Low frequency sound attenuation in a flow duct using a thin slow sound material
2016 (English)In: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 139, no 5, EL149-EL153 p.Article in journal (Refereed) Published
A thin subwavelength material that can be flush mounted in a duct and that gives an attenuation band at low frequencies in air flow channels is presented. To decrease the material thickness, the sound is slowed in the material using folded side branch tubes. The impedance of the material is compared to the optimal value given by the Cremer condition, which can differ greatly from the air characteristic impedance. Grazing flow on this material increases the losses at the interface between the flow and the material.
Place, publisher, year, edition, pages
Acoustical Society of America (ASA), 2016. Vol. 139, no 5, EL149-EL153 p.
IdentifiersURN: urn:nbn:se:kth:diva-192864DOI: 10.1121/1.4951028ISI: 000377715100007ScopusID: 2-s2.0-84971320440OAI: oai:DiVA.org:kth-192864DiVA: diva2:972575
FunderEU, FP7, Seventh Framework Programme, 289352
QC 201609222016-09-212016-09-212016-09-23Bibliographically approved