Condition based maintenance optimization for multi-component systems using proportional hazards model |
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Authors: | Zhigang Tian Haitao Liao |
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Affiliation: | a Concordia Institute for Information Systems Engineering, Concordia University, 1515 Ste-Catherine Street West EV-7.637, Montreal, Canada H3G 2W1 b Department of Nuclear Engineering, Department of Industrial & Information Engineering, University of Tennessee, Knoxville, TN, USA |
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Abstract: | The objective of condition based maintenance (CBM) is typically to determine an optimal maintenance policy to minimize the overall maintenance cost based on condition monitoring information. The existing work reported in the literature only focuses on determining the optimal CBM policy for a single unit. In this paper, we investigate CBM of multi-component systems, where economic dependency exists among different components subject to condition monitoring. The fixed preventive replacement cost, such as sending a maintenance team to the site, is incurred once a preventive replacement is performed on one component. As a result, it would be more economical to preventively replace multiple components at the same time. In this work, we propose a multi-component system CBM policy based on proportional hazards model (PHM). The cost evaluation of such a CBM policy becomes much more complex when we extend the PHM based CBM policy from a single unit to a multi-component system. A numerical algorithm is developed in this paper for the exact cost evaluation of the PHM based multi-component CBM policy. Examples using real-world condition monitoring data are provided to demonstrate the proposed methods. |
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Keywords: | Condition based maintenance Multi-component systems Proportional hazards model Economic dependency |
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