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An effective procedure for extracting the first few bridge frequencies from a test vehicle
Acta Mechanica ( IF 2.7 ) Pub Date : 2021-01-18 , DOI: 10.1007/s00707-020-02870-w
Y. B. Yang , Hao Xu , X. Q. Mo , Z. L. Wang , Y. T. Wu

This study presents an effective procedure for extracting the first few bridge frequencies using the data collected by a moving test vehicle. Previously, the effectiveness of the vehicle scanning method for bridge frequencies was hampered by factors such as vehicle frequency and road surface roughness. To this end, the contact-point response of the vehicle with the bridge that is free of the vehicle frequency is adopted in the analysis. To enhance the visibility of the first few bridge frequencies for extraction, the variational mode decomposition with band-pass filter (VMD-BPF) is proposed herein. The VMD is neater and more elegant than the empirical mode decomposition (EMD) in that less decompositions are needed, while there exists no mode-coupling problem, and the BPF serves to remove the undesired roughness frequencies. To verify the feasibility of the proposed procedure, both the vehicle and contact-point responses generated either numerically or by the field test are analyzed. It is demonstrated that the VMD-BPF is an effective method for extracting the bridge frequencies using the contact-point response for the scenarios considered.



中文翻译:

从测试车辆中提取前几个桥频率的有效程序

这项研究提出了一种有效的程序,可以使用移动的测试车辆收集的数据提取前几个桥频率。以前,车辆扫描方法对桥梁频率的有效性受到诸如车辆频率和路面粗糙度等因素的影响。为此,在分析中采用了车辆与没有车辆频率的桥的接触点响应。为了增强前几个电桥频率的可见性,采用带通滤波器进行变模分解(VMD-BPF)在此提出。与经验模态分解(EMD)相比,VMD更整洁,更美观,因为所需的分解次数更少,同时不存在模态耦合问题,而BPF则用于消除不希望的粗糙度频率。为了验证所提出程序的可行性,对通过数值或现场测试生成的车辆和接触点响应都进行了分析。结果表明,对于所考虑的场景,VMD-BPF是一种使用接触点响应提取电桥频率的有效方法。

更新日期:2021-01-18
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