31 March 2011 Multiple component mode conversion coefficients via Lamb wave polarization measurements
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The paper presents a method of quantifying the mode conversion of Lamb waves within a 1D structure from a notch-like asymmetric damage using both in-plane and out-of-plane velocity/displacement measurements. The method is applied to data recorded from a Scanning Laser Doppler Vibrometer, and likewise to numerical studies from a plane strain finite element model. A filtering procedure is implemented, and the reflected, converted, and transmitted waves are separated in the frequency/wavenumber domain, and then integrated spatially in the space/frequency domain. An accurate experimental technique for capturing the multiple components from a single laser head is verified. Based on an initial in-plane excitation, the spatially-integrated multiple component mode conversion coefficients are shown to mitigate experimental noise compared to single component mode conversion coefficients.
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James T. Ayers, James T. Ayers, Nicoleta Apetre, Nicoleta Apetre, Massimo Ruzzene, Massimo Ruzzene, } "Multiple component mode conversion coefficients via Lamb wave polarization measurements", Proc. SPIE 7984, Health Monitoring of Structural and Biological Systems 2011, 798411 (31 March 2011); doi: 10.1117/12.880065; https://doi.org/10.1117/12.880065

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