Method for evaluating operating reliability of multi-model integrated aero-engine under multiple failure modes

An aero-engine and failure mode technology, applied in the field of aviation safety, can solve the problem that the reliability evaluation model cannot comprehensively reflect the impact of multiple failure modes on the operational reliability of aero-engines

Active Publication Date: 2014-05-07
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] In order to solve the problem that a single reliability evaluation model in the prior art cannot comprehensively reflect the influence of multiple failure modes on the operational reliability of aero-engines, the present invention provides a multi-model integrated aero-engine operational reliability evaluation under multiple failure modes method

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  • Method for evaluating operating reliability of multi-model integrated aero-engine under multiple failure modes
  • Method for evaluating operating reliability of multi-model integrated aero-engine under multiple failure modes
  • Method for evaluating operating reliability of multi-model integrated aero-engine under multiple failure modes

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[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] For the aero-engine operation process, there are many failure modes, mainly including performance degradation failure, structural strength failure and sudden failure. The interaction of multiple failure modes affects the reliability level of aero-engine operation. The implementation process can be divided into The following 6 steps, such as figure 1 shown.

[0028] 1. Analysis of multiple failure modes of aero-engine

[0029] There are many failure modes during the operation of aero-engines. These failures can be manifested as progressive performance degradation failure, structural strength failure, or sudden failure. For progressive failure, monitoring parameters can be used to monitor its state. In the actual operation of aero-engine, multiple failure modes may act independently, but most of the time, multiple failure modes often act simultaneously. The anal...

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Abstract

The invention provides a method for evaluating operating reliability of a multi-model integrated aero-engine under multiple failure modes. The method comprises the steps of analyzing the multiple failure modes, establishing a multi-failure mode analyzing model, establishing an alternative evaluation model, judging advantages and disadvantages of each model, establishing a multi-model integrated evaluation model, analyzing the influence from the multiple failure modes to the operating reliability of the aero-engine by applying a Bayesian model averaging method, and carrying out simulation calculation on the operating reliability of the aero-engine by adopting a MCMC (Markov Chain Monte Carlo) algorithm. According to the method provided by the invention, typical failure modes, performance degradation failure, structural strength failure and outburst failure are respectively analyzed, one optimal model is selected from multiple alternative models, multiple models are integrated in one framework by applying a multi-model integration technology for evaluating the operating reliability of the aero-engine, and the evaluation accuracy of the operating reliability of the aero-engine can be increased.

Description

technical field [0001] The invention relates to the field of aviation safety, in particular to a multi-model integrated aero-engine operation reliability evaluation method under multiple failure modes. Background technique [0002] To accurately evaluate the reliability level of aero-engine operation, on the one hand, it can provide a basis for effectively guaranteeing flight safety, and on the other hand, it can provide support for making maintenance decisions, and realize the organic combination of "safety" and "economical" in the operation of aero-engine. [0003] As a typical complex system, aero-engines are affected by a variety of factors in the operation process. The complexity of its operational reliability assessment is reflected in the following three aspects. First, a variety of failure modes often coexist during the operation of aero-engines. , each failure mode has different action mechanisms and changing laws, which increases the difficulty of operational relia...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 王华伟吴海桥葛红娟高军
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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