基于环境激励的ERA方法在网架结构振动测试中的应用研究
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摘要
基于环境激励的结构振动测试的方法中ERA方法是重要的时域分析方法。本文主要是以随机减量法(RD)和NExT两种数据处理方法结合ERA算法,对绥化学院正在建的网架结构的基本模态参数进行测试。通过分析比较得出RD/ERA和NExT/ERA较直接ERA有更高的精度,且实测分析结果与有限元分析结果较吻合。为网架结构在环境激励下用ERA方法测试模态参数提供了实验依据。
Eigen-system realization algorithm is an important time domain method for structural modal parameter identification based on the ambient excitation.The outhors carry out the modal analysis and modal test for the spacial truss of Suihua University by using random decrement technique or natural excitation technique for data processing,then input the eigen-system realization algorithm for solving the modal parameters of the spacial truss.Comparisons by analysis show that RD / ERA and NExT / ERA have higher accuracy than the direct ERA,and the analysis results meet the finite element method results well.This paper provides an experimental basis for using ERA to test the modal parameters of the spacial trusses.
Eigen-system realization algorithm is an important time domain method for structural modal parameter identification based on the ambient excitation.The outhors carry out the modal analysis and modal test for the spacial truss of Suihua University by using random decrement technique or natural excitation technique for data processing,then input the eigen-system realization algorithm for solving the modal parameters of the spacial truss.Comparisons by analysis show that RD / ERA and NExT / ERA have higher accuracy than the direct ERA,and the analysis results meet the finite element method results well.This paper provides an experimental basis for using ERA to test the modal parameters of the spacial trusses.
引文
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[2]Farrar C R,James G H.System identification from ambient vibration measur ements on a bridge[J].Journal of Sound and Vibration,1997,205(1):1-18.
[3]蒋远林,周辉.铜陵长江大桥主跨的环境随机激励模态测试[J].实验力学,2004,19(2):217-221.JIANG Yuanlin,ZHOU Hui,YAN Zhongliang,et al.Ambient vibration studies of the main span of Tongling Yangzi River bridge[J].Journal of Ex-perimental Mechanics,2004,19(2):217-221.(in Chinese)
[4]Juang J N,Pappa R S.An eigensystem realization algorithm(ERA)for modal parameter identification and model reduction[J].Journal of Guid-ance Control and Dynamics,1985,8(5):620-627.
[5]Ibrahim S R.Random decrement technique for modal identification of structures[J].AIAA Journal of Spacecraft and Rockets[J]1977,14(11):696-700.
[6]Ibrahim S R.The use of random decrement technique for identification of structural modes of vibration[C]//AIAA/ASME,18th Structures,Struc-tural Dynamics and Materials Conference,1977.
[7]韩建平,李林,王洪涛,等.基于Hilbert-Huang变换和随机减量技术的模态参数识别[J].世界地震工程,2011,27(1):72-77.HAN Jianping,LI Lin,WANG Hongtao,et al.Modal parameter identification based on Hilbert-Huang transform and random decrement technique[J].World Earthquake Engineering,2011,27(1):72-77.(in Chinese)
[8]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):1-5.XU Xiouzhong,HUA Hongxing,CHEN Zhaoneng.Methods of modal parameter identification based on ambient excitation[J].Journal of vibrationand Shock,2002,21(3):1-5.(in Chinese)
[9]James C H,Came T G,Edmunds R S.Stars missile-modal analysis of first-flight data using the natural excitation technique,NExT[C]//,12thIMAC,1994.
[10]郑敏,申凡,等.利用互相关函数进行环境激励下的模态分析[J].航空报,2000,21(6):535-537.ZHENG Min,SHEN Fan,CHEN Huaihai,et al.Modal parameters excraction with cross-correlation function under ambient ambient excraction[J].Acta Aeronautica ET Astronautica Sinica,2000,21(6):535-537.(in Chinese)
[11]祁泉泉,辛克贵,崔定宇.扩展特征系统实现算法在结构模态参数识别中的应用[J].工程力学,2011,28(3):29-34.QI Quanquan,XIN Kegui,CUi Dingyu.The application of the extended Eigen-system realization algorithm for structural modal parameter identifica-tion[J].Engineering Machanics,2011,28(3):29-34(in Chinese)
[12]刘锡良.平板网架设计与施工图集[M].天津:天津大学出版社,2000.LIU Xiliang.Atlas tablet grid,design and construction[M].Tianjin:Tianjin University Press.(in Chinese)
[13]MOTTERSHEAD J E.Finite element connectivities from vibration measurements[J].Mechanical Systems and Signal Processing,1999,13(3):367-374.
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