Absorption and radiation impedance of finite absorbing patches
(2003) In Acta Acustica united with Acustica 89(3). p.406415 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 setup. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/record/308770
 author
 Holmberg, Dag ^{LU} ; Hammer, Per ^{LU} and Nilsson, Erling ^{LU}
 organization
 publishing date
 2003
 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
 14367947
 language
 English
 LU publication?
 yes
 id
 9e62b8e880214511b73313cc99726037 (old id 308770)
 date added to LUP
 20070803 09:44:05
 date last changed
 20180107 09:33:33
@article{9e62b8e880214511b73313cc99726037, 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 setup.}, author = {Holmberg, Dag and Hammer, Per and Nilsson, Erling}, issn = {14367947}, language = {eng}, number = {3}, pages = {406415}, publisher = {Hirzel Verlag}, series = {Acta Acustica united with Acustica}, title = {Absorption and radiation impedance of finite absorbing patches}, volume = {89}, year = {2003}, }