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Study of Influence of Wheel Unloading on Derailment Coefficient of Rolling Stock

철도차량의 윤중 감소가 탈선계수에 미치는 영향 연구

  • Koo, Jeong Seo (Department of Rolling Stock System, Seoul National University of Science and Technology) ;
  • Oh, Hyun Suk (Department of Rolling Stock System, Seoul National University of Science and Technology)
  • 구정서 (서울과학기술대학교 철도차량시스템공학과) ;
  • 오현석 (서울과학기술대학교 철도차량시스템공학과)
  • Received : 2012.06.19
  • Accepted : 2012.09.28
  • Published : 2013.02.04

Abstract

A new theoretical derailment coefficient model of wheel-climb derailment is proposed to consider the influence of wheel unloading. The derailment coefficient model is based on the theoretical derailment model of a wheelset that was developed to predict the derailment induced by train collisions. Presently, in domestic derailment regulations, a derailment coefficient of 0.8 is allowable using Nadal's formula, which is for a flange angle of $60^{\circ}$ and a friction coefficient of 0.3. However, theoretical studies focusing on different flange angles to justify the derailment coefficient of 0.8 have not been conducted. Therefore, this study theoretically explains a derailment coefficient of 0.8 using the proposed derailment coefficient model. Furthermore, wheel unloading of up to 50% is accepted without a clear basis. Accordingly, the correlation between a wheel unloading of 50% and a derailment coefficient of 0.8 is confirmed by using the proposed derailment coefficient model. Finally, the validity of the proposed derailment coefficient model is demonstrated through dynamic simulations.

Keywords

Derailment Coefficient;Nadal's Formula;Wheelset;Wheel Unloading;Domestic Derailment Regulation;Wheel Load

Acknowledgement

Supported by : 한국연구재단

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