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Optimal Preventive Maintenance Policy with Cost-dependent Improvement Factor  

Hong, Seok-Soo (Technology Evaluation Team, Defense Agency for Technology and Quality)
Park, Jong-Hun (Department of Industrial Engineering, Seoul National University)
Lie, Chang-Hoon (Technology Evaluation Team, Defense Agency for Technology and Quality)
Publication Information
Journal of Korean Institute of Industrial Engineers / v.36, no.2, 2010 , pp. 108-116 More about this Journal
Abstract
The maintenance of a deteriorating system is often imperfect. Previous studies have shown that the imperfect preventive maintenance (PM) can reduce the wear out and aging effects of deteriorating systems to a certain level between the conditions of as good as new and as bad as old. In this paper, we employ the concept of the improvement factor in investigating two optimal PM policies; failure limit policy and periodic PM policy. We redefine the improvement factor model as a function of the cost of PM, using this concept, we derive the conditions of optimal PM policies and formulate expressions to compute the expected cost rate. Based on this information, the determination of the maintenance policies which minimize the cost rate is examined. Numerical examples for the Weibull distribution case are also given.
Keywords
Preventive Maintenance; Improvement Factor; Periodic PM Policy; Failure Limit PM Policy;
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