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Title: Frequency-sweep examination for wave mode identification in multimodal ultrasonic guided wave signal
Authors: Fateri, S
Boulgouris, NV
Wilkinson, A
Balachandran, W
Gan, T-H
Keywords: Ultrasonic guided waves;Wave modes;Geometry
Issue Date: 2014
Publisher: Institute of Electrical and Electronics Engineers Inc.
Citation: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2014, 61 (9), pp. 1515 - 1524
Abstract: Ultrasonic guided waves can be used to assess and monitor long elements of a structure from a single position. The greatest challenges for any guided wave system are the plethora of wave modes arising from the geometry of the structural element which propagate with a range of frequency-dependent velocities and the interpretation of these combined signals reflected by discontinuities in the structural element. In this paper, a novel signal processing technique is presented using a combination of frequency-sweep measurement, sampling rate conversion, and Fourier transform. The technique is applied to synthesized and experimental data to identify different modes in complex ultrasonic guided wave signals. It is demonstrated throughout the paper that the technique also has the capability to derive the time of flight and group velocity dispersion curve of different wave modes in field inspections. © 2014 IEEE.
Description: This article has been made available through the Brunel Open Access Publishing Fund.
ISSN: 0885-3010
Appears in Collections:Brunel OA Publishing Fund
Dept of Electronic and Computer Engineering Research Papers

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