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The vibro-acoustic response of a structure-liner-fluid system is predicted byapplication of a patch impedance coupling methodology. In contrast to existingnumerical approaches, impedance matrices of structure and liner are determinedby a direct experimental approach, avoiding the requirement of materialparameters. Emphasis is placed on poroelastic lining materials. The methodaccounts for surface input and transfer terms and for cross and cross-transferterms through the specimen. A single test-rig characterisation procedure forlayered poroelastic media is proposed. The specimen is considered as a singlecomponent -- no separation of layers is necessary. Problem specific boundaryconditions for skeleton and fluid, which may cause non-reciprocal cross terms,are dealt with by the procedure. Methods of measurement for the assessment ofimpedance matrices are presented and their accuracy and limitations arediscussed. An air gap correction method for surface impedance measurements ispresented.

applied acoustics

Prediction of the vibroacoustic response of a structure-liner-fluid  system based on a patch transfer function approach and direct experimental  subsystem characterisation