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Availability Optimization of Systems Subject to Competing Risk
European Journal of Operational Research (2010)
  • Y. Zhu, Rutgers University - New Brunswick/Piscataway
  • E. A. Elsayed, Rutgers University - New Brunswick/Piscataway
  • Haitao Liao, University of Tennessee - Knoxville
  • L. Y. Chan, University of Hong Kong
This paper considers a competing risk (degradation and sudden failure) maintenance situation. A maintenance model and a repair cost model are presented. The degradation state of the units is continuously monitored. When either the degradation level reaches a predetermined threshold or a sudden failure occurs before the unit reaches the degradation threshold level, the unit is immediately repaired (renewed) and restored to operation. The subsequent repair times increase with the number of renewals. This process is repeated until a predetermined time is reached for preventive maintenance to be performed. The optimal maintenance schedule that maximizes the unit availability subject to repair cost constraint is determined in terms of the degradation threshold level and the time to perform preventive maintenance.
  • Preventive maintenance; Competing risk,
  • Degradation process,
  • Sudden failure,
  • Non-stationary renewal process
Publication Date
May, 2010
Citation Information
Y. Zhu, E. A. Elsayed, Haitao Liao, and L. Y. Chan. "Availability Optimization of Systems Subject to Competing Risk" European Journal of Operational Research 202.3 (2010): 781-788.