Optimized complex Morlet wavelet -based structural closely spaced modes parameter identification

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (1) : 135-139.

Du Yongfeng 1,2, Zhao Lijie1, DANG Xinghai1 ,Li Wanrun1

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Abstract

The paper presents the a method of the research on structural closely spaced modes parameter identification. A new optimization method with center frequency and bandwidth parameters of complex morlet wavelet was proposed, which uses combining Wavelet Shannon and minimum standard deviation. Firstly, the range of the center frequency and bandwidth parameters were derived theoretical .Secondly, center frequency and bandwidth parameters were optimized by two minimum criterion simultaneously. The accuracy and anti-noise performance of the optimization method has been confirmed through numerical simulation model and framework model experimental test.

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wavelet transform / parameter optimization / closely spaced modes / parameter identification

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Du Yongfeng;Zhao Lijie;DANG Xinghai;Li Wanrun. Optimized complex Morlet wavelet -based structural closely spaced modes parameter identification[J]. Journal of Vibration and Shock, 2015, 34(1): 135-139