Lamb waves generated by high-speed blunt body penetrating a double-layer structure are subject to the effect of complex structural interfaces and test environment in the process of propagation,resulting in the effec-tive signal containing damage characteristics easily disturbed by other factors.This study takes the double-layer steel plate structure as the object of study.The propagation characteristics of Lamb wave generated by penetration in steel plate are studied.For the nonlinear shock source signal,the transient non-smooth signal generated by the in-trusion is analyzed and reconstructed based on the HHT(Hilbert-Huang Transform),and the Lamb wave S0 mode signal containing the shock source features is extracted.The results show that the proposed method can effectively e-liminate the influence of other incoherent clutter in complex environment,and the reconstructed signal improves the localization accuracy.
维普
万方数据