Journal
JOURNAL OF APPLIED PHYSICS
Volume 123, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5009441
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Funding
- Multidisciplinary University Research Initiative grant from the Office of Naval Research [N00014-13-1-0631]
- Emerging Frontiers in Research and Innovation grant from the National Science Foundation [1641084]
- Emerging Frontiers & Multidisciplinary Activities
- Directorate For Engineering [1641084] Funding Source: National Science Foundation
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Conventional sound shielding structures typically prevent fluid transport between the exterior and interior. A design of a two-dimensional acoustic metacage with subwavelength thickness which can shield acoustic waves from all directions while allowing steady fluid flow is presented in this paper. The structure is designed based on acoustic gradient-index metasurfaces composed of open channels and shunted Helmholtz resonators. In-plane sound at an arbitrary angle of incidence is reflected due to the strong parallel momentum on the metacage surface, which leads to low sound transmission through the metacage. The performance of the proposed metacage is verified by numerical simulations and measurements on a three-dimensional printed prototype. The acoustic metacage has potential applications in sound insulation where steady fluid flow is necessary or advantageous. Published by AIP Publishing.
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