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Dynamic behaviors and mitigation measures of a train passing through windbreak transitions from ground to cutting

列车通过平地至路堑挡风墙过渡区域的动态行为及缓解措施

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Abstract

In this paper, the effects of a right-angle windbreak transition (RWT) from the flat ground to cutting on train aerodynamic and dynamic responses were investigated, then a mitigation measure, an oblique structure transition (OST) was proposed to reduce the impact of RWT on the train aerodynamic and dynamic performance. The results showed that in the RWT region, the airflow was divided into two parts. One part of the airflow induced a strong backflow in the flat ground position, and the other part of the airflow induced a strong backflow in the cutting position. Therefore, there were two lateral impacts on the train. For the head car with the OST, the drop ratios of the peak-to-peak values compared with RWT were 47%, 40%, and 52% for the side force coefficient CFy, lift force coefficient CFz and overturning moment coefficient CMx, respectively. For the peak-to-peak value of the dynamic parameters, the drop ratios of OST compared with RWT were all larger than 50%. The maximum dynamic overturning coefficients for RWT and OST were 0.75 and 0.3, respectively.

摘要

本文研究了大风环境下从平地至路堑的直角挡风墙过渡区域对列车空气动力学和系统动力学响应的影响, 提出一种斜切过渡缓解措施来减小原始挡风墙过渡对列车气动和动力学性能的影响。 结果表明, 由于直角挡风墙过渡的影响, 来流风场在线路内被分为两部分, 一部分在平地位置引起强烈回流, 另一部分在路堑位置引起强烈回流。 因此, 列车经过挡风墙过渡区域时受到了两次横向冲击。 采用挡风墙斜切过渡后, 头车侧向力系数、升力系数和倾覆力矩系数与原始挡风墙过渡相比, 峰峰值分别下降了47%、40%和52%。 对于车辆系统动力学响应参数的峰峰值, 挡风墙斜切过渡相比原始过渡降幅均超过50%, 其中原始挡风墙过渡和缓解措施下的列车动力学倾覆系数分别为0.75和0.3。

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China

    Zheng-wei Chen  (陈争卫)

  2. Key Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South University, Changsha, 410075, China

    Zheng-wei Chen  (陈争卫), Tang-hong Liu  (刘堂红), Zi-jian Guo  (郭子健), Xiao-shuai Huo  (霍小帅), Wen-hui Li  (李文辉) & Yu-tao Xia  (夏玉涛)

  3. Joint International Research Laboratory of Key Technology for Rail Traffic Safety, Changsha, 410075, China

    Tang-hong Liu  (刘堂红), Zi-jian Guo  (郭子健), Xiao-shuai Huo  (霍小帅), Wen-hui Li  (李文辉) & Yu-tao Xia  (夏玉涛)

  4. National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle, Changsha, 410075, China

    Tang-hong Liu  (刘堂红), Zi-jian Guo  (郭子健), Xiao-shuai Huo  (霍小帅), Wen-hui Li  (李文辉) & Yu-tao Xia  (夏玉涛)

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  1. Zheng-wei Chen  (陈争卫)
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Contributions

CHEN Zheng-wei provided the concept and edited the draft of the manuscript. LIU Tang-hong conducted the experimental validation. GUO Zi-jian and HUO Xiao-shuai edited the draft of manuscript. LI Wen-hui and XIA Yu-tao analyzed the collected data. All authors replied to reviewers’comments and revised the final version.

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Correspondence to Zi-jian Guo  (郭子健).

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Conflict of interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Foundation item: Project(2020YFA0710903) supported by the National Key R&D Program of China;Project(U1334205) supported by the National Natural Science Foundation of China;Project(1-W16W) supported by the Hong Kong Polytechnic University’s Postdoc Matching Fund Scheme, China

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Chen, Zw., Liu, Th., Guo, Zj. et al. Dynamic behaviors and mitigation measures of a train passing through windbreak transitions from ground to cutting. J. Cent. South Univ. 29, 2675–2689 (2022). https://doi.org/10.1007/s11771-022-5114-6

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