17 April 2013 Predictive modeling of PWAS-coupled shear horizontal waves
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Abstract
This paper discusses shear horizontal (SH) guided waves that can be excited with shear type piezoelectric wafer active sensors (PWAS). The paper starts with a review of the state of the art in SH waves modeling and their importance in non-destructive evaluation (NDE). This is followed by basic sensing and actuation equations of shear-poled PWAS transducers with appropriate electro-mechanical coupling coefficients. The electro-mechanical impedance of the SHPWAS transducer is studied. The equations for shear stress transfer between PWAS and the structure are developed. The amplitudes of shear horizontal wave modes are normalized with respect to the wave power; normal mode expansion (NME) method is used to account for superpositioning multimodal SH waves. Modal participation factors are presented to show the contribution of every mode. Model assumption includes: (a) straight crested guided wave propagation; (b) evanescent waves are ignored; and (c) ideal bonding between PWAS and structure with shear load transfer concentrated at PWAS tips. Power and energy transfer between PWAS and the structure is analyzed in order to optimize sensor size and excitation frequency for maximum wave energy production for a given source. The paper ends with summary, conclusion and suggestion of future work.
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Ayman Kamal, Ayman Kamal, Bin Lin, Bin Lin, Victor Giurgiutiu, Victor Giurgiutiu, } "Predictive modeling of PWAS-coupled shear horizontal waves", Proc. SPIE 8695, Health Monitoring of Structural and Biological Systems 2013, 86950F (17 April 2013); doi: 10.1117/12.2009399; https://doi.org/10.1117/12.2009399
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