Naslov
Comparison of acoustic resistance of a perforated plate absorber with a tightly and loosely placed thin porous layer

Autori
Vican, Ivan ; Jambrošić, Kristian ; Horvat, Marko

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the 6th Congress of Alps-Adria Acoustics Association / Graf, Franz - Graz : Austrian Acoustics Association, 2014, 1-7

ISBN
978-3-200-03921-6

Skup
6th Congress of Alps-Adria Acoustics Association

Mjesto i datum
Graz, Austrija, 16.10.2014. - 17.10.2014

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
perforated plate absorber; acoustic impedance; resonant absorber

Sažetak
In this paper, the comparison of acoustic resistance of a perforated plate absorber for two characteristic cases is shown: one with a thin porous layer glued tightly to the backing of the perforated plate, and the other with a thin porous layer placed near the perforations, without tight contact. The measurements were done in the Kundt's tube, by using eight setups: four plates with different porosities (4.4%, 8.5%, 12.9% and 16.9%) and a 2 mm thick porous layer with two different air layer depths. The porous layer can simply be added to the acoustic resistance in the case of its tight placement to the perforated plate. On the other hand, absorber resistance is much less increased when a loosely placed porous layer is introduced to the perforations, but still shows a positive correlation with the resistance increase in the case of tight placement. Measured acoustic resistances are shown for two characteristic cases, including their numerical ratios between tight and loose contact. These ratios are introduced as an improvement to the analytical expression used for calculating the acoustic impedance, as well as an addition to the methods of tuning the acoustic resistance in complex absorber setups.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

POVEZANOST RADA