FEATURES OF LOCALIZATION OF WAVE ENERGY AT ROUGH SURFACES OF PIEZODIELECTRIC WAVEGUIDE
Journal Title: Հայաստանի գիտությունների ազգային ակադեմիայի տեղեկագիր․ Մեխանիկա - Year 2017, Vol 70, Issue 1
Abstract
Propagation of high-frequency electro-elastic normal wave signal in a composite waveguide is investigated. The composite waveguide consists of a base piezoelectric layer with rough surfaces, which respectively are filled with an ideal conductor and ideal dielectric. The problem is solved by the method of virtual cross sections and input of Magneto Elastic Layered Systems (MELS) hypotheses. The influence of surfaces roughness, as well as and the influence of surface smoothness (the effects of different physical and mechanical boundary conditions) on the process of propagation of high frequency electro-elastic normal wave signal is discussed. The behaviors of wave amplitude and frequency characteristics in the composite waveguide are numerically investigated at the propagation of normal wave signal. It is shown that if the surface roughness of the piezoelectric layer is not filled, only one shortwave mode occurs. The filling of the surface roughness with dielectric and conductor, leads to the appearance of up to four such wave modes, depending on the length of the wave signal. The dispersion dependencies for all possible characteristic modes of shear elastic waves are given. It is shown that on the propagation of slow waves, occurs frequency zone of silence at certain wave lengths.
Authors and Affiliations
A. Avetisyan
Keywords
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