Resumé
| Originalsprog | Engelsk |
|---|---|
| Artikelnummer | 163508 |
| Tidsskrift | Journal of Applied Physics |
| Vol/bind | 116 |
| Udgave nummer | 16 |
| Antal sider | 6 |
| ISSN | 0021-8979 |
| DOI | |
| Status | Udgivet - 2014 |
| Udgivet eksternt | Ja |
Fingeraftryk
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Modelling the acoustical response of lossy lamella-crystals. / Christensen, Johan; Mortensen, N. Asger; Willatzen, Morten.
I: Journal of Applied Physics, Bind 116, Nr. 16, 163508, 2014.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review
TY - JOUR
T1 - Modelling the acoustical response of lossy lamella-crystals.
AU - Christensen, Johan
AU - Mortensen, N. Asger
AU - Willatzen, Morten
PY - 2014
Y1 - 2014
N2 - The sound propagation properties of lossy lamella-crystals are analysed theoretically utilizing a rig- orous wave expansion formalism and an effective medium approach. We investigate both sup- ported and free-standing crystal slab structures and predict high absorption for a broad range of frequencies. A detailed derivation of the formalism is presented, and we show how the results obtained in the subwavelength and superwavelength regimes qualitatively can be reproduced by homogenizing the lamella-crystals. We come to the conclusion that treating this structure within the metamaterial limit only makes sense if the crystal filling fraction is sufficiently large to satisfy an effective medium approach.
AB - The sound propagation properties of lossy lamella-crystals are analysed theoretically utilizing a rig- orous wave expansion formalism and an effective medium approach. We investigate both sup- ported and free-standing crystal slab structures and predict high absorption for a broad range of frequencies. A detailed derivation of the formalism is presented, and we show how the results obtained in the subwavelength and superwavelength regimes qualitatively can be reproduced by homogenizing the lamella-crystals. We come to the conclusion that treating this structure within the metamaterial limit only makes sense if the crystal filling fraction is sufficiently large to satisfy an effective medium approach.
U2 - 10.1063/1.4898808
DO - 10.1063/1.4898808
M3 - Journal article
VL - 116
JO - Journal of Applied Physics
JF - Journal of Applied Physics
SN - 0021-8979
IS - 16
M1 - 163508
ER -