Results 11 to 20 of about 1,253 (193)

Grating‐like anechoic layer for broadband underwater sound absorption

International Journal of Mechanical System Dynamics, 2022
To address the challenging task of effective sound absorption in the low and broad frequency band for underwater structures, we propose a novel grating‐like anechoic layer by filling rubber blocks and an air backing layer into metallic grating.
Chenlei Yu, Mingyu Duan, Wei He, Xin Chen, Fengxian Xin, Tian J. Lu   +5 more
doaj   +2 more sources

Gradient index metamaterials for broadband underwater sound absorption

APL Materials
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 ...
Xiao Pan, Xinsheng Fang, Xuewen Yin, Yan Li, Yongdong Pan, Yabin Jin   +5 more
doaj   +2 more sources

Physical Bounds on Underwater Sound Absorption by Coatings

Acoustics
The development of sound-absorbing coatings for underwater structures has attracted significant attention due to their critical role in stealth and noise mitigation.
James McDaniel, Gerson Amaya, Lisa Dangora, Elizabeth Magliula   +3 more
doaj   +2 more sources

Metasurfaces with Embedded Rough Necks for Underwater Low-Frequency Sound Absorption

Applied Sciences
Marine noise pollution is a significant threat to global marine ecosystems and human activities. Most underwater sound-absorbing materials operate in the mid-to high-frequency bands (typically 1–10 kHz for mid-frequency and above 10 kHz for high ...
Dan Xu, Yazhou Zhu, Sha Wang, Zhenming Bao, Ningyu Li   +4 more
doaj   +2 more sources

Review of underwater sound absorption materials

IOP Conference Series: Earth and Environmental Science, 2020
Abstract Underwater sound absorption is becoming more and more important for underwater military equipment. Underwater acoustic stealth technology is constantly developing, we have conducted a research, summary and classification of underwater sound stealth materials.
Jianzhu Dong, Pengyu Tian
openaire   +1 more source

Numerical design and optimization of metamaterials for underwater sound absorption at various hydrostatic pressures

Journal of Low Frequency Noise, Vibration and Active Control, 2023
Underwater sound absorption materials with a stable performance at various hydrostatic pressures are important for marine applications. However, most studies about underwater sound absorption materials only focused on the performance at atmospheric ...
Yifeng Fu, Huming Wang, Pan Cao
doaj   +1 more source

Deep subwavelength hybrid metamaterial for low-frequency underwater sound absorption by quasi-Helmholtz resonance

AIP Advances, 2023
We proposed an acoustic metamaterial with deep subwavelength thickness for low-frequency underwater sound absorption. The proposed hybrid metamaterial has a perforated facesheet, a fluid-filled square honeycomb core with inside rubber coating, and a ...
Mingyu Duan, Chenlei Yu, Fengxian Xin, Tian Jian Lu   +3 more
doaj   +1 more source

Sound absorption performance analysis of anechoic coating under hydrostatic pressure considering cavity pressure

Zhongguo Jianchuan Yanjiu, 2022
ObjectivesAn underwater anechoic coating layer laid on the hull surface of a submarine is squeezed under the action of high hydrostatic pressure, changing its shape and material parameters, which has a great impact on sound absorption performance ...
Wenkai DONG, Meixia CHEN
doaj   +1 more source

A hybrid acoustic structure for low-frequency and broadband underwater sound absorption

Journal of Low Frequency Noise, Vibration and Active Control, 2022
The underwater anechoic coating with local resonant units is an effective method to achieve low-frequency sound absorption. However, the structure obtained in this way is not satisfactory in the sound absorption effect of mid-high frequency bands ...
Xinyu Jia, Guoyong Jin, Kangkang Shi, Chunyang Bu, Tiangui Ye   +4 more
doaj   +1 more source

Highly efficient underwater acoustic absorber designed by filled-microperforated plate-like structure: Aging and life prediction

Polymer Testing, 2023
The underwater sound absorption material for submarines should fulfill the demand for remarkable performance in medium-low frequency sound absorption at low thicknesses.
Jingjing Nan, Lingjie Yu, Mingjuan Du, Jiaguang Meng, Zijing Dong, Menghe Miao, Chao Zhi   +6 more
doaj   +1 more source