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Evaluation of Optimal Time Between Overhaul Period of the First Driving Devices for High-Speed Railway Vehicle
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 Title & Authors
Evaluation of Optimal Time Between Overhaul Period of the First Driving Devices for High-Speed Railway Vehicle
Jung, Jin-Tae; Kim, Chul-Su;
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The first driving device of the power bogies for the Korean high-speed railway vehicle consists of the traction motor (TM) and the motor reduction gears unit (MRU). Although TM and MRU are the mechanically integrated structures, their time between overhauls (TBO) have two separate intervals due to different technical requirements(i.e. TBO of MRU: , TBO of TM: ). Therefore, to reduce the unnecessary number of preventive maintenances, it is important to evaluate the optimal TBO with a viewpoint of reliability-center maintenance towards cost-effective solution. In this study, derived from the field data in maintenance, fault tree analysis and failure rate of the subsystem considering criticality of the components are evaluated respectively. To minimize the conventional total maintenance cost, the same optimal TBO of the components is derived from genetic algorithm considering target reliability and improvement factor. In this algorithm, a chromosome which comprised of each individual is the minimum preventive maintenance interval. The fitness function of the individual in generation is acquired through the formulation using an inverse number of the total maintenance cost. Whereas the lowest common multiple method produces only a four percent reduction compared to what the existing method did, the optimal TBO of them using genetic algorithm is km, which is reduced to about 14% comparing the conventional method.
fault tree analysis;failure rate;time between overhaul;traction motor;motor reduction gears unit;
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