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Decay processes in rooms with non-diffuse sound fields Part II: Effect of irregularities

Nilsson, Erling LU (2004) In Building Acoustics 11(2). p.113-143
Abstract
The effect of sound scattering objects in a rectangular room with high absorption at the ceiling and low absorption at the walls and floor was investigated. In Part I of this paper a two-system Statistical Energy Analysis (SEA) model was developed in order to predict the gross features of the decay process. The sound field is subdivided into a grazing and nongrazing part. The main effect of introducing irregularities is to divert some of the energy in the grazing group into the nongrazing group. The energy transfer between the groups is taken into account by introducing a coupling loss factor. In order to quantify the effect of scattering objects and other irregularities, a measure called equivalent scattering area is introduced. The model... (More)
The effect of sound scattering objects in a rectangular room with high absorption at the ceiling and low absorption at the walls and floor was investigated. In Part I of this paper a two-system Statistical Energy Analysis (SEA) model was developed in order to predict the gross features of the decay process. The sound field is subdivided into a grazing and nongrazing part. The main effect of introducing irregularities is to divert some of the energy in the grazing group into the nongrazing group. The energy transfer between the groups is taken into account by introducing a coupling loss factor. In order to quantify the effect of scattering objects and other irregularities, a measure called equivalent scattering area is introduced. The model demonstrates how the equivalent scattering area can be determined from measurements. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Building Acoustics
volume
11
issue
2
pages
113 - 143
publisher
Multi-Science Publishing
external identifiers
  • scopus:84864718255
DOI
10.1260/1351010041494773
language
English
LU publication?
yes
id
08ae2fea-46e7-4996-aeaa-4176bcd6a3b8 (old id 929870)
date added to LUP
2008-01-27 09:23:06
date last changed
2017-01-15 04:37:09
@article{08ae2fea-46e7-4996-aeaa-4176bcd6a3b8,
  abstract     = {The effect of sound scattering objects in a rectangular room with high absorption at the ceiling and low absorption at the walls and floor was investigated. In Part I of this paper a two-system Statistical Energy Analysis (SEA) model was developed in order to predict the gross features of the decay process. The sound field is subdivided into a grazing and nongrazing part. The main effect of introducing irregularities is to divert some of the energy in the grazing group into the nongrazing group. The energy transfer between the groups is taken into account by introducing a coupling loss factor. In order to quantify the effect of scattering objects and other irregularities, a measure called equivalent scattering area is introduced. The model demonstrates how the equivalent scattering area can be determined from measurements.},
  author       = {Nilsson, Erling},
  language     = {eng},
  number       = {2},
  pages        = {113--143},
  publisher    = {Multi-Science Publishing},
  series       = {Building Acoustics},
  title        = {Decay processes in rooms with non-diffuse sound fields Part II: Effect of irregularities},
  url          = {http://dx.doi.org/10.1260/1351010041494773},
  volume       = {11},
  year         = {2004},
}