A review on condition-based maintenance optimization models for stochastically deteriorating system
Introduction
Industrial organizations are continuously seeking new strategies to improve the effectiveness of their operations. Maintenance optimization and the selection of maintenance strategies play an important role in the effectiveness of any industrial system's operation. Maintenance actions can be generally classified into two categories: corrective maintenance and preventive maintenance (PM). Traditionally, PM takes the form of system overhaul or unit replacement based on elapsed time, which is often referred to as time-based maintenance (TBM). TBM schedules are typically determined based on a probabilistic model of system failure. In recent years, condition-based maintenance (CBM) has received much attention in the maintenance research community. Unlike TBM policies that are developed based on historical failure data, CBM is a maintenance approach that emphasizes on combining data-driven reliability models with sensor data collected from monitored operating systems to develop strategies for condition monitoring and maintenance. The goal of CBM is to reduce unnecessary maintenance actions and eliminate the risks associated with preventive maintenance actions. Rapid development of computer based monitoring technologies (e.g., advanced sensors) has further facilitated CBM practices.
The literature on the use of mathematical modeling for the purpose of analyzing, planning, and optimizing TBM is abundant. Reviews on TBM can be found in [1], [2], [3], [4], [5], [6], [7]. In contrast, CBM has only received increasing attention recently, and only a few survey papers have considered CBM models extensively. The majority of existing CBM survey papers limits the scope within the diagnostic and prognostic methods and algorithms. For example, Jardine et al. [8] review recent studies and developments in CBM with emphasis on models, algorithms, and technologies for data acquisition and data processing. Peng et al. [9] divide the prognostic models into four categories: physical model, knowledge-based model, data-driven model, and combination model, and review various techniques and algorithms by this category. Ahmad and Kamaruddin [10] present an overview of time-based and condition-based maintenance in industrial applications, and summarize the most recent condition monitoring techniques. Shin and Jun [11] review CBM approach and address several aspects of CBM, such as definition, advantages and disadvantages, related international standards, procedures and techniques. Despite the recent rapid development of sensor technology that facilitates CBM, there exists increasing pressure on reducing unnecessary inspection and/or PM actions and the associated costs incurred from additional data collection, documentation, and analysis through optimal design of CBM policies. Therefore, mathematical modeling and optimization of CBM has become a major concern to operations and maintenance managers, and a review in this particular area is now more relevant. This paper aims at providing a review on CBM literature with emphasis on mathematical modeling approaches, and providing useful references for CBM management professionals and researchers working on CBM planning.
The popularity of CBM in the research community and industrial applications relies heavily on the development of stochastic deterioration models. We refer readers to Si et al. [12] and Ye and Xie [13] for reviews on degradation-based reliability models. The choice of the stochastic process that best describes the deterioration greatly influences the decision of the CBM strategy. In the literature, when the system condition is directly observable, stochastic deterioration models are usually classified based on whether deterioration states are discrete or continuous. For some systems that operate in dynamic environments, deterioration is caused by multiple factors referred to as covariates. For such systems, proportional hazard model (PHM) is commonly used to model the multivariate failure models. In this paper, we classify CBM models based on the three aforementioned classes: discrete, continuous, and PHM (see Fig. 1). Under this classification, we review existing CBM models for both single- and multi-unit systems.
The remainder of the paper is organized as follows. Section 2 reviews the CBM optimization models based on inspection quality, inspection frequency, optimization criteria, maintenance degree, and optimal design. 3 CBM for single-component systems, 4 CBM for multi-component systems review the mathematical modeling of CBM for single- and multi-component deteriorating systems, respectively. Finally, Section 5 concludes the paper with some future CBM research directions.
Section snippets
Condition-based maintenance modeling
The objective of CBM is typically to determine a maintenance policy that optimizes system performance according to certain criteria (i.e. cost, availability, reliability, etc.). The design of CBM policies has mainly focused on (1) inspection schedule and (2) preventive maintenance threshold. This section reviews the CBM optimization models based on inspection quality, inspection frequency, optimization criteria, maintenance degree, and optimal design.
CBM for single-component systems
The literature on CBM has mainly considered single-component systems due to the complexity of the probabilistic analysis for multi-component systems. While some multi-component systems can be considered as single-component systems, as some components will fail more frequently than others, and not all components’ failures will result in the failure of the other components or the whole system. There are also complex multi-component systems that contain multiple critical components, and it is
CBM for multi-component systems
As stated in Section 3, existing literature on CBM has mostly focused on single-component systems. Only a few CBM studies have developed maintenance policies for multi-component systems as the probabilistic analysis and the determination of optimal CBM policies for multi-component systems are much more difficult than those for single-component systems [94]. Wang (2002) reviews literature on maintenance policies for multi-component systems, with focus on PM rather than on CBM. In theory, a CBM
Conclusion and future directions
In this paper, we review recent CBM literature with emphasis on mathematical modeling and optimization approaches. In particular, we focus on optimal design of CBM policies including inspection frequency, inspection/maintenance quality, and optimization criterion. We also review CBM models based on their underlying deterioration models: discrete- and continuous-state degradation models. CBM models for PHM are also reviewed in this paper. We have focused our review and analysis mainly on
Acknowledgement
The authors are grateful to thank the Associate Editor and the anonymous reviewers for the valuable comments and suggestions which contributed to a significant improvement of the original version of this paper. Gratitude is also extended to Professor Richard Cassady for his advice and helpful comments at the beginning of this research. The work of the second author is partially supported by the Center for Advances in Port Management at Lamar University.
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