Importance measures for critical components in complex system based on Copula Hierarchical Bayesian Network

Rentong Chen, Chao Zhang, Shaoping Wang, Enrico Zio (), Hongyan Dui and Yadong Zhang
Additional contact information
Rentong Chen: BUAA - Beihang University, POLIMI - Politecnico di Milano [Milan]
Chao Zhang: BUAA - Beihang University
Shaoping Wang: BUAA - Beihang University
Enrico Zio: POLIMI - Politecnico di Milano [Milan], CRC - Centre de recherche sur les Risques et les Crises - Mines Paris - PSL (École nationale supérieure des mines de Paris) - PSL - Université Paris Sciences et Lettres
Hongyan Dui: Zhengzhou University
Yadong Zhang: BUAA - Beihang University

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Abstract: In order to identify the vulnerable components and ensure the required reliability of mechatronics systems, importance measures of critical components are crucially used in the early design of systems. However, complex mechatronics systems have the properties of hierarchy, nonlinearity, dependency, uncertainty, and randomness, which make it difficult to analyze the coupling failure mechanisms, model the system, estimate its reliability, and complete importance measures of its components. This paper proposes importance measures for components with continuous time degradation. The Wiener process model is used to describe the continuous-time degradation process, and the Copula Hierarchical Bayesian Network (CHBN) is developed for system reliability estimation. Six importance measures are proposed for continuous-time degrading components. These importance measures provide a time-dependent analysis of the criticality of components, thus adding insights on the contributions of the components on the system reliability or performance over time. A case study on the harmonic gear drive is then conducted to demonstrate the use of the proposed importance measures. The results of the study show that the CHBN-based importance measures can be a valuable decision-support tool for designers in the early design of systems.

Keywords: Components degradation; Copula Hierarchical Bayesian Network; Importance measures; System reliability; Wiener process; Bayesian networks; Complex networks; Continuous time systems; Decision support systems; Failure (mechanical); Hierarchical systems; Random processes; Reliability analysis (search for similar items in EconPapers)
Date: 2023-02
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Citations: View citations in EconPapers (10)

Published in Reliability Engineering and System Safety, 2023, 230, pp.108883. ⟨10.1016/j.ress.2022.108883⟩

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Persistent link: https://EconPapers.repec.org/RePEc:hal:journl:hal-04103914

DOI: 10.1016/j.ress.2022.108883

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