爆炸荷载下结构响应的EMD分析
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摘要
通过经验模态分解法(EMD)将信号分解为固有模态函数(IMF),结果表明震动信号是由不同频率的具有实际物理意义的固有模态函数分量组成.同时建立了爆炸荷载下的单自由度体系结构动态响应模型,并运用实例分析了结构在爆破震动下的动力放大效应.分析表明不同的IMF分量对结构的影响各不相同,两者频率越接近,其共振作用就越明显.结构对荷载的响应主要取决于不同幅值、不同频率的各IMF分量的共同作用.
Signal was decomposed into Intrinsic Mode Function(IMF) by Empirical Mode Decomposition(EMD) method, it is found that the vibration signal is composed by IMFs with different frequency and practical physical meanings. In addition, the model of structure dynamic response to blasting load with single degree of freedom system was established, and dynamical ampliation of structure response to blasting vibration was analyzed with example. It is indicated that influence upon structure from different IMF is unlike, the both frequency nearer, the resonance action more evident, and the structure response to load is mainly lied on co-action of each IMF with different swing and frequency.
Signal was decomposed into Intrinsic Mode Function(IMF) by Empirical Mode Decomposition(EMD) method, it is found that the vibration signal is composed by IMFs with different frequency and practical physical meanings. In addition, the model of structure dynamic response to blasting load with single degree of freedom system was established, and dynamical ampliation of structure response to blasting vibration was analyzed with example. It is indicated that influence upon structure from different IMF is unlike, the both frequency nearer, the resonance action more evident, and the structure response to load is mainly lied on co-action of each IMF with different swing and frequency.
引文
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[2]FAJFAR P.Consistent Inelastic Design Spectra:Hysteretic and Input Energy[J].Earthquake Eng Struct Dyn,1994,23(5):523-537.
[3]HUANG Kang.A Bridge Monitoring Method Based on Vibration Characteristics under a Trasient Load[C]//Beijing:Proceedings of the International Symposium of Civil Engineering in the21st Century,2002:563-566.
[4]中华人民共和国国家标准.爆破安全规程[S].GB6722-2003,北京:中华人民共和国国家质量监督检疫总局,2003.Nation Standard ofthe People's Republic ofChina.SafetyRegulation for Blasting[S].GB6722-2003,Beijing:General Administration ofQuality Supervision,InspectionandQuarantineofthePeople'sRepublicofChina,2003.
[5]STEPHEN D BUTT,DEREK B A,PETER N C.Analysis of High Frequency Microseismicity Recorded at An Underground Hardrock Mine[J].Pureand Appllied Geophsics,1997,(150):693-704.
[6]汪旭光,于亚伦.关于爆破震动安全判据的几个问题[J].工程爆破,2001,7(2):88-92.WANGXu-guang,YUYa-lun.OnSeveralProblemsof SafetyCriterionfor Blasting Vibration[J].Engineering Blasting,2001,7(2):88-92.
[7]HUANG N E,SHEN Z,LONG S R,et al.The Empirical Mode DecompositionandtheHilbertSpectrumforNonlinearandNon-Stationary TimeSeriesAnalysis[J].ProRoySocLondonA,1998,454:903-995.
[8]李夕兵,张义平,刘志祥,等.爆破震动信号的小波分析与HHT变换[J].爆炸与冲击,2005,25(6):528-535.LIXi-bing,ZHANGYi-ping,LIUZhi-xiang,etal.WaveletAnalysisand Hilbert-Huang TransformofBlastingVibration Signal[J].Explosiveand ShockWaves,2005,25(6):528-535.
[9]张义平,李夕兵,赵国彦,等.Hilbert-Huang变换在爆破震动信号分析中的应用[J].中南大学学报,2005,36(5):882-887.ZHANG Yi-ping,LI Xi-bing,ZHAO Guo-yan,et al.Application of Hilbert-Huang Trans Form in Blasting Vibration Signal Analysis[J].Journal of Central South University(Science and Technology),2005,36(5):882-887.
[10]张义平,李夕兵,赵国彦,等.爆破震动信号的时频分析[J].岩土工程学报,2005,27(12):1472-1477.ZHANG Yi-ping,LI Xi-bing,ZHAO Guo-yan,et al.Time-Frequency Analysis of Blasting Vibration Signals[J].Chinese Journal of GeotechnicalEngineering,2005,27(12):1472-1477.
[11]黄宗明,孙勇.决定单自由度体系弹塑性地震反应的建(构)筑物参数分析[J].重庆建筑大学学报,1996,18(3):42-48.HUANG Zong-ming,SUN Yong.On Determinative Parameters of SDOF SystemsinElasto-plasticEarthquakeResponse[J].JournalofChongqing JianzhuUniversity,1996,18(3):42-48.
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