The evaluation of acoustic or electromagnetic fields induced in the interior of
inhomogeneous penetrable bodies by external sources is based on well-known volume
integral equations; this is particularly true for bodies of arbitrary shape and/or composition,
for which separation of variables fails. In this paper the investigation focuses on acoustic
(scalar fields) in inhomogeneous spheres of arbitrary composition, ie, with r-, θ-or even φ-
dependent medium parameters. The volume integral equation is solved by a hybrid …

The evaluation of acoustic or electromagnetic fields induced in the interior of
inhomogeneous penetrable bodies by external sources is based on well known volume
integral equations; this is particularly true for bodies of arbitrary shape and/or composition,
for which separation of variables fails. In this paper we focus the investigation to acoustic
(scalar fields) in inhomogeneous spheres of arbitrary composition, ie, with r-,(theta)-
dependent medium parameters. The volume integral equation is solved by a hybrid …