Safety probability risk assessment method for multi-failure-mode correlation system

Abstract

The invention belongs to the field of system safety technical researches and particularly relates to a safety probability risk assessment method using a set theory for a multi-failure-mode correlation system. According to the method, firstly, for a multi-failure-mode correlation characteristic of a complex system, failure modes of the system are presented by failure domains corresponding to a plurality of time-varying limit state functions by using the set theory, and the problem of system safety modeling in a multi-failure mode is solved; for a degradation characteristic of the failure mode correlation system, the time factor is considered, and the time-varying condition of a system safety model in the multi-failure mode is obtained; and on the basis of obtaining of accumulated failure domains corresponding to the multi-failure mode, the safety risk probability analysis assessment is performed with a Monte Carlo method, and the problem of system safety quantitative assessment correlated with the multi-failure mode and with a time-varying characteristic is solved.

Description

technical field [0001] The invention belongs to the field of system safety technology research, and relates to a safety probability risk evaluation method aimed at multi-failure mode correlation systems by using set theory. Background technique [0002] With the development of aviation weapons and equipment, the modern aviation equipment system has two characteristics: one is that the system is related to or affects multiple functions of the aircraft, and the other is that the state of the system is complex and cannot be independently tested It is difficult to prove its security, and it is difficult to understand its logic without the help of analysis tools, so the security analysis of complex systems has become a difficult research point at present. [0003] Relevant foreign system safety standards and norms define complex systems in detail, and at the same time require consideration of the impact of multiple failures on system safety. ARP 4754 and ARP 4761 define a comple...

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Problems solved by technology

[0005] The purpose of the present invention is to propose a safety probabilistic risk assessment method for multi-failure mode related systems, which breaks through the traditional assumption of failure mode independence in system safety assessment, considers the correlation and time-varying nature of complex system failure modes, and constructs Multi-mode correlation system safety analysis model, and quantitative safety probability risk evaluation, to solve the problem of excessive errors in system safety analysis and evaluation under the assumption that traditional failure modes are independent

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