THEORETICAL CONTRIBUTIONS TO PHONOABSORBANT STRUCTURE WITH FUNCTIONALITY IN THE LOWER FREQUENCIES FIELD
This work proposes theoretical quantification of an aqueous solution of the noise attenuation encountered in road traffic. Theory of operation of these acoustic absorbers is based on the principle of Helmholtz resonator which in this case consists of a perforated panel mounted over four types of cavities with the profile sections identical but with different lengths, arranged in parallel. Due to the arrangement on the same plan, Helmholtz resonators, forms an overall operational with four frequencies (resonance) influenced by the lengths of the four types of cavities behind kink perforated panel with uniform over its entire surface area.
Keywords: acoustic absorbers, structure, lower frequencies field
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