Optimal design of a repairable k-out-of-n system considering maintenance

Ramin Moghaddass, Ming J. Zuo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Scopus citations


The configuration of a repairable system directly affects its performance measures such as mean time between failures and steady state availability. Corrective, preventive, and condition-based maintenance strategies can also affect the overall performance of the system. The objective of this work is to investigate the possible trade-off between the configuration of a repairable k-out-of-n:G system and its maintenance strategy. The redundancy (the number of active red undant components) and the number of cold standby components are considered to be the design decision variables, wh ereas the repair capacity and the maintenance activation point are considered to be the maintenance decision variables. The corresponding stochastic process for this model is formulated using the continuous time Markov process; as well an optimization model is introduced for cost-effective design of a repairable k-out-of-n:G system. The optimization model is used to minimize the overall operational and maintenance cost associated with the system, considering constraints on availability, space and/or budget. Finally, genetic algorithm is used to find the optimal values for the decision variables. The result is demonstrated using a numerical example.

Original languageEnglish (US)
Title of host publication2011 Proceedings - Annual Reliability and Maintainability Symposium, RAMS 2011
StatePublished - May 27 2011
Externally publishedYes
EventAnnual Reliability and Maintainability Symposium, RAMS 2011 - Lake Buena Vista, FL, United States
Duration: Jan 24 2011Jan 27 2011

Publication series

NameProceedings - Annual Reliability and Maintainability Symposium
ISSN (Print)0149-144X


OtherAnnual Reliability and Maintainability Symposium, RAMS 2011
Country/TerritoryUnited States
CityLake Buena Vista, FL


  • maintenance strategies
  • optimal design
  • repairable k-out-of-n:G system

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Mathematics(all)
  • Computer Science Applications


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