Baseless damage localization in composites based on symmetric damage by Lamb wave spatial inversion
In the actual damage detection process of composite materials,the baseline data is difficult to obtain and inevitably affected by the operation and environmental conditions,which makes the detection more difficult.Based on the symmetry failure principle of Lamb wave space inversion,the non-baseline method was used to locate the multi-damage of composite plate structures.Through the exchange excitation to receive the transducer sequence,the direct wave packet in the forward-back propagation Lamb wave was obtained,and the difference of signal ampli-tude and phase was analyzed,the damage path was extracted effectively.Then the defect was located by DBSCAN and K-means cluster algorithm.The effectiveness of the method was verified by experiments,and the traditional probabilistic imaging algorithm was compared with the clustering algorithm.The results show that,compared with the probabilistic imaging algorithm,the positioning accuracy is obviously improved.In addition,the problem of blind area in the detection area is effectively solved by optimizing the parallel array,and the single defect and doub-le defect location of the composite plate is realized by combining the D-K algorithm.
万方数据
维普
