Proceedings of the 2014 International Conference on Mechatronics, Electronic, Industrial and Control Engineering

Analysis of Ultrasonic Phased Array Signals Detected in CFRP

Authors
Xianglin Zhan, Yujie Cai, Tao Liu
Corresponding Author
Xianglin Zhan
Available Online November 2014.
DOI
10.2991/meic-14.2014.334How to use a DOI?
Keywords
ultrasonic phased array; nondestructive testing; carbon fiber reinforced plastic; signal processing; wavelet packet analysis
Abstract

Carbon Fiber Reinforced Plastic (CFRP) is an important material to make aircraft structure components. However, damage detection is very crucial to aircraft safety and the type of a detected defect is difficult to distinguish. Ultrasonic phased array (UPA) technology provides a possible solution. In this paper, characteristics of different defect signals and were studied in the frequency domain based on the wavelet packet analysis. Firstly, the principle of wavelet packet analysis is introduced. Secondly, a selection method of optimal wavelet on the basis of energy is proposed. The energy values of 41 wavelets are computed, and three kinds of wavelet basis are selected to extract the information entropy of the wavelet energy spectrum. Finally, a CFRP test block with four types of man-made defects is experimented. A-scan signals are collected by an UPA instrument. Information entropies are calculated and compared. From analysis, it can be seen that different types of defects can be differentiated by the corresponding entropy values. In addition, the entropy has high stability. In conclusion, information entropy can be used as an eigenvalue of UPA signals efficiently. This approach has laid the foundation for future research work.

Copyright
© 2014, the Authors. Published by Atlantis Press.
Open Access
This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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Volume Title
Proceedings of the 2014 International Conference on Mechatronics, Electronic, Industrial and Control Engineering
Series
Advances in Engineering Research
Publication Date
November 2014
ISBN
978-94-62520-42-4
ISSN
2352-5401
DOI
10.2991/meic-14.2014.334How to use a DOI?
Copyright
© 2014, the Authors. Published by Atlantis Press.
Open Access
This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

Cite this article

TY  - CONF
AU  - Xianglin Zhan
AU  - Yujie Cai
AU  - Tao Liu
PY  - 2014/11
DA  - 2014/11
TI  - Analysis of Ultrasonic Phased Array Signals Detected in CFRP
BT  - Proceedings of the 2014 International Conference on Mechatronics, Electronic, Industrial and Control Engineering
PB  - Atlantis Press
SP  - 1483
EP  - 1486
SN  - 2352-5401
UR  - https://doi.org/10.2991/meic-14.2014.334
DO  - 10.2991/meic-14.2014.334
ID  - Zhan2014/11
ER  -