2D aerodynamic admittance of train on steel truss girder based on pressure-measuring wind tunnel tests
DUAN Qingsong1, MA Cunming2
1. School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China;
2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 621000, China
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.
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. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(9): 43-49.
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