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http://dx.doi.org/10.3795/KSME-A.2013.37.2.177

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

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)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.37, no.2, 2013 , pp. 177-185 More about this Journal
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;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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