Results 141 to 150 of about 1,253 (193)
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Low-frequency underwater sound absorption metamaterial
Physica Scripta, 2022Abstract Air bubbles in liquid are known for exhibiting low-frequency resonance and can be considered as passive scatterers. In this paper, we design an acoustic metamaterial consisting of an air bubble in a water-filled metal shell with an opening to develop low frequency underwater sound absorber. Numerical simulation is carried out
Tian Wang +3 more
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Underwater sound absorption of a meta-absorption layer with double negativity
Applied Acoustics, 2021Abstract An underwater meta-absorption layer (MAPL) is presented which consists of multiple steel scatters and a rubber matrix. Double negativity of the MAPL can be found within multiple frequency ranges with the effective medium method due to local resonance and wave scattering.
Ting Wang, Junyi Liu, Meixia Chen
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Underwater sound absorption performance of exponential gradient anechoic coating
Modern Physics Letters B, 2022In this paper, the gradient anechoic coating whose density changes exponentially along direction of thickness is investigated. A numerical model is established by finite element method (FEM) to analyze the underwater sound absorption performance under different density distribution.
Teng-Fei Si +3 more
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Acoustically sticky topographic metasurfaces for underwater sound absorption
The Journal of the Acoustical Society of America, 2018A class of metasurfaces for underwater sound absorption, based on a design principle that maximizes thermoviscous loss, is presented. When a sound meets a solid surface, it leaves a footprint in the form of thermoviscous boundary layers in which energy loss takes place. Considered to be a nuisance, this acoustic to vorticity/entropy mode conversion and
Hunki, Lee +6 more
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Underwater sound absorption property of porous aluminum
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2001Abstract Porous aluminum was prepared by negative pressure infiltration process using removable granules. Underwater sound absorption coefficient α of the porous aluminum was determined by a pulse tube method. The relationship between α and pore structure of porous aluminum was studied.
Cheng Guiping, He Deping, Shu Guangji
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Some Experiments in Underwater Sound Absorption
The Journal of the Acoustical Society of America, 1961This paper discusses some experimental techniques for the measurement of sound absorbing materials in the 2- to 10-kc range. The experimental technique discussed is that of decay time measurements of a reverberant chamber. Several different kinds of signals have been used—namely pulsed sine waves, pulsed noise, and an impulse signal generated by the ...
R. A. Rubega, A. Culver
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PDMS/MWCNT nanocomposite films for underwater sound absorption applications
Journal of Materials Science, 2020Polydimethylsiloxane (PDMS) nanocomposite films for underwater sound absorption applications are presented. Films were fabricated by a spin coating method and characterized using XPS, FTIR, TGA, SEM, tensile testing, and elastic cold-neutron scattering.
I. I. Kabir +8 more
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Porous-Solid Metaconverters for Broadband Underwater Sound Absorption and Insulation
Physical Review Applied, 2023202502 bcch ; Version of Record ; Others ; National Natural Science Foundation of China; Beijing Institute of Technology Research Fund Program for Young Scholars ; Published ; VoR ...
Hao-Wen Dong +7 more
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Underwater sound absorption characteristics of various species of wood
The Journal of the Acoustical Society of America, 1977In this experimental investigation, the acoustic absorption characteristics of various species of wood, rubber, and wood/rubber composites were determined under low hydrostatic pressure and over the frequency range 10–50 kHz. The test samples, including white pine, douglas fir, redwood, fir plywood, Saper-Trubber, and bubble rubber were typically 4 ft ...
G. C. Lauchle, F. A. Barge
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The Journal of the Acoustical Society of America, 2023
The underwater sound absorption technique in low-frequency and broadband has far-reaching prospects since it is essential for noise reduction of deep-sea operation requirements and evading advanced underwater target detection. Here, we propose an underwater sound-absorbing composite lattice with low-frequency and ultra-broadband characteristics.
Botao Liu +7 more
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The underwater sound absorption technique in low-frequency and broadband has far-reaching prospects since it is essential for noise reduction of deep-sea operation requirements and evading advanced underwater target detection. Here, we propose an underwater sound-absorbing composite lattice with low-frequency and ultra-broadband characteristics.
Botao Liu +7 more
openaire +2 more sources