Underwater sound absorption - Open Access .click

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Investigation of Acoustic Target Strength of a Cylindrical Shell Partially Covered with Anechoic Coating

水下无人系统学报
The primary structural configuration of underwater equipment consists of cylindrical shells. To study the characteristics of the acoustic target strength(TS) of a cylindrical shell partially covered with anechoic coatings, an anechoic coating with an ...
Qi MA, Shifeng NI, Hao GENG, Haibin YANG
doaj +1 more source

Deep-subwavelength and hydrostatic-pressure-resistant meta-absorber for broadband low-frequency underwater sound

Applied Physics Express
By embedding center-supported graded-circular-plates (CS-GCPs) into an elastomer, a deep-subwavelength and hydrostatic-pressure-resistant meta-absorber was designed and manufactured for sound absorption (SA) under hydrostatic pressure.
Yanni Zhang +4 more
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Porous AlPO4 ceramic with high strength and good acoustic performance prepared by direct foaming and gel-casting

Journal of Materials Research and Technology
Acoustic stealth of underwater vehicles demands sound insulation and decoupling materials (SIDM) with good acoustic performance, high strength, and relatively low acoustic impedance. To address this, low elastic modulus AlPO4 was selected as the backbone
Bingqing Zhao +6 more
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Measuring rainfall from above and below the sea surface

Satellites play a major role in the determination of the rainfall at sea. Researchers at Southampton Oceanography Centre (SOC) have been involved in two projects addressing this task. First they have been instrumental in developing techniques to retrieve
Birch, Keith G. +4 more
core

Study on Sound Field Properties of Parametric Array Under the Influence of Underwater Waveguide Interface Scattering Based on Non-Paraxial Model—Theory and Experiment

Journal of Marine Science and Engineering
This paper theoretically and experimentally studies the effect of underwater waveguide interface scattering on the nonlinear sound field characteristics of parametric array (PA) radiation.
Yuan Cao +4 more
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Analysis of a method for precisely relating a seafloor point to a distant point on land [PDF]

A study of the environmental constraints and engineering aspects of the acoustic portion of a system for making geodetic ties between undersea reference points and others on land is described.
Lowenstein, C. D., Mcintyre, M. O., Spiess, F. N. +2 more
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Studies into the detection of buried objects (particularly optical fibres) in saturated sediment. Part 2: design and commissioning of test tank

, 2007
This report is the second in a series of five, designed to investigate the detection oftargets buried in saturated sediment, primarily through acoustical or acoustics-relatedmethods.
Evans, R.C.P., Leighton, T.G.
core

Rayleigh beam underwater metamaterial for low-frequency and broadband sound absorption

Materials Today Communications, 2023
Yu Liu +6 more
openaire +1 more source

Advancements in ship acoustic stealth technology based on acoustic absorbing and insulating metamaterials

Zhongguo Jianchuan Yanjiu
With the rapid advancement of modern underwater detection technologies, both detection accuracy and frequency coverage, particularly in the low-frequency range, have improved significantly.
Wei LI, Zhiwei SONG, Zhiyuan HE, Jiuhui WU +3 more
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Sound Absorption of the Water Column and Its Calibration for Multibeam Echosounder Backscattered Mapping in the East Sea of Korea

Applied Sciences
Multibeam echosounder (MBES) backscatter data are influenced by underwater sound absorption, which is dependent on environmental parameters such as temperature, salinity, and depth.
Seung-Uk Im +4 more
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physics