期刊
SCIENCE ADVANCES
卷 8, 期 20, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abm4206
关键词
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资金
- RGC grant [A-HKUST601/18, AoE/P-502/20-3, ANR-18-CE08-0021]
- Agence Nationale de la Recherche (ANR) [ANR-18-CE08-0021] Funding Source: Agence Nationale de la Recherche (ANR)
By using a structured tungsten-polyurethane composite, we have designed and experimentally realized an underwater acoustic absorber with high absorption capability in the frequency range of 4 to 20 kHz, measured in a 5.6 m by 3.6 m water pool. The broadband functionality is achieved through optimizing the distribution of Fabry-Perot resonances.
By using a structured tungsten-polyurethane composite that is impedance matched to water while simultaneously having a much slower longitudinal sound speed, we have theoretically designed and experimentally realized an underwater acoustic absorber exhibiting high absorption from 4 to 20 kHz, measured in a 5.6 m by 3.6 m water pool with the time-domain approach. The broadband functionality is achieved by optimally engineering the distribution of the Fabry-Perot resonances, based on an integration scheme, to attain impedance matching over a broad frequency range. The average thickness of the integrated absorber, 8.9 mm, is in the deep subwavelength regime (-lambda/42 at 4 kHz) and close to the causal minimum thickness of 8.2 mm that is evaluated from the simulated absorption spectrum. The structured composite represents a new type of acoustic metamaterials that has high acoustic energy density and promises broad underwater applications.
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