A Dynamic Prescriptive Maintenance Model Considering System Aging and Degradation

Abstract

This paper develops a dynamic maintenance strategy for a system subject to aging and degradation. The influence of degradation level and aging on system failure rate is modeled in an additive way. Based on the observed degradation level at the inspection, repair or replacement is carried out upon the system. Previous researches assume that repair will always lead to an improvement in the health condition of the system. However, in our study, repair reduces the system age but on the other hand, increases the degradation level. Considering the two-fold influence of maintenance actions, we perform reliability analysis on system reliability as a first step. The evolution of system reliability serves as a foundation for establishing the maintenance model. The optimal maintenance strategy is achieved by minimizing the long-run cost rate in terms of the repair cycle. At each inspection, the parameters of the degradation processes are updated with maximum a posteriori estimation when a new observation arrives. The effectiveness of the proposed model is illustrated through a case study of locomotive wheel-sets. The maintenance model considers the influence of degradation and aging on system failure and dynamically determines the optimal inspection time, which is more flexible than traditional stationary maintenance strategies and can provide better performance in the field.

Implementation of Maintenance Strategies in the Life Cycle Costing of Product-Service Systems

“…Thaduri and Famurewa (2020) generalize these assumptions and describe maintenance strategies as "activities for retaining a system in an operating state or restoring it to a state that is considered necessary for it operation and utilization" (Thaduri and Famurewa, 2020). Basically, the three components of repair, inspection and replacement can be identified within the divergent maintenance strategies (Liu et al, 2019). The former acts as a preventive measure to protect the loss of functionality, whereas an inspection is the constant observation of products before or after a failure (Liu et al, 2019).…”

“…Basically, the three components of repair, inspection and replacement can be identified within the divergent maintenance strategies (Liu et al, 2019). The former acts as a preventive measure to protect the loss of functionality, whereas an inspection is the constant observation of products before or after a failure (Liu et al, 2019). The latter, a replacement, is the immediate reaction to a significant deterioration in the level of functionality (Liu et al, 2019).…”

Condition-Based Maintenance Policy for Systems With a Non-Homogeneous Degradation Process

“…The system is failed when the degradation level exceeds the failure threshold. The system failure is not self-announcing and can only be discovered at inspection, which is referred to as a hidden failure [10], [47]- [49]. Denote {δ i : i = 1, 2, .…”

Jointly optimizing lot sizing and maintenance policy for a production system with two failure modes

“…This raises a challenge on how the lot size can be optimised to improve the economic benefit of the manufacturer, which has been widely studied for a long time (Ben-Daya et al, 2008;Lamas & Chevalier, 2018;Kilic & Tunc, 2019;Ou & Feng, 2019;Taş et al, 2019). In most cases, the optimal lot sizing is obtained by minimising the sum of inventory holding and set-up costs (Liu et al, 2019). In practice, a production system may fail and maintenance may therefore be carried out (Barata et al, 2002;Garbatov & Soares, 2001;Xiao & Peng, 2014;Levitin & Lisnianski, 2000;Cha et al, 2017;Cha et al, 2018;Yang, et al, 2018;Yang et al, 2019;Zhang et al, 2014;Li et al, 2016).…”