Ultrasonic NDE of thin Composite plate Based on an enhanced Wigner-Ville distribution
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.
NDE chirplet decomposition composite Wigner-Ville distribution
Gaohui WU Jun SU Dezhi ZHU Huasong GOU Wulan SHENG Yan LI
School of Materials Science and Engineering, Harbin Institute of Technology,Harbin, Heilongjiang, P.O. Box 3023, No. 2 Yikuang Street, Harbin Institute of Technology, Harbin 150080, P. R. China
国际会议
第十七届世界无损检测会议(17th World Conference on Nondestructive Testing)
上海
英文
1050-1055
2008-10-25（万方平台首次上网日期，不代表论文的发表时间）