| 一种利用时间序列分析的特征提取与损伤预警方法 |
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| 引用本文： | 刘毅,李爱群,费庆国,丁幼亮.一种利用时间序列分析的特征提取与损伤预警方法[J].东南大学学报,2007,23(1):86-91. |
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| 作者姓名： | 刘毅 李爱群 费庆国 丁幼亮 |
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| 作者单位： | 东南大学混凝土及预应力混凝土结构教育部重点实验室 南京210096 |
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| 基金项目： | 国家高技术研究发展计划(863计划)，国家自然科学基金 |
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| 摘 要： | 针对结构健康监测中如何基于在线监测数据实现损伤诊断的问题,提出了一种利用时间序列分析ARMA模型的特征提取和损伤预警方法.首先对所有监测数据样本建立ARMA模型,以模型中AR部分参数的主成分矩阵构建Mahalanobis距离判别函数,提出了一种新的结构损伤敏感指标DDSF.然后,采用t-检验考察该指标在损伤前后是否存在显著性变化,从而可以有效地实现结构损伤预警.三跨连续梁数值算例表明,提出的结构损伤特征指标对结构的微小损伤具有敏感性,具备结构在线实时损伤预警的应用价值.
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| 关 键 词： | 特征提取 损伤预警 时间序列分析 结构健康监测 |
| 文章编号： | 24268024 |
| 修稿时间： | 11 13 2006 12:00AM |
Feature extraction and damage alarming using time series analysis |
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| Liu Yi,Li Aiqun,Fei Qingguo,Ding Youliang.Feature extraction and damage alarming using time series analysis[J].Journal of Southeast University(English Edition),2007,23(1):86-91. |
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| Authors: | Liu Yi Li Aiqun Fei Qingguo Ding Youliang |
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| Institution: | Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education, Southeast University, Nanjing 210096, China |
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| Abstract: | Aiming at the problem of on-line damage diagnosis in structural health monitoring (SHM), an algorithm of feature extraction and damage alarming based on auto-regressive moving-average (ARMA) time series analysis is presented.The monitoring data were first modeled as ARMA models,while a principal-component matrix derived from the AR coefficients of these models was utilized to establish the Mahalanobis-distance criterion functions.Then,a new damage-sensitive feature index DDSF is proposed.A hypothesis test involving the t-test method is further applied to obtain a decision of damage alarming as the mean value of DDSF had significantly changed after damage.The numerical results of a three-span-girder model shows that the defined index is sensitive to subtle structural damage,and the proposed algorithm can be applied to the on-line damage alarming in SHM. |
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| Keywords: | feature extraction damage alarming time series analysis structural health monitoring |
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