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Decay processes in rooms with non-diffuse sound fields Part I: Ceiling treatment with absorbing material

Nilsson, Erling LU (2004) In Building Acoustics 11(1). p.39-60
Abstract
The decay process in rooms with non-diffuse sound fields was the subject of this investigation. A rectangular room with high absorption at the ceiling and low absorption at the walls and floor constituted the basic configuration for the study. Several alterations of the room were carried out, including changes of room dimensions and the type of ceiling absorber, also additional treatment with absorbent material. The effects of these alterations on the decay curves were analysed. In order to predict the gross features of the decay curves, a two-system Statistical Energy Analysis model was developed. The sound field was subdivided into a grazing and nongrazing part. The grazing part comprised modes with propagation direction almost parallel... (More)
The decay process in rooms with non-diffuse sound fields was the subject of this investigation. A rectangular room with high absorption at the ceiling and low absorption at the walls and floor constituted the basic configuration for the study. Several alterations of the room were carried out, including changes of room dimensions and the type of ceiling absorber, also additional treatment with absorbent material. The effects of these alterations on the decay curves were analysed. In order to predict the gross features of the decay curves, a two-system Statistical Energy Analysis model was developed. The sound field was subdivided into a grazing and nongrazing part. The grazing part comprised modes with propagation direction almost parallel to the 'principal' surface (generally the absorbent ceiling). The nongrazing part comprised the oblique modes, of importance for the decay process. The angle dependent absorbent properties of the principal surface were taken into account when subdividing the sound field into a grazing and nongrazing part. Measured and calculated decay curves for different room configurations were compared. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Building Acoustics
volume
11
issue
1
pages
39 - 60
publisher
Multi-Science Publishing
external identifiers
  • Scopus:33750323000
language
English
LU publication?
yes
id
8be8b096-1727-4890-98be-77dae17a7c47 (old id 929872)
alternative location
http://www.ingentaconnect.com/
date added to LUP
2008-01-27 09:39:45
date last changed
2016-11-27 04:35:42
@misc{8be8b096-1727-4890-98be-77dae17a7c47,
  abstract     = {The decay process in rooms with non-diffuse sound fields was the subject of this investigation. A rectangular room with high absorption at the ceiling and low absorption at the walls and floor constituted the basic configuration for the study. Several alterations of the room were carried out, including changes of room dimensions and the type of ceiling absorber, also additional treatment with absorbent material. The effects of these alterations on the decay curves were analysed. In order to predict the gross features of the decay curves, a two-system Statistical Energy Analysis model was developed. The sound field was subdivided into a grazing and nongrazing part. The grazing part comprised modes with propagation direction almost parallel to the 'principal' surface (generally the absorbent ceiling). The nongrazing part comprised the oblique modes, of importance for the decay process. The angle dependent absorbent properties of the principal surface were taken into account when subdividing the sound field into a grazing and nongrazing part. Measured and calculated decay curves for different room configurations were compared.},
  author       = {Nilsson, Erling},
  language     = {eng},
  number       = {1},
  pages        = {39--60},
  publisher    = {ARRAY(0xb7c7788)},
  series       = {Building Acoustics},
  title        = {Decay processes in rooms with non-diffuse sound fields Part I: Ceiling treatment with absorbing material},
  volume       = {11},
  year         = {2004},
}