Open AccessDispersion analysis of Lamb waves with narrow frequency bands
Author(s) -
Fucai Li,
Guowang Meng
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.4265
Subject(s) - lamb waves , dispersion (optics) , acoustics , optics , physics , wavelet , ridge , frequency domain , acoustic dispersion , time domain , surface wave , computational physics , mathematical analysis , computer science , mathematics , geology , paleontology , artificial intelligence , computer vision
Dispersion is the intrinsic characteristic of Lamb waves, which influences the effective applications of Lamb waves in plate-like structures. The continuous wavelet transform (CWT) was applied to the Lamb wave signals with narrow frequency band captured from aluminium structures. The CWT-based contour and ridge were therefore searched in the time-scale domain. The unavoidable dispersion characteristic was used in this paper to distinguish the mode of each wave package and pinpoint these packages at each scale for determining the actual group velocities of dispersion curves. Analysis results demonstrate that the proposed approach is effective in dispersion analysis and wave mode differentiation.