Identifying the modal damping parameters of structures based on analytic wavelet transformation
Shen Jianhong;;Li Chunxiang;Li jinhua
Journal of Vibration and Shock ›› 2009, Vol. 28 ›› Issue (10) : 89-93,1.
Identifying the modal damping parameters of structures based on analytic wavelet transformation
Abstract:The accurate identification of modal parameters is very important in the analysis of structural vibration especially modal damping of structures. By resorting to matching mechanism between the wavelet function and complex-valued signal, both the amplitude and phase frequency information can be revealed by the analytic wavelet transformation (AWT) based on the Gabor wavelet function to achieve the modal damping parameters identification of structures. In accordance with the wavelet transform (WT) theory, the characters of Gabor wavelet function, the time-frequency resolutions, and end effects of the AWT are discussed. In order to effectively carry out the modal damping parameter identification of structures, The method selecting the parameters of Gabor wavelet function and the formula determining the usable lengths of signal are thus proposed. Eventually, the efficiency of the present method is numerically corroborated by using the simulation data of a three degree-of- freedom (3DOF) structure with the closely natural frequencies.
Multiple degrees of freedom (MDOF) / Analytic wavelet transformation (AWT) / Damping parameter identification of structures / Gabor wavelet / Closely natural frequencies {{custom_keyword}} /
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