WAVE DYNAMICS OF COATED INCLUSIONS IN A VISCOELASTIC MEDIUM

A modified Rayleigh–Lamb equation is obtained, which takes into account the radial vibrations of a liquid drop that is covered with a viscoelastic shell, whose center contains a gas bubble, and which is placed in a viscoelastic medium. For the case of small vibrations of the inclusion, the heat transfer problem for gas, liquid phase, viscoelastic shell, and carrier liquid is solved. A dispersion equation is derived for a bubble medium. The influence of the inclusion shell and the viscoelasticity of the carrier phase on the dynamics of acoustic waves is investigated. Calculation results are compared with experimental data.