阵风场中桥上列车升力气动导纳数值模拟及应用研究

Numerical simulation and application investigation on lift aerodynamic admittance of railway vehicles on bridge girders in gust

针对阵风场中列车中车二维升力气动导纳展开研究。基于数值模拟的方法,首先验证平板升力气动导纳模拟结果的可靠性,其次对单独列车截面的升力气动导纳及绕流特性进行分析,并与桁架梁、流线型钢箱梁上列车升力气动导纳进行对比。研究结果表明:平板升力气动导纳数值结果与解析解吻合较好,数值识别方法可靠。桥梁主梁上列车升力气动导纳比单独列车升力的气动导纳值偏小,比Sears函数略偏大;当折减频率小于0.01时,流线型钢箱梁上列车升力气动导纳略大于桁架梁上列车气动导纳值。

Two-dimensional lift aerodynamic admittance function(AAF) of railway vehicles in gust was investigated. Based on the numerical simulation method, the reliability of lift AAF of a thin plate was tested. Then, the AAF and flow characteristics of a single middle railway vehicle were investigated. The AAF results of railway vehicle on truss girder and streamlined steel box were also compared with that of a single railway vehicle. The results show that the numerical simulation results of the thin plate are consist with the theoretical solution, which is of reliability. The lift force AAF values of vehicle on girders are a little smaller than that of a single vehicle, and larger than that of the Sears function. When the non-dimensional frequency is smaller 0.01, the lift force AAF values of railway vehicles on streamlined box girder are larger than that of railway vehicles on truss girder.