A Reliability Modeling Method Based on the Combination of Fault Mechanism Tree and Fault Tree

Abstract

The invention provides a reliability modeling method based on the combination of fault mechanism trees and fault trees. The method comprises the following steps: step 1, key fault mechanisms of all components of a system and the correlation relationships thereof are analyzed and determined; step 2, FMT models are created for the components of the system; step 3, fault tree models are created for components above the system component level; step 4, bottom events which represent the faults of each component in the fault tree models are replaced with the corresponding FMT models, and the fault tree models and the FTM models are combined to acquire system fault behavior models; and step 5, the system fault behavior models are transformed into BDD models to obtain the unreliability curves of the corresponding components or the system. According to the reliability modeling method, based on the analysis of the fault mechanism correlation relationships, the method for the organic combination between the fault mechanism correlation relationships and the logic gates of the fault trees is given, and the method is the supplement and perfection of the reliability modeling method.

Description

technical field [0001] The invention relates to the field of product reliability modeling, in particular to a reliability modeling method based on the combination of fault mechanism tree and fault tree. Background technique [0002] With the advancement of science and technology, products show a development trend of integration, intelligence and complexity. Complex products or systems show significant hierarchy in terms of function and performance, and at the same time, they also show corresponding hierarchical characteristics in terms of failures. Taking the electronic control system as an example, there are many failure events at the system failure level, a large number of failure modes at the component level, and a large number of failure mechanisms at a deeper physical level. How to effectively describe and analyze the fault and reliability of complex systems has always been a hot issue in reliability modeling. [0003] For complex systems, traditional reliability mode...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the existing reliability modeling method based on fault physics and fault behavior cannot effectively combine the fault mechanism tree below the component level with the fault tree at the system level, and provides a fault mechanism tree based A Reliability Modeling Method Combined with Fault Tree

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