Modal parametric identification under non-stationary excitation based on random decrement method

被引：0
作者：
Luo, Jun [1 ]
Liu, Gang [1 ,2 ]
Huang, Zong-Ming [1 ,2 ]
机构：
[1] College of Civil Engineering, Chongqing University, Chongqing
[2] The Key Laboratory of New Technology for Construction of Cities in Mountain Area of the Ministry of Education, Chongqing University, Chongqing
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2015年 / 34卷 / 21期
关键词：
Free vibration response; Modal parametric identification; Non-stationary environment excitation; Random decrement method;
D O I：
10.13465/j.cnki.jvs.2015.21.004
中图分类号：
学科分类号：
摘要：
Aiming at the shortcoming of the existing modal parametric identification method with the assumption of stationary excitations, a modal parametric identification method under non-stationary excitation was presented here based on the radom decrement method. Firstly, the variance and the mean of the excitations were derived on the basis of the evolutionary spectral amplitude modulation theory for white noise amplitude modulation excitation, the related excitation with amplitude modulation and the non-stationary excitation with frequency and amplitude modulation. Then, the traditional random decrement method was expanded, and the modal parametric identification problem under non-stationary excitation was converted into a modal parametric identification problem based on free vibration response curves of structures. Finally, the modal parameters were identified using the eigen-system realization algorithms. The method was verified through a numerical model of a cantilevered beam and a two-story steel frame tests. The identification results showed that the proposed method can accurately identify natural frequencies and vibration modal shapes of the two structures under non-stationary excitation and the identification error for natural frequencies is less than 2%, it has a higher identification accuracy. ©, 2015, Chinese Vibration Engineering Society. All right reserved.
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页码：19 / 24and64
页数：2445
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