As train speeds increase and operating environments diversify, the issue of abnormal vibration of tail car in high-speed train has become a significant threat to operational stability and safety. In this study, numerical simulation was employed to develop aerodynamic and multi-body dynamics models for 3-car and 8-car train formations. Using the proper orthogonal decomposition method for reduced-order analysis, the research has examined the unsteady flow field distribution, surface pressure, and aerodynamic performance of the train cars at speeds of 200, 300, and 400 km/h, and the aerodynamic optimization was achieved by installing bogie skirts to improve the vehicle stability. The results indicate that the pressure fluctuation regions contributing to lateral aerodynamic loadings vibration are concentrated on the sidewalls near the bogie cabins at heights of z = 0.0 m to 0.8 m. The installation of bogie skirts optimizes the pressure mode distribution and the amplitude of temporal coefficients at these locations, effectively reducing the intensity of lateral aerodynamic loadings. Additionally, the main frequency of the loadings has been increased, thereby avoiding the possibility of resonance caused by aerodynamic loadings frequencies approaching the vehicle suspension's natural frequency. Across all three speed levels, varying degrees of tail car stability improvement were observed. In particular, at 400 km/h, the lateral and vertical Sperling indices were reduced by 6.96% and 9.41%, respectively, effectively mitigating the abnormal vibration in the tail car of long-formation trains caused by aerodynamic loadings during operations.
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January 2025
Research Article|
January 03 2025
Mitigation of abnormal vibration on high-speed trains under unsteady aerodynamic loadings using bogie skirts
Special Collection:
Flow and Civil Structures
Yifan Li (李一凡)
;
Yifan Li (李一凡)
(Data curation, Formal analysis, Investigation, Methodology, Project administration, Software, Writing – original draft)
State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University
, Chengdu 610031, China
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Tian Li (李田)
;
Tian Li (李田)
a)
(Conceptualization, Funding acquisition, Writing – review & editing)
State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University
, Chengdu 610031, China
a)Author to whom correspondence should be addressed: [email protected]
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Jiye Zhang (张继业)
Jiye Zhang (张继业)
(Funding acquisition, Resources)
State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University
, Chengdu 610031, China
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a)Author to whom correspondence should be addressed: [email protected]
Physics of Fluids 37, 015137 (2025)
Article history
Received:
October 18 2024
Accepted:
November 26 2024
Citation
Yifan Li, Tian Li, Jiye Zhang; Mitigation of abnormal vibration on high-speed trains under unsteady aerodynamic loadings using bogie skirts. Physics of Fluids 1 January 2025; 37 (1): 015137. https://doi.org/10.1063/5.0244409
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