This paper reports the results of normal incidence sound absorption measurements done over three different acoustic materials with varying thickness. A microperforated panel (MPP) was added to cover the absorber, in some cases leaving an air cavity between them. The measurements were done in an impedance tube, according to ISO 10534-2:1998. The aim was to find the best setup of the test samples to build a device that improves the absorption especially at low frequency. It is concluded that having the acoustic materials in contact with the MPP and backed by an air layer gives the expected results.
Sound absorption of multilayered samples composed by different porous materials and perforated facing / Lumei C.V.; Arghir M.; Garai M.. - In: ANNALS OF DAAAM FOR ... & PROCEEDINGS OF THE ... INTERNATIONAL DAAAM SYMPOSIUM .... - ISSN 1726-9679. - STAMPA. - 22:1(2011), pp. 613.1257-613.1258. (Intervento presentato al convegno Annals of DAAAM for 2011 and 22nd International DAAAM Symposium "Intelligent Manufacturing and Automation: Power of Knowledge and Creativity" tenutosi a Vienna, aut nel 2011).
Sound absorption of multilayered samples composed by different porous materials and perforated facing
Garai M.
2011
Abstract
This paper reports the results of normal incidence sound absorption measurements done over three different acoustic materials with varying thickness. A microperforated panel (MPP) was added to cover the absorber, in some cases leaving an air cavity between them. The measurements were done in an impedance tube, according to ISO 10534-2:1998. The aim was to find the best setup of the test samples to build a device that improves the absorption especially at low frequency. It is concluded that having the acoustic materials in contact with the MPP and backed by an air layer gives the expected results.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
