منابع مشابه
Effect of non-acoustic properties on the sound absorption of polyurethane foams
In this paper the influence of non-acoustic properties on the sound absorption coefficient of polyurethane foams as a porous medium is investigated. Biot’s equations with transfer matrix method, as the solution approach are employed to evaluate the sound absorption coefficient of selected polyurethane foams. The major issue is the dependency of non-acoustic properties on each other which makes ...
متن کاملInvestigation of Acoustic Properties of Polymer Nanocomposites regarding Combined Sound Absorption and Insulation Characteristics
Introduction: Nowadays multiple techniques have been developed to noise control. One the most important way is the control based on sound absorption and insulation. The purpose of current study was to improve the acoustic properties of soft polyurethane foam regarding combined sound absorption and insulation characteristics. Materials and Methods: Polyacrylonitrile and polyvinylidine fluoride ...
متن کاملSound Absorption in the Workplace
The results are in. Recent studies conducted by an independent testing laboratory show that when it comes to acoustics, commercial cushion makes carpet even better. To specifiers and end-users, it will come as no surprise that properly specified carpet cushion reduces noise when used in a commercial installation. What will be of interest is the degree of improvement that has been quantified in ...
متن کاملLaboratory Test of Sound Absorption of Vegetation
In street canyons, with increasing absorption and diffusion of street boundaries and furniture, the sound attenuation along the length could be increased. Well designed and placed vegetation could have similar effects. Therefore, knowledge of such acoustic properties of vegetation is required to accurately predict sound propagation and optimise the use of green surfaces for reducing the noise i...
متن کاملSound absorption by clamped poroelastic plates.
Measurements and predictions have been made of the absorption coefficient and the surface acoustic impedance of poroelastic plates clamped in a large impedance tube and separated from the rigid termination by an air gap. The measured and predicted absorption coefficient and surface impedance spectra exhibit low frequency peaks. The peak frequencies observed in the absorption coefficient are clo...
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ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 1970
ISSN: 0001-4966
DOI: 10.1121/1.1975298