Order analysis for measurement of Lamb wave propagation distance

Liu, Xiaofeng, Veidt, M., Bo, Lin and Peng, Chang (2013) Order analysis for measurement of Lamb wave propagation distance. Measurement Science & Technology, 24 3: 035601.1-035601.10. doi:10.1088/0957-0233/24/3/035601

Author Liu, Xiaofeng
Veidt, M.
Bo, Lin
Peng, Chang
Title Order analysis for measurement of Lamb wave propagation distance
Journal name Measurement Science & Technology   Check publisher's open access policy
ISSN 0957-0233
Publication date 2013-03
Sub-type Article (original research)
DOI 10.1088/0957-0233/24/3/035601
Volume 24
Issue 3
Start page 035601.1
End page 035601.10
Total pages 10
Place of publication Bristol, United Kingdom
Publisher Institute of Physics Publishing
Collection year 2014
Language eng
Abstract The order analysis technique is utilized to directly measure the propagation distance of a Lamb wave without knowing its travel time and group velocity. The proposed algorithm relates the propagating wave-packets to the referenced wave-packet, instead of to an absolute propagating distance. The dispersion signal in the frequency domain is firstly resampled and interpolated according to the unwrapped phase derived from the referenced wave-packet. Subsequently, it is transformed into the angle domain stationary signal. The 'order' is defined as the propagating distance of dispersion wave-packet normalized by that of referenced wave-packet. Then the order spectrum is obtained by the Fourier transform of the equivalent angle signal. Finally, the wave-packet propagation distance is estimated precisely according to the mono-function relationship between the orders and the propagation distances. Synthetic and experimental results show that the proposed method enables the precise propagation distance estimation and mode identification regardless of the phenomenon of dispersion and multi-mode overlapping.
Keyword Lamb wave
Order analysis
Dispersion characteristic
Phase shift
Propagating distance
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article number 035601

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
School of Engineering Publications
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Created: Sun, 24 Mar 2013, 00:28:43 EST by System User on behalf of Examinations