Application of Wavelet Transform as a Signal Processing Method for Defect Detection using Lamb Waves: Experimental Verification

Document Type : Research Paper

Authors

1 School of Mechanical Engineering, University of Tehran, Tehran, Iran

2 School of Engineering, University of Tehran, Tehran, Iran

Abstract

A Lamb wave-based crack detection method for aluminum plates health monitoring is developed in this paper. Piezoelectric disks are employed to actuate and capture the Lamb wave signals. The position of crack is assumed to be aligned with the sensor and actuator.  Extraction of high quality experimental results of lamb wave propagation in a plate-like structure is considerably complicated due to phenomena such as multimode excitation, wave dispersion, material attenuation, and boundary reflection. The main goal of this study is to utilize a customized wavelet transform technique to purify the captured Lamb wave signals. Significant features of these signals were then extracted from the wave energy distribution. Experimental results show that the developed method has a promising capability in identification of crack positions.

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References

] Tua, P.S., Quek, S.T., and Wang, Q., “Detection of Cracks in Plates using Piezo Actuated Lamb Waves”, Smart Materials and Structures, Vol. 13, No. 4, pp. 643-660, (2004).
 
[2] Benmeddour, F., Grondel, S., Assaad, J., and Moulin, E., “Study of the Fundamental Lamb Modes Interaction with Symmetrical Notches”, NDT & E International Vol. 41, pp. 1–9, (2008).
 
[3] Rose, J.L., Pelts, S.P., and Quarry, M.J., “A Comb Transducer for Mode Control in Guided Wave”, NDE, IEEE Ultrasonics Symposium, pp. 1033–1036, (1997).
 
[4] Grondel, S., Paget, C., Delebarre, C., Assaad, J., and Levin, K., “Design of Optimal Configuration for Generating A0 Lamb Mode in a Composite Plate using Piezoceramic Transducers”, Journal of the Acoustical Society of America, No. 112, pp. 84–90, (2002).
 
[5] Moulin, E., Assaad, J., and Delebarre, C., “Modeling of Lamb Waves Generated by Integrated Transducers in Composite Plates using a Coupled Finite Element Normal Modes Expansion Method”, Journal of the Acoustical Society of America, No. 107, pp. 87–94, (2000).
 
[6] Gao, W., Glorieux, C., and Thoen, J., “Laser Ultrasonic Study of Lamb Waves: Determination of the Thickness and Velocities of a Thin Plate”, International Journal of Engineering Science, No. 41, pp. 219–228, (2003).
 
[7] Huang, N.E., Shen, Z., Long, S.R., Wu, M.C., Shih, H.H., Zheng, Q., Yen, N., Tung, C.C., and Liu, H.H., “The Empirical Mode Decomposition and the Hilbert Spectrum for Nonlinear and Non-stationary Time Series Analysis”, Proceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, Vol. 454, No. 1971, pp. 903-995, (1998).
 
[8] Quek, S.T., Tua, P.S., and Wang, Q., “DetectingAnomalies in Beams and Plate Based on the Hilbert–Huang Transform of Real Signals”, Smart Materials and Structures, No. 12, pp. 447–460, (2003).
 
[9] Lemistre, M., and Balageas, D., “Structural Health Monitoring System Based on Diffracted Lamb Wave Analysis by Multi-resolution Processing”, Smart Materials and Structures, No. 10, pp. 504–511, (2001).
 
[10] Silva, M.Z., Gouyon, R., and Lepoutre, F., “Hidden Corrosion Detection in Aircraft Aluminium Structures using Laser Ultrasonics and Wavelet Transform Signal Analysis”, Ultrasonics, No. 41, pp. 301–305, (2003).
 
[11] Rose, J. L., “Ultrasonic Waves in Solid Media”,Cambridge University Press,Cambridge, United Kingdom, (1999).
 
[12]Su, Z., and Ye, L., “Identification of Damage using Lamb Waves, from Fundamentals to Application”, Springer Press, Verlag Berlin Heidelberg, (2009).
Iranian Journal of Mechanical Engineering Transactions of the ISME
Volume 13, Issue 2 - Serial Number 19
September 2012
Pages 81-95

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