System availability under redundancy sharing of standby components

Tongdan Jin, Wei Xie, Haitao Liao, Wilkistar Otieno

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

5 Scopus citations


Conventional approaches to system availability assurance usually revolve around reliability-redundancy allocation and spare parts provisioning. This paper proposes a new scheme called redundancy sharing to enhance the availability of k-out-of-n:G systems. Under the new scheme, hot standby components in one system can be transferred to other systems for which the number of functional components drops below k. Although redundancy sharing is frequently practiced in private and defense industries, the underlying theory is rarely investigated in literature. This paper makes an early attempt to estimate the system availability considering redundancy sharing, and further discuss its potential benefits to the overall fleet availability. We strive to achieve two objectives: 1) estimating system availability by jointly considering redundancy sharing, redundancy allocation, and spare parts inventory; and 2) demonstrating the effectiveness and benefit of redundancy sharing in a variety of operating conditions. Continuous-time Markov model and multi-echelon inventory theory are employed to characterize the operation and maintenance of small and large fleets, respectively.

Original languageEnglish (US)
Title of host publicationRAMS 2015 - 61st Annual Reliability and Maintainability Symposium, Proceedings and Tutorials 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479967025
StatePublished - May 8 2015
Event61st Annual Reliability and Maintainability Symposium, RAMS 2015 - Palm Harbor, United States
Duration: Jan 26 2015Jan 29 2015

Publication series

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


Other61st Annual Reliability and Maintainability Symposium, RAMS 2015
Country/TerritoryUnited States
CityPalm Harbor


  • k-out-of-n systems
  • redundancy allocation
  • redundancy sharing
  • repairable inventory

ASJC Scopus subject areas

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


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