Journal
APPLIED STOCHASTIC MODELS IN BUSINESS AND INDUSTRY
Volume 26, Issue 6, Pages 689-704Publisher
WILEY
DOI: 10.1002/asmb.811
Keywords
phase-type distribution; availability; shock model; preventive repair; optimization
Categories
Funding
- Ministerio de Educacion y Ciencia, Espana [MTM2007-61511]
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A device that can fail by shocks or ageing under policy N of maintenance is presented. The interarrival times between shocks follow phase-type distributions depending on the number of cumulated shocks. The successive shocks deteriorate the system, and some of them can be fatal. After a prefixed number k of nonfatal shocks, the device is preventively repaired. After a fatal shock the device is correctively repaired. Repairs are as good as new, and follow phase-type distributions. The system is governed by a Markov process whose infinitesimal generator, stationary probability vector, and availability are calculated, obtaining well-structured expressions due to the use of phase-type distributions. The availability is optimized in terms of the number k of preventive repairs. Copyright (C) 2009 John Wiley & Sons, Ltd.
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