Gradient index metamaterials for broadband underwater sound absorption

Author:

Pan Xiao1ORCID,Fang Xinsheng23ORCID,Yin Xuewen3,Li Yan1,Pan Yongdong1ORCID,Jin Yabin14ORCID

Affiliation:

1. School of Aerospace Engineering and Applied Mechanics, Tongji University 1 , 200092 Shanghai, China

2. Department of Basic Science and Technology Research, Taihu Laboratory of Deepsea Technological Science 2 , 214082 Wuxi, China

3. National Key Laboratory on Ship Vibration and Noise, China Ship Scientific Research Center 3 , 214082 Wuxi, China

4. 4 Shanghai Key Laboratory of Intelligent Sensing and Detection Technology, School of Mechanical and Power Engineering, East China University of Science and Technology, 200237 Shanghai, China

Abstract

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.

Funder

National Natural Science Foundation of China

China Association for Science and Technology

Science and Technology Innovation Plan of Shanghai Science and Technology Commission

Tongji University

Publisher

AIP Publishing

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