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The model will be used to study sound fields in rooms with local- or extended-reaction multilayer surfaces. Beam-tracing predictions were compared with those by a method-of-images model with phase. The number of beams, the reflection order, and the frequency resolution required to obtain accurate results were investigated. The beam-tracing model was validated in the cases of three idealized room configurations-a small office, a corridor, and a small industrial workroom-with simple boundary conditions. The test surfaces were a glass plate, double drywall panels, double steel panels, a carpeted floor, and a suspended-acoustical ceiling. The transfer-matrix model was validated by comparing predictions with those by theory, and with experiment. The new model consisted of the transfer-matrix model integrated into the beam-tracing algorithm. Biot theory was used in the transfer-matrix formulation of the porous layer. Room surfaces were modeled as multilayers of fluid, solid, or porous materials. A triangular beam-tracing model with phase, and a transfer-matrix approach to model the surfaces, were involved. This paper presents the development of a wave-based room-prediction model for predicting steady-state sound fields in empty rooms with specularly reflecting, multilayer surfaces.
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