Abstract
Lamb waves have the advantages of long propagation distance and low power loss, which are widely used in the field of structural health monitoring. However, the Lamb waves generated by conventional methods usually contain various modes, and the multi-modes Lamb waves always cause troubles for damage detection and localization. This research proposes a novel single-A0 mode Lamb wave generation technique: the actuator is attached on the side face of the beam structure, and the sensor is attached on the top or bottom surface, which is perpendicular to the side face, so the single-A0 mode Lamb wave can be generated. Due to the mode conversion effect of Lamb wave when it passes through a crack, the existence of crack can be determined by checking the existence of S0 mode. In addition, the location of the crack can also be localized accurately using the proposed algorithm. Numerical and experimental investigations are carried out to demonstrate the performance of the proposed method.
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