Damage Localization on Two-Dimensional Structure Based on Wavelet Transform and Active Lamb Wave-Based Method

Abstract:

Damage characterization was carried out by comparing single mode sensor signals collected before and after the damage event. By subtracting the signals of both conditions from each other, a scatter signal is produced which can be used for damage localization. By using Gabor wavelet to analyze single mode Lamb wave recorded before damage and scatter signal, the difference of time-of-flight can be obtained. Combining with the ellipse technique, the localization experiment on fiberglass plate of dimension 100×100×2mm is completed.

• Periodical: Materials Science Forum (Volumes 475-479)
• Pages: 2119-2122
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.475-479.2119
• Online since: January 2005
• Authors: Ge Peng, Shen Fang Yuan
• Keywords: Damage Localization, Gabor Wavelet, Lamb Wave

References

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[4] K. Kishimoto, H. Inoue, M. Hamada, and T. Shibuya: J. Appl. Mech. Vol. 62 (1995), pp.841-846 Fig. 5 Experimental system ( b) 0.

01.

02 0 20 40 60 80 100 Time(×10－7s) t2 ( a) 0.

1.

2 0 20 40 60 80 100 t1 Fig. 6 Gabor WT X axi s Y axi s.

[25] 3cm.

[25] 65cm.

[25] 45cm.

[18] 35cm PZT C PZT B PZT A Damage S Fi br e- gl ass pl at e Fig. 7 Fiberglass plate monitored - 0. 03 - 0. 015 0.

015.

03 0 0. 04 0. 08 x( m) y( m) Fig. 8 Localization result Real damage.