一种改进的小波分析消噪方法及其在健康监测中的应用
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摘要
结构物的变形可以根据压电智能材料的正压电效应来监测,但是由于压电材料是电学材料,易受外界环境的干扰,预将压电材料用于实际工程的健康监测,好的滤波方法是必备的条件之一。采用小波分析对信号进行降噪和故障诊断是其有效的应用之一,本文在小波多分辨分析阈值法的基础上,对阈值进行了修正,仿真结果表明其效果优于传统阈值法;将该方法应用于利用压电陶瓷传感器所监测到的一框架剪力墙模型的振动信号降噪中,其结果表明该法可以较有效去除噪声。
Two piezoelectric ceramic patches are stuck on the root of a reinforced concrete frame-shear wall which undergoes simulated earthquake in order to monitor its response. Signal denoising and damage detection are the most useful applications of wavelet which can be used to analyse signal in time and frequency domains in the mean time. An improved threshold method based on wavelet multi-resolution analysis is adopted to extract the true in-situ monitoring signal. Simulation result indicates that this method is better than the traditional threshold. A good result is obtained from the monitoring signal acquired by using PZT sensors.
Two piezoelectric ceramic patches are stuck on the root of a reinforced concrete frame-shear wall which undergoes simulated earthquake in order to monitor its response. Signal denoising and damage detection are the most useful applications of wavelet which can be used to analyse signal in time and frequency domains in the mean time. An improved threshold method based on wavelet multi-resolution analysis is adopted to extract the true in-situ monitoring signal. Simulation result indicates that this method is better than the traditional threshold. A good result is obtained from the monitoring signal acquired by using PZT sensors.
引文
[1]李宏男,李东升.土木工程结构安全性评估、健康监测及诊断述评[J].地震工程与工程振动,2002,22(3):82—90.
[2]李宏男,阎石,林皋.智能结构控制发展综述[J].地震工程与工程振动,1999,19(2):29—36.
[3]Ingrid Daubechies著;李建,杨万年译.小波十讲[M].北京,国防工业出版社,2004.
[4]李军,俞建定等.基于小波变换的故障诊断信号非平稳性分析[J].系统工程与电子技术,2006,6,28(7):1109—1111.
[5]周福昌,陈进等.基于小波滤波与循环平稳度分析的滚动轴承早期故障诊断方法[J].振动与冲击,2006,25(4):91—93.
[6]腾海文,姜见鲸等.基于小波变换的结构损伤诊断研究[J].武汉理工大学学报.,10,2006,28(10):58—60.
[7]Rwei-Ping Ma,Ho-Ling Fu.Smart Active Sensing Technique Using Wavelet Analysis Method on Damage Detection of Com-posite Plate.Proceedings of the2004IEEE International Con-ference on Networking,Sensing&Control Taipei,Taiwan,March21—23,2004:773—777.
[8]成礼智,王红霞,罗永.小波的理论与应用[M].北京,科学出版社,2004.
[9]David L.Donoho.De-Noising by Soft-Thresholding[J].IEEE JPTRANSACTIONS ON INFORMATION THEORY,1995,41(3):613—627.
[10]Donoho D,Mallat S.Estimating covariances of locally stationa-ry processes:consistence of best basis methods[A].In proc.of Time-Freq.and Time-Scale Symp.,Paris,7,1996.
[2]李宏男,阎石,林皋.智能结构控制发展综述[J].地震工程与工程振动,1999,19(2):29—36.
[3]Ingrid Daubechies著;李建,杨万年译.小波十讲[M].北京,国防工业出版社,2004.
[4]李军,俞建定等.基于小波变换的故障诊断信号非平稳性分析[J].系统工程与电子技术,2006,6,28(7):1109—1111.
[5]周福昌,陈进等.基于小波滤波与循环平稳度分析的滚动轴承早期故障诊断方法[J].振动与冲击,2006,25(4):91—93.
[6]腾海文,姜见鲸等.基于小波变换的结构损伤诊断研究[J].武汉理工大学学报.,10,2006,28(10):58—60.
[7]Rwei-Ping Ma,Ho-Ling Fu.Smart Active Sensing Technique Using Wavelet Analysis Method on Damage Detection of Com-posite Plate.Proceedings of the2004IEEE International Con-ference on Networking,Sensing&Control Taipei,Taiwan,March21—23,2004:773—777.
[8]成礼智,王红霞,罗永.小波的理论与应用[M].北京,科学出版社,2004.
[9]David L.Donoho.De-Noising by Soft-Thresholding[J].IEEE JPTRANSACTIONS ON INFORMATION THEORY,1995,41(3):613—627.
[10]Donoho D,Mallat S.Estimating covariances of locally stationa-ry processes:consistence of best basis methods[A].In proc.of Time-Freq.and Time-Scale Symp.,Paris,7,1996.
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