A Common Cause Failure Reliability Assignment System Based on Fault Tree Analysis

Abstract

The invention discloses a common cause failure reliability distributing system based on fault tree analysis. One reliability distribution of the common cause failure reliability distributing system based on the fault tree analysis mainly includes steps that 1, primarily distributing the reliability for key equipment and components which need to improve the reliability in the system according to an expert knowledge base; 2, forming a final system model and a final key equipment and component list according to a user input system modification model and the expert knowledge base; 3, circularly and finely adjusting the reliability of the final key equipment and component till the system reliability fully satisfies the user need. The common cause failure reliability distributing system based on the fault tree analysis combines the fault tree analysis method for the common cause failure with the expert knowledge base method to perform the constrained reliability distribution for the complex system with common cause failure.

Description

technical field [0001] The invention relates to a common cause failure reliability distribution system based on fault tree analysis, and belongs to the field of reliability distribution of complex systems considering common cause failure. Background technique [0002] High reliability of products can be obtained through reliability design, which is mainly composed of two important links: reliability prediction and reliability allocation. Reliability allocation is to assign the target reliability to the subsystems, subsystems or components that make up the system according to certain rules according to the system reliability index specified in the system design document. [0003] The reliability distribution of the system is not just a simple quantity distribution, but many influencing factors should be considered in the redistribution process. The reliability of the system is a quantity that changes with the type of functions to be completed by the functional components and...

AI Technical Summary

Problems solved by technology

For large and complex systems, the existing reliability allocation methods have their own shortcomings and limitations, such as the inability to consider common cause failure, too much subjectivity, too simple allocation, etc. The allocation is not reasonable enough

[0005] For example: general generating function method, dynamic programming method and genetic algorithm can carry out reliability allocation for constrained series-parallel system including common cause failure, but it has a large amount of calculation and cannot handle large-scale systems, nor can it deal with cold storage conditions. complex system

[0006] The traditional fault tree-based allocation method is an unconstrained reliability allocation method, which can analyze large-scale and complex systems including common cause failures, but cannot consider constraints

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