期刊
APPLIED PHYSICS LETTERS
卷 113, 期 20, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.5063504
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-
资金
- Agence Nationale de la Recherche international project FlowMatAc [ANR-15-CE22-0016-01]
A concept of an ultra-thin low frequency perfect sound absorber is proposed and demonstrated experimentally. To minimize non-linear effects, a high ratio of the active area to the total area is used to avoid large localized amplitudes. The absorber consists of three elements: a mass supported by a very flexible membrane, a cavity, and a resistive layer. The resonance frequency of the sound absorber can be easily adjusted just by changing the mass or thickness of the cavity. A very large ratio between the wavelength and the material thickness is measured for a manufactured perfect absorber (ratio = 201). It is shown that this high sub-wavelength ratio is associated with narrowband effects and that the increase in the sub-wavelength ratio is limited by the damping in the system. Published by AIP Publishing.
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