Results 111 to 120 of about 474 (141)
Some of the next articles are maybe not open access.
Liquid-solid synergistic mechanism sound absorption for underwater anechoic coating
International Journal of Mechanical SciencesNingdong Hu, Hongping Hu
exaly +2 more sources
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
openaire +1 more source
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
openaire +1 more source
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 ...
openaire +1 more source
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.
openaire +1 more source
Research on a Design Method of Generative Model for Cavity Section Shape of an Anechoic Coating
Advances in Engineering Technology Research, 2023One of the main challenges of the low frequency, broadband and strong sound absorption performance of an anechoic coating is the design of the cavity section shape. A generative-based design method was investigated in this study. Two generative-based models were trained to design the cavity section shape of anechoic coatings with a highly efficient ...
Yiping Sun, Meng Tao
openaire +1 more source
Journal of Science and Technique, 2021
This paper presents a simulation-based model for predicting the acoustic properties of underwater anechoic structures with its main layer made of viscoelastic sound absorbing materials including air-filled cavities. Some preliminary numerical results are first compared with the published analytical and experimental data to validate the proposed ...
openaire +1 more source
This paper presents a simulation-based model for predicting the acoustic properties of underwater anechoic structures with its main layer made of viscoelastic sound absorbing materials including air-filled cavities. Some preliminary numerical results are first compared with the published analytical and experimental data to validate the proposed ...
openaire +1 more source
A Wide Band Strong Acoustic Absorption in a Locally Network Anechoic Coating
Chinese Physics Letters, 2009Composite materials with interpenetrating network structures usually exhibit unexpected merit due to the cooperative interaction. Locally resonant phononic crystals (LRPC) exhibit excellent sound attenuation performance based on a periodical arrangement of sound wave scatters.
Jiang Heng +5 more
openaire +1 more source
Numerical design of Alberich anechoic coatings with superellipsoidal cavities of mixed sizes
The Journal of the Acoustical Society of America, 2008Thin rubber coatings with cavities in a doubly periodic lattice are able to reduce reflections of underwater sound by redistributing normally incident energy such that absorption in the surrounding rubber is enhanced. For spherical scatterers, the anechoic effect can be studied numerically by the layer multiple-scattering method.
openaire +2 more sources
Performance study of preliminary mini anechoic chamber fitted with coconut shell coated absorbers
2013 IEEE International Conference on Control System, Computing and Engineering, 2013An anechoic chamber is considered good when there is no signal reflection inside the chamber and also when there is no incoming signal from outside the chamber. The key element inside an anechoic chamber is the absorbing material. The evaluations of mini anechoic chamber fitted with coated absorbers were carried out by analyzing the absorption ...
Hasnain Abdullah Idris +11 more
openaire +1 more source