grey incidence analysis method is of high robustness in a certain measuring deviation. The improved grey incidence analysis method can accurately identify the engine fault when relative measuring deviation of performance parameters is equal to 0.24,thus the improving measures effectively increase the robustness of grey engine fault recognition method.

Key words: aero-engine, fault diagnosis, grey incidence analysis, robustness