RESUMO

Propagation of harmonic waves in the hydroelastic system consisting of in-homogeneous elastic layer placed between the two compressible fluids of different physical properties is investigated. Numerical analysis of the dispersion equation is carried out for phase velocities less than the greater sound velocity of two fluids. The dispersion equation has two real roots corresponding to quasisymmetric and quasiantisymmetric oscillations of the layer. The two limiting cases are considered: the layer between the two fluids of different properties and the inhomogeneous layer between the same fluids. The wave modes are presented for longitudinal and transverse displacements, shear and normal stresses in elastic layer. It is established from the analysis of wave modes that inhomogeneity of the layer can lead to a strong concentration of wave fields both in central part (inhomogeneity of the first type), and near boundaries of the layer (inhomogeneity of the second type).