基于统计分析的损伤识别方法及程序设计
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摘要
为实现大型复杂结构实时在线的健康监测,及时发现结构状态变化,文中基于主成分分析方法,以随机荷载作用下动态响应拟合的AR模型系数为分析对象,得出的前两阶主成分数据有效保留了结构状态的重要信息。应用椭圆控制图的基本原理,提出新的损伤特征指标ω,并将该损伤识别方法与LabVIEW相结合进行程序设计,在一钢框架模型上针对不同工况进行了试验验证,结果表明,该方法能够正确识别结构状态变化,所编软件运行可靠,并在损伤状态下进行了声光报警。
In order to realize the monitoring of the big and complex structure and to find the change of its condition,based on the PCA(principle component analysis) theory,taking AR(auto-regressive) model coefficient by the constant load as the object,the principle component data of the first two order effectively retain the important information of structure state.Utilizing the theory of ellipse control figure,a new damage feature factor ω is put forward.Then a program is written combined the damage identification theory and LabVIEW.Finally,an experiment was conducted on a steel frame model under different conditions,the result shows that the method can identify the changes of the structure condition correctly,also the program works well and gives right sound and light alarm under the damage condition.
In order to realize the monitoring of the big and complex structure and to find the change of its condition,based on the PCA(principle component analysis) theory,taking AR(auto-regressive) model coefficient by the constant load as the object,the principle component data of the first two order effectively retain the important information of structure state.Utilizing the theory of ellipse control figure,a new damage feature factor ω is put forward.Then a program is written combined the damage identification theory and LabVIEW.Finally,an experiment was conducted on a steel frame model under different conditions,the result shows that the method can identify the changes of the structure condition correctly,also the program works well and gives right sound and light alarm under the damage condition.
引文
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[2]李辉,丁桦.结构动力模型修正方法研究进展[J].力学进展,2005,35(2):170-180.
[3]高赞明,孙宗光,倪一清.基于震动方法的汲水门大桥损伤监测研究[J].地震工程与工程震动,2001,21(4):117-123.
[4]郭佳凡,于吉全.基于遗传算法的大型钢塔结构的节点损伤识别方法[J].湖北大学学报(自然科学版),2009,31(4):379-383.
[5]冯新,李国强,周晶.土木工程结构健康诊断中的统计识别方法综述[J].地震工程和工程振动,2005,25(2):105-113.
[6]Housner G W,Bergman L A,Caughey T K,et al.Structuralcontrol:past,resent and future[J].Journal of Engineering Me-chanics,1997,123(9):897-971.
[7]李苗,黄天立,任伟新.温度影响下基于主成分分析和模态柔度的结构异常检测[J].振动与冲击,2011,30(5):83-87.
[8]Doebling S W.A Summary Review of Vibration Based onDamage Identification Methods[J].The Shock and VibrationDigest,1998,30(2):92-105.
[9]杨叔子,吴雅,轩建平,等.时间序列分析的工程应用[M].武汉:华中科技大学出版社,2007.
[10]Wu Sen,Wei Zhuobin.Damage Identification Based on ARCoefficients and PCA[C]//The 2nd International Conferenceon Mechanic Automation and Control Engineering.Inner Mon-golia,China:[s.n.],2011.
[11]Travis J,Kring J.Labview大学实用教程[M].第3版.北京:电子工业出版社,2011.
[12]孙宗光.大跨度斜拉桥结构的动力损伤检测[D].杭州:浙江大学,2001.
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