Study on the wheel/rail interaction and derailment safety

The wheel flange climb derailment and wheel impact derailment are studied. Firstly, it is assumed that the wheel flange climb process is quasi-static, then the flange climb derailment criteria are derived through analyzing the forces exerted on the wheelset. One criterion is the classical derailment formula that assumes friction sliding between wheel and rail occurs. Another is the so-called approximate analytical formula that considers the effect of wheel/rail creep forces. The calculations of an example indicate that the results of the classical method are more conservative compared with the results of the analytic method for the diagnosis of wheelset derailment. The laboratory test for the flange climb derailment with a single wheelset test stand is also undertaken to validate the theoretical analysis. Secondly, the wheel impact derailment, a kind of dynamic derailment, is investigated. The analytic solutions for the tangential motion of the wheel/rail contact point and the jumping height of the wheel are derived. The derailment criteria by using the wheel jumping height and the lateral impact force to wheel vertical load ratio are given. The influences of wheelset lateral impact velocity, flange angle, wheel/rail friction coefficient, wheel vertical load and impact time interval on wheelset derailment are analyzed.

[1]  Mohammad Durali,et al.  Nonlinear Analysis of Train Derailment in Severe Braking , 2003 .

[2]  J. Rismantab-Sany.  Another look at the single wheel derailment criteria , 1996, Proceedings of the 1996 ASME/IEEE Joint Railroad Conference.

[3]  Hiroaki Ishida,et al.  Safety Criteria for Evaluation of Railway Vehicle Derailment. , 1999 .

[4]  Takashi Yamamoto,et al.  A Fundamental Study on Derailment of Wheel Flange Under Rolling-Sliding and Pure Sliding Conditions , 2005 .

[5]  John A. Elkins,et al.  ANGLE OF ATTACK AND DISTANCE-BASED CRITERIA FOR FLANGE CLIMB DERAILMENT , 1999 .

[6]  Roberto Spinola Barbosa.  A 3D Contact Force Safety Criterion for Flange Climb Derailment of a Railway Wheel , 2004 .

[7]  K Nagase,et al.  A study of the phenomenon of wheel climb derailment: Results of basic experiments using model bogies , 2002 .

[8]  K Yokose,et al.  A THEORY OF THE DERAILMENT OF WHEELSET , 1966 .

[9]  A. O. Gilchrist,et al.  A Re-Examination of the Proneness to Derailment of a Railway Wheel-Set: , 1976 .

[10]  V K Garg,et al.  Dynamics of railway vehicle systems , 1984 .

[11]  X Jun,et al.  A study on mechanical mechanism of train derailment and preventive measures for derailment , 2005 .

[12]  Hiroaki Ishida,et al.  Derailment Safety Evaluation by Analytic Equations , 2002 .

[13]  J. K. Hedrick,et al.  A Comparison of Alternative Creep Force Models for Rail Vehicle Dynamic Analysis , 1983 .

[14]  Giorgio Diana,et al.  Experimental and numerical investigation on the derailment of a railway wheelset with solid axle , 2006 .