| 改进的NExT-ERA时域模态识别法的误差分析 |
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| 引用本文： | 贺瑞,秦权.改进的NExT-ERA时域模态识别法的误差分析[J].清华大学学报(自然科学版),2009(6). |
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| 作者姓名： | 贺瑞 秦权 |
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| 作者单位： | 清华大学土木工程系;中国交通建设集团桥梁技术公司; |
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| 基金项目： | 国家“九七三”重点基础研究项目(2002CB4127009) |
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| 摘 要： | 为进行结构损伤识别,用时域模态识别的NExT-ERA法,从脉动激励和测量噪声下有限时长和时间间隔的结构反应中提取高精度模态参数。改进的相关函数估计公式可消除传统相关估计引起的模态参数误差;利用稳定图对不同系统的阶进行识别,以减小系统定阶误差并选择高精度模态;根据Hankel阵奇异向量、奇值和模态参数的对应关系,分析时域模态识别误差的规律和影响因素。用某三自由度框架和主跨1 650 m的西堠门悬索桥模型验证有效。
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| 关 键 词： | 结构损伤识别 特征系统实现算法 奇值分解 稳定图 模态识别的误差 |
Error analysis of time-domain modal identification methods of improved NExT-ERA |
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| HE Rui,QIN Quan.Error analysis of time-domain modal identification methods of improved NExT-ERA[J].Journal of Tsinghua University(Science and Technology),2009(6). |
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| Authors: | HE Rui QIN Quan |
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| Institution: | 1.Department of Civil Engineering;Tsinghua University;Beijing 100084;China;2.Bridge Technology Company;China Communications Construction Company;Beijing 100102;China |
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| Abstract: | Accurate modal parameters are needed for effective structural damage detection.The NExT-ERA for modal identification in time domain was used to identify high-accuracy modes from noisy structural ambient dynamic responses of limited recording length and time intervals.The correlation estimation in the NExT-ERA was improved to eliminate errors due to traditional correlation estimaties of short-recording-length structural responses.The mean values and standard deviations of the modal parameters identified for ... |
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| Keywords: | structural damage detection eigensystem realization singular value decomposition stabilization diagram modal identification errors |
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