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EUROPEAN SYMPOSIUM ON UNDERWATER ACOUSTICS APPLICATIONS EUROPEAN SYMPOSIUM ON SUSTAINABLE BUILDING ACOUSTICS

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Figure 1: Configuration of the model of the 3D periodic structure: a) view of a small part of the structure; b) vertical cross section of the unitary perforated resonator with absorbing material in the air gap
Figure 2: Sound Pressure Levels (SPL, in dB) computed with the periodic BEM formulation in a vertical plane (y=1.05m), for two different exciting frequencies: a) 571.7Hz; b) 750Hz
Figure 4: Sound absorption (on the left) and Insertion Loss (dB) (on the right) curves for different acoustic surfaces of the unitary resonator: a), b) varying perforation rate and perforation diameter; c), d) varying thickness of the absorbent material in

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