基于小波变换的爆破振动信号能量分布特征分析
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摘要
为了深入研究爆破地震波特性,应用小波变换方法对具有短时非平稳特点的爆破振动信号进行了能量分布特征分析。根据小波变换的时-频特性和分层分解展开关系,将爆破振动时间历史信号用分层重构信号进行扫描,应用这些信号得到了不同频率带上爆破振动的相对能量分布和振动强度的时间变化规律。爆破振动信号实测结果分析表明,基于小波变换的能量分布特征分析可以更准确地给出爆破振动信号的细节信息。研究结果为分析爆破振动结构安全性提供了新的途径。
The features of energy distribution for blasting seismic wave which is short-time non-stationary random signal are analysed by wavelet transform technique.According to the time-frequency characteristic and multiresolution decomposition of discrete wavelet transform,the signal history of blasting seismic wave is expressed by different level reconstructed signals of wavelet decomposition.By using these signals,the relative energy distribution of blasting seismic wave in different frequency bands and the regularity of vibration strength varying with time is obtained.Blasting seismic wave measurement shows that the time-frequency characteristic analysis based on wavelet transform yields more accurate information of blasting seismic wave.The suggested method provides a new approach for analyzing the structural safety under blasting vibration conditions.
The features of energy distribution for blasting seismic wave which is short-time non-stationary random signal are analysed by wavelet transform technique.According to the time-frequency characteristic and multiresolution decomposition of discrete wavelet transform,the signal history of blasting seismic wave is expressed by different level reconstructed signals of wavelet decomposition.By using these signals,the relative energy distribution of blasting seismic wave in different frequency bands and the regularity of vibration strength varying with time is obtained.Blasting seismic wave measurement shows that the time-frequency characteristic analysis based on wavelet transform yields more accurate information of blasting seismic wave.The suggested method provides a new approach for analyzing the structural safety under blasting vibration conditions.
引文
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[18]林大超,施惠基,白春华,等.爆炸地震效应的时频分析[J].爆炸与冲击,2003,23(1):31-35.LIN Da-chao,SHI Hui-ji,BAI Chun-hua,et al.Time-frequency analysis of explosion seismic effects[J].Explo-sion and Shock Waves,2003,23(1):31-35.
[2]李翼祺,马素贞.爆炸力学[M].北京:科学出版社,1992:441-443.
[3]龙源,冯长根,徐全军,等.爆破地震波在岩石介质中传播特性与数值计算研究[J].工程爆破.2000,6(3):1-7.LONG Yuan,FENG Chang-gen,XU Quan-jun,et al.Study on propagation characteristics of blasting seismicwaves in a rock medium and numerical calculation[J].Engineering Blasting,2000,6(3):1-7.
[4]龙源,娄建武.工程爆破中的建筑物振动监测[J].解放军理工大学学报,2000,1(5):58-62.LONG Yuan,LOU Jian-wu.Measuring and analysis of structure’s response vibration in engineering blasting[J].Journal of PLA University of Science and Technology,2000,1(5):58-62.
[5]娄建武,徐全军,龙源.影响核岛新浇混凝土强度的爆破振动速度阈值研究[J].世界地震工程,2003,19(2):163-167.LOU Jian-wu,XU Quan-jun,LONG Yuan.Research on threshold for influence of blasting vibration velocity overthe fresh concrete quality of the nuclear power station[J].World Information on Earthquake Engineering,2003,19(2):163-167.
[6]娄建武,龙源,徐全军.人工模拟爆破振动信号及其频谱特性检验[J].工程爆破,2001,7(1):7-11.LOU Jian-wu,LONG Yuan,XU Quan-jun.Simulating of blasting vibration signal and verification of its frequencyspectrum[J].Engineering Blasting,2001,7(1):7-11.
[7]娄建武,龙源,方向.基于反映谱分析的爆破震动破坏评估研究[J].爆炸与冲击,2003,23(1):41-46.LOU Jian-wu,LONG Yuan,FANG Xiang.Study on blasting vibration damage based on response spectrum[J].Explosion and Shock Waves,2003,23(1):41-46.
[8]娄建武,龙源.爆破震动信号的特征提出及识别技术研究[J].振动与冲击,2003,22(3):80-82.LOU Jian-wu,LONG Yuan.Study on the technique of take and identify characteristics of blasting seismic wave[J].Vibration and Shock Waves,2003,22(3):80-82.
[9]Kim D S,Lee J S.Propagation and attenuation characteristics of various ground vibration[J].Soil Dynamics andEarthquake Engineering,2000,19(1):115-126.
[10]Lu Y,Hao H,Ma G,et al.Simulation of structural response under high-frequency ground excitation[J].Earth-quake Engineering&Structural Dynamics,2001,30(2):307-325.
[11]徐科军,全书海.信号处理技术[M].武汉:武汉理工大学出版社,2001.
[12]杨福生.小波变换的工程分析与应用[M].北京:科学出版社,2000.
[13]张贤达,保铮.非平稳信号分析与处理[M].北京:国防出版社,1998.
[14]于德介,程军圣.基于小波变换的时-能密度分析[J].振动工程学报,2001,14(1):109-112.YU De-jie,CHENG Jun-sheng.Time-energy density analysis based on wavelet transform[J].Journal of VibrationEngineering,2001,14(1):109-112.
[15]胡昌华,张军波,夏军,等.基于MATLAB的系统分析与统计小波分析[M].西安:西安电子科技大学出版社,1999:210-232.
[16]Daubechies I.Orthonormal bases of compactly supported wavelet[J].Communication Pure and Applied Mathe-matics,1988,41(7):909-996.
[17]何军,于亚伦,梁文基.爆破振动信号的小波分析[J].岩石工程学报,1998,20(1):47-50.HE Jun,YU Ya-lun,LIANG Wen-ji.Wavelet analysis for blasting seismic signals[J].Chinese Journal ofGeotechnical Engineering,1998,20(1):47-50.
[18]林大超,施惠基,白春华,等.爆炸地震效应的时频分析[J].爆炸与冲击,2003,23(1):31-35.LIN Da-chao,SHI Hui-ji,BAI Chun-hua,et al.Time-frequency analysis of explosion seismic effects[J].Explo-sion and Shock Waves,2003,23(1):31-35.
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