Evaluation of Optimal Time Between Overhaul Period of the First Driving Devices for High-Speed Railway Vehicle

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;

Abstract
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: $\small{1.8{\times}10^6km}$, TBO of TM: $\small{2.5{\times}10^6km}$). 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 $\small{2.25{\times}10^6}$km, which is reduced to about 14% comparing the conventional method.
Keywords
fault tree analysis;failure rate;time between overhaul;traction motor;motor reduction gears unit;
Language
Korean
Cited by
References
1.
S. H. Ahn, K. W. Chung, S. H. Jang and C. S. Kim, "Durability Evaluation of the Korean Gauge-Adjustable Wheelset System", Journal of the Korea Academia-Industrial Cooperation Society, Vol.13, No.12, pp.5669-5675, 2012. DOI: http://dx.doi.org/10.5762/KAIS.2012.13.12.5669

2.
C. S. Kim and G. H. Kang, "Fatigue Analysis of Reduction Gears Unit in Rolling Stock Considering Operating Characteristics", Journal of the Korea Academia-Industrial Cooperation Society, Vol.12, No.3, pp.1085-1090, 2011. DOI: http://dx.doi.org/10.5762/KAIS.2011.12.3.1085

3.
D. G. Lee, J. W. Kim and H. S. Lee, "A Case Study on Determining Doors Maintenance Intervals through Running Fault Data Analysis for Metro EMU" Journal of the Korean Society for Railway, Vol.26, No.2, pp.1-8, March, 2003.

4.
I. S. Chung, K. W. Lee and J. W. Kim, "Study on Setting up the Quantitative RAM Goals for Rolling Stocks", Journal of the Korean Society for Railway, Vol.11, No.4, pp.390-397, June, 2008.

5.
Y. H. Yu and N. Y. Lee, "A Study on Reliability Centered Rolling Stock Maintenance Methods" Journal of the Korean Society for Railway, Vol.16, No.3, pp.183-188, June, 2013. DOI: http://dx.doi.org/10.7782/JKSR.2013.16.3.183

6.
G. H. Kang, "Maintenance of High Speed Rail Vehicles: Theory and Practice", Samsung Publishing, 2009.

7.
T. Nakagawa and M. Kowada, "Analysis of a System with Minimal Repair and Its Application to Replacement Policy", European Journal of Operational Research, Vol. 12, No. 2, pp.176-182, 1983. DOI: http://dx.doi.org/10.1016/0377-2217(83)90221-7

8.
Ministry of Land, Infrastructure and Transport of Korean government, "Railroad Core Component/Device Technology Deveolpment Phase 2", Report-15RTRPB084184, 2014.

9.
Military standard, "Procedures for Preforming a Failure Mode, Effects and Criticality Analysis", MIL-STD- 1629A, 1980.

10.
ReliaSoft, "Weibull ++7", ReliaSoft User's Guide, 2005.

11.
E. G. Shopova and N.G. Vaklieva-Bancheva, "BASIC-A Genetic Algorithm for Engineering Problems Solution", Computers and Chemical Engineering, Vol. 30, No. 8, pp. 1293-1309, 2000. DOI: http://dx.doi.org/10.1016/j.compchemeng.2006.03.003