Establishment and analysis to find the optimal inspection plan of redundant systems considering repair time.

Document Type : Research Paper

Authors

Faculty of Industrial Engineering, K.N. Toosi University of Technology, Tehran, Iran

Abstract

Optimal time interval between inspections of the redundant systems is raised as a substantial issue to plan a preventive maintenance model for maintenance planners. To have an optimal time period for preventive maintenance of systems, especially complex systems such as redundant systems, two variables of maintenance are mostly connived. Against other studies in the literature of preventive maintenance in which repair time is a negligible factor as an assumption, repair time is considered as a noticeable variable incorporated into the model developed in this paper. Another contribution, the number of facilities, is focused as a significant variable used in real applications. Particularly, systems with complex performance needing technical repair facilities (i.e., technical repairmen, tools, materials, outsourced repair, etc.). In this regard, parallel systems have been analyzed stochastically using the way of preventive maintenance in which repair time would be contemplated as an essential factor in maintenance planning. Using Markov chain, a model based on expected total cost per time is made to demonstrate that a proper time interval achieving lowest possible cost is obtained by taking into account repair time and the number of repair facility. Three models are studied as instances of redundant systems to find the optimal time interval between inspections. These models differ in the number of repair facilities (i.e., one, two and three repair facilities). A sensitivity analysis is done to depict the variability of input variables over optimal the expected total cost per time and time interval between inspections. As a main contribution, the repair time could be an essential factor in maintenance planning, this study contemplates this factor in redundant systems.

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References

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Journal of Industrial and Systems Engineering
Volume 15, Issue 1 - Serial Number 1
January 2023
Pages 88-109

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History

  • Receive Date: 19 April 2023
  • Revise Date: 11 June 2023
  • Accept Date: 30 June 2023

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