Journal of the Korean Society for Railway (한국철도학회논문집)

The Korean Society for Railway (한국철도학회)
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Study on MFL Technology for Defect Detection of Railroad Track Under Speed-up Condition

증속에 따른 누설자속기반 철도레일 결함탐상 기술 적용성 검토

  • Kang, Donghoon (Advanced Materials Research Team, Korea Railroad Research Institute) ;
  • Oh, Ji-Taek (Global Marketing Division, Korea Railroad Research Institute) ;
  • Kim, Ju-Won (Department of Convergence Engineering for Future City, Sungkyunkwan University) ;
  • Park, Seunghee (School of Architectural, Civil & Environmental Engineering, Sungkyunkwan University)
  • Received : 2015.04.24
  • Accepted : 2015.08.12
  • Published : 2015.10.31
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Abstract

Defects generated in a railroad track that guides the railroad vehicle have the characteristic of growing fast; as such, the detection technology for railroad track defects is very important because defects can eventually cause mass disasters like derailments. In this study, a speed-up test facility was fabricated to investigate the feasibility of using magnetic flux leakage (MFL) technology for defect detection in a railroad track under speed-up condition; a test was conducted using a railroad track specimen with defects. For this purpose, an MFL sensor head dedicated to the configuration of the railroad was designed and test specimens with artificial defects on their surfaces were manufactured. Using the test facility, a speed-up test ranging from 4km/h to 12km/h was performed and defects including locations were successfully detected from MFL signals induced by defects with enhanced visibility by differentiating raw MFL signals. In the future, it should be possible to apply this system to a high-speed railroad inspection car by improving the lift-off stability that is necessary for speed-up of the developed MFL sensor system.

철도에서 차량의 가이드 역할을 하는 레일에 결함이 발생할 경우 빠르게 진전하는 특성이 있으며 차량의 탈선과 같은 대형사고로 이어질 수 있어 레일 결함 탐상 기술은 매우 중요하다. 본 연구에서는 증속에 따른 누설자속기반 철도레일 결함탐상 기술의 적용성 검토를 위해 증속이 가능한 레일 탐상 시험 장치 제작 및 결함 레일 시편에 대한 탐상 시험을 수행하였다. 이를 위해, 철도레일 형상에 맞는 센서부 및 자화부를 설계하였고 인공결함을 갖는 결함 레일 시편을 제작하였다. 제작된 시험 장치를 이용해 4km/h에서 12km/h까지 속도를 증가시키며 결함에 의해 생성되는 누설자속을 측정하였고 원 신호의 미분을 통한 가시성 향상으로 결함 판별 및 결함 위치를 성공적으로 확인하였다. 향후 리프트 오프 유지 등 고속화에 필요한 점을 보완할 경우 고속 검측차에도 적용가능 할 것으로 생각된다.

Keywords

References

  1. K.S. Song, S.H. Han, Y.S. Choi (2014) Wheel/rail contact analysis with consideration of friction and torque, Journal of the Korean Society for Railway, 17(1), pp. 14-18. https://doi.org/10.7782/JKSR.2014.17.1.14
  2. S.Y. Kong, D.Y. Sung (2014) The fatigue life evaluation of continuous welded rail on a concrete track in an urban railway, Journal of the Korean Society for Railway, 17(3), pp. 193-200. https://doi.org/10.7782/JKSR.2014.17.3.193
  3. S.W. Han, S.H. Cho (2011) Review of non-destructive evaluation technologies for rail inspection, Journal of the Korean Society for Nondestructive Testing, 31(4), pp. 398-413.
  4. S.W. Han, S.H. Cho, J.W. Kim, T.H. Heo (2012) Research on the non-contact detection of internal defects in a rail using ultrasonic waves, Transactions of the Korean Society for Nosie and Vibration Engineering, 22(10), pp. 1010-1019. https://doi.org/10.5050/KSNVE.2012.22.10.1010
  5. J. Park, J. Park (2014) Identification of structural defects in rail fastening systems using flexural wave propagation, Journal of the Korean Society for Nondestructive Testing, 34(1), pp. 38-43. https://doi.org/10.7779/JKSNT.2014.34.1.38
  6. S. Park (2013) Nondestructive evaluation technique for continuum structures using non-contact magnetic flux leakage(MFL) measurement, Journal of the Korean Society for Nondestructive Testing, 33(1), pp. 96-101.
  7. D. Kang, S. Park, J. W. Kim, S. Y. Park (2014) Non-contact local fault detection of railroad track using MFL technology, Journal of the Korean Society of Hazard Mitigation, 14(5), pp. 275-282. https://doi.org/10.9798/KOSHAM.2014.14.5.275
  8. M.H. Kim, Y. W. Rho, D. H. Choi (2010) Pipeline defects detection using MFL signals and Self Quotient Image, Journal of the Korean Society for Nondestructive Testing, 30(4), pp. 311-316.
  9. H.W. Jeong, K. Seo, S. Park (2005) Research of corrosion decision on a region weld in MFL system, Proceedings of the Summer Confer ence of the Korean Institute of Electrical Engineers, Phoenix resort, Pyeong Chang, pp. 978-980.
  10. J.W. Kim, J.S. Choi, E.C. Lee, S.H. Park (2014) Field application of a cable NDT system for cable-stayed bridge using MFL sensors integrated climbing robot, Journal of the Korean Society for Nondestructive Testing, 34(1), pp. 60-67. https://doi.org/10.7779/JKSNT.2014.34.1.60
  11. Y.K. Shin, W. Lord (1993) Numerical modeling of moving probe effects for electromagnetic NDE, IEEE Transaction on Magnetics, 29(2), pp. 1865-1868. https://doi.org/10.1109/20.250770
  12. Y.K. Shin (1997) Numerical Prediction of Operating Conditions for Magnetic Flux Leakage Inspection of Moving Steel Sheets, IEEE Transaction on Magnetics, 33(2), pp. 2127-2130. https://doi.org/10.1109/20.582751
  13. Y.S. Sun, W. Lord, G. Katragadda, Y.K. Shin (1994) Influences of velocity on signal responses of magnetostatic non-destructive testing tools: a prediction from finite element analysis, IEEE Transaction on Magnetics, 30(5), pp. 3308-3311. https://doi.org/10.1109/20.312645
  14. Z. Chen, J. Xuan, P. Wang, H Wang (2011) Simulation on high speed rail magnetic flux leakage inspection, Proceedings of the Instrumentation and Measurement Technology Conference (I2MTC), pp. 1-5.
  15. P. Wang, Y. Gao, G.Y. Tian, H. Wang (2014) Velocity effect analysis of dynamic magnetization in high speed magnetic flux leakage inspection, NDT & E International, 64(1), pp. 7-12. https://doi.org/10.1016/j.ndteint.2014.02.001
  16. J. Jun, M. Choi, J. Lee, J. Seo, et al. (2011) Nondestructive testing of express train wheel using the linearly integrated Hall sensors array on a curved surface, NDT & E International, 44(5), pp. 449-455. https://doi.org/10.1016/j.ndteint.2011.04.005
  17. D.R. Son (1997) Principles and applications of magnetic sensor, Journal of the Korean Magnetics Society, 7(6), pp. 334-339.
  18. E. Ramsden (2006) Hall-effect sensors : theory and application, Newnes, Oxford, U.K., pp. 1-272.