Method for analyzing reliability of turbine blade disk system of aircraft engine

Abstract

The invention discloses a method for analyzing reliability of a turbine blade disk system of an aircraft engine. The method comprises the following steps of: establishing a system chart; establishing a system dynamic bayesian network and a system failure-mode dynamic bayesian network model; discretizing and transforming the dynamic bayesian network into multiple static bayesian networks; structurally decomposing the static bayesian networks into simply-connected regional networks and multiply-connected regional networks; performing bidirectional derivation on the simply-connected regional networks by a static bayesian network inference method; and performing bidirectional derivation on the multiply-connected regional networks by a bucket elimination method to respectively solve the failure rate of the turbine blade disk system, namely a system element, of the aircraft engine, and the fault rate of each failure mode. According to the method for analyzing the reliability of the turbine blade disk system of the aircraft engine, the problems of complicated expression, low computational efficiency, combinatorial explosion and the like, which are caused when traditional reliability analyzing methods are used for analyzing large-scaled, complicated and dynamic structures, are solved, and the computational efficiency is enhanced.

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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