桥梁结构系统识别时的参考通道选择问题

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振动与冲击 ›› 2011, Vol. 30 ›› Issue (12) : 181-184.

论文

桥梁结构系统识别时的参考通道选择问题

张宇鑫1; Sim S H2; Spencer B F2

作者信息 +

Reference channel selection strategy in system identification of brdige structure

Zhang Yu-xin 1; Sim S H2; Spencer B F2

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文章历史 +

摘要

基于环境随机激励技术（NExT）与特征系统实现方法（ERA）的基本思想，明确了采用多参考通道环境随机激励技术与ERA方法联合应用的过程，并重点对NExT/ERA方法应用中参考通道的选择问题进行了分析研究。首先，基于模态频率和振型评价指标提出了两个评价准则，可用于识别结果的评价。依据此两评价准则，提出了多参考通道的选择方案。该方法可用于排除不好的通道，尤其对分析节点较多的复杂结构意义会更为突出。最后，通过将方法应用于一著名斜拉桥工程——世界结构控制研究的标尺建筑BILL EMERSON 桥的垂直模态识别，验证了此工作的意义。

Abstract

Based on the basic idea of Natural Excitation Technique (NExT) and Eigen Value Realization Algorithm (ERA), the solution process are formulated for NExT/ERA conducting multiple reference channels; and the strategies for determining the reference channels are suggested and investigated in the mean time. First, two evaluation criteria concerning modal frequencies and mode shapes are proposed to evaluate the identification results; then according to the criteria, the strategies for multiple references selection are proposed and discussed herein. The strategy can be used to exclude the bad references, which is more important for complex structures for which more sensors could be on the nodes of the natural modes so that more sensors are excluded and only a few sensors may survive. By applying the method to the Bill Emerson Bridge who is well known as it has been used worldwide as the ASCE benchmark model for the structural control problem of cable-stayed bridges, the work in this paper is proved to be meaningful. The work can also provide helpful reference for the system identification of general cable-stayed bridges.

导出引用

张宇鑫;Sim S H;Spencer B F. 桥梁结构系统识别时的参考通道选择问题[J]. 振动与冲击, 2011, 30(12): 181-184

Zhang Yu-xin;Sim S H;Spencer B F. Reference channel selection strategy in system identification of brdige structure[J]. Journal of Vibration and Shock, 2011, 30(12): 181-184