Localization of Lamb Wave Scattering Source Based on Time-Frequency Analysis Conferences

abstract

• Considering the influence of Lamb wave dispersion on the precision of damage detection, a new detection method of scattering source based on time-frequency curves and ellipse localization method is proposed. Empirical mode decomposition(EMD) is used to decompose the scattering signal into finite narrowband signals, and a modified continuous wavelet transform(CWT) is further used to get the time-frequency distribution(TFD) of the detected signal, and the arriving time of different frequency component is estimated based on TFD. A series of location results can be obtained from different frequency components using ellipse localization method. The damage position can finally be estimated by synthesizing localization results at different frequencies. Experiments on aluminum plate are conducted to demonstrate the efficiency of the proposed method. EMD-CWT analysis can get precise time-frequency curves in highly dispersive low frequency band of A0 mode. The damage location results is more accurate and the influence from occasional factors can be suppressed by using the synthesized method.

authors

• Ma, Donglai
• Shi, Li Hua
• Fu, Shang Chen
• Cao, Hong Fu

publication date

• January 1, 2013

has subject area

• 09 Engineering (FoR)

published in

• Applied Mechanics and Materials  Journal

presented at event

• 2nd International Conference on Mechanical Engineering, Materials and Energy (ICMEME 2012)  Conference

keywords

• CWT
• Construction & Building Technology
• EMD
• Engineering
• Engineering, Mechanical
• Lamb wave
• Materials Science
• Materials Science, Multidisciplinary
• Science & Technology
• Technology
• Time-frequency analysis
• damage detection

Digital Object Identifier (DOI)

• 10.4028/www.scientific.net/amm.281.276

International Standard Book Number (ISBN) 13

• 978-3-03785-592-8

start page

• 276

end page

• 281

volume

• 281