We have designed a cylindrical perfect absorber based on acoustic metamaterials. The absorber consists of a metamaterial shell that surrounds a center that dissipates the acoustic energy. The metamaterial shell is designed so that perfectly matches the acoustic impedance of the air background and guides the sound to the center. Numerical simulations are reported about the efficiency of the absorber as a function of the absorbing material employed at the center.

Volume Subject Area:
Vibration, Acoustics and Wave Propagation
Topics:
Noise control, Phononic crystals, Acoustics, Metamaterials, Shells, Computer simulation
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