| 信号预处理对桥梁颤振导数识别结果影响分析 |
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| 引用本文： | 许福友,陈艾荣,张哲,黄才良.信号预处理对桥梁颤振导数识别结果影响分析[J].武汉理工大学学报(交通科学与工程版),2008,32(5). |
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| 作者姓名： | 许福友 陈艾荣 张哲 黄才良 |
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| 作者单位： | 1. 大连理工大学土木水利学院,大连,116024
2. 同济大学桥梁工程系,上海,200092 |
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| 基金项目： | 国家自然科学基金，国家自然科学基金 |
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| 摘 要： | 采用经验模态分解(EMD)对桥梁颤振导数识别信号进行预处理,分离其固有模态函数,消除其中的高频噪声和低频非平稳趋势项;分析了不同阻尼自由振动信号的信噪比与信号长度的关系;研究了苏通大桥主梁节段模型颤振导数对信号长度和消除信号均值、高频噪声、低频趋势项的敏感性.结果表明,借助EMD剔除信号中高频噪声和低频趋势项可以提高桥梁颤振导数的识别精度;颤振导数识别结果与是否消除信号均值和信号长度都有不可忽略的关系.
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| 关 键 词： | 桥梁 颤振导数 参数识别 EMD方法 苏通大桥 |
Analysis of the Influence of Preprocessed Signals on Identification Results of Bridge Flutter Derivatives |
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| Xu Fuyou,Chen Airong,Zhang Zhe,Huang Cailiang.Analysis of the Influence of Preprocessed Signals on Identification Results of Bridge Flutter Derivatives[J].journal of wuhan university of technology(transportation science&engineering),2008,32(5). |
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| Authors: | Xu Fuyou Chen Airong Zhang Zhe Huang Cailiang |
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| Institution: | School of Civil & Hydraulic Engineering;Dalian University of Technology;Dalian 116024;Department of Bridge Engineering;Tongji University;Shanghai 200092 |
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| Abstract: | Using empirical mode decomposition(EMD) method,signals for identification of bridge flutter derivatives are preprocessed to sift the intrinsic mode functions,and the high-frequency noise components and low-frequency unstable tendency are eliminated.With respect to free vibration signals with different damping ratios,the relations of signal noise ratio with signal lengths are analyzed. For Sutong Bridge deck section model,the sensitivities of flutter derivatives to signal length and to whether eliminating th... |
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| Keywords: | bridge flutter derivative parameter identification EMD method Sutong Bridge |
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