Title: Effects analysis of suspension parameters, different wheel conicities and wheel nominal rolling radii on the derailment safety and ride comfort
Authors: Yung-Chang Cheng; Po-Hsien Wu
Addresses: Department of Mechanical and Automation Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, 824, Taiwan ' Department of Mechanical and Automation Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, 824, Taiwan
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.
Keywords: modified heuristic nonlinear creep model; derailment quotient; offload factor; ride comfort; wheel nominal rolling radius; suspension system parameters; wheel conicity.
International Journal of Heavy Vehicle Systems, 2020 Vol.27 No.4, pp.519 - 548
Received: 09 Dec 2016
Accepted: 01 Jan 2018
Published online: 03 Sep 2020 *