The effects of water lubrication condition between wheel and rail on the dynamic response of high-speed railway vehicle-bridge coupling system

被引：0
|
作者：
Zhou Z. [1 ,2 ,3 ]
Shen H. [1 ]
Cai C. [1 ,2 ,3 ]
Zhu X. [1 ]
机构：
[1] School of Civil Engineering, Central South University, Changsha
[2] National Engineering Research Center for High-speed Railway Construction, Central South University, Changsha
[3] Hunan Provincial Key Laboratory for Disaster Prevention and Mitigation of Rail Transit Engineering Structures, Central South University, Changsha
来源：
Journal of Railway Science and Engineering | 2023年 / 20卷 / 02期
关键词：
adhesion coefficient; dynamic response; singly-support box girder; vehicle-bridge coupled system; water condition;
D O I：
10.19713/j.cnki.43-1423/u.T20220417
中图分类号：
学科分类号：
摘要：
In the process of train operation, the low wheel/rail adhesion under the condition of water medium will directly affect the traction, braking and curve passing capacities of trains, especially for high-speed trains, and affect the dynamic response of the bridge. To ensure the running safety of the high-speed trains, it is essential to study the high-speed wheel/rail adhesion effects on vehicle-bridge dynamic response in detail. By taking the highspeed trains and concrete simply-supported box girder bridges as the research object, based on the bridge structure finite element model established by ANSYS software and the vehicle model and wheel/rail model established by SIMPACK software, the train-rail-bridge coupling vibration co-simulation models with 32 m bridge span under the water conditions were established through the relationship between vehicle and bridge subsystems. The wheel/rail adhesion coefficients under dry and water conditions were measured by carrying out laboratory tests using an improved MJP-40 micro-controlled testing apparatus. The track irregularity samples generated by the German high-speed low interference track irregularity spectra were chosen as the initial excitation of the train-bridge coupling system, the train vibration acceleration, wheelset lateral displacement, derailment coefficient and the dynamic response (displacement and acceleration) of bridges were selected as evaluation indices, the influence of dynamic response of bridges and running safety of trains under different train speeds and adhesion coefficients were studied through numerical simulations. The results indicate that with the improvement of the running speed under dry condition, the dynamic responses of the train-bridge system increase accordingly, but all these indices are within the limits of existing specifications. Compared with the dry condition, the wheel/rail adhesion coefficient under the water condition decreases by about 52.6%. The low adhesion coefficient under the water condition could reduce the train vibration acceleration, derailment coefficient and the bridge lateral vibration acceleration. © 2023, Central South University Press. All rights reserved.
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页码：405 / 411
页数：6
相关论文
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