Running stability simulation and field testing of two-axle bogie design Online publication date: Fri, 15-Aug-2003
by You-Min Huang, Tsung-Shou Wang
International Journal of Vehicle Design (IJVD), Vol. 26, No. 2/3, 2001
Abstract: Running stability, which limits the maximum safe operating speed of the EMU (Electrical Multiple Unit), largely relies on longitudinal suspension stiffness. However, the longitudinal suspension impairs the steering ability of the rigid railway wheel-sets having conical or profiled-wheel treads on curved track. This limitation is felt particularly in EMUs designed for high operating speeds. This study utilises the multi-body program MEDYNA to explore the running stability of a two-axle bogie design through simulation. Considered herein are the relation of critical speed and conicity, also the damping ratio through 2D and 3D analyses. Field test results are examined to find the lateral displacement of the wheel and the bogie swing angle in order to determine running stability. Hence, the design prediction and field test confirmation of running stability behaviour are studied to further understand one of the most fundamental factors to be considered in the design and engineering development of a bogie.
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