Reliability analysis of dynamic fault trees with Priority-AND gates based on irrelevance coverage model

Siwei Zhou, Luyao Ye, Shengwu Xiong and Jianwen Xiang

Reliability Engineering and System Safety, 2022, vol. 224, issue C

Abstract: The irrelevance coverage model (ICM) is an extension of the imperfect fault coverage model (IFCM), which can reduce the risk of uncovered component failures by isolating irrelevant components in systems. However, the ICM has been limited to static systems so far. To address this issue, we extend the ICM to dynamic systems modeled by dynamic fault trees (DFTs) with Priority-AND (PAND) gates. The component irrelevance is analyzed in the DFTs, which shows a component could become irrelevant due to specific sequence failures of some other components, and the implication of irrelevancy may differ from that in static systems. The definition of minimal irrelevance triggers (MITs) and the reduction rules are introduced based on the temporal algebraic framework. The sum of disjoint products (SDP) method is further applied for the quantitative analysis of system reliability. Case studies demonstrate the effectiveness of our method. Furthermore, the ICM can also play a role in the dynamic systems in terms of reliability improvement compared to the IFCM.

Keywords: Imperfect fault coverage model; Irrelevance coverage model; Reliability analysis; Dynamic fault tree; Priority-AND gate (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:reensy:v:224:y:2022:i:c:s0951832022002034

DOI: 10.1016/j.ress.2022.108553

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