Optimal maintenance strategy for systems with two failure modes

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Peng, Rui and Liu, Bin and Zhai, Qingqing and Wang, Wenbin (2019) Optimal maintenance strategy for systems with two failure modes. Reliability Engineering and System Safety, 188. pp. 624-632. ISSN 0951-8320 (https://doi.org/10.1016/j.ress.2017.07.014)

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Abstract

This paper considers a single-unit system subject to two types of failures: a traditional catastrophic failure and a two-stage delayed failure. Periodic inspections are carried out to identify the defective stage of the two-stage failure process, whereas preventive replacements are implemented to avoid any potential failure due to the catastrophic failure mode. We construct a basic maintenance model and then extend it to the cases of imperfect inspections (i.e., inspections that do not always notice a defective state). We analyze the renewal process of the system and establish the expected long-run cost rate (ELRCR). The optimal inspection period and preventive replacement interval are determined by minimizing the ELRCR. A case study on infusion pumps is presented to illustrate the proposed model.

ORCID iDs

Peng, Rui, Liu, Bin ORCID logoORCID: https://orcid.org/0000-0002-3946-8124, Zhai, Qingqing and Wang, Wenbin;
CORE (COnnecting REpositories)