Estimation of modal parameters for structurally damped systems using wavelet transform

被引：13
作者：
Sarparast, H. [1 ]
Ashory, M. R. [1 ,2 ]
Hajiazizi, M. [3 ]
Afzali, M. [4 ]
Khatibi, M. M. [4 ]
机构：
[1] Semnan Univ, Sch Mech Engn, Semnan, Iran
[2] Univ Tehran, Sch Mech Engn, Tehran, Iran
[3] Semnan Univ, Sch Civil Engn, Semnan, Iran
[4] Islamic Azad Univ, Dept Mech Engn, Semnan Branch, Semnan, Iran
来源：
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS | 2014年 / 47卷
关键词：
Modal parameters; Proportional structural damping; Morlet wavelet; STIFFNESS CHANGE; IDENTIFICATION; SHAPES; MASS;
D O I：
10.1016/j.euromechsol.2014.02.018
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
In this paper, a procedure is presented to determine the modal parameters of a system with proportional structural damping exited by an impact force. A Morlet wavelet transform with an adjusting parameter is used to estimate the natural frequencies and damping factors from free-decay responses of structure. Also a method is used for identification of mode shapes from the estimated natural frequencies of wavelet transform and the free responses of structure. It is shown that the mode shape identification method can average the data in the noisy environments and reduce the effect of noise. A numerical example as well as two experimental case studies on a beam and a trapezoidal concrete plate demonstrates the validity of method. (C) 2014 Elsevier Masson SAS. All rights reserved.
引用
收藏
页码：82 / 91
页数：10
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