Damage Detection for Structural Health Monitoring Using Ultrasonic Guided Waves

Abstract:

The use of ultrasonic guided waves for damage detection suffers from the multi-modes and dispersion. Much attention has been paid to transducer design and excitation frequency chosen to suppress the multiple modes and dispersion. However, little attention has been paid to complex signal processing. In this paper, the dispersive propagation of the guided waves are firstly reviewed. And then the matching pursuit method is introduced as a feature extraction algorithm. In order to present well the characteristic of the guided waves signal, a dispersive dictionary is designed based on the guided waves propagation. A two-stage pursuit method consisted of coarse and fine matching is used. At last, the proposed method is verified by finite element simulation and successfully extracted damage related dispersive pulses from measured noisy signal.

• Periodical: Key Engineering Materials (Volumes 525-526)
• Pages: 433-436
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.525-526.433
• Online since: November 2012
• Authors: Hong Yuan Li, Hong Xu
• Keywords: Damage Detection, Dispersion, Guided Wave, Matching Pursuit

References

[1] P. D. Wilcox: IEEE Trans. on Ultra, Ferroelectrics and Frequency Control Vol. 50 (2003), p.419.

[2] Mallat S, and Zhang Z: IEEE Transactions on Signal Processing Vol. 41 (1993), p.3397.

[3] S. Qian and D. Chen: Signal Processing Vol. 36 (1994), p.1.

[4] J. C. Hong, K. H. Sun and Y. Y. Kim: IEEE Trans on Ultra, Ferroelectrics and Frequency Control Vol. 53 (2006), p.592.