Resonance transmission and backward leaky waves in the coupled system: Ultrasound transducer acoustic uid immersed plate

The present research is a continuation of our DD'15 and DD'16 contributions [1, 2], in which a set of analytically-based computer models for the coupled time-harmonic oscillation generated by a given source in acoustic fluid with an immersed elastic plate has been developed. This study is focused on the backward leaky mode phenomenon and the effect of increased energy transfer through the plate at those frequencies [3,4]. It is carried out in comparison with the experimental and FEM results [4], providing an insight into the mechanism of increased energy flux through the plate. Specific paths of time-averaged energy fluxes from the source to infinity are illustrated by the plots of energy streamlines. The transformation of the classical Lamb waves into the leaky guided waves, especially in the backward wave range, is also numerically illustrated and discussed.