Results 21 to 30 of about 2,739,672 (219)
Absorption of Sound by a Strip of Absorptive Material in a Diffuse Sound Field
The Journal of the Acoustical Society of America, 1959 The random incidence sound absorption coefficient is calculated for a narrow strip of absorbing material set in an otherwise reflecting plane. The assumptions made are that the material is of the locally reacting type, with a real normal admittance. The effect of an imaginary component of admittance is discussed qualitatively.
Northwood, T. D. +2 more
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Sound absorption by clamped poroelastic plates [PDF]
, 2008 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.
Attenborough K. +4 more
core +1 more source
Atmospheric Absorption of Sound [PDF]
The Journal of the Acoustical Society of America, 1972 By assuming air is composed of four gases, i.e., nitrogen, oxygen, water vapor, and carbon dioxide, and applying energy transfer rates for the binary collisions inherent in such a system, absorption of sound in the atmosphere has been predicted. The calculated curves based upon 24 energy transfer mechanisms are compared with experimental data over the ...
Louis C. Sutherland +2 more
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Nonlocal acoustic metasurface for ultrabroadband sound absorption
Physical review B, 2021 Classical meta-absorber designs usually have a tradeoff between bandwidth, efficiency, and thickness. Here, we introduce the concept of a nonlocal acoustic metasurface absorber by using a bridge structure connecting resonating unit cells to improve the ...
Yifan Zhu +5 more
semanticscholar +1 more source
Sound absorption properties of wood-based pulp fibre foams
Cellulose, 2021 In this study, sound absorbing materials were produced through foam forming technique using hardwood and softwood pulps with varying chemical composition, ultrastructural, and morphological properties as raw materials.
Jose Cucharero +4 more
semanticscholar +1 more source
Acoustic contributions of a sound absorbing blanket placed in a double panel structure: Absorption Versus Transmission [PDF]
The Journal of the Acoustical Society of America 128, 2 (2010) 8, 2010 The objective of this paper is to propose a simple tool to estimate the absorption vs. transmission loss contributions of a multilayered blanket unbounded in a double panel structure and thus guide its optimization. The normal incidence airborne sound transmission loss of the double panel structure, without structure-borne connections, is written in ...
arxiv +1 more source
Development of biodegradable composite micro-perforated panel made from natural fibre composites with evaluation of its acoustic and mechanical properties [PDF]
, 2020 Micro-perforated panel (MPP) has been widely considered as a promising alternative for sound absorption purposes. Plenty of research has been done to improve the sound absorption of MPP but no specific work highlights the material structure effect ...
Chin, Desmond Daniel Vui Sheng
core
Sound Absorption Properties of Natural Fibers: A Review
Sustainability, 2020 In recent years, in an attempt to substitute the conventional synthetic sound absorption material, natural fibers and their sound absorption properties have been increasingly studied.
Tao Yang +6 more
semanticscholar +1 more source
Sound Absorption of Curtains [PDF]
The Journal of the Acoustical Society of America, 1970 The absorption of normal incident sound by a curtain hung flat before a wall depends on the flow resistivity and the weight of the material and the distance to the wall, as has been found experimentally and could be deduced theoretically. The same theory allows one to calculate the absorption for oblique incident and, also therefore, for statistical ...
openaire +2 more sources
Sound Absorption of Snow [PDF]
Nature, 1939 THE impressive and all-pervading quietness following a fall of snow is a commonplace experience, though, so far as we are aware, no measurements of the sound absorption of snow have been published. The recent cold spell provided a suitable opportunity to make such measurements in the reverberation chamber of the National Physical Laboratory.
G. W. C. Kaye, E. J. Evans
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