Effects analysis of suspension parameters, different wheel conicities and wheel nominal rolling radii on the derailment safety and ride comfort Online publication date: Thu, 03-Sep-2020
by Yung-Chang Cheng; Po-Hsien Wu
International Journal of Heavy Vehicle Systems (IJHVS), Vol. 27, No. 4, 2020
Abstract: Using a modified heuristic nonlinear creep model with different wheel conicities and nominal rolling radii, a 31 degrees-of-freedom railway vehicle system with rail irregularities in the lateral and vertical directions is modelled and analysed. The effect of suspension system parameters, different wheel conicities and nominal rolling radius on the derailment quotient, the offload factor and the ride comfort index are illustrated and compared. Generally, the derailment risk is underestimated and ride comfort is overestimated when the linear creep model is used for dynamic analysis of a railway vehicle system. The derailment risk is increased and the ride comfort performance is decreased when a worn wheel that has a different wheel nominal rolling radius is used. Finally, for a softer primary and secondary suspension system, the derailment risk for a worn wheel is also increased.
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