Method for evaluating reliability of aircraft engine aiming at competing failure

Abstract

The invention relates to a method for evaluating reliability of an aircraft engine aiming at competing failure. The method comprises the steps of: analyzing a failure rule of the aircraft engine, explaining influences of degradation failure and sudden failure to the reliability of the aircraft engine, judging whether belonging to a competing failure form; proposing an aircraft engine reliability information processing method aiming at the competing failure; acquiring performance degradation data of the aircraft engine, carrying out information fusion by adopting a Bayes linear model, establishing an aircraft engine performance degradation evaluation model; describing a random process of aircraft engine performance degradation by applying a Gamma process; establishing an aircraft engine reliability evaluation model based on performance degradation failure, fusing information of different time sequence points by adopting a Bayes method through using event information of an aircraft engine, establishing an aircraft engine reliability evaluation model based on the sudden failure; and establishing an aircraft engine system reliability evaluation model based on the competing failure, and integrating the degradation failure and the sudden failure of the aircraft engine performance into a frame for analyzing, and calculating the reliability of the completing failure of the aircraft engine.

Description

technical field [0001] The present invention relates to the reliability evaluation of aero-engines, especially in the case of two competing failures of performance degradation and sudden failure, and there is a correlation between performance degradation and competing failures, the system reliability of aero-engines is evaluated. Evaluate, avoid "overestimating" or "underestimating" the reliability of aero-engines, and improve the accuracy of aero-engine reliability evaluation. Background technique [0002] The reliability level of aero-engine directly affects flight safety, and as a complex repairable system, aero-engine's reliability will have a greater impact on maintenance costs. Therefore, the scientific evaluation of the reliability level of aero-engines is one of the important means to realize the coordinated optimization of "safety" and "economy". Relevant research results can be applied not only to the field of aircraft operation, but also to the design field of ae...

AI Technical Summary

Problems solved by technology

Second, the coexistence of multiple failure modes increases the complexity of reliability assessment

Traditional reliability assessment generally assumes a failure mode or a single point of failure, but in terms of the actual engineering of aeroengines, its failure modes are diverse, and only by classification of failure modes can be divided into performance-based Degradation failure and sudden failure failure; and the failure caused by different failure modes is essentially a competing risk relationship, which increases the complexity of the analysis

Third, the correlation between different failure modes increases the complexity of reliability evaluation calculations

When different failure modes exist in the framework of competing failures, if they are not correlated, the calculation is relatively simple; but if the different failure modes are correlated, the difficulty of the calculation is greatly increased

Images