Results 211 to 220 of about 21,617 (259)
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Airflow resistivity measurement and sound absorption performance analysis of sound-absorb cotton
Applied Acoustics, 2021Abstract Porous materials are widely used for noise control treatments. Sound-absorb cotton is commonly used in the transportation industry such as automobiles and airplanes because of its excellent sound absorption performance. In this paper, two typical acoustical models were used to evaluate the sound absorption coefficient of sound-absorb cotton.
Xuewen Liu +4 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 performance of modified concrete: A review
Journal of Building Engineering, 2020Abstract Concrete, known as the second most consumed material in the world after water, is a versatile, inexpensive and durable construction material. Due to its high density, concrete is usually employed as rigid walls in buildings and also as sound barrier in highway.
Tzer Sheng Tie +5 more
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Sound absorption performance of a lightweight ceramic foam
Ceramics International, 2020Abstract Porous materials can be effective for sound absorption and noise reduction. A kind of lightweight cellular ceramic foam with bulk density of 0.38–0.56 g cm-3 was successfully prepared by conventional molding with pore forming agent. The porosity is from 76.4% to 83.7% for the sample with relatively large pores (the average pore size: 5.3–5.6
J.H. Chen, P.S. Liu, J.X. Sun
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On the sound absorption performance of a felt sound absorber
Applied Acoustics, 2016Abstract In this work, we have developed an analytical model of a multilayer porous material based on the transfer matrix method to predict the absorption behavior at plane wave incidence. The aim of this study is to modify/tune the sound absorption coefficient of a felt to obtain an improved absorbing performance in the mid frequency range without ...
Cem Meriç, Haluk Erol, Aytekin Özkan
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Sound absorption performance of natural kenaf fibres
Applied Acoustics, 2018Abstract In recent years, kenaf fibre has been highlighted for its superiority as the filler for composite materials. However, study of the fibres as an acoustic absorber is still lacking. In this paper, the sound absorption of kenaf fibre specimens are studied both under normal and random sound incidence.
Z.Y. Lim +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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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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Sound absorption performance of a filled honeycomb composite structure
Applied Acoustics, 2020Abstract A new composite structure was formed by filling Nomex honeycomb with polyester fibre to achieve the goal of improving its acoustic characteristics. By using the impedance tube method, the sound absorption coefficient (SAC) of porous materials was determined. Moreover, the effects of different specifications of honeycomb, porosities of fibre,
Suchao Xie +3 more
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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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