A Study on the Behavior of Ultrasonic Guided Wave Mode in a Pipe Using a Comb Transducer

Abstract:

A preliminary study of the behavior of ultrasonic guided wave mode in a pipe using a comb transducer for maintenance inspection of power plant facilities has been verified experimentally. Guided wave mode identification is carried out in a pipe using time-frequency analysis methods such as wavelet transform (WT) and short time Fourier transform (STFT), compared with theoretically calculated group velocity dispersion curves for longitudinal and flexural mode. The results are in good agreement with analytical predictions and show the effectiveness of using the time-frequency analysis method to identify the individual guided wave modes. And, It was found out that longitudinal mode (0, 1) is affected by mode conversion less than the other modes. Therefore, L (0, 1) is selected as a optimal mode for evaluating location of the surface defect in a pipe.

• Periodical: Key Engineering Materials (Volumes 297-300)
• Pages: 2182-2186
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.297-300.2182
• Online since: November 2005
• Authors: Ik Keun Park, Yong Kwon Kim, Youn Ho Cho, Won Joon Song, Yeon Shik Ahn, Yong Sang Cho, Gye Jo Jung
• Keywords: Comb Transducer, Dispersion Curve, Group Velocity, Mode Identification, Short Time Fourier Transform (STFT), Ultrasonic Guided Wave, Wavelet Transform (WT)

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