Results 211 to 220 of about 22,669 (255)

Sound absorption performance of a lightweight ceramic foam

Ceramics International, 2020
Abstract 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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Airflow resistivity measurement and sound absorption performance analysis of sound-absorb cotton

Applied Acoustics, 2021
Abstract 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, Xinzhong Xiong, Jinxiang Pang, Liang Wu, Heavy Zhang   +4 more
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Sound absorption performance of modified concrete: A review

Journal of Building Engineering, 2020
Abstract 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, Kim Hung Mo, Azma Putra, Siaw Chuing Loo, U. Johnson Alengaram, Tung-Chai Ling   +5 more
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On the sound absorption performance of a felt sound absorber

Applied Acoustics, 2016
Abstract 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 fibers and their composites

Science China Technological Sciences, 2012
This research aimed to study the sound absorption properties of natural fibers and their reinforced composites. Sound absorption coefficients of three types of natural fibers, i.e., ramie, flax and jute fibers and their composites were measured by the two-microphone transfer function technique in the impedance tube.
WeiDong Yang, Yan Li
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Sound absorption performance of a filled honeycomb composite structure

Applied Acoustics, 2020
Abstract 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, Shichen Yang, Chengxing Yang, Da Wang   +3 more
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Sound absorption performance of natural kenaf fibres

Applied Acoustics, 2018
Abstract 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, A. Putra, M.J.M. Nor, M.Y. Yaakob   +3 more
openaire   +1 more source