Dynamic Performance of High-speed Gauge-changeable Railway Vehicle

SHI Huailong, GUO Jinying, WANG Yong
2020 Journal of Mechanical Engineering  
Abstract:The high-speed train change its wheel back-to-back distance to run on tracks with different track gauge, while the wheelaxle clearance and the change in track gauge, rail cant and rail profile would change wheel/rail contact relationship, thus change the vehicle dynamics behavior. The wheel/rail interaction and vehicle behavior of Chinese high-speed railway vehicle with two different wheel treads on the standard-and wide-gauge track system types are stimulated respectively. The
more » ... tively. The equivalent conicity of LMA drops by about 30% when the rail cant changes to 1/20 from 1/40, while LMB 10 is well matched with both rail cant. The conicity of worn treads is more sensitive to the rail cant than the standard ones. Theoretical analysis shows that the hunting frequency of a free wheelset on the standard-and wide-gauge track are equivalent, and it remains the same for a bogie with and without suspension. While numerical simulations state that the running stability of vehicle on wide-gauge track gets slightly worse compared to that on the standard-gauge track, which suffers small amplitude hunting with a 0.6 mm wheel-axle clearance. The wheel-axle clearance has a maximum effect of 9% on the running safety and ride comfort, which can be neglected in usual dynamic analysis. Whereas the running safety and lateral ride comfort get worse by 15% and 38%, respectively, with respect to that on the standard-gauge track due to the larger cant deficiency and worse stability on wide-gauge track. Additionally, the lateral interacting force between the wheel and axle has close amplitude with the wheel/rail contact force but opposite direction, and this leads to the variation in the wheel back-toback distance when running. The rotational clearance of wheel/axle interaction leads to rotation torque on left and right wheel with same amplitude and opposite direction, and it goes contact and separation repeatedly under the influence of longitudinal wheel/rail contact force. It is part of the base to predict and understand the vehicle dynamics behavior of a high-speed gauge-changeable vehicle in field, and the variation of wheel back-to-back distance and clearance forces when running.
doi:10.3901/jme.2020.20.098 fatcat:cbl7xu5u3rclzjx3krhw6mjmc4