Abstract
Localization of bending waves has been observed for the first time for two-dimensional (2-D) acoustic wave propagation in an inhomogeneous (rough) composite system consisting of a steel plate decorated with Lucite blocks. A significant experimental feature of the localized modes is an exponential decay of the mode intensity from their peaked centers, with a decay length that increases as (fo — f)-1 when the mode frequency f approaches a quasi-mobility edge fo. The minimum attenuation length is of the order of a block diagonal and is about 40% of the bending wave’s wavelength. The experimental data, as well as results of finite-element calculations, suggest that the source of the localization phenomenon is strong scattering of the bending wave by shear resonances of the Lucite blocks. This result supports the theoretical prediction that resonant scattering enhances localization. It suggests that the bending-wave regime of a composite plate is particularly convenient for the study of classical localization in 2-D and at higher frequencies in 3-D. Finally, the generic nature of the localization phenomenon suggests its potential use as a tunable attenuation mechanism for bending waves.
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Cody, G., Ye, L., Zhou, M., Sheng, P., Norris, A.N. (1993). Experimental Observation of Bending Wave Localization. In: Soukoulis, C.M. (eds) Photonic Band Gaps and Localization. NATO ASI Series, vol 308. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-1606-8_26
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DOI: https://doi.org/10.1007/978-1-4899-1606-8_26
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