一种改进模态参数识别方法在结构工程中的应用
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摘要
提出了一种采用带有间断频率的经验模式分解(EMD)与自然激励法(NExT)相结合的新的模态时域识别方法,并在理论上证明了该方法的正确性.数值模拟与工程实例识别结果表明,该方法能够准确识别出结构的模态频率和模态阻尼比.
A new data analyzing method which consists of mainly the empirical mode decomposition(EMD) with intermittency frequency and the developed natural excitation technique(NExT) is presented.The validity of the method has been proved theoretically.Finally,the results of simulation and engineering example suggest that this new method could exactly identify the structure vibration frequency and the mode damping ratio.
A new data analyzing method which consists of mainly the empirical mode decomposition(EMD) with intermittency frequency and the developed natural excitation technique(NExT) is presented.The validity of the method has been proved theoretically.Finally,the results of simulation and engineering example suggest that this new method could exactly identify the structure vibration frequency and the mode damping ratio.
引文
[1]Brownjohn J M W.Ambient vibration studies forsystem identification of tall buildings[J].Earth-quake Engineering and Structure Dynamics,2003,32:71-95.
[2]李德葆,陆秋海.实验模态分析及其应用[M].北京:科学出版社,2002.(LI De-bao,LU Qiu-hai.Experi-mental modal analysis and its application[M].Bei-jing:Science Press,2002.(in Chinese))
[3]Huang N E,Shen Z,Long S R,et a1.The empiricalmode decomposition and the Hiblert spectrum fornon-linear and non-stationary time series analysis[A].Proceedings of the Royal Society London A[C].Great Britain:The Royal Society,1998:903-995.
[4]续秀忠,华宏星,陈兆能.基于环境激励的模态参数辨识方法综述[J].振动与冲击,2002,21(3):1-6.(XU Xiu-zhong,HUA Hong-xing,CHEN Zhao-neng.Review of modal identification method basedon ambient excitation[J].Journal of Vibration andShock,2002,21(3):1-6.(in Chinese))
[5]陈隽,徐幼麟,李杰.Hilbert-Huang变换在密频结构阻尼识别中的应用[J].地震工程与工程振动,2003,23(4):34-42.(CHEN Jun,XU You-lin,LI Jie.Hil-bert-Huang transform for damping ratio identifica-tion of structures with closely spaced modes of vibra-tion[J].Earthquake Engineering and Engineering Vi-bration,2003,23(4):34-42.(in Chinese))
[6]张之颖,谭高铭,吕西林.环境激励下房屋建筑阻尼比的识别方法[J].西安建筑科技大学学报:自然科学版,2007,39(6):767-772.(ZHANG Zhi-ying,TAN Gao-ming,LV Xi-lin.Study on the identifica-tion method of damping for the building under ambi-ent excitation[J].Journal of Xi’an University of Ar-chitecture&Technology:Natural Science Edition,2007,39(6):767-772.(in Chinese))
[7]James G H,Garne T G,Laufer J P.The natural exci-tation technique(NExT)for modal parameter ex-traction from ambient operating structure[J].TheInternational Journal of Analytical and ExperimentalModal Analysis,1995,10(4):260-277.
[8]Huang N E,Shen Z,Long S R.A new view of non-linear water waves:The hilbert spectrum[J].AnnualReview of Fluid Mechanics,1999,31:417-57.
[9]宋立新,王祁.具有间断事件检测和分离的经验模态分解方法[J].哈尔滨工程大学学报,2007,28(2):178-182.(SONG Li-xin,WANG Qi.Empiricalmode decomposition method with intermittency testand separation[J].Journal of Harbin Engineering U-niversity,2007,28(2):178-182.(in Chinese))
[10]Au F T K,Tham L G,Lee P K K,et al.Ambient vi-bration measurements and finite element modellingfor the Hong Kong Ting Kau Bridge[J].StructuralEngineering and Materials,2003,15(1):115-134.
[2]李德葆,陆秋海.实验模态分析及其应用[M].北京:科学出版社,2002.(LI De-bao,LU Qiu-hai.Experi-mental modal analysis and its application[M].Bei-jing:Science Press,2002.(in Chinese))
[3]Huang N E,Shen Z,Long S R,et a1.The empiricalmode decomposition and the Hiblert spectrum fornon-linear and non-stationary time series analysis[A].Proceedings of the Royal Society London A[C].Great Britain:The Royal Society,1998:903-995.
[4]续秀忠,华宏星,陈兆能.基于环境激励的模态参数辨识方法综述[J].振动与冲击,2002,21(3):1-6.(XU Xiu-zhong,HUA Hong-xing,CHEN Zhao-neng.Review of modal identification method basedon ambient excitation[J].Journal of Vibration andShock,2002,21(3):1-6.(in Chinese))
[5]陈隽,徐幼麟,李杰.Hilbert-Huang变换在密频结构阻尼识别中的应用[J].地震工程与工程振动,2003,23(4):34-42.(CHEN Jun,XU You-lin,LI Jie.Hil-bert-Huang transform for damping ratio identifica-tion of structures with closely spaced modes of vibra-tion[J].Earthquake Engineering and Engineering Vi-bration,2003,23(4):34-42.(in Chinese))
[6]张之颖,谭高铭,吕西林.环境激励下房屋建筑阻尼比的识别方法[J].西安建筑科技大学学报:自然科学版,2007,39(6):767-772.(ZHANG Zhi-ying,TAN Gao-ming,LV Xi-lin.Study on the identifica-tion method of damping for the building under ambi-ent excitation[J].Journal of Xi’an University of Ar-chitecture&Technology:Natural Science Edition,2007,39(6):767-772.(in Chinese))
[7]James G H,Garne T G,Laufer J P.The natural exci-tation technique(NExT)for modal parameter ex-traction from ambient operating structure[J].TheInternational Journal of Analytical and ExperimentalModal Analysis,1995,10(4):260-277.
[8]Huang N E,Shen Z,Long S R.A new view of non-linear water waves:The hilbert spectrum[J].AnnualReview of Fluid Mechanics,1999,31:417-57.
[9]宋立新,王祁.具有间断事件检测和分离的经验模态分解方法[J].哈尔滨工程大学学报,2007,28(2):178-182.(SONG Li-xin,WANG Qi.Empiricalmode decomposition method with intermittency testand separation[J].Journal of Harbin Engineering U-niversity,2007,28(2):178-182.(in Chinese))
[10]Au F T K,Tham L G,Lee P K K,et al.Ambient vi-bration measurements and finite element modellingfor the Hong Kong Ting Kau Bridge[J].StructuralEngineering and Materials,2003,15(1):115-134.
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