Proposal of numerical models to predict the diffuse field sound absorption of finite sized porous materials – BEM and FEM approaches

2021 ◽  
Vol 180 ◽  
pp. 108092
Author(s):  
M. Pereira ◽  
P.H. Mareze ◽  
L. Godinho ◽  
P. Amado-Mendes ◽  
J. Ramis
Keyword(s):  
Porous Materials ◽  
Sound Absorption ◽  
Numerical Models ◽  
Field Sound

scholarly journals Diffuse Sound Absorptive Properties of Parallel-Arranged Perforated Plates with Extended Tubes and Porous Materials

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1091 ◽  
Author(s):  
Dengke Li ◽  
Daoqing Chang ◽  
Bilong Liu
Keyword(s):  
Boundary Condition ◽  
Porous Material ◽  
Porous Materials ◽  
Sound Absorption ◽  
Azimuthal Angle ◽  
Octave Band ◽  
Frequency Range ◽  
Absorption Coefficients ◽  
Perforated Plates ◽  
Absorption Performance

The diffuse sound absorption was investigated theoretically and experimentally for a periodically arranged sound absorber composed of perforated plates with extended tubes (PPETs) and porous materials. The calculation formulae related to the boundary condition are derived for the periodic absorbers, and then the equations are solved numerically. The influences of the incidence and azimuthal angle, and the period of absorber arrangement are investigated on the sound absorption. The sound-absorption coefficients are tested in a standard reverberation room for a periodic absorber composed of units of three parallel-arranged PPETs and porous material. The measured 1/3-octave band sound-absorption coefficients agree well with the theoretical prediction. Both theoretical and measured results suggest that the periodic PPET absorbers have good sound-absorption performance in the low- to mid-frequency range in diffuse field.

Sound Absorption Optimization of Porous Materials Using BP Neural Network and Genetic Algorithm

2016 ◽  
Author(s):  
Lianhui Wang ◽  
Shuming Chen ◽  
Dengfeng Wang ◽  
Yang Jiang ◽  
Jing Chen
Keyword(s):  
Neural Network ◽  
Genetic Algorithm ◽  
Porous Materials ◽  
Bp Neural Network ◽  
Sound Absorption

Porous materials for sound absorption

2018 ◽  
Vol 10 ◽  
pp. 25-35 ◽  
Author(s):  
Leitao Cao ◽  
Qiuxia Fu ◽  
Yang Si ◽  
Bin Ding ◽  
Jianyong Yu
Keyword(s):  
Porous Materials ◽  
Sound Absorption

scholarly journals Graded and Anisotropic Porous Materials for Broadband and Angular Maximal Acoustic Absorption

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4605
Author(s):  
Théo Cavalieri ◽  
Jean Boulvert ◽  
Gwénaël Gabard ◽  
Vicent Romero-García ◽  
Marie Escouflaire ◽  
...  
Keyword(s):  
Porous Materials ◽  
Sound Absorption ◽  
Effective Properties ◽  
Numerical Study ◽  
Optimization Technique ◽  
Single Frequency ◽  
Acoustic Absorption ◽  
Graded Material ◽  
Manufacturing Techniques ◽  
Designed Materials

The design of graded and anisotropic materials has been of significant interest, especially for sound absorption purposes. Together with the rise of additive manufacturing techniques, new possibilities are emerging from engineered porous micro-structures. In this work, we present a theoretical and numerical study of graded and anisotropic porous materials, for optimal broadband and angular absorption. Through a parametric study, the effective acoustic and geometric parameters of homogenized anisotropic unit cells constitute a database in which the optimal anisotropic and graded material will be searched for. We develop an optimization technique based on the simplex method that is relying on this database. The concepts of average absorption and diffuse field absorption coefficients are introduced and used to maximize angular acoustic absorption. Numerical results present the optimized absorption of the designed anisotropic and graded porous materials for different acoustic targets. The designed materials have anisotropic and graded effective properties, which enhance its sound absorption capabilities. While the anisotropy largely enhances the diffuse field absorbing when optimized at a single frequency, graded properties appear to be crucial for optimal broadband diffuse field absorption.

On the use of perforations to improve the sound absorption of porous materials

2005 ◽  
Vol 66 (6) ◽  
pp. 625-651 ◽  
Author(s):  
F.C. Sgard ◽  
X. Olny ◽  
N. Atalla ◽  
F. Castel
Keyword(s):  
Porous Materials ◽  
Sound Absorption

scholarly journals Modeling of deformation and fracture of porous media taking into account their morphological composition

2020 ◽  
pp. 175-187
Author(s):  
A. S Shalimov ◽  
M. A Tashkinov
Keyword(s):  
Porous Materials ◽  
Numerical Models ◽  
Aluminum Matrix ◽  
Cell Types ◽  
Plastic Behavior ◽  
Elastic Model ◽  
Open Cell ◽  
Representative Volume ◽  
Closed Cell ◽  
Representative Volume Elements

This paper investigates the mechanical behavior and fracture of porous materials with an aluminum matrix. The purpose of the work was to create numerical models of failure of representative volume elements of such materials and to reveal the dependences of the nature of the failure processes on their structural morphology. Representative volume elements of these materials are random non-uniform structures of closed-cell and open-cell types. To create three-dimensional geometric models of the closed-cell structures, methods of sequential synthesis the possibility of their mutual intersection were used. For creation of models of interpenetrating structures of the open-cell type, methods based on the analytical determination of surfaces separating the two phases are used. In this paper, three approaches to fracture mechanics of representative volume elements of porous materials were studied and implemented. The first approach is an implementation of the elastic model and damage accumulation based on elastic properties degradation in accordance with the criterion of maximum stresses with reduction of the stiffness matrix coefficients in individual elements. The second approach is an implementation of the same model, but with removal of the failed elements. The third approach is based on the Johnson-Cook elastic plastic behavior and fracture model. Numerical modeling of the representative volumes was carried out with finite element analysis using each of the above approaches. The influence of the internal structure of the representative volumes of the porous materials on the processes of deformation and failure was studied on the example of several structures of open-cell and closed-cell types. The influence of stress concentrators on the distribution of stresses in representative volumes and character of their subsequent failure has been studied.

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