基于测压风洞试验的钢桁梁上列车二维气动导纳研究

段青松1,马存明2

振动与冲击 ›› 2024, Vol. 43 ›› Issue (9) : 43-49.

PDF(1729 KB)
PDF(1729 KB)
振动与冲击 ›› 2024, Vol. 43 ›› Issue (9) : 43-49.
论文

基于测压风洞试验的钢桁梁上列车二维气动导纳研究

  • 段青松1,马存明2
作者信息 +

2D aerodynamic admittance of train on steel truss girder based on pressure-measuring wind tunnel tests

  • DUAN Qingsong1, MA Cunming2
Author information +
文章历史 +

摘要

基于节段模型测压方法,建立了列车二维气动导纳的识别方法。在紊流场风洞试验中,获取了0°攻角时钢桁梁上列车抖振力的展向相关性;识别了钢桁梁上列车中车的三维气动导纳,探究了钢桁梁上列车中车三维气动导纳与二维气动导纳的关系。可知,随无量纲折减频率及展向间距的增大,抖振力的展向相关性逐渐减小,列车抖振力展向相干函数可用Jakobsen模型较好地拟合。当k1B/2小于0.3时,二维气动导纳值为1,三维气动导纳会明显低估列车的气动导纳值。当k1B/2大于0.3时,三维气动导纳会明显地高估二维气动导纳函数值,且随着折减频率的增大,气动导纳值减小。最后,给出了列车二维气动导纳函数及相干函数的数学表达式。研究成果可为风-列车-桥梁耦合振动计算分析提供参数。

Abstract

Identification method of two-dimensional aerodynamic admittance for the train is established, based on the pressure measurement method of sectional model. In turbulent flow field, the cross-correlation characteristics of buffeting forces on train on truss girder section at wind attack angle 0° is obtained. The three-dimensional aerodynamic admittance of the train vehicle on steel truss girder are also identified. Meanwhile, the three-dimensional aerodynamic admittance and two-dimensional aerodynamic admittance are comparatively investigated. It could be seen that, with the increasing of nondimensional reduction frequency and cross-spacing, the cross-correlation characteristics of buffeting forces on the train is gradually decreased. The cross-coherence function of buffeting force could be well-fitted by the Jakobsen model. When the reduction frequency k1B/2 is less than 0.3, the aerodynamic admittance value is 1. The three-dimensional aerodynamic admittance would significantly underestimate the aerodynamic admittance value. When the reduction frequency kB/2 is larger than 0.3, the three-dimensional aerodynamic admittance function value is larger than the two-dimensional aerodynamic admittance, and the value is decreased with the increasing of reduction frequency. The mathematical expression of two-dimensional aerodynamic admittance function and coherence function of the train is given. The results could provide parameters for the analysis of the coupling vibration for the wind-train -bridge system.

关键词

桥梁工程 / 气动导纳 / 风洞试验 / 列车 / 钢桁梁 / 测压法

Key words

Bridge engineering / aerodynamic admittance / wind tunnel testing / train / steel truss girder / pressure measurement method

引用本文

导出引用
段青松1,马存明2. 基于测压风洞试验的钢桁梁上列车二维气动导纳研究[J]. 振动与冲击, 2024, 43(9): 43-49
DUAN Qingsong1, MA Cunming2. 2D aerodynamic admittance of train on steel truss girder based on pressure-measuring wind tunnel tests[J]. Journal of Vibration and Shock, 2024, 43(9): 43-49

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