A fast simulation algorithm for the wheel profile wear of high-speed trains considering stochastic parameters

With the rapid development of high-speed railways, wheel and rail wear has become increasingly serious due to the acute wheel-rail interaction. During the operation of high speed vehicle, complicated wheel-rail contact force will lead to wheel profile wear, which will worsen the dynamic performance of vehicle system, or even influence the safe operation of vehicles. In order to ensure the vehicle dynamic performance, right now regularly wheel re-profiling has to be adopted. Therefore, the study of wheel profile wear and its effect on vehicle dynamic performance is very important [1,. The purpose of the paper is to study the variation characteristics of vehicle dynamic performance with respect to the wheel profile wear through numerical simulation and field test.

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Investigation of low damped carbody oscillation for Korean high-speed EMU experimental train

Proceedings of the Institution of Mechanical Engineers Part F Journal of Rail and Rapid Transit ◽

10.1177/09544097211008289 ◽

2021 ◽

pp. 095440972110082

Author(s):

Joonhyuk Park

Keyword(s):

High Speed ◽

Damping Ratio ◽

Field Tests ◽

Lateral Movement ◽

Vehicle Model ◽

High Speed Trains ◽

Parametric Studies ◽

Multiple Unit ◽

Wheel Profile ◽

Equivalent Conicity

This study describes the low damped carbody oscillations of the HEMU-430X, a high-speed electric-multiple-unit experimental train of Korea. The HEMU-430X had already undergone a kind of hunting problem in the test period, but it was effectively suppressed through several measures and the test was finished successfully. However, recently, the HEMU-430X again experienced the similar but slightly different problem after its wheel profile was changed to XP55, which is widely used in high-speed trains in Korea. In this paper, the eigenbehavior and system damping ratio are analyzed using a linearized vehicle model to more systematically investigate the cause of the carbody oscillation of the HEMU-430X. The results show that the bogie lateral movement coupled with carbody upper sway has the least damping ratio in the case of the HEMU-430X and the magnitude of yaw directional constraints of the bogie plays an important role in causing the carbody oscillation. Parametric studies for suspension, equivalent conicity and creep coefficients are carried out. A solution is suggested and it is validated using field tests.

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Parameter Studies for Wheel Wear Using a Flexible Wheelset

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.712-715.1230 ◽

2013 ◽

Vol 712-715 ◽

pp. 1230-1234

Author(s):

Na Wu ◽

Jing Zeng

Keyword(s):

High Speed ◽

Wear Depth ◽

Wheel Wear ◽

Wear Model ◽

Wear Performance ◽

Flexible Wheelset ◽

Wheel Profile ◽

Wheel Profile Wear ◽

Multi Body ◽

Equivalent Conicity

In order to reduce wheel profile wear of high-speed train and extend the service life of wheels, a high-speed vehicle multi-body dynamic model and wheel profile wear model are established, in which the wheelset is considered as flexible. The influence of wheel profile, track gauge, and rail cant is extensively studied. The simulation results show that the type XP55 wheel has smallest cumulative wear depth, and type LM wheel has largest wear depth. It is known that the equivalent conicity of the wheel should not be too large or too small. The track gauge with 1435-1438mm and rail cant with 1:35-1:40 can have better wheel wear performance.

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