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Replacing nonidentical vital components to extend system life

✍ Scribed by Steven M. Shechter; Matthew D. Bailey; Andrew J. Schaefer

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
81 KB
Volume
55
Category
Article
ISSN
0894-069X

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✦ Synopsis

Abstract

We consider a system that depends on a single vital component. If this component fails, the system life will terminate. If the component is replaced before its failure then the system life may be extended; however, there are only a finite number of spare components. In addition, the lifetimes of these spare components are not necessarily identically distributed. We propose a model for scheduling component replacements so as to maximize the expected system survival. We find the counterintuitive result that when comparing components' general lifetime distributions based on stochastic orderings, not even the strongest ordering provides an a priori guarantee of the optimal sequencing of components. Β© 2008 Wiley Periodicals, Inc. Naval Research Logistics, 2008

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