A Reliability Analysis Method for Aeroengine Turbine Disk System

Abstract

The invention discloses a reliability analysis method for an aero-engine turbine blade disk system, including establishing a system block diagram; establishing a system dynamic Bayesian network and a dynamic Bayesian network model of a system failure mode; is a plurality of static Bayesian networks; the obtained static Bayesian network structure is decomposed into a single-connected area network and a multi-connected area network; for the single-connected area network, the reasoning method of static Bayesian network is used for bidirectional derivation; The multi-connected area network adopts the bucket elimination method for bidirectional derivation and separate solutions to solve the failure rate of the aero-engine turbine blisk system, that is, the failure rate of system components and the failure rate of each failure mode. The reliability analysis method of the aero-engine turbine blisk system of the invention overcomes the problems of complex expression, low calculation efficiency, combined explosion and the like when analyzing large, complex and dynamic structures of the traditional reliability analysis method, and improves the calculation efficiency.

Description

technical field [0001] The invention relates to the technical field of reliability analysis, in particular to a reliability analysis method for an aeroengine turbine blisk system. Background technique [0002] The engine is the power plant of the aircraft, which provides flight thrust and is known as the "heart" of the aircraft. A turbine engine is a model that uses rotating parts to convert internal energy into kinetic energy. The highly reliable engine system is an important guarantee for the overall system safety of the aircraft. In recent years, 80% of the mechanical failures in my country's aviation field are caused by the failure of rotating parts. The research on reliability of aeroengine turbine blisk system is of great significance to the design and maintenance of blisk system. With the development of the aviation industry, the requirements for the performance of aero-engines have been continuously improved, and the thrust-to-weight ratio has continued to increas...

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Problems solved by technology

In addition, the turbine shaft is affected by factors such as wear and corrosion, which can also cause failure

[0004] The failure modes of the aeroengine turbine bladed disk system are diverse, and it is difficult to solve the system reliability under the dynamic parameters of all failure modes. The existing fault tree analysis method is difficult to describe the complex turbine bladed disk system. The minimum road set method is used in In solving the reliability of large-scale systems, the calculation efficiency is low, and there is a combinatorial explosion problem

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