Nooshin Salari and Viliam Makis
A ConditionBased Maintenance Policy for MultiUnit Systems Subject to Deterioration
650 - 654
2018
12
6
International Journal of Industrial and Systems Engineering
https://publications.waset.org/pdf/10009132
https://publications.waset.org/vol/138
World Academy of Science, Engineering and Technology
In this paper, we propose a conditionbased
maintenance policy for multiunit systems considering the
existence of economic dependency among units. We consider a
system composed of N identical units, where each unit deteriorates
independently. Deterioration process of each unit is modeled as a
threestate continuous time homogeneous Markov chain with two
working states and a failure state. The average production rate of
units varies in different working states and demand rate of the
system is constant. Units are inspected at equidistant time epochs,
and decision regarding performing maintenance is determined by the
number of units in the failure state. If the total number of units in the
failure state exceeds a critical level, maintenance is initiated, where
units in failed state are replaced correctively and deteriorated state
units are maintained preventively. Our objective is to determine the
optimal number of failed units to initiate maintenance minimizing
the long run expected average cost per unit time. The problem is
formulated and solved in the semiMarkov decision process (SMDP)
framework. A numerical example is developed to demonstrate the
proposed policy and the comparison with the corrective maintenance
policy is presented.
Open Science Index 138, 2018