Application of Time-Frequency Distribution and FRFT in Modal Parameter Identification

被引：0

作者：

Fan, Jiangling ^{[1
]}

Zhang, Zhiyi ^{[2
]}

机构：

[1] Shanghai Univ Engn Sci, Coll Mech Engn, Shanghai, Peoples R China

[2] Shanghai Jiao Tong Univ, Inst Vibrat Shock & Noise, Shanghai, Peoples R China

来源：

MECHANICAL ENGINEERING AND GREEN MANUFACTURING, PTS 1 AND 2 | 2010年

关键词：

Time -Frequency Distribution; FRFT; Gabor Expansion; Modal Parameter Identification; Ambient Excitation; GABOR EXPANSION;

D O I：

10.4028/www.scientific.net/AMM.34-35.1925

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A combination of fractional Fourier transform (FRFT) and time-frequency method is presented to identify ambient excited modes. In this method, Gabor expansion is applied to identify natural frequencies and damping ratios. The signal autocorrelation can enhance energy distribution of each channel signal, which can help to identify parameter. FRFT is a good tool to estimate excitation signal. A simulation example is presented to demonstrate the performance of this method. The results have shown that the proposed method gives a reasonable estimation of modal parameters and excitation signal from response signals.

引用

页码：1925 / +

页数：3

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