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Superspreading-Based Fabrication of Poly(methyl methacrylate) Films with High Toughness for Ultra-Wideband Flexible Transparent Antenna. [PDF]
Materials (Basel)Liu Y +6 more
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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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Sound absorption characteristics of the two-dimensional dual-graded anechoic coating
Japanese Journal of Applied Physics, 2023Abstract The anechoic coating can be applied to absorb underwater sound waves. To improve the performance of the current anechoic coating, a two-dimensional dual-graded anechoic coating (2D DGAC) which consists of background material, graded solid cores, and graded cavities has been proposed.
Xiuhai Zhang +3 more
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Particle-loaded composites for acoustic anechoic coatings
Journal of Sound and Vibration, 1995Summary: We consider here composite coating layers to be used as ''acoustic absorbers'' which are able to attenuate broad-banded acoustic signals and minimize reflection. In order to effectively attenuate the acoustic wave, a loaded composite coating layer is designed with a binder material and loading configuration combination that allows both ...
Hinders, M. K. +2 more
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Tri-component phononic crystals for underwater anechoic coatings
Physics Letters A, 2007Localized resonance in phononic crystal, composed of three-dimensional arrays of composite units, has been discovered recently. The composite unit is a high-density sphere coated by soft silicon rubber. In this Letter, the absorptive properties induced by the localized resonance are systemically investigated.
Honggang Zhao +4 more
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Applied Acoustics, 2021
Abstract A novel method to identify the viscoelastic parameters of underwater anechoic coating has been proposed in this present study. Based on two sets of measured reflection coefficients, the viscoelastic parameters can be identified by using the combination of finite element method and Newton's iterative method.
Yibo Ke +3 more
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Abstract A novel method to identify the viscoelastic parameters of underwater anechoic coating has been proposed in this present study. Based on two sets of measured reflection coefficients, the viscoelastic parameters can be identified by using the combination of finite element method and Newton's iterative method.
Yibo Ke +3 more
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Topology optimization of anechoic coating for maximizing sound absorption
Journal of Vibration and Control, 2016Anechoic coatings, attached to the surface of underwater vehicles, are an effective way to absorb the incident sound from active sonars. It is well known that a homogeneous viscoelastic material layer with limited thickness does not provide significant sound absorption performance, thus, anechoic coatings embedded with air cavities are being used for ...
Jingru Li, Sheng Li
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Sound absorption of a rib-stiffened plate covered by anechoic coatings
The Journal of the Acoustical Society of America, 2015Underwater vehicles are often equipped with anechoic coatings to absorb the sound waves of active sonar and attenuate the noise emitted from the vessels. Rubber layers with periodically distributed air cavities are widely used as anechoic coatings.
Xinyi, Fu +3 more
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Anechoic and decoupling coating
The Journal of the Acoustical Society of America, 1996An anechoic and decoupling coating for use on the surface of an underwatertructure for decoupling structural vibrations from the water and for absorbing waterborne acoustic waves directed toward the structure from an external source such as a sonar. The coating is an elastomeric matrix containing sealed air-filled cavities as well as random labyrinths ...
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Anechoic coating for acoustic waves
The Journal of the Acoustical Society of America, 1990To manufacture an anechoic coating which prevents a wall from reflecting acoustic waves, the wall is coated with an elastic material of low compressibility, which is highly absorbent under shear stresses, and then with a highly compressible layer of material.
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