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On system reliability for time-varying structure

Author

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  • Cui, L.X.
  • Du, Yi-Mu
  • Sun, C.P.

Abstract

In reliability theory, the aging of a multi-state system is dominated by both the components and the corresponding structure functions. In previous studies, structures are usually assumed to be static, and thus the time-independent structure functions are utilized. However, due to the complex nature of aging, the structure could also vary with time, which may lead to unsatisfactory assessment reliability with the static structure-based analysis. The current investigation provides a universal approach to assessing the reliability of complex systems with time-varying structures. An open-system model is introduced to broaden the logic method of the system reliability. The analysis of open-system model implies that structure functions are probabilistically described by the time-varying structure distributions, which are the fine graining of the conditional probabilistic tables (CPTs) of the Bayesian networks. The aging of components and the time-varying structures are integrated into a probabilistic graphical model together, which is put forth to assess the time-varying reliability of complex systems. A general algorithm based on expectation–maximization (EM) for various dynamic processes for components and system structures is obtained. Two specific processes, e.g., Markov and Weibull, are studied in detail. Three examples are presented to illustrate the proposed approach and give a deeper understanding of time-varying structures.

Suggested Citation

  • Cui, L.X. & Du, Yi-Mu & Sun, C.P., 2023. "On system reliability for time-varying structure," Reliability Engineering and System Safety, Elsevier, vol. 234(C).
    • Handle: RePEc:eee:reensy:v:234:y:2023:i:c:s0951832023000613
    DOI: 10.1016/j.ress.2023.109146
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    References listed on IDEAS

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