- Tytuł:
- Experimental tests of the acoustic properties of sound-absorbing linings and cores of layered baffles
- Autorzy:
- Kosała, Krzysztof
- Powiązania:
- https://bibliotekanauki.pl/articles/2146647.pdf
- Data publikacji:
- 2021
- Wydawca:
- Politechnika Poznańska. Instytut Mechaniki Stosowanej
- Tematy:
-
sound transmission loss
sound absorption coefficient
insertion loss
baffles
mineral wool
izolacyjność akustyczna od dźwięków powietrznych
współczynnik pochłaniania dźwięku
tłumienie przepustowe
przegrody
wełna mineralna - Opis:
- The article presents the results of research on the acoustic properties of materials used as sound-absorbing linings and cores in baffles of anti-noise protection. Using an impedance tube the spectral characteristics of the normal incidence sound absorption and sound transmission loss indices of 12 specimens of mineral wool with different density and thickness were determined. From these characteristics, the single-number weighted sound absorption coefficient αw and the sound reduction index Rw were calculated. To calculate the value of the Rw index on the basis of surface mass of the mineral wool specimen, a new formula was proposed. The insertion loss of an acoustic enclosure with one, two and three-layer walls with dimensions of 0.7×0.7 m, containing mineral wool, was determined. The best efficiency was achieved for the enclosure made of walls of layers: mineral wool, placed on the sound source side, steel plate and aluminium plate.
- Źródło:
-
Vibrations in Physical Systems; 2021, 32, 1; art. no. 2021107
0860-6897 - Pojawia się w:
- Vibrations in Physical Systems
- Dostawca treści:
- Biblioteka Nauki
Artykuł