Finite Element Study of Perfect Sound Absorbing Porous Material with Periodic Conical Hole Profile
Abstract
Porous materials are widely used in several engineering applications for noise reduction. The acoustic performance of these materials at low frequency is low and depends on their acoustic penetration depth or critical depth. When the thickness of the porous material is equal to the critical depth, the sound absorption reaches its asymptotic limit so that a further increase in the material thickness does not improve the absorption coefficient. To overcome this limitation, a porous material design with a periodically distributed conical hole is proposed and its acoustic performance is investigated using the finite element method. Compared to a conventional porous layer, the total mass of the proposed design is reduced and its sound absorption coefficient is significantly improved over a large frequency band. This material design with periodic conical hole is coupled with other conventional porous materials to create a multi-layered system that shows efficient sound absorption performance. The proposed material design can be used as anechoic termination and help in several other applications for noise reduction.
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