Damage detection for plate-like structure based on Lamb wave and time reversal theory

A damage detection method is presented by using Lamb wave and time frequency analysis. The propagation characteristics of Lamb waves in plate-like structure, with emphasis on group velocity and characteristic wave curves are investigated theoretically. Hilbert-Hung transform is applied to the wave signals in the time-frequency domain to enhance the time reversibility of Lamb wave in plate-like structure, then a damage imaging technique is developed by using the time reversal method.