A finite element model of perforated panel absorbers including viscothermal effects

Carbajo, J.; Ramis, J.; Godinho, L.; Amado-Mendes, Paulo; Fernández, Jesús Alba

doi:10.1016/j.apacoust.2014.10.013

Cited by 31 publications

(12 citation statements)

References 20 publications

(19 reference statements)

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“…In another recent study by Carbajo et al, 8 a method similar to that of Bolton and Kim 6 is used to study the interaction between perforations. Although the two works mentioned above propose a valuable methodology, there is a need for a more generalized definition of the end-correction coefficients and experimental validation of the results.…”

Section: Introductionmentioning

confidence: 99%

The influence of edge geometry on end-correction coefficients in micro perforated plates

Temiz

Arteaga

Efraimsson

et al. 2015

The Journal of the Acoustical Society of America

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Global expressions are proposed for end-correction coefficients in micro perforated plates (MPPs) using non-dimensional parameters. MPPs are sound absorbers with small perforation diameters such that the Stokes boundary layers fill up almost the entire perforation. Sound absorption does not only occur within the perforation, but also takes place just outside of it. The latter contribution plus the outside inertia effect on the transfer impedance of the MPP are referred to as end-corrections. In order to determine them, an analytical solution employing the very thin Stokes layer assumption has been derived. However, this assumption requires empirical coefficients in the end-corrections for accurate results. To explore the effects of various parameters a numerical model is used. This model is verified with open-end reflection coefficient measurements. The most prominent result from this study is that compared to plate thickness, the ratio of perforation diameter to Stokes layer thickness (Shear number) and edge geometry affect the end-correction coefficients more significantly. The effect of plate thickness can be neglected for practical purposes, therefore, expressions for the end-corrections in terms of Shear number and edge geometry are provided. The relative error of these expressions is <3% compared to the numerical results.

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Section: Introductionmentioning

confidence: 99%

The influence of edge geometry on end-correction coefficients in micro perforated plates

Temiz

Arteaga

Efraimsson

et al. 2015

The Journal of the Acoustical Society of America

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“…Eq. ( 15) (16) where v are the design variables and φ(v) is the objective function. The goal is to maximize the absorption coefficient, ranging from 0 (no absorption) to 1 (perfect absorption).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Even within the field of room acoustics, micro structures have found their everyday use. For example, the performance of absorbing panels, realized using micro-perforated plates, quarter-wave or Helmholtz resonators, is often very dependent on viscothermal dissipative effects [16,17].…”

Section: Introductionmentioning

confidence: 99%

Shape optimization of micro-acoustic devices including viscous and thermal losses

Andersen

Henrı́quez

Aage

2019

Journal of Sound and Vibration

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“…The absorption characteristics of MPP absorbers have been predicted analytically using the equivalent electrical circuits (for example, see [16]) or physical consideration of small perforations (for example, see [17]). In addition, the practical absorption performance in a relatively complex situation has been recently estimated by numerical methods like the finite element method (FEM) [18][19][20][21][22], the boundary element method (BEM) [23], the finite-difference time-domain (FDTD) method [24], and the computational fluid dynamics (CFD) [25,26].…”

Section: Introductionmentioning

confidence: 99%

Predicted Absorption Performance of Cylindrical and Rectangular Permeable Membrane Space Sound Absorbers Using the Three-Dimensional Boundary Element Method

et al. 2019

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Three-dimensional, permeable membrane space sound absorbers have been proposed as practical and economical alternatives to three-dimensional, microperforated panel space sound absorbers. Previously, the sound absorption characteristics of a three-dimensional, permeable membrane space sound absorber were predicted using the two-dimensional boundary element method, but the prediction accuracy was impractical. Herein, a more accurate prediction method is proposed using the three-dimensional boundary element method. In the three-dimensional analysis, incident waves from the elevation angle direction and reflected waves from the floor are considered, using the mirror image. In addition, the dissipated energy ratio is calculated based on the sound absorption of a surface with a unit sound absorption power. To validate the three-dimensional numerical method, and to estimate the improvement in prediction accuracy, the results are compared with those of the measurements and two-dimensional analysis. For cylindrical and rectangular space sound absorbers, three-dimensional analysis provides a significantly improved prediction accuracy for any shape and membrane sample that is suitable for practical use.

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A finite element model of perforated panel absorbers including viscothermal effects

Cited by 31 publications

References 20 publications

The influence of edge geometry on end-correction coefficients in micro perforated plates

The influence of edge geometry on end-correction coefficients in micro perforated plates

Shape optimization of micro-acoustic devices including viscous and thermal losses

Predicted Absorption Performance of Cylindrical and Rectangular Permeable Membrane Space Sound Absorbers Using the Three-Dimensional Boundary Element Method

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