A Study on Analysis Method Considering Camber for the Carbody Deflection of the Urban Transit Vehicles

Abstract:

The carbody structure of electric multiple unit (here in after EMU) shall be designed withstand the loading conditions without permanent deformation or any form of damage. And the carbody shall have a minimum design life of 25 years or more in Korea. Loading conditions have a longitudinal compressive force and a vertical load. Camber of the carbody is defined as its curved shape viewed in side elevation. Carbody camber shall be a smooth arc from end to end of the carbody and shall be measured from a datum line drawn between the intersections of the arc with the center lines of the carbody bolsters to a line tangent to the arc midway between bolsters. The carbody shall be built with positive camber such that camber shall remain positive with the carbody at maximum load and shall not bind due to deflection caused by variations of service load. To assess the strength and stiffness of the designed carbody, carbodys designer shall be demonstrated by a programme of finite element analysis and testing shall be carried out in accordance with Korean standard technical specifications. The carbody is manufactured by giving the slope of the deflection to be compensated strength and stiffness. The deflection is camber. So this study analyzes that how camber affects safety and durability of carbody according to the load conditions and revenue service on main-line. Methods and analytical model of carbody structure is introduced to demonstrate them.

• Periodical: Advanced Materials Research (Volume 871)
• Pages: 323-329
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.871.323
• Online since: December 2013
• Authors: Jong Duk Chung*, Jang Sik Pyun
• Keywords: Camber, Deflection of Carbody, Structural Analysis, Urban Transit

References

[1] Kumaran, M.S., Kumar, R.K. and Sriraman, R, 2000, Finite element simulation of the railway coach shell assembly process, Proc. Instn. Mech. Engrs, Vol. 214 Part B, p.581∼592.

DOI: 10.1243/0954405001518279

[2] C. K. Park, Y. G. Kim, D. S. Bae(2002), Analysis of vehicle limit considering the dynamic behavior for an urban train, Transactions of the Korean Society for Noise and Vibration Engineering, v. 12, no. 7, pp.527-533.

DOI: 10.5050/ksnvn.2002.12.7.527

[3] H. J. Yang, K. W. Lee, K. B. Park(2002), A study on the kinematic envelope of the railway vehicle, 2002 Proceedings of the KSR Conference(2), pp.863-869.

[4] H. K. Jun, D. H. Lee, J. C. Kim, C. W. Lee(2008), Fatigue life evaluation of diesel locomotive car body considering camber effect, 2008 Proceedings of the KSME Conference A, pp.372-377.

[5] Minister of Land, Transport and Maritime Affairs(2008), Enforcement rule on safety standards for urban railway vehicles.

[6] Virtual Motion, DAFUL 3. 3 Program Manual, (2010).

[7] J. D. Chung et al. (2008), The study on maintenance and development of urban rolling stock standardization, Korea Railroad Research Institute.