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- W2622835533 abstract "Omnidirectional sound barriers are useful for various applications in noise reduction. Conventional sound insulating structures like micro-perforated plates or porous materials prevent the exchange of airflow. Here, we propose the design of an acoustic metacage which can shield acoustic waves from all directions and have the ability of allowing air pass through freely. The mechanism is that the strong parallel momentum along the surface rejects sound regardless of the directions of the incident wave. Structures based on open channels and Helmholtz resonators are designed at an operation frequency of 2.49 kHz with thickness less than half of the wavelength. A prototype is fabricated using 3D printing and further verified experimentally in a waveguide. Simulation and measurement results clearly show that the proposed metacage can shield acoustic waves when the sources are placed either interior or exterior. An average energy decay of more than 10 dB is achieved when a loudspeaker is placed inside the metacage within a certain frequency band. Our metacage can have applications where ventilation is required." @default.
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- W2622835533 date "2017-05-01" @default.
- W2622835533 modified "2023-10-16" @default.
- W2622835533 title "Omnidirectional sound shielding with acoustic metacages" @default.
- W2622835533 doi "https://doi.org/10.1121/1.4987599" @default.
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