An Inverse Method to Obtain Porosity, Fibre Diameter and Density of Fibrous Sound Absorbing Materials
Characterization of sound absorbing materials is essential to predict its acoustic behaviour. The most commonly used models to do so consider the flow resistiv- ity, porosity, and average fibre diameter as parameters to determine the acoustic impedance and sound absorbing coefficient. Besides dir...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Institute of Fundamental Technological Research Polish Academy of Sciences
2013-10-01
|
| Series: | Archives of Acoustics |
| Subjects: | |
| Online Access: | https://acoustics.ippt.pan.pl/index.php/aa/article/view/165 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Characterization of sound absorbing materials is essential to predict its acoustic
behaviour. The most commonly used models to do so consider the flow resistiv-
ity, porosity, and average fibre diameter as parameters to determine the acoustic
impedance and sound absorbing coefficient. Besides direct experimental techniques,
numerical approaches appear to be an alternative to estimate the material’s pa-
rameters. In this work an inverse numerical method to obtain some parameters of
a fibrous material is presented. Using measurements of the normal incidence sound
absorption coefficient and then using the model proposed by Voronina, subsequent
application of basic minimization techniques allows one to obtain the porosity, aver-
age fibre diameter and density of a sound absorbing material. The numerical results
agree fairly well with the experimental data. |
|---|---|
| ISSN: | 0137-5075 2300-262X |