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Analysis of sound transmission loss of double-leaf walls in the low-frequency range using the finite element method

Davidsson, Peter LU ; Brunskog, Jonas LU ; Wernberg, Per-Anders LU ; Sandberg, Göran LU and Hammer, Per LU (2004) In Building Acoustics 11(4). p.239-257
Abstract
The sound transmission loss of double walls in the low-frequency range is studied by means of structure-acoustic finite element analysis. The analysis simulates standard experiments to determine sound transmission loss of walls. The model is a detailed description of the geometry of the system, including both the double wall and the rooms acoustically coupled to the wall. The frequency range studied is in the 1/3-octave bands between 40 Hz and 200 Hz. A parametric study is performed to investigate the influence on the sound transmission loss of various material and geometric properties of the wall and the dimensions of the connecting rooms. The model confirms the importance of primary structural resonance and the size of the connecting... (More)
The sound transmission loss of double walls in the low-frequency range is studied by means of structure-acoustic finite element analysis. The analysis simulates standard experiments to determine sound transmission loss of walls. The model is a detailed description of the geometry of the system, including both the double wall and the rooms acoustically coupled to the wall. The frequency range studied is in the 1/3-octave bands between 40 Hz and 200 Hz. A parametric study is performed to investigate the influence on the sound transmission loss of various material and geometric properties of the wall and the dimensions of the connecting rooms. The model confirms the importance of primary structural resonance and the size of the connecting rooms in determining the degree of sound transmission loss. The primary structural resonance is mainly determined by the distance between the wall studs and the properties of the sheeting material. Wall length is also important; if the length is such that the wall studs of the last wall cavity are closer together than those of the other wall cavities, the primary structural resonance will be at a higher frequency, thereby decreasing sound transmission loss over a broader frequency range. Similar dimensions of the connecting rooms results in poor transmission loss, mainly at frequencies below 100 Hz (for the wall and room dimensions studied here). (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Building Acoustics
volume
11
issue
4
pages
239 - 257
publisher
Multi-Science Publishing
external identifiers
  • Scopus:56249102720
DOI
10.1260/1351010042900077
language
English
LU publication?
yes
id
489a9536-6927-4ffe-94c7-5d0537532ac5 (old id 929864)
date added to LUP
2008-01-26 09:54:04
date last changed
2016-10-30 04:42:47
@misc{489a9536-6927-4ffe-94c7-5d0537532ac5,
  abstract     = {The sound transmission loss of double walls in the low-frequency range is studied by means of structure-acoustic finite element analysis. The analysis simulates standard experiments to determine sound transmission loss of walls. The model is a detailed description of the geometry of the system, including both the double wall and the rooms acoustically coupled to the wall. The frequency range studied is in the 1/3-octave bands between 40 Hz and 200 Hz. A parametric study is performed to investigate the influence on the sound transmission loss of various material and geometric properties of the wall and the dimensions of the connecting rooms. The model confirms the importance of primary structural resonance and the size of the connecting rooms in determining the degree of sound transmission loss. The primary structural resonance is mainly determined by the distance between the wall studs and the properties of the sheeting material. Wall length is also important; if the length is such that the wall studs of the last wall cavity are closer together than those of the other wall cavities, the primary structural resonance will be at a higher frequency, thereby decreasing sound transmission loss over a broader frequency range. Similar dimensions of the connecting rooms results in poor transmission loss, mainly at frequencies below 100 Hz (for the wall and room dimensions studied here).},
  author       = {Davidsson, Peter and Brunskog, Jonas and Wernberg, Per-Anders and Sandberg, Göran and Hammer, Per},
  language     = {eng},
  number       = {4},
  pages        = {239--257},
  publisher    = {ARRAY(0x567c9a0)},
  series       = {Building Acoustics},
  title        = {Analysis of sound transmission loss of double-leaf walls in the low-frequency range using the finite element method},
  url          = {http://dx.doi.org/10.1260/1351010042900077},
  volume       = {11},
  year         = {2004},
}