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考虑梁弯扭耦合对钢轨横向振动特性的影响

豆银玲 韦凯 曹勇 王绍华 亓伟 王平

豆银玲, 韦凯, 曹勇, 王绍华, 亓伟, 王平. 考虑梁弯扭耦合对钢轨横向振动特性的影响[J]. 西南交通大学学报, 2023, 58(5): 1056-1063. doi: 10.3969/j.issn.0258-2724.20210774
引用本文: 豆银玲, 韦凯, 曹勇, 王绍华, 亓伟, 王平. 考虑梁弯扭耦合对钢轨横向振动特性的影响[J]. 西南交通大学学报, 2023, 58(5): 1056-1063. doi: 10.3969/j.issn.0258-2724.20210774
DOU Yinling, WEI Kai, CAO Yong, WANG Shaohua, QI Wei, WANG Ping. Effect of Bending-Torsional Coupling of Beams on Lateral Vibration Characteristics of Rails[J]. Journal of Southwest Jiaotong University, 2023, 58(5): 1056-1063. doi: 10.3969/j.issn.0258-2724.20210774
Citation: DOU Yinling, WEI Kai, CAO Yong, WANG Shaohua, QI Wei, WANG Ping. Effect of Bending-Torsional Coupling of Beams on Lateral Vibration Characteristics of Rails[J]. Journal of Southwest Jiaotong University, 2023, 58(5): 1056-1063. doi: 10.3969/j.issn.0258-2724.20210774

考虑梁弯扭耦合对钢轨横向振动特性的影响

doi: 10.3969/j.issn.0258-2724.20210774
基金项目: 国家自然科学基金(U1734207, 51978583)
详细信息
    作者简介:

    豆银玲(1993—),女,博士研究生,研究方向为道路与铁道工程,E-mail:douyinling@my.swjtu.edu.cn

    通讯作者:

    王平(1969—),男,教授,博士,研究方向为道路与铁道工程,E-mail:wping@home.swjtu.edu.cn

  • 中图分类号: U211.3

Effect of Bending-Torsional Coupling of Beams on Lateral Vibration Characteristics of Rails

  • 摘要:

    为准确预测弹性波在钢轨中的传播,且探究考虑Timoshenko梁弯扭耦合的必要性,基于波谱‒辛混合法建立了考虑梁弯扭耦合的钢轨-扣件空间无限长模型. 在模型验证的基础上,分析考虑Timoshenko梁弯扭耦合对钢轨横向固有频率与速度导纳的影响,进一步从理论和试验方面分析了扣件胶垫垂向预压特性对钢轨横向弯曲振动特性的影响. 研究结果表明:考虑梁弯扭耦合使得钢轨横向弯曲共振频率增大了约29.6 Hz,且在钢轨横向弯曲振动中同时出现弯曲和扭转pinned-pinned模态;扣件胶垫垂向预压特性主要影响钢轨横向中低频振动,随着预压的增大,钢轨横向弯曲共振频率增大;当预压从30 kN增加到50 kN时,实测的横向弯曲共振频率增加了13.7 Hz,考虑和不考虑梁弯扭耦合时其分别增加了12.5 Hz和21.7 Hz;不同预压下考虑梁弯扭耦合的钢轨横向弯曲共振频率变化规律与实测的结果更为接近.

     

  • 图 1  钢轨横向加速度导纳测试装置

    Figure 1.  Schematic of testing device of lateral acceleration admittance of rail

    图 2  垂向30 kN预压下钢轨横向加速度导纳

    Figure 2.  Lateral acceleration admittance of rail under vertical preload of 30 kN

    图 3  不同预压下钢轨横向加速度导纳测试结果平均值

    Figure 3.  Average test results of lateral acceleration admittance of rail under different preloads

    图 4  钢轨-扣件系统的整体结构与周期子结构示意

    Figure 4.  Overall structure and periodic substructure of a rail-fastener system

    图 5  钢轨横截面示意

    Figure 5.  Schematic of rail cross section

    图 6  钢轨跨中垂向速度导纳

    Figure 6.  Vertical velocity admittance of a rail at the mid-span

    图 7  考虑梁弯扭耦合对钢轨横向和扭转速度导纳的影响

    Figure 7.  Influence of vertical preload dependence of fastener pads on lateral velocity admittance of rail

    图 8  扣件胶垫垂向预压特性对钢轨横向速度导纳的影响

    Figure 8.  Influence of the vertical preload dependence of rail pads on the lateral mobility of rail

    图 9  不同预压下钢轨横向弯曲共振频率的实测与仿真值

    Figure 9.  Measured and simulated results of lateral BRF of rail under different preloads

    表  1  轨道结构参数

    Table  1.   Structural parameters of rail

    轨道结构参数数值
    钢轨I0 /m43.714 × 10−5
    扭转常数 Id/m40.215 × 10−5
    y0/m0.037
    Ky0.4
    Kz0.09
    hr2/mm81.47
    br2/mm75
    扣件胶垫l/m0.592
    Kzp/( N·m−13.2 × 107
    Czp/ (N·s·m−12.78 × 104
    下载: 导出CSV

    表  2  Timoshenko简支梁横向弯曲和扭转固有频率

    Table  2.   Lateral bending and torsional natural frequencies of a simply-supported Timoshenko beam Hz

    模态
    阶数
    SEMFEM
    弯扭解耦弯扭耦合n=20n=100n=1000
    15.96.86.05.95.9
    223.823.524.023.823.8
    352.652.654.352.652.6
    464.571.068.564.564.4
    592.894.897.093.192.9
    10257.4244.2265.7257.6257.1
    15418.2443.1477.1420.6418.7
    20581.8605.3679.8585.0581.7
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-10-07
  • 修回日期:  2022-01-05
  • 网络出版日期:  2023-04-26
  • 刊出日期:  2022-01-14

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