基于最大相似原理的主动Lamb波损伤检测方法研究

onsidering the aliasing problem of boundary reflected wave and damage reflected wave, an active Lamb wave damage signal decomposition algorithm based on maximum similarity is proposed. Damage-reflected signal and boundary-reflected signal on the basis of analysis of lamb wave propagatioTB302.5n characteristics are simulated, the various parameters of the synthesis of the above two signals are then optimized through genetic algorithm based on similarity index in order to make the similarity between the synthetic signal and the target signal reach the maximum. Finally, damage is localized through Time Of Flight (TOF). The simulation results show that this method can accurately extract the damage reflected wave from the aliasing waves.