Identification of modal parameters of a system with high damping and closely spaced modes by combining continuous wavelet transform with pattern search

First, the free-decay response (FDR) of a system is established using all the initial identification results obtained by continuous wavelet transform (CWT) method. Then, the initial identification results are corrected using the pattern search method with the residual sum of squares between the FDR...

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Bibliographic Details
Published in:Mechanical systems and signal processing 2008-07, Vol.22 (5), p.1055-1060
Main Authors: Tan, Jiu-Bin, Liu, Yan, Wang, Lei, Yang, Wen-Guo
Format: Article
Language:English
Subjects:
Closely spaced modes
Continuous wavelet transform
Damping ratio
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Identification of modal parameters
Measurement and testing methods
Pattern search
Physics
Solid mechanics
Structural and continuum mechanics
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Description
Summary:First, the free-decay response (FDR) of a system is established using all the initial identification results obtained by continuous wavelet transform (CWT) method. Then, the initial identification results are corrected using the pattern search method with the residual sum of squares between the FDR and the actually measured free-decay signal as the objective function. An integrated method based on both CWT and pattern search is thus developed for more accurate identification of modal parameters of a system with high damping and closely spaced modes. Both simulation and experimental results indicate that the proposed method can be used to achieve more accurate identification of modal parameters in a shorter sampling period of time.
ISSN:0888-3270
1096-1216
DOI:10.1016/j.ymssp.2007.11.017