Acoustic metamaterials for sound mitigation |
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Institution: | 1. CNRS, Institut Jean-Lamour, 54506 Vand?uvre-lès-Nancy, France;2. University of Lorraine, Institut Jean-Lamour, bd des Aiguillettes, BP 70239, 54506 Vand?uvre-lès-Nancy, France;3. Key Laboratory of Dynamics and Control of Flight Vehicle, Ministry of Education and School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China |
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Abstract: | We provide theoretical and numerical analyses of the behavior of a plate-type acoustic metamaterial considered in an air-borne sound environment in view of sound mitigation application. Two configurations of plate are studied, a spring-mass one and a pillar system-based one. The acoustic performances of the considered systems are investigated with different approaches and show that a high sound transmission loss (STL) up to 82 dB is reached with a metamaterial plate with a thickness of 0.5 mm. The 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 mass density of the plate metamaterial is made to have a complete physical understanding of the different mechanisms involved. |
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Keywords: | Acoustic metamaterials Phononics Acoustic propagation Sound mitigation |
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