基于奇异熵定阶降噪的水工结构振动模态ERA识别方法
摘要
针对原型动力试验激励难的问题,结合水工结构在工作状态下环境激励荷载的特点,直接根据水工结构在工作环境激励荷载作用下的动力响应识别结构的动力特性,提出一种利用特征矩阵奇异熵对信号进行降噪、重构、定阶以及模态参数识别的方法,解决了系统特征矩阵定阶难的问题,揭示了结构在工作状态下的模态阶次及模态特性.最后将该方法应用于二滩拱坝在不同泄洪工况下的模态参数识别以及李家峡双排机厂房在停机过程中的结构振动频率识别.该方法的提出,为解决大型水工结构在工作环境激励下的模态参数识别问题提供了捷径.
引文
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15Yang W X,Peter W T.Development of an advanced noise reduction method for vibration analysis based on sin-gular value decomposition.NDT&E Int,2003,36:419—432
16杨文献,任兴民,姜节胜.基于奇异熵的信号降噪技术研究.西北工业大学学报,2001,19(3):368—371
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19练继建,田会静,秦亮,等.停机过程中的水电站厂房支承结构动力特性识别方法.中国工程科学,2006,8(4):72—75
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2苏克忠,郭永刚,常延改,等.大坝原型动力试验.北京:地震出版社,2006
3Zhang Y,Zhang Z,Xu X.Modal parameter identification using response data only.J Sound Vib,2005,282(2):367—380
4Mohanty P,Rixen D J.A modified Ibrahim time domain algorithm for operational modal analysis in cluding harmonic excitation.J Sound Vib,2004,275(2):375—390
5Lardies J,larbi N.A new method for model order selection and modal parameter estimation in time domain.J Sound Vib,2001,245(2):187—203
6Cauberghe B,Guilaume P,Verboven P.Identification of modal parameters including unmeasured forces andtransient effects.J Sound Vib,2003,265(3):609—625
7Qin Q,Li H B,Qian Z.Modal identification of Tsing Ma bridge by using improved eigensystem realization algo-rithm.J Sound Vib,2001,247(2):325—341
8Mohanty P,Rixen D J.Operational modal analysis in the presence of harmonic excitation.J Sound Vib,2004,270(2):93—109
9Catbas F N,Brown D L,Aktan A E.Parameter estimation for multipli-input multipli-output modal analysis of large structures.J Eng Mech-ASCE,2004,130(8):921—930
10傅志方.振动模态分析与参数辨识.北京:机械工业出版社,1990
11Hong V M,Masato A.The eigensystem realization algorithm for ambient vibration measurement using laser Doppler vibrometers.Proc American Control Conf,Arlington:Va,2001,6:25—27
12Juang J N,Pappa R.An eignsystem realization algorithm for modal parameter identification and model reduction.J Guid Control Dynam,1985,8(5):620—627
13王安丽,史志富,张安.基于熵的空中目标识别模型及应用.火力与指挥控制,2005,30(2):110—112
14张贤达.现代信号处理方法.北京:清华大学出版社,1995
15Yang W X,Peter W T.Development of an advanced noise reduction method for vibration analysis based on sin-gular value decomposition.NDT&E Int,2003,36:419—432
16杨文献,任兴民,姜节胜.基于奇异熵的信号降噪技术研究.西北工业大学学报,2001,19(3):368—371
17练继建.二滩拱坝水垫塘泄洪消能安全实时监控系统研究报告.天津:天津大学水利水电工程系,2005
18练继建.黄河李家峡水电站双排机组真机试验研究报告.天津:天津大学水利水电工程系,2004
19练继建,田会静,秦亮,等.停机过程中的水电站厂房支承结构动力特性识别方法.中国工程科学,2006,8(4):72—75
20练继建,秦亮,王日宣,等.双排机水电站厂房结构动力特性研究.水力发电学报,2004,23(2):55—60
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