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http://dx.doi.org/10.5762/KAIS.2020.21.9.32

Durability Evaluation on the Air-Braking Release Failure Proof Valve of Cargo Train  

Lee, Jun-Ku (Graduate School, Korea National University of Transportation)
Kim, Chul-Su (School of Railway Engineering, Korea National University of Transportation)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.21, no.9, 2020 , pp. 32-38 More about this Journal
Abstract
Cargo train braking uses the pressure changes in the air braking pipe to operate the braking tightening and releasing service repeatedly. Air-braking release failure means partial braking caused by a failure of the variable load valve after the driver handling the brake release. This phenomenon causes wheel flaws while driving a wagon, resulting in wheel breakage or train derailment. This study developed the air-braking release failure proof valve considering the technical requirements of the railway operation corporations. In addition, a durability test of the valve was carried out using a braking performance simulator, and its operating performance was evaluated from the pneumatic history under cyclic braking conditions. The warranty life of this valve was assessed by performing 160,000 cycles of testing of 12 prototypes in accordance with the zero-failure test method, considering the number of braking cycles while driving the wagon. During the durability test, the pneumatic input time, output time, and release velocity were almost constant. The warranty life of this valve was 59,860 times the 95% confidence level, which means that it can be operated without trouble for four years when the valve is installed in the bogie of the wagon.
Keywords
Air-Braking Release; Cargo Train; Durability; Railway; Warranty Life;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 https://reliabilityanalyticstoolkit.appspot.com/mechanical_reliability_data
2 S. R. Lee, H. E. Kim, "Determination of No-Failure Test Times for the Life Test of Hydraulic System Components ", Journal of Drive and Control, Vol. 3, No. 3, pp. 59-64, 2006.
3 S. H. Kim, A study on improvement of maintenance for freight wagon wheel, Master's thesis, Korea National University of Transportation, Seoul, Korea, pp. 1-20, 2016.
4 S. W. Nam, K. H. Moon, D. H. Lee, "Experimental Study on the Improvement of Release Application Characteristics of Pneumatic Brakes for Freight Train", Journal of Mechanical Science and Technology, Vol. 25, No. 12, pp. 1739-1747, 2001. DOI:http://dx.doi.org/10.22634/KSME-B.2001.25.12.1739
5 C. S. Kim, M. H. Park, "Durability Evaluation on Doorstep Equipments Used for Low and High Level Platforms at Railway Vehicle", Journal of the Korea Academia-Industrial, Vol. 13, No. 9, pp. 3889-3894, 2012. DOI:http://dx.doi.org/10.5762/KAIS.2012.13.9.3889
6 S. W. Nam, "A Study on the Improvement of Release Application Characteristics of Pneumatic Brakes for Freight Train", Journal of Mechanical Science and Technology, Vol. 16, No. 6, pp. 776-78, 2002. DOI: http://dx.doi.org/10.1007/BF02939337
7 G. H. Kang, "Durability Evaluation of Gangway Ring for the Articulated Bogie of High speed Railway Vehicle", Journal of the Korea Academia-Industrial, Vol. 20, No. 5, pp. 66-72, 2019 DOI: http://dx.doi.org/10.5762/KAIS.2019.20.5.66
8 G. H. Kang, C. S. Woo, C. S. Kim, "Durability Evaluation of Gangway Connections for the High Speed Railway Vehicles", Journal of the Korea Academia-Industrial, Vol. 15, No. 8, pp. 4796-4801, 2014. DOI: http://dx.doi.org/10.5762/KAIS.2014.15.8.4796
9 Seoul Railway Vehicle Maintenance Depot, Wagon Maintenance Guide, KORAIL Technical Report, 2000, pp. 20-80.
10 T. H. Lee, "A Study on the Failure and Life Assessment of High Speed Spindle", J. Korean Soc. Precis. Eng., Vol. 31, No. 1, pp. 67-73, 2014. DOI:http://dx.doi.org/10.7736/KSPE.2014.31.1.67   DOI