A finite element model of perforated panel absorbers including viscothermal effects


Autoria(s): Carbajo San Martín, Jesús; Ramis-Soriano, Jaime; Godinho, Luís; Amado-Mendes, Paulo; Alba Fernández, Jesús
Contribuinte(s)

Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal

Acústica Aplicada

Data(s)

02/02/2016

02/02/2016

01/04/2015

Resumo

Most of the analytical models devoted to determine the acoustic properties of a rigid perforated panel consider the acoustic impedance of a single hole and then use the porosity to determine the impedance for the whole panel. However, in the case of not homogeneous hole distribution or more complex configurations this approach is no longer valid. This work explores some of these limitations and proposes a finite element methodology that implements the linearized Navier Stokes equations in the frequency domain to analyse the acoustic performance under normal incidence of perforated panel absorbers. Some preliminary results for a homogenous perforated panel show that the sound absorption coefficient derived from the Maa analytical model does not match those from the simulations. These differences are mainly attributed to the finite geometry effect and to the spatial distribution of the perforations for the numerical case. In order to confirm these statements, the acoustic field in the vicinities of the perforations is analysed for a more complex configuration of perforated panel. Additionally, experimental studies are carried out in an impedance tube for the same configuration and then compared to previous methods. The proposed methodology is shown to be in better agreement with the laboratorial measurements than the analytical approach.

Identificador

Applied Acoustics. 2015, 90: 1-8. doi:10.1016/j.apacoust.2014.10.013

0003-682X (Print)

1872-910X (Online)

http://hdl.handle.net/10045/52793

10.1016/j.apacoust.2014.10.013

Idioma(s)

eng

Publicador

Elsevier

Relação

http://dx.doi.org/10.1016/j.apacoust.2014.10.013

Direitos

© 2014 Elsevier Ltd.

info:eu-repo/semantics/restrictedAccess

Palavras-Chave #Perforated panels #Sound absorption #Navier-Stokes equations #FEM #Física Aplicada
Tipo

info:eu-repo/semantics/article