4 April 2012 Multi-physics modeling of sensor-structure interaction for quantitative acoustic emission
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The influence of mechanical noise in an AE testing still obscures its successful application in monitoring various structures and systems. While advances in pattern recognition algorithms are helpful to differentiate relevant data from captured noise, the algorithms fail if the characteristics of relevant data are unknown. The ability to accurately model elastic waves using numerical methods offer a potential to understanding of frequency content of elastic waves. However, the oscillatory nature of the wave equation requires fine meshing for a stable numerical approximation using classical finite element models. Considering the size of civil structures, numerical modeling of full scale geometry is not feasible. In this study, spectral element approach is implemented for modeling elastic waves in sub-scales. The transfer function of a typical piezoelectric sensor is taken into consideration for identifying the output signal detected by the AE sensor in relation to the input signal and the transfer function of the medium. The approach is demonstrated for 1D and 2D structures and compared with conventional finite element model using COMSOL Multiphysics program. The comparison includes numerical efficiencies and computation times of spectral element and classical finite element.
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Zahra Heidary, Zahra Heidary, Didem Ozevin, Didem Ozevin, } "Multi-physics modeling of sensor-structure interaction for quantitative acoustic emission", Proc. SPIE 8347, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2012, 83471U (4 April 2012); doi: 10.1117/12.914889; https://doi.org/10.1117/12.914889

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