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A Study on Cost Optimization of Preventive Maintenance for the Second Driving Devices for Korea Train Express
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 Title & Authors
A Study on Cost Optimization of Preventive Maintenance for the Second Driving Devices for Korea Train Express
Jung, Jin-Tae; Kim, Chul-Su;
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Although the second driving device of KTX, which consists of the wheel and the axle reduction gears unit, is a mechanically integrated structure, its preventive maintenance (PM) requires two separate intervals due to the different technical requirements. In particular, these subsystems perform attaching and detaching work simultaneously according to the maintenance directive. Therefore, to reduce the unnecessary amount of PM and high logistic availability of the train, it is important to optimize PM with regard to reliability-centered maintenance toward a cost-effective solution. In this study, fault tree analysis and reliability of the subsystems, considering the criticality of the components, were performed using the data derived from field data in maintenance. The cost optimization of the PM was derived from a genetic algorithm considering the target reliability and improvement factor. The cost optimization was derived from a maximum of the fitness function of the individual in generation. The optimal TBO of them using the genetic algorithm was 2.85x106 km, which is reduced to approximately 21% compared to the conventional method.
axle reduction unit;preventive maintenance;reliability;wheel;
 Cited by
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