The transmission of sound through an inhomogeneous anisotropic layer adjoining viscous liquids

The problem of the reflection and transmission of a plane sound wave throug h a plane inhomogeneous elastic layer, the material of which possesses a ge neral form of anisotropy while the liquids adjoining it are viscous, is con sidered. An analytic description of the acoustic fields outside the layer i s obtained. The boundary-value problem for the system of ordinary different ial equations, constructed in order to determine the displacement field in the elastic layer, is reduced to problems with initial conditions. The abso rption coefficient is calculated numerically. (C) 1999 Elsevier Science Ltd . All rights reserved.