基于小波包分析的地震作用下网壳结构的损伤判别方法
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摘要
针对空间结构自由度多,地震作用下存在复杂的非线性等特性,该文提出了以小波包分析为基础,结合多传感器数据融合和聚类分析等手段的空间网壳结构地震作用下的损伤判别方法。首先建立损伤指标和损伤判别样本库,应用最小距离原则判别结构的损伤位置;其次考虑噪声污染对判别的影响,检验了损伤指标的抗噪性;最后采用数值模拟进行典型算例分析,准确判别出强震后结构发生损伤的位置,验证了该方法的有效性及工程可行性。
Because spatial structure has multi degree of freedom and complicated nonlinearity during the earthquake,the damage detection of spatial structure is difficult.A method of spatial structure damage detection under earthquakes is proposed by wavelet packet analysis in this paper.Furthermore,data fusion and clustering analysis are used.After constructing the damage index and diagnosis data bases,the damage location is detected using the minimum distance principle of clustering analysis.Noise effect is also studied,and the results show that noise has little impact on the accuracy of the damage detection method.The method is proven to be effective through numerical simulated analysis of a latticed shell.
Because spatial structure has multi degree of freedom and complicated nonlinearity during the earthquake,the damage detection of spatial structure is difficult.A method of spatial structure damage detection under earthquakes is proposed by wavelet packet analysis in this paper.Furthermore,data fusion and clustering analysis are used.After constructing the damage index and diagnosis data bases,the damage location is detected using the minimum distance principle of clustering analysis.Noise effect is also studied,and the results show that noise has little impact on the accuracy of the damage detection method.The method is proven to be effective through numerical simulated analysis of a latticed shell.
引文
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[4]范颖芳,胡志强,周晶,张学志.基于小波包分析的肋拱桥结构损伤状态研究[J].工程力学,2008,25(5):182―188.Fan Yingfang,Hu Zhiqiang,Zhou Jing,Zhang Xuezhi.Study on damage state ribbed arch bridge using wavelet packet analysis[J].Engineering Mechanics,2008,25(5):182―188.(in Chinese)
[5]Li Hongnan,Yi Tinghua,Gu Ming,Huo Linsheng.Evalution of earthquake-induced structural damages by wavelet transform[J].Progress in Natural Science,2009,19:461―470.
[6]Gaetan Kerschen,Keith Worden,Alexander F Vakakis,Jean-Claude Golinval.Past,present and future of nonlinear system identification in structural dynamics[J].Mechanical Systems and Signal Processing,2006,20:505―578.
[7]姜增国,瞿伟廉,闵志华.基于小波包分析的结构损伤定位方法[J].武汉理工大学学报,2006,28(11):94―98.Jiang Zengguo,Qu Weilian,Min Zhihua.Damage localization of structures by wavelet packet analysis[J].Journal of Wuhan University of Technology,2006,28(11):94―98.(in Chinese)
[8]谭冬梅,瞿伟廉.基于小波包分析的空间杆系结构损伤诊断[J].武汉理工大学学报,2007,29(1):153―156.Tan Dongmei,Qu Weilian.The damage identification of space member structures based on wavelet packet analysis[J].Journal of Wuhan University of Technology,2007,29(1):153―156.(in Chinese)
[9]刁延松.基于神经网络和小波分析的海洋平台结构损伤检测研究[D].青岛:中国海洋大学,2006.Diao Yansong.Damage detection of offshore platform structures based on neural network and wavelet analysis[D].Qingdao:Ocean University of China,2006.(in Chinese)
[10]朱泽君,黄涛,刘曦霞.多传感器数据融合技术研究现状及发展方向[J].船舶电子工程,2009,29(2):13―17.Zhu Zejun,Huang Tao,Liu Xixia.Current research status and its development direction of multi-sensor data fusion technology[J].Ship Electronic Engineering,2009,29(2):13―17.(in Chinese)
[11]泰寿康.综合评价原理与应用[M].北京:电子工业出版社程,2003.Tai Shoukang.Comprehensive evaluation principles and applications[M].Beijing:Electronic Engineering Press,2003.(in Chinese)
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