ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Application of Array Wideband Lamb Wave in Structural Damage Detection
Received date: 2013-09-06
Revised date: 2013-10-26
Online published: 2013-11-22
Supported by
National Natural Science Foundation of China (50905141); Research Fund for the Doctoral Program of Higher Education of China (Priority Developing Area)(20126102130004); Program for New Century Excellent Talents in University (NCET-10-0078); NPU Foundation for Fundamental Research (NPU-FFR-JC20110258)
Spatial spectrum estimation in array signal processing could be used to identify and locate the signal source, so the structural damage is detected by the Lamb wave received from sensor array on structure in this paper. Generally, most of spatial spectrum estimation research are under the narrow band signal assumption, meanwhile, Lamb wave propagation in most research is considered as a kind of narrow band signal in order to reduce the wave dispersion effects. However, Lamb wave signal should be modulated as a kind of wideband signal because of unrealizable infinite narrow signal excitation. Thus, incoherent signal subspace method (ISM) is applied in array Lamb wave wideband signal processing so as to locate single structural damage in this paper. Then, coherent signal subspace method (CSM) is used when two damages occur since the damage reflected signals are coherent. The damage detection results show excellent accuracy.
ZHANG Yu , YAN Yunju , YU Long , WANG Jianqiang . Application of Array Wideband Lamb Wave in Structural Damage Detection[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014 , 35(3) : 780 -787 . DOI: 10.7527/S1000-6893.2013.0444
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