Abstract
Maintenance is an important way to ensure the best performance of repairable systems. This paper considers how to reduce system maintenance cost while ensuring consistent system performance. Due to budget constraints, preventive maintenance (PM) can be done on only some of the system components. Also, different selections of components to be maintained can have markedly different effects on system performance. On the basis of the above issues, this paper proposes an importance-based maintenance priority (IBMP) model to guide the selection of PM components. Then the model is extended to find the degree of correlation between two components to be maintained and a joint importance-based maintenance priority (JIBMP) model to guide the selection of opportunistic maintenance (OM) components is proposed. Also, optimization strategies under various conditions are proposed. Finally, a case of 2H2E architecture is used to demonstrate the proposed method. The results show that generators in the 2E layout have the highest maintenance priority, which further explains the difference in the importance of each component in PM.
Highlights
Maintenance occupies a very important proportion in the whole life cycle of various systems
On the basis of the above issues, this paper proposes an importance-based maintenance priority (IBMP) model to guide the selection of preventive maintenance (PM) components
The results show that generators in the 2E layout have the highest maintenance priority, which further explains the difference in the importance of each component in PM
Summary
Maintenance occupies a very important proportion in the whole life cycle of various systems. In actual systems, the system structure could be complex, and how to determine the maintenance priority of components and reduce the system maintenance cost while improving the reliability of the system become very important. In order to allocate limited maintenance resources to important components in repairable systems and improve the overall reliability of the system, some scholars consider combining importance measure with preventive maintenance and opportunistic maintenance to guide the maintenance of components. Dui et al [8] proposed a cost-based integrated importance measure to identify components or component groups that can be used for preventive maintenance. We use the model to sort the important components and determine the maintenance cost level of system in different states, which could reduce the expected maintenance cost of the system while improving the performance of the system.
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