Increasing the Frequency Band of Sound Absorption for Flat Multi-Layered Absorbers Consisting of Porous Material, Perforated Panel and Air-Gap
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
Sound pollution, especially in metropolises, is a critical issue at the time being. Hence, appropriate sound absorbers which absorb higher noise in a wide range of frequencies are desirable especially when less occupied space is needed. In the present study, four primary models are proposed by combination of the porous material, micro-perforated panels and air gap. Afterwards, sound absorption coefficient was maximized in every proposed model by employing both analytical approach (transfer matrix method) and finite element method (by COMSOL Multi-physics version 4.4). Verification has been carried out by comparison with the theoretical and experimental results of previous studies. The results showed well agreement between present and previous results. Consequently, an optimized model by maximum sound absorption coefficient was proposed. The proposed model showed the average of sound absorption coefficient equal to 0.9 which is approximately 5% more than previous studies in the frequency range of 1 to 6000 Hz for 51 mm thickness of panel. In other words, the presented structure, with a less thickness has the same sound absorption coefficient of the commercial industrial structures. This is very important in terms of engineering because the presented sound absorber takes up less space and also, running costs are reduced.
Language:
Persian
Published:
Amirkabir Journal Mechanical Engineering, Volume:50 Issue: 1, 2018
Pages:
219 to 230
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