Wavelet analysis for identification of damping ratios and natural frequencies

被引：55

作者：

Chen, Shyh-Leh ^{[1
]}

Liu, Jia-Jung ^{[1
]}

Lai, Hsiu-Chi ^{[1
]}

机构：

[1] Natl Chung Cheng Univ, Dept Mech Engn, Chiayi 621, Taiwan

来源：

JOURNAL OF SOUND AND VIBRATION | 2009年 / 323卷 / 1-2期

关键词：

SYSTEM-IDENTIFICATION; PARAMETER-IDENTIFICATION; NONLINEAR-SYSTEMS; REAL DATA; TRANSFORM; VIBRATION; MODEL;

D O I：

10.1016/j.jsv.2009.01.029

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

This study addresses the identification of damping ratios and natural frequencies in linear structural dynamic systems. A previously proposed method based on the Morlet wavelet transform of the system's response is investigated analytically. The method can be applied to single- or multi-degree of freedom, lightly or heavily damped systems. It utilizes a relationship between natural frequency, damping ratio and the continuous Morlet wavelet transform of the system response. It is found that the validity of the relationship depends on the scaling factor a, translation factor b, and the frequency parameter omega(0) of the Morlet wavelet transform. A general guideline of choosing a, b, and omega(0) is provided in this paper. Both numerical and experimental results verify the theoretical analysis. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：130 / 147

页数：18

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