Lamb Wave Based Rapid Damage Area Identification on Composite Plates Though Virtual Sparse Array Features
Due to the advantages of sparse and dense sensor arrays in Lamb wave based damage monitoring,this paper proposed an array virtual sparse features based damage location method using finite element technique.Firstly,the monitored structure was discretized into several sub-regions and their nodes in each sub-region were defined as sparse points,then the time-of-arrival(TOA)from each sparse point to the sensor array are obtained and constructed as a sparse array features library using finite ele-ment simulation.Secondly,based on the signal space construction idea of dense array,the TOA vector of measured signal is estab-lished.Finnally,the damage area can be quickly located by comparing the measured vector with the virtual sparse characteristics li-brary.The simulation results on glass fiber composite laminates show that the method can quickly and accurately locate the dam-age area.
Damage Area IdentificationComposite PlateSensors ArrayVirtual Sparse Feature
万方数据
维普
