基于小波变换的钢箱梁应力监测多尺度分析
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摘要
为了分析不同频率噪声对钢箱梁应力的影响,首先结合同期气象资料建立实测数据与主要影响因素之间的相关关系;其次,采用小波多尺度分析方法对实时测量数据进行分解和重构,并依次剔除噪声引起的结构响应.研究结果表明,采用小波多尺度分析方法处理后的数据更能精确地反映钢箱梁真实的应力响应.
In order to analyze the influences of noise with different frequencies on the stress of steel box girders,first of all,the correlation between the measured data and the main factors was established combining with the contemporaneous meteorological data; then,the real-time measurement data were decomposed and reconstructed by using the wavelet multi-scale analysis; finally,the structural response caused by the noise was eliminated in turn. The results show that the processed data by using the wavelet multi-scale analysis can reflect the true stress response of steel box girders more accurately.
In order to analyze the influences of noise with different frequencies on the stress of steel box girders,first of all,the correlation between the measured data and the main factors was established combining with the contemporaneous meteorological data; then,the real-time measurement data were decomposed and reconstructed by using the wavelet multi-scale analysis; finally,the structural response caused by the noise was eliminated in turn. The results show that the processed data by using the wavelet multi-scale analysis can reflect the true stress response of steel box girders more accurately.
引文
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[3]栾瑞明.Kalman滤波理论在滑坡监测中的应用[J].地壳形变与地震,1994,14(1):52-59.(LUAN Rui-ming.Application of Kalmanfilteringtheorytothe landslide monitoring[J].Crustal Deformation and Earthquake,1994,14(1):52-59.(in Chinese))
[4]MALLATS G.Atheory for multiresolution signal decomposition:the wavelet representation[J].IEEE Transactions on Pattern Analysis and Machine Intelligence,1989,11(7):674-693.
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[7]何亮,敖鹏,孙炳楠.结构健康监测信息的多尺度分析[J].市政技术,2006,24(3):182-186.(HE Liang,AO Peng,SUN Bing-nan.Analysis of informationin multiple measuresfor structure health monitoring[J].Municipal Engineering Technology,2006,24(3):182-186.(in Chinese))
[8]夏平,覃琴.基于多尺度分析的数字通信系统消噪[J].广西师范大学学报:自然科学版,2005,23(1):13-16.(XIAPing,QIN Qin.Noise-filtering of digital communications systems based on wavelet multiresolution analysis[J].Journal of Guangxi Normal University:Engineering Science,2005,23(1):13-16.(in Chinese))
[9]陈飞,赵永,刘阳,等.多尺度分解在地震信号处理中的应用[J].中国地震,2004,20(4):405-409.(CHENFei,ZHAOYong,LIU Yang,et al.Application of wavelet onseismic signal processing[J].Earthquake Researchin China,2004,20(4):405-409.(in Chinese))
[10]CHENYT,HO KC.Multi-resolution analysis,its linktothe discrete parameter wavelet transforms and its initialization[J].IEEE Trans Signal Processing,1996,44(4):1001-1006.
[11]DONOHO D L.De-noismg by soft-thresholding[J].IEEE Transaction on Information,1995,41(3):613-627.
[12]朱丽,娄国伟.自适应阈值的小波去噪研究[J].制导与引信,2003,24(1):13-16.(ZHULi,LOU Guo-wei.Wavelet denoising study with adaptive threshold value[J].Guidance and Fuze,2003,24(1):13-16.(in Chinese))
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