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Supervised by Ministry of Industry and Information Technology of The People's Republic of China Sponsored by Harbin Institute of Technology Editor-in-chief Yu Zhou ISSNISSN 1005-9113 CNCN 23-1378/T

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Related citation:Chang Xu,Cong Wang,Jingbo Gao.Modal Identification of Linear Time-varying Systems Using Continuous Wavelet Transform[J].Journal of Harbin Institute Of Technology(New Series),2015,22(1):30-36.DOI:10.11916/j.issn.1005-9113.2015.01.005.
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Modal Identification of Linear Time-varying Systems Using Continuous Wavelet Transform
Author NameAffiliation
Chang Xu School of Astronautics, Harbin Institute of Technology, Harbin 150001, China 
Cong Wang School of Astronautics, Harbin Institute of Technology, Harbin 150001, China 
Jingbo Gao School of Astronautics, Harbin Institute of Technology, Harbin 150001, China 
Abstract:
A wavelet based identification method for linear time-varying systems is presented, and the ridge and skeleton of the continuous wavelet transform of free response is used to extract time-varying parameters. The stiffness and damping coefficients of single-degree-of—freedom systems, frequencies and damping ratios of multi-degree-of-freedom systems are estimated without any prior information of systems. The proposed method is applied to linear time-varying systems with both abrupt and smooth variation parameters. Gaussian white noise is added to the response to test the anti-noise performance of the algorithm. The simulation results show that the proposed method is capable of accurately tracking the variation of the systems.
Key words:  time-varying systems  identification  wavelet transform  ridge
DOI：10.11916/j.issn.1005-9113.2015.01.005
Clc Number:TB123
Fund:

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