Title: Determination of group velocity of propagation of Lamb waves in aluminium plate using piezoelectric transducers
Authors: Lašová, Zuzana
Zemčík, Robert
Citation: Applied and Computational Mechanics. 2017, vol. 11, no. 1, p. 1-10.
Issue Date: 2017
Publisher: University of West Bohemia
Document type: článek
URI: http://hdl.handle.net/11025/26132
ISSN: 1802-680X (Print)
2336-1182 (Online)
Keywords: Lambovy vlny;piezoelektrické měniče;2D-FFT;vlnová transformace
Keywords in different language: Lamb waves;piezoelectric transducers;2D-FFT;wavelet transform
Abstract: A prior knowledge of group velocities of Lamb wave modes is a key for analysis of time signals in guidedwave based structural health monitoring. The identification of multiple wave modes may be complicated due to dependency of group velocity on frequency (dispersion). These dependencies for infinite plate of constant thickness can be calculated by a numerical solution of analytic equation. Two alternative approaches to determine group velocities of zero-order Lamb wave modes in aluminum plate were used in this work: Two-dimensional Fast Fourier Transform (2D-FFT) and methods of time-frequency processing. 2D-FFT requires a high number of time signals in equidistant points, therefore it was applied on data from finite element analysis of wave propagation in the plate. Group velocities for chosen frequencies were also determined using wavelet transform (WT) of signals as differencies of times of arrival measured by a pair of piezoelectric transducers. The results from 2D-FFT and wavelet transform were compared to the analytic solution.
Rights: © 2017 University of West Bohemia. All rights reserved.
Appears in Collections:Volume 11, number 1 (2017)
Články / Articles (KME)
Volume 11, number 1 (2017)

Files in This Item:
File Description SizeFormat 
Lasova.pdfPlný text1,63 MBAdobe PDFView/Open

Please use this identifier to cite or link to this item: http://hdl.handle.net/11025/26132

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.