Three-mode coupling of symmetric and antisymmetric Lamb waves in plates with finite corrugations

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Omar R AsfarJean-Louis Izbicki

Abstract

Coupled-mode equations governing the amplitudes of the higher-order symmetric Lamb modes S1 and S2 with the antisymmetric mode A2 in an infinite elastic plate with sinusoidal surface corrugation over a finite length are obtained via multiple-scales analysis. This phenomenon of threemode coupling is observed when the wavenumbers k(s1) and k(s2) of the symmetric modes and k(A2) of the antisymmetric mode satisfy the simultaneous resonance conditions k(s1) - k(A2) = k(w) and k(A2) - k(s2) = k(w), where k(w) is the wavenumber of the sinusoidal corrugation. Near resonance, the coupled amplitude equations are solved exactly as an initial-value problem and it is seen that the modes are transmitted through the grating without reflection. Complete conversion from the symmetric modes into the antisymmetric mode is observed at periodic intervals along the grating when the resonance conditions are exactly satisfied. The effect of detuning away from resonance also shows propagation without reflection with periodic energy exchange. In the latter case, the modes couple without complete conversion. This phenomenon of mode conversion is confirmed by the results of an experiment on an aluminum plate with a triangular grating excited with the S2 s...Continue Reading

References

Jun 8, 2007·The Journal of the Acoustical Society of America·Lin Zhou, Gregory A Kriegsmann
Nov 13, 2007·Physical Review Letters·Ming-Hui LuNai-Ben Ming
Sep 4, 2008·Physical Review Letters·Héctor EstradaFrancisco Meseguer
Oct 9, 2009·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Maxime BavencoffeJean-Louis Izbicki
Aug 4, 2010·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Omar R AsfarMuhammad A Hawwa
Jan 30, 2013·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Omar AsfarJean-Louis Izbicki

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