@article{ref1,
title="Optimal age-dependent preventive maintenance policies with imperfect maintenance",
journal="International journal of reliability, quality and safety engineering",
year="1996",
author="Wang, Hao and Pham, Hoai",
volume="3",
number="2",
pages="119-135",
abstract="This paper proposes three age-dependent preventive maintenance models with imperfect repair and/or imperfect preventive maintenance (pm). In these models imperfect repair is treated in a way that after repair the lifetime of a unit will decrease to a fraction of its immediately previous one and its repair time will increase to a multiple of immediately previous one. In this paper, the expected maintenance cost rate and asymptotic average availability are derived with a consideration that the maintenance and repair times are not negligible. The optimum maintenance policies are then determined for the three imperfect maintenance models respectively. A class of related optimization problems is also discussed. Finally, a numerical example is presented to illustrate the results.<p />",
language="",
issn="0218-5393",
doi="10.1142/S0218539396000090",
url="http://dx.doi.org/10.1142/S0218539396000090"
}