  The vibro-acoustic response of a structure-liner-fluid system is predicted by
application of a patch impedance coupling methodology. In contrast to existing
numerical approaches, impedance matrices of structure and liner are determined
by a direct experimental approach, avoiding the requirement of material
parameters. Emphasis is placed on poroelastic lining materials. The method
accounts for surface input and transfer terms and for cross and cross-transfer
terms through the specimen. A single test-rig characterisation procedure for
layered poroelastic media is proposed. The specimen is considered as a single
component -- no separation of layers is necessary. Problem specific boundary
conditions for skeleton and fluid, which may cause non-reciprocal cross terms,
are dealt with by the procedure. Methods of measurement for the assessment of
impedance matrices are presented and their accuracy and limitations are
discussed. An air gap correction method for surface impedance measurements is
presented.
