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A new derailment coefficient considering dynamic and geometrical effects of a single wheelset

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Abstract

A new derailment coefficient of a single wheelset was theoretically developed by considering the dynamic and geometric effects from lateral acceleration and gyro factors as well as mechanical factors like flange angle, frictional coefficient, wheel-unloading, wheel radius, track gauge and position of axle bearings. This new derailment coefficient (lateral force over vertical wheel load, P/Q) can predict the commencement of various derailments, such as wheel climbing and lifting types, roll-over types and their combined types. In addition, this derailment coefficient can analyze the various dynamic and geometrical effects of a wheelset, which are not considered in the conventional derailment coefficients of Nadal’s and Weinstock’s formulas. This derailment coefficient was verified by comparing its theoretical anticipations of several examples with numerical simulation results using a commercial dynamic S/W, RecurDyn.

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Author information

Authors and Affiliations

  1. Department of Rolling Stock System, Seoul National University of Science and Technology, 172 Gongreung 2-dong, Nowon-gu, Seoul, Korea

    Jeong Seo Koo & Hyun Suk Oh

Authors
  1. Jeong Seo Koo
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  2. Hyun Suk Oh
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Corresponding author

Correspondence to Jeong Seo Koo.

Additional information

Recommended by Associate Editor Cheolung Cheong

Koo Jeong-Seo received his M.S. and doctor degrees in mechanical engineering from KAIST, KOREA, in 1987 and 1995, respectively. Now he is a professor in graduate school of railway, seoul national university of science and technology, Korea. He is interested in the areas of crash safety &vehicle structural mechanics and so on.

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Koo, J.S., Oh, H.S. A new derailment coefficient considering dynamic and geometrical effects of a single wheelset. J Mech Sci Technol 28, 3483–3498 (2014). https://doi.org/10.1007/s12206-014-0809-8

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  • DOI: https://doi.org/10.1007/s12206-014-0809-8

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