Using cross-correlations of elastic diffuse fields for attenuation tomography of structural damage (L)

被引:12
作者
Duroux, Adelaide [1 ]
Sabra, Karim G. [1 ]
Ayers, James [1 ]
Ruzzene, Massimo [1 ]
机构
[1] Georgia Inst Technol, Sch Mech Engn, Atlanta, GA 30332 USA
关键词
acoustic field; acoustic tomography; flaw detection; structural acoustics; surface acoustic waves; ultrasonic absorption; ultrasonic materials testing; vibrations; GUIDED-WAVES; MEDIA;
D O I
10.1121/1.3397447
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
A scanning laser Doppler vibrometer is used to measure, at multiple grid points, the diffuse vibrations (50-150 kHz) propagating over a thin aluminum plate with complex geometry. These diffuse vibrations were generated by a few pulsed laser impacts randomly distributed outside of the measurement grid. The pairwise cross-correlations of the diffuse field recorded at all grid points provided an estimate of the first antisymmetric Lamb mode direct arrival between these grid points. Attenuation tomography imaging of a simulated structural damage is performed based on the relative amplitude variations of these direct arrivals between the damaged and undamaged conditions. (C) 2010 Acoustical Society of America. [DOI: 10.1121/1.3397447]
引用
收藏
页码:3311 / 3314
页数:4
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