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ACOUSTIC EQUATIONS IN THE PRESENCE OF RIGID POROUS MATERIALS ADAPTED TO THE FINITE-DIFFERENCE TIME-DOMAIN METHOD

JOSÉ ESCOLANO

Telecommunication Engineering Department, Lineares Polytechnic School, University of Jaén, Spain

Signal, System and Telecommunications, Polytechnic School, University of Alicante, E-03080 Alicante, Spain

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and

BASILIO PUEO

Signal, System and Telecommunications, Polytechnic School, University of Alicante, E-03080 Alicante, Spain

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https://doi.org/10.1142/S0218396X07003287Cited by:2 (Source: Crossref)

Abstract

Finite-difference time-domain (FDTD) method has been successfully developed to model electromagnetic systems in recent years. Since acoustics and electromagnetism share certain undulatory properties, a natural adaptation of this technique has been developed too. Several acoustics problems, such as room acoustics, require the use of fibrous tangles to attenuate the propagation speed of sound waves. Notwithstanding, although free air acoustic propagation is known, FDTD technique is not developed yet to model fibrous materials. To characterize this behavior, only a few and measurable set of parameters must be considered. In this paper, a new approach for modeling fibrous materials analysis using FDTD is presented and validated. A set of simulations covering various packing densities of a real fibrous material is performed. Loudspeaker cabinets, virtual acoustics and room acoustics are situations in which this method can be applied.

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