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Most existing research about complex systems maintenance assumes they consistof the same type of components. However, systems can be assembled withheterogeneous components (for example degrading and non-degrading components)that require different maintenance actions. Since industrial systems becomemore and more complex, more research about the maintenance of systems withheterogeneous components is needed. For this reason, in this paper, a systemconsisting of two groups of components: degrading and non-degrading componentsis analyzed. The main novelty of this paper is the evaluation of a maintenancepolicy at system-level coordinating condition-based maintenance for thedegrading components, delay time to the maintenance and an inspection strategyfor this heterogeneous system. To that end, an analytic cost model is builtusing the semi-regenerative processes theory. Furthermore, a safety constraintrelated to the reliability of the degrading components is imposed. To find theoptimal maintenance strategy, meta-heuristic algorithms are used.

Maintenance cost assessment for heterogeneous multi-component systems incorporating perfect inspections and waiting time to maintenance