期刊
INTERNATIONAL JOURNAL OF SYSTEMS SCIENCE-OPERATIONS & LOGISTICS
卷 10, 期 1, 页码 -出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/23302674.2023.2180690
关键词
Spare unit ordering; replacement; minimal repair; random working time; optimisation
This paper investigates an ordering-replacement modelling framework for a system deteriorating with repairable and unrepairable failures. The objective is to optimize system availability, expected cost rate, and cost-effectiveness by finding the optimal spare unit ordering schedule. The existence and uniqueness of each optimal ordering policy are derived analytically and computed numerically.
In this paper, we investigate an ordering-replacement modelling framework for a system deteriorating with two failure types: a repairable failure (Type-I failure) and an unrepairable failure (Type-II failure). Repairable failures are followed by minimal repair, whereas unrepairable failures are removed by a corrective replacement. A spare unit ordered regularly is associated with the system's operation time T and the number N of successive working times for preventive replacement, or ordered in emergency at any unrepairable failure for corrective replacement, whichever is first to happen. Three kinds of objectives - system availability, expected cost rate, and cost-effectiveness - are optimised to seek for the optimal spare unit ordering schedule (T*, N*), respectively. The existence and uniqueness of each optimal ordering policy are derived analytically and computed numerically.
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