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A Study on the Maintenance Policy Considering the Failure Data of the EMU Braking System and the Cost Function
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 Title & Authors
A Study on the Maintenance Policy Considering the Failure Data of the EMU Braking System and the Cost Function
Han, Jae-Hyun; Kim, Jong-Woon; Koo, Jeong-Seo;
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Railway vehicle equipment goes back again to the state just before when failure by the repair. In repairable system, we are interested in the failure interval. As such, a statistical model of the point process, NHPP power law is often used for the reliability analysis of a repairable system. In order to derive a quantitative reliability value of repairable system, we analyze the failure data of the air brake system of the train line 7. The quantitative value is the failure intensity function that was modified, converted into a cost-rate function. Finally we studied the optimal number and optimal interval in which the costs to a minimum consumption point as cost-rate function. The minimum cost point was 194,613 (won/day) during the total life cycle of the braking system, then the optimal interval were 2,251days and the number of optimal preventive maintenance were 7 times. Additionally, we were compared to the cost of a currently fixed interval(4Y) and the optimum interval then the optimal interval is 3,853(won/day) consuming smaller. In addition, judging from the total life, "fixed interval" is smaller than 1,157 days as "optimal interval".
repairable system;point process;NHPP;power law model;preventive maintenance;cost rate function;
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