Aero-engine reliability analysis method based on multi-state multi-valued decision diagram

Abstract

The invention discloses an aero-engine reliability analysis method based on a multi-state multi-valued decision diagram, and mainly solves the problem of overlarge state space in multi-state system modeling in the prior art. The implementation scheme comprises the following steps: 1) establishing a multi-state multi-value decision diagram model of a bottom event; 2) sorting the bottom events of the dynamic doors; 3) establishing a multi-state multi-value decision diagram model of the static door and the dynamic door; 4) sequencing the bottom events in a non-descending order according to the number of event states; 5) adjusting the sequence of the bottom events in the step 4); and 6) establishing a multi-state multi-value decision diagram model of the aero-engine rotor system according to the bottom event sequence of the step 5). According to the method, the influence of the state number of the bottom event on the size of the multi-state multi-value decision diagram is considered; the optimized bottom event sequence is obtained by sorting the bottom events, the size of the multi-state multi-value decision diagram is reduced, the scale of the state space in the system reliability analysis model is reduced, and the method can be used for carrying out reliability analysis on the aero-engine rotor system.

Description

technical field [0001] The invention belongs to the field of aviation technology, in particular to an aero-engine modeling method, which can be used for reliability analysis of the aero-engine rotor system. Background technique [0002] In the past, most of the studies on reliability were carried out based on binary state systems, and the system and its components were considered to have only two states: "normal" and "failure". Therefore, the theory and tools for modeling and analyzing binary state systems have been very mature, including methods such as fault tree, reliability block diagram and binary decision diagram BDD. However, in reality, most systems are relatively complex multi-state systems. Therefore, the reliability modeling and analysis of multi-state systems has gradually become a hot research topic at home and abroad. In 1983, Hudson J C and Kapur K C first proposed the reliability analysis method for multi-state components of multi-state systems, and defined ...

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Problems solved by technology

However, these methods can only solve the static fault tree model containing only AND-OR gates, and are not suitable for multi-state systems containing dynamic logic relations

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