scholarly journals Sound absorption of parallel arrangement of multiple micro-perforated panel absorbers at oblique incidence

2014 ◽  
Vol 135 (4) ◽  
pp. 2380-2380
Author(s):  
Chunqi Wang ◽  
Lixi Huang ◽  
Yumin Zhang
Keyword(s):  
Sound Absorption ◽  
Oblique Incidence ◽  
Parallel Arrangement

Investigation of a Compound Perforated Panel Absorber With Backing Cavities Partially Filled With Polymer Materials

2015 ◽  
Vol 137 (4) ◽  
Author(s):  
C. Q. Wang ◽  
Y. S. Choy
Keyword(s):  
Sound Absorption ◽  
Normal Incidence ◽  
Polyester Fiber ◽  
Polymer Materials ◽  
Element Simulation ◽  
Parallel Arrangement ◽  
Cavity Configuration ◽  
Absorption Performance ◽  
Good Agreement ◽  
Panel Absorber

The paper concerns the sound absorption performance of a compound absorber which consists of a parallel arrangement of multiple perforated panel absorbers of different backing cavity depths partially filled with poroelastic polymer materials. Three polymer materials are considered: expandable polystyrene (EPS) foam, polymethacrylimide (PMI) foam, and polyester fiber. The normal incidence sound absorption coefficients of the compound panel absorber are tested experimentally. Results show that the former two foams can achieve similar absorption performance to the rigid cavity configuration, while the resonances shift to lower frequencies due to the changes of effective cavity depths. It is also found that the additional attenuation by polymer foams may improve sound absorption, but the effect is marginal. For polyester fiber, results show that it performs more like a single perforated panel absorber. Finite element simulation of the compound panel absorber is also discussed, and good agreement is observed between simulated and experimental results.

Acoustic performance prediction of anechoic layer using identified viscoelastic parameters

2018 ◽  
Vol 25 (6) ◽  
pp. 1164-1178 ◽  
Author(s):  
Meng Tao ◽  
Hanfeng Ye ◽  
Xuefeng Zhao
Keyword(s):  
Performance Prediction ◽  
Sound Absorption ◽  
Oblique Incidence ◽  
Cylindrical Tube ◽  
The Other ◽  
Reflection Coefficients ◽  
Dynamic Parameters ◽  
Acoustic Performance ◽  
Viscoelastic Parameters ◽  
Cylindrical Holes

In this work, the acoustic performance of an anechoic layer, which contains horizontally-distributed cylindrical holes, has been studied using identified viscoelastic dynamic parameters. First, the reflection coefficients of two different viscoelastic anechoic layers (one solid and the other perforated), tested in a water-filled pipe, have been used to develop the identification method for viscoelastic dynamic parameters. In the proposed method, the complex longitudinal wavenumber and the complex transverse wavenumber can be obtained by solving the characteristic equation of viscoelastic cylindrical tube. Then, simulations have been performed using COMSOL software to predict the acoustic performance of the anechoic layer. Based on the model and the identified viscoelastic parameters, the effects of different structural properties, including the radius of hole, the hole horizontal spacing, and the arrangements of holes, on the sound absorption of anechoic layer have been analyzed and discussed. Particularly, the acoustic performance of an anechoic layer under oblique incidence has also been considered.

scholarly journals Additional Sound Absorption Within a Poroelastic Lamella Network Under Oblique Incidence

2018 ◽  
Vol 104 (2) ◽  
pp. 211-219 ◽  
Author(s):  
Nicolas Dauchez ◽  
Benoit Nennig ◽  
Olivier Robin
Keyword(s):  
Sound Absorption ◽  
Oblique Incidence

scholarly journals In situ measurements of the oblique incidence sound absorption coefficient for finite sized absorbers

2016 ◽  
Vol 139 (1) ◽  
pp. 41-52 ◽  
Author(s):  
Marco Ottink ◽  
Jonas Brunskog ◽  
Cheol-Ho Jeong ◽  
Efren Fernandez-Grande ◽  
Per Trojgaard ◽  
...  
Keyword(s):  
Absorption Coefficient ◽  
Sound Absorption ◽  
Oblique Incidence ◽  
In Situ Measurements ◽  
Sound Absorption Coefficient

Low-frequency sound absorption of elastic micro-perforated plates in a parallel arrangement

2019 ◽  
Vol 460 ◽  
pp. 114884 ◽  
Author(s):  
Hyun-Sil Kim ◽  
Pyung-Sik Ma ◽  
Bong-Ki Kim ◽  
Sang-Ryul Kim ◽  
Seong-Hyun Lee
Keyword(s):  
Sound Absorption ◽  
Low Frequency ◽  
Perforated Plates ◽  
Frequency Sound ◽  
Parallel Arrangement
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