Sound attenuation through absorption by vegetation.
نویسندگان
چکیده
منابع مشابه
Laboratory 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...
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An analytical overview of research involving EM waves attenuation by vegetation canopies in the frequency range 100...10000 MHz is given. Brief descriptions of objects of investigation and typical biometric features are presented. The models of vegetation as a continuous medium and as a collection of scatterers are considered. Dielectric properties of vegetative material are discussed. The rela...
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In this study we model the sound attenuation properties of a hearing aid earmold tube. The model includes thermoviscous acoustic effects and it couples structural vibrations to the external acoustic field. Moreover, the finite element domain is coupled at two boundaries with an electroacoustic model of a hearing aid and an acoustic 2-cc coupler.
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...
متن کاملSome Physical and Psychological Aspects of Noise Attenuation by Vegetation
-The physical mechanisms governing sound attenuation by foliage, stems, and ground are reviewed. Reflection of sound energy is found to be the primary mechanism. In addition, new experimental results are discussed that help to quantify the psychological effect of a plant barrier on perceived noise level. Listeners judged the loudness of noise transmitted through hemlock trees and through a mini...
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ژورنال
عنوان ژورنال: Journal of the Acoustical Society of Japan (E)
سال: 1996
ISSN: 0388-2861,2185-3509
DOI: 10.1250/ast.17.175