Though ultrasonic phased array technology is more efficient than traditional manual ultrasonic testing method, automatic flaw classification is a challenge and still hasn’t been well solved. Whether the representative features can be extracted from each type of ultrasonic flaw signal is a key to influencing the accuracy rate of automatic flaw classification. In this paper, second generation wavelet transform (SGWT) is proposed as a flaw feature extraction method, having the advantages of high computation speed, simple structure and occupying less memory. After introducing the principle of SGWT, the SGWT-based feature extraction algorithm is analyzed. Separability measure based on Euclidean distance is introduced as the evaluation criterion to assess flaw feature extraction performance. For comparison, first generation wavelet packet transform (WPT), a common feature extraction method, is also adopted to extract flaw feature. The experiment result is indicated that the classification performance of SGWT-based feature extraction algorithm is improved than WPT-based feature extraction algorithm, and the classification speed of the former is almost two times of the latter, which is valuable for automatic flaw detection and classification of pipeline girth weld.
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2008 7th International Pipeline Conference
September 29–October 3, 2008
Calgary, Alberta, Canada
Conference Sponsors:
- International Petroleum Technology Institute and the Pipeline Division
ISBN:
978-0-7918-4858-6
PROCEEDINGS PAPER
Study of Feature Extraction Method in Ultrasonic Phased Array Testing for Long-Distance Pipeline
Xianglin Zhan
,
Xianglin Zhan
Tianjin University, Tianjin, China
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Shili Chen
,
Shili Chen
Tianjin University, Tianjin, China
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Zhoumo Zeng
,
Zhoumo Zeng
Tianjin University, Tianjin, China
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Shijiu Jin
,
Shijiu Jin
Tianjin University, Tianjin, China
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Likun Wang
,
Likun Wang
PetroChina Company Limited, Langfang, Hebei, China
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Pengchao Chen
Pengchao Chen
PetroChina Company Limited, Langfang, Hebei, China
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Jian Li
Tianjin University, Tianjin, China
Xianglin Zhan
Tianjin University, Tianjin, China
Shili Chen
Tianjin University, Tianjin, China
Zhoumo Zeng
Tianjin University, Tianjin, China
Shijiu Jin
Tianjin University, Tianjin, China
Likun Wang
PetroChina Company Limited, Langfang, Hebei, China
Pengchao Chen
PetroChina Company Limited, Langfang, Hebei, China
Paper No:
IPC2008-64181, pp. 297-300; 4 pages
Published Online:
June 29, 2009
Citation
Li, J, Zhan, X, Chen, S, Zeng, Z, Jin, S, Wang, L, & Chen, P. "Study of Feature Extraction Method in Ultrasonic Phased Array Testing for Long-Distance Pipeline." Proceedings of the 2008 7th International Pipeline Conference. 2008 7th International Pipeline Conference, Volume 2. Calgary, Alberta, Canada. September 29–October 3, 2008. pp. 297-300. ASME. https://doi.org/10.1115/IPC2008-64181
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