Journal
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
Volume 142, Issue 4, Pages 2288-2297Publisher
ACOUSTICAL SOC AMER AMER INST PHYSICS
DOI: 10.1121/1.5007851
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Funding
- European Union through ITN-project FlowAirS [FP7-PEOPLE-2011-ITN-289352]
- French Research National Agency
- Research Foundation for Aeronautics and Space through the project Metaudible [ANR-13-BS09-0003-01]
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A metamaterial composed of a set of periodic rigid resonant inclusions embedded in a porous lining is investigated to enhance the sound attenuation in an acoustic duct at low frequencies. A transmission loss peak is observed on the measurements and corresponds to the crossing of the lower two Bloch modes of an infinite periodic material. Numerical parametric studies show that the optimum modal attenuation can be achieved at the exceptional point in the parameter plane of inclusion position and frequency, where the two lower modes merge. (C) 2017 Acoustical Society of America.
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