小波阈值降噪在砌体基本频率识别中的应用
|
摘要
为更加准确地获取砌体试件的基本频率,在频谱分析前,对振动信号进行降噪处理.对6个砖砌体试件分别进行环境激励下的动力测试,运用频域峰值点法进行频率识别,采取直接识别和小波阈值降噪后再识别2种手段.比较通过2种途径识别出的基本频率的分布规律,发现运用小波阈值降噪识别的基本频率的变异系数更小.表明在直接识别法识别基本频率的基础上,小波阈值降噪技术能进一步提高频率识别效率,可以应用于砌体结构的现场检测.
To obtain the basic frequency of masonry specimens more accurately,vibration signal can be denoised before spectral analysis.Ambient vibration tests are conducted for six brick masonry specimens;and then basic frequencies of the specimens are identified by peak-picking method(PPM).The PPM can be conducted in two manners.One is direct identification,and the other is identification after denoising by wavelet threshold method.Comparison of the identification results by the two manners shows that the variation coefficient of the basic frequency identified by the indirect identification is smaller.The wavelet threshold denosing increases the efficiency of frequency identification,and can be used in the inspections for masonry structure in-situ.
To obtain the basic frequency of masonry specimens more accurately,vibration signal can be denoised before spectral analysis.Ambient vibration tests are conducted for six brick masonry specimens;and then basic frequencies of the specimens are identified by peak-picking method(PPM).The PPM can be conducted in two manners.One is direct identification,and the other is identification after denoising by wavelet threshold method.Comparison of the identification results by the two manners shows that the variation coefficient of the basic frequency identified by the indirect identification is smaller.The wavelet threshold denosing increases the efficiency of frequency identification,and can be used in the inspections for masonry structure in-situ.
引文
[1]腾海文,姜见鲸,霍达.基于小波变换的结构损伤诊断研究[J].武汉理工大学学报,2006,28(10):58-60.
[2]周福昌,陈进,何俊,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.
[3]Mar Weiping,Fu Holing.Smart active sensing technique using wavelet analysis method on damage detection of composite plate[C]//Proceedings of the 2004IEEE International Conference on Networking,Sensing&Control,Taipei,Taiwan,2004,(3):21-23.
[4]李军,俞建定,徐铁律.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,2006,28(7):1109-1111.
[5]赵晓燕,李宏男.一种改进的小波分析消噪方法及其在健康监测中的应用[J].振动与冲击,2007,26(10):137-140.
[6]付想平,彭斌,黄煜辉,等.基于环境激励的砖砌体弹性模量识别[J].水资源与水工程学报,2013,(4):134-137.
[7]Mitra S K.数字信号处理--基于计算机的方法[M].第4版.北京:电子工业出版社,2012.
[8]曹树谦,张文德,萧龙翔.振动结构模态分析:理论、实验与应用[M].天津:天津大学出版社,2001.
[9]Bendat J S,Piersol A G.Engineering Application of Correlation and Spectral Analysis(Second Edition)[M].New York:John Wiley&Sons,1993.
[10]淳庆,邱洪义.基于环境激励下钢桁梁桥的模态识别[J].特种结构,2005,22(2):62-65.
[11]大崎顺彦.地震动谱分析入门[M].第二版.北京:地震出版社,2008.
[12]陈奎孚,焦群英,高小榕.谱峰法的窗函数选择[J].中国农业大学学报,1997,2(4):21-27.
[13]余训锋,马大玮,魏琳.改进周期图法功率谱估计中的窗函数仿真分析[J].计算机仿真,2008,25(3):111-114.
[14]Donoho D L.De-noising by Soft-Thresholding[J].IEEE Transactions on Information Theory,1995,41(3):613-627.
[15]刘卫东,刘尚合,胡小锋,等.小波阈值去噪函数的改进方法分析[J].高压电技术,2007,33(10):59-63.
[2]周福昌,陈进,何俊,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.
[3]Mar Weiping,Fu Holing.Smart active sensing technique using wavelet analysis method on damage detection of composite plate[C]//Proceedings of the 2004IEEE International Conference on Networking,Sensing&Control,Taipei,Taiwan,2004,(3):21-23.
[4]李军,俞建定,徐铁律.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,2006,28(7):1109-1111.
[5]赵晓燕,李宏男.一种改进的小波分析消噪方法及其在健康监测中的应用[J].振动与冲击,2007,26(10):137-140.
[6]付想平,彭斌,黄煜辉,等.基于环境激励的砖砌体弹性模量识别[J].水资源与水工程学报,2013,(4):134-137.
[7]Mitra S K.数字信号处理--基于计算机的方法[M].第4版.北京:电子工业出版社,2012.
[8]曹树谦,张文德,萧龙翔.振动结构模态分析:理论、实验与应用[M].天津:天津大学出版社,2001.
[9]Bendat J S,Piersol A G.Engineering Application of Correlation and Spectral Analysis(Second Edition)[M].New York:John Wiley&Sons,1993.
[10]淳庆,邱洪义.基于环境激励下钢桁梁桥的模态识别[J].特种结构,2005,22(2):62-65.
[11]大崎顺彦.地震动谱分析入门[M].第二版.北京:地震出版社,2008.
[12]陈奎孚,焦群英,高小榕.谱峰法的窗函数选择[J].中国农业大学学报,1997,2(4):21-27.
[13]余训锋,马大玮,魏琳.改进周期图法功率谱估计中的窗函数仿真分析[J].计算机仿真,2008,25(3):111-114.
[14]Donoho D L.De-noising by Soft-Thresholding[J].IEEE Transactions on Information Theory,1995,41(3):613-627.
[15]刘卫东,刘尚合,胡小锋,等.小波阈值去噪函数的改进方法分析[J].高压电技术,2007,33(10):59-63.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心