Wavelet-based Wavenumber Filtering for Damage Detection with a Scanning Laser Sensing System



Published Jul 14, 2017
DuHwan Kim Michael D. Todd Gyuhae Park


This paper describes the use of wavelet-based wavenumber filtering for damage detection with a signal-frequency standing wave excitation on thin plate structures. Using a single, fixed frequency excitation from a mounted piezoelectric transducer, the full standing wave-field could be obtained using a Laser Doppler Vibrometer (LDV) with a mirror-tilting device. After scanning, a wavelet-based wavenumber filtering is performed to determine dominant wavenumber components, which could be used for indicative of structural damage. Mapping processes based on the wavelet-based wavenumber filtering is then carried out for damaged area visualization. To demonstrate the proposed techniques, several experiments are performed on thin walled structures with several different types of damage (corrosion, debonding). The results demonstrate that the techniques are very effective in localizing damage with the potential for the improved speed and the performance for damage detection.

Abstract 37 | PDF Downloads 33




Flynn, E. B. & G. J. Jarmer. (2013). High-speed, noncontact, baseline-free imaging of hiddden defects using scanning laser measurements of steady-state ultrasonic vibration. Structural Health Monitoring, pp. 1186-1193.
Flynn, E. B. (2014). Embedded Multi-Tone Ultrasonic Excitation and Continuous-Scanning Laser Doppler Vibrometry for Rapid and Remote Imaging of Structural Defects. Proceedings of EWSHM-7th European Workshop on Structural Health Monitoring, July 8–11. La Cité, Nantes, France https://hal.inria.fr/hal-01021054
Rucka, M & Wilde, K. (2006). Application of Continuous Wavelet Transform in Vibration Based Damage Detection Method for Beams and Plates. Journal of Sound and Vibration. vol. 297, pp. 536-550.
Wei Xu, Maciej Radzienki, Wieslaw Osttachowicz & Maosen Cao. (2013). Damage Detection in Plates Using Two-Dimensional Directional Gaussian Wavelets and Laser Scanned Operating Deflection Shapes. Structural Health Monitoring, vol. 12(5-6), pp. 457-468.
Andrzej Katunin & Piotr Przystalka. (2014). Damage Assessment in Composite Plates Using Fractional Wavelet Transform of Modal Shapes with Opimized Selection of Spatial Wavelets. Engineering Application of Artificial Intelligence. vol. 30, pp. 73-85.
Jung-Ryul Lee, Chen Ciang Chia, Hye Jin Shin, Chan-Yik Park & Dong Jin Yoon. (2011). Laser ultrasonic Propagation Imaging Method in the Frequency Domain Based on Wavelet Transformation. Optics and Lasers in Engineering, vol. 49, pp. 167-175.
Katunin, A & Holewik, B (2013). Crack Identification in Composite Elements with Non-Linear Geometry Using Spatial Wavelet Transform. Archives of Civil and Mechanical Engineering, vol. 13, pp. 287-296.
Regular Session Papers