材料科学
超材料
宽带
水下
吸收(声学)
声学
消声室
声压
静水压力
谐振器
光学
光电子学
物理
热力学
海洋学
地质学
作者
Xiao Pan,Xinsheng Fang,Xuewen Yin,Yan Li,Yongdong Pan,Yabin Jin
出处
期刊:APL Materials
[American Institute of Physics]
日期:2024-03-01
卷期号:12 (3)
被引量:5
摘要
The underwater broadband anechoic coating is highly demanded in acoustic stealth for underwater vehicles. In this work, we propose a gradient index metamaterial for broadband underwater sound absorption, which is further experimentally validated under high pressure conditions. The gradient index metamaterial consisting of radius-varied cavities in rubber allows the sound waves to follow the objective trajectory in a broad band with impedance matching at the interface with water. The viscosity of the materials and the coupling effect among the gradient cavities contribute to broadband sound absorption. The performance of broadband sound absorption from 1 to 10 kHz is validated experimentally, which agrees well with the theoretical and numerical results. We further experimentally demonstrate the sound absorption performance with hydrostatic pressure up to 3 MPa and analyze the mechanism of the sound absorption deviation caused by high pressures. The proposed gradient index metamaterial provides a simple and efficient way to develop underwater broadband acoustic coatings.
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