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Reliability analysis for systems based on degradation rates and hard failure thresholds changing with degradation levels

Chang, M.; Huang, X.; Coolen, F.P.A.; Coolen-Maturi, T.

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Authors

M. Chang

X. Huang



Abstract

Degradation-shock failure processes widely exist in practice, and extensive work has been carried out to better describe such processes. In this paper, a new model is developed for reliability analysis of systems subject to dependent degradation-shock failure processes. The proposed model extends the previous work by considering the effects of the degradation levels on both the degradation rates and the hard failure thresholds. Instead of shifting with the shock levels, the degradation rates are supposed to increase with the degradation levels, and the hard failure thresholds decrease when the system deteriorates to certain levels. Then, the general reliability functions for the systems subject to multi-state degradation are provided, after deriving the reliability formulas for the systems with two state degradation. In addition, the accuracy of the proposed methods is verified by Monte-Carlo simulation. Finally, a numerical example is presented to illustrate the validity of the presented model, and analytical results of the proposed model are compared with previous work. The results indicate that the presented method offers a more realistic system reliability evaluation.

Journal Article Type Article
Acceptance Date Aug 18, 2021
Online Publication Date Sep 1, 2021
Publication Date 2021-12
Deposit Date Aug 19, 2021
Publicly Available Date Sep 2, 2023
Journal Reliability Engineering and System Safety
Print ISSN 0951-8320
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 216
Article Number 108007
DOI https://doi.org/10.1016/j.ress.2021.108007
Public URL https://durham-repository.worktribe.com/output/1243692

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