In recent years, the importance of noise control has dramatically increased due to noise pollution. In this study, in order to improve the acoustic performance of pure aluminum foam, 3wt% carbon nanotube (CNT) and 3wt% graphene nanoplate (GNP) were added to the pure aluminum foam, foams were made with 60% porosity by 500 microns in diameter size. Then the transmission loss in Al-3wt%CNT and Al-3wt%GNP foams were compared to that of pure aluminum foam. The paper is focused on the sound transmission loss (STL) of the pure aluminum, Al-3wt%CNT and Al-3wt%GNP foams. The results showed that the addition of 3wt%CNT and 3wt%GNP respectively had about 20 and 7 dB in sound transmission loss in comparison to the pure aluminum foam. A better performance of nanotubes in comparison to nanoplates is due to the occurrence of Thermoacoustic phenomenon in the nanotubes and as a result of conversion of acoustic energy into heat energy.
Type of Study:
Research |
Subject:
Sonophysics Received: 2021/07/21 | Accepted: 2021/09/22 | Published: 2021/09/22