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Shock and Vibration
Volume 19, Issue 4, Pages 585-596

Improvement of Accuracy in Damage Localization Using Frequency Slice Wavelet Transform

Xinglong Liu,1,2 Zhongwei Jiang,2 and Zhonghong Yan3

1National Engineering Laboratory for System Integration of High Speed Train (south), CSR Qingdao Sifang Co. Ltd, Qingdao, China
2Department of Mechanical Engineering, Engineering Faculty, Yamaguchi University, Ube, Japan
3Biomedical Department, Chongqing University of Technology, Chongqing, China

Received 21 July 2011; Revised 13 September 2011

Copyright © 2012 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Damage localization is a primary objective of damage identification. This paper presents damage localization in beam structure using impact-induced Lamb wave and Frequency Slice Wavelet Transform (FSWT). FSWT is a new time-frequency analysis method and has the adaptive resolution feature. The time-frequency resolution is a vital factor affecting the accuracy of damage localization. In FSWT there is a unique parameter controlling the time-frequency resolution. To improve the accuracy of damage localization, a generalized criterion is proposed to determine the parameter value for achieving a suitable time-frequency resolution. For damage localization, the group velocity dispersion curve (GVDC) of A0 Lamb waves in beam is first accurately estimated using FSWT, and then the arrival times of reflection wave from the crack for some individual frequency components are determined. An average operation on the calculated propagation distance is then performed to further improve the accuracy of damage localization.