Study on Recognize for Lamb Wave Test Signals Based on Finite Element Modeling

Abstract

In the defect test of plate-like structure, acousto-ultrasonic technique can stimulate a multi-mode Lamb wave. This paper used an FEM method to investigate the Lamb wave propagation, the simulating signals are decomposed and reconstructed by MP and compared with the theoretical parameter curve of the frequency dispersed curves. It was proved that matching pursuit based on tEP can accurately search the characteristic parameters of the signal, realize the rapid signal decomposition and reconstruction, and identify the defect signals.