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

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 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

scholarly journals Measuring oblique incidence sound absorption using a local plane wave assumption

2014 ◽  
Vol 100 (2) ◽  
pp. 205-214
Author(s):  
E. R. Kuipers ◽  
Y. H. Wijnant ◽  
A. de Boer
Keyword(s):  
Plane Wave ◽  
Sound Absorption ◽  
Oblique Incidence ◽  
Local Plane
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