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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 Performance of Membrane Covered Insulators
SAE Technical Paper Series, 2001<div class="htmlview paragraph">Molded fiberglass hood insulators (hoodliners) and engine side dash insulators (dashliners) are widely applied in vehicles for noise control. These absorptive components reduce reverberant “build-up” in the engine compartment and thus cut the noise transmission into the passenger compartment. Due to restrictions of
Geoffrey Shao, Trevor Billy, Tony Hughes
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Optimization of sound absorption performance of a new ecological material
The Journal of the Acoustical Society of America, 2013Material selection is foremost design parameter in providing acoustical comfort levels in both acoustically sensitive and noise generating spaces ranging from the small size meeting halls to large scale multipurpose auditoriums and even from foyers to shopping malls. Architects usually prefer seamless, unperforated materials in line with their interior
Seda Karabulut, Mehmet Çalışkan
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Sound absorption performance and mechanism of flexible PVA microperforated membrane
Applied Acoustics, 2022Abstract A flexible micro-perforated material was fabricated for acoustic application in this study, which is different from the traditional perforated material whose general impression is rigid, dense and inflexible. The raw material is polyvinyl alcohol and develop into PVA nanofiber membranes by electrospinning.
Jiahui Shen, Heow Pueh Lee, Xiong Yan
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Sound absorption performance of recycled porous aluminum sheet
The Journal of the Acoustical Society of America, 1996The goal of this work was to evaluate the performance of the sound absorption for the recycled porous aluminum sheet instead of the traditional glass wool panel. A rectangular cavity had a wall to provide sound-pressure excitation, and its facing wall was covered with a porous aluminum sheet. The noise reduction effect was observed by the comparison of
Jae-Eung Oh +4 more
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Effect of the microscale of the nanofiber membranes on their sound absorption performance
The Journal of the Acoustical Society of AmericaNanofiber membranes (NMs), fabricated via electrospinning of poly(vinylidene fluoride-co-hexafluoropropylene) solution, can effectively enhance the sound absorption coefficient (SAC) of porous materials with minimal mass and space requirements, making them appealing for aircraft noise reduction.
Chuang Liu +4 more
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Programmable sound absorption performance enabled by 3D printed fibers
INTER-NOISE and NOISE-CON Congress and Conference Proceedings, 2023Design of acoustic materials can be achieved through the connection between their geometry and acoustical performance. Here, we propose 3D-printing as an enabling technology that allows us to precisely control an acoustic material's micro-geometry and orientation, which then eliminates microscopic geometry bias due to conventional manufacturing ...
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The impact of neck material on the sound absorption performance of Helmholz resonator
The Journal of the Acoustical Society of America, 2013Helmholtz resonator is an effective acoustic attenuation device at low frequencies and is generally used as passive damper. In this work, parallel perforated ceramics with different perforation diameters were used to improve acoustic impedance at the entry of the resonator and thus achieve better acoustic absorption coefficient and better absorption ...
Dong Yang, Min Zhu, Xiaolin Wang
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Studies on sound absorption performance of porous materials at low temperature
The Journal of the Acoustical Society of America, 2019The acoustical parameters of porous materials are usually tested at normal temperature. In recent years, spaces need acoustical treatments at low temperature spring up with the dynamic tendency of projects such as snow theme parks and high speed trains traveling in the frozen region.
Xiwei Wang +3 more
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Improved low-frequency performance of a composite sound absorption coating
Journal of Vibration and Control, 2011In order to improve the low-frequency acoustic performance, a composite sound absorption coating made by embedding another viscoelastic material into the viscoelastic substrate of the traditional sound absorption coating, has been developed. Compared to the substrate, the transverse wave speed of the embedded-layer is lower. Accounting for the symmetry,
Tao Meng, Hua Hong-Xing
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