| Autor: |
Qu, Sichao, Gao, Nan, Tinel, Alain, Morvan, Bruno, Romero-García, Vicente, Groby, Jean-Philippe, Sheng, Ping |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Science Advances 8(20), eabm4206, 2022 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1126/sciadv.abm4206 |
| Popis: |
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 5.6m times 3.6m 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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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