Advanced

Absorption and radiation impedance of finite absorbing patches

Holmberg, Dag LU ; Hammer, Per LU and Nilsson, Erling LU (2003) In Acta Acustica united with Acustica 89(3). p.406-415
Abstract
A variational formulation is used to calculate the sound absorption in order to incorporate the interaction between several absorbing patches of arbitrary shape. In particular, this formulation is applied to small periodic patches. The absorption characteristics are governed by the radiation impedance, Z(r), which is a function of the absorber's geometry and the incidence angle, together with the surface impedance of the absorber. The behaviour of Z(r) is evaluated numerically for a number of typical configurations, and the effect on the statistical absorption coefficient, alpha(stat) is calculated. The evaluations stress that alpha(stat) is regulated by the interaction between Z(r) and the impedance of the absorber. A comparison is made... (More)
A variational formulation is used to calculate the sound absorption in order to incorporate the interaction between several absorbing patches of arbitrary shape. In particular, this formulation is applied to small periodic patches. The absorption characteristics are governed by the radiation impedance, Z(r), which is a function of the absorber's geometry and the incidence angle, together with the surface impedance of the absorber. The behaviour of Z(r) is evaluated numerically for a number of typical configurations, and the effect on the statistical absorption coefficient, alpha(stat) is calculated. The evaluations stress that alpha(stat) is regulated by the interaction between Z(r) and the impedance of the absorber. A comparison is made of results from measurements and calculations performed on the measurement set-up. (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
Acta Acustica united with Acustica
volume
89
issue
3
pages
406 - 415
publisher
Hirzel Verlag
external identifiers
  • wos:000183655900003
  • scopus:0038204656
ISSN
1436-7947
language
English
LU publication?
yes
id
9e62b8e8-8021-4511-b733-13cc99726037 (old id 308770)
date added to LUP
2007-08-03 09:44:05
date last changed
2018-10-03 11:43:04
@article{9e62b8e8-8021-4511-b733-13cc99726037,
  abstract     = {A variational formulation is used to calculate the sound absorption in order to incorporate the interaction between several absorbing patches of arbitrary shape. In particular, this formulation is applied to small periodic patches. The absorption characteristics are governed by the radiation impedance, Z(r), which is a function of the absorber's geometry and the incidence angle, together with the surface impedance of the absorber. The behaviour of Z(r) is evaluated numerically for a number of typical configurations, and the effect on the statistical absorption coefficient, alpha(stat) is calculated. The evaluations stress that alpha(stat) is regulated by the interaction between Z(r) and the impedance of the absorber. A comparison is made of results from measurements and calculations performed on the measurement set-up.},
  author       = {Holmberg, Dag and Hammer, Per and Nilsson, Erling},
  issn         = {1436-7947},
  language     = {eng},
  number       = {3},
  pages        = {406--415},
  publisher    = {Hirzel Verlag},
  series       = {Acta Acustica united with Acustica},
  title        = {Absorption and radiation impedance of finite absorbing patches},
  volume       = {89},
  year         = {2003},
}