Acoustic metamaterials for sound mitigation
Acoustic Metamaterials for Sound Mitigation Métamatériaux Acoustiques pour l'Isolation Sonique
Résumé
We provide theoretical and numerical analyses of a plate-type acoustic metamaterial behavior considered in an air-borne sound environment in view of sound mitigation application. Two configurations of plate are studied, a spring-mass and a pillar system-based. Acoustic performances of the considered systems are investigated with different approaches and show that a high sound transmission loss (STL) up to 82dB is reached with a metamaterial plate of 0.5mm thickness.
Physical understanding of the acoustic behavior of the metamaterial partition is discussed based on both air-borne and structure-borne approaches. Confrontation between the STL, the band structure, the displacement fields and the effective masse density of the plate metamaterial is made to have a complete physical understanding of the different involved mechanisms.
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