An imperfect maintenance policy for mission-oriented systems subject to degradation and external shocks

Bin Liu, Min Xie, Zhengguo Xu, Way Kuo

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71 Citations (Scopus)
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This paper develops a maintenance model for mission-oriented systems subject to natural degradation and external shocks. For mission-oriented systems which are used to perform safety-critical tasks, maintenance actions need to satisfy a range of constraints such as availability/reliability, maintenance duration and the opportunity of maintenance. Additionally, in developing maintenance policy, one needs to consider the natural degradation due to aging and wearing along with the external shocks due to variations of the operating environment. In this paper, the natural degradation is modeled as a Wiener process and the arrival of random shock as a homogeneous Poisson process. The damage caused by shocks is integrated into the degradation process, according to the cumulative shock model. Improvement factor model is used to characterize the impact of maintenance actions on system restoration. Optimal maintenance policy is obtained by minimizing the long-run cost rate. Finally, an example of subsea blowout preventer system is presented to illustrate the effectiveness of the proposed model.
Original languageEnglish
Pages (from-to)21-32
Number of pages12
JournalComputers and Industrial Engineering
Early online date13 Oct 2016
Publication statusPublished - 1 Dec 2016


  • imprefect maintenance
  • mission oriented system
  • natural degradation
  • external shocks
  • reliability contstraint

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