Journal
EUROPEAN JOURNAL OF OPERATIONAL RESEARCH
Volume 190, Issue 2, Pages 494-508Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ejor.2007.04.056
Keywords
LDQBD process; phase-type distribution; inspection; preventive and corrective repair; degradation
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A warm standby n-system with operational and repair times following phase-type distributions is considered. The online unit goes through degradating levels, determined by inspections. Two types of repairs are performed, preventive and corrective, depending on the degradation level. The standby units undergo corrective repair. This systems is governed by a level-dependent-quasi-birth-and-death proces (LDQBD process), whose generator is constructed. The availability, rate of occurrence of failures, and other quantities of interest are calculated. A numerical example including an optimization problem and illustrating the calculations is presented. This system extend other previously studied in the literature. (C) 2007 Elsevier B.V. All rights reserved.
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