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Ultrasonic NDE of thin Composite plate Based on an enhanced Wigner-Ville distribution

By Gaohui Wu, Jun Su, Dezhi Zhu, Huasong Gou, Wulan Sheng and Yan Li


Due to the inherent inhomogeneous and anisotropy nature of the composite material, Ultrasonic waves suffer high acoustic attenuation and scattering effect, thus making data interpretation difficult. Especially for thin composite plate, echoes from the internal delamination interfere with surface echoes. In the present work, an enhanced Wigner-Ville distribution (EWVD) is obtained based on the chirplet decomposition and signal elimination. Echoes that are useless and affecting representation of flaws are eliminated from Wigner-Ville distribution (WVD). Details of ultrasonic signal, containing information of damage level in composite plate, are shown obviously and can be well explained through the EWVD. Compared to traditional WVD, the EWVD is effective in flaw identification and quantification. Key words: NDE, chirplet decomposition, composite, Wigner-Ville distributio

Year: 2012
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