Structural damage acoustic emission information enhancement through acoustic black hole mechanism

To obtain weak structure damage information, existing methods basically enhance the signal detected by an acoustic emission sensor. There is a risk that the sensor cannot obtain the structural damage information. In response to this problem, this study presents a novel method to enhance the acoustic emission information before it reaches the sensor based on acoustic black holes. First, the enhancement effect of acoustic black holes on acoustic emission signals was determined by simulations. Then, the enhancement effects of the geometric parameters of the acoustic black holes on acoustic emission signals were studied in detail, and the selection method of the best geometric parameters in practical applications was obtained. Finally, broken-lead experiments were performed on the plate to verify the ability and regularity of the proposed method. The results show that the presented method has good prospects for enhancing acoustic emission information.