Affiliations: National Engineering Laboratory for System Integration
of High Speed Train (south), CSR Qingdao Sifang Co. Ltd, Qingdao, China | Department of Mechanical Engineering, Engineering
Faculty, Yamaguchi University, Ube, Japan | Biomedical Department, Chongqing University of
Technology, Chongqing, China
Abstract: 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 A_{0} 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.
