Paper Title:
Study on Modal Parameters Identification Based on Stratified Sampling and Complex Morlet Wavelet Transform
  Abstract

The natural frequency of large engineering structures are very low and closely, and it’s very difficult to excite the structures by exciter, in order to identify the modal parameters of large engineering structures, a novel modal parameters identification method based on stratified sampling and complex Morlet wavelet transform is proposed. In order to improve the precision of sampling, stratified sampling, which replaces the random sampling, is applied on random decrement method for extracting the free decrement response signal, and a method is introduced to determine the sample layer weights based on fitting deviation and sample size. In order to improve the identification precision of closely spaced modals, a method is developed to adaptive select the bandwidth parameter and scale parameter of the Morlet wavelet based on the principle of minimum wavelet energy entropy and maximum energy. The analysis of data from the model test of Chongqing Chaotianmen bridge show that, the method is effective to identify the low and closely modal parameters.

  Info
Periodical
Edited by
Guanglin Wang, Huifeng Wang, Jun Liu and Xilin Zhu
Pages
428-433
DOI
10.4028/www.scientific.net/AMR.305.428
Citation
Y. H. Jiang, H. Xu, G. M. Cheng, J. M. Wen, J. J. Ma, "Study on Modal Parameters Identification Based on Stratified Sampling and Complex Morlet Wavelet Transform", Advanced Materials Research, Vol. 305, pp. 428-433, 2011
Online since
July 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Qing Wei Ye, Zhi Min Feng, Hai Gang Hu
Chapter 8: System Modeling and Simulation
Abstract:The free response function is the foundation of mode analysis and recognition of vibration signal, and random decrement algorithm is the...
4372
Authors: Qiang Pei, Long Li
Chapter 3: Structural Engineering
Abstract:Modal identification technique is an effective measure of health diagnosis, structural rehabilitation, retrofitting and strengthening or...
457
Authors: Qiang Pei, Long Li
Chapter 10: Structural Engineering
Abstract:Modal identification technique is an effective measure for building materials health diagnosis, structural optimization design and safety...
732