水下
材料科学
声学
超材料
宽带
声阻抗
阻抗匹配
电阻抗
钨
吸收(声学)
复合数
光学
谐振器
复合材料
光电子学
物理
地质学
电气工程
工程类
海洋学
冶金
超声波传感器
作者
Sichao Qu,Nan Gao,Alain Tinel,Bruno Morvan,Vicente Romero‐García,J.-P. Groby,Ping Sheng
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2022-05-20
卷期号:8 (20)
被引量:40
标识
DOI:10.1126/sciadv.abm4206
摘要
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 (~λ/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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