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Optimal redundancies of parallel–series systems in irrelevancy coverage model

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  • Xiang, Jianwen
  • Wang, Zixiang
  • Wu, Chuanli
  • Zhao, Dongdong
  • Tian, Jing

Abstract

A common method for increasing the reliability of a system is to introduce redundant components. However, when the coverage of a fault is imperfect, the system may fail prior to the exhaustion of spares because of noncovered component failures, and an excessive level of redundancy may reduce rather than improve the system reliability. This study investigates the optimal redundancy of parallel–series systems in an irrelevancy coverage model (ICM), which is an extension of the imperfect fault coverage model (IFCM). Three different optimal strategies are studied in ICM, namely optimal redundancies for reliability maximization, cost minimization, and both. Experimental results demonstrate that the optimal redundancies in the ICM are different from those in the IFCM, and the ICM can accommodate more redundant subsystems for parallel–series systems to achieve higher reliability and lower cost than the IFCM in general.

Suggested Citation

  • Xiang, Jianwen & Wang, Zixiang & Wu, Chuanli & Zhao, Dongdong & Tian, Jing, 2022. "Optimal redundancies of parallel–series systems in irrelevancy coverage model," Reliability Engineering and System Safety, Elsevier, vol. 225(C).
    • Handle: RePEc:eee:reensy:v:225:y:2022:i:c:s0951832022002149
    DOI: 10.1016/j.ress.2022.108567
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    References listed on IDEAS

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