Results 11 to 20 of about 47,971 (264)
ACOUSTICAL PROPERTIES OF WOOD IN 2000, 4000 AND 8000 IN HERTZ FERQUENCIES [PDF]
تحقیقات علوم چوب و کاغذ ایران, 2001 In this research solid wood properties of sound absorption coefficient in over frequency were investigated. Sound absorption at 2000, 4000 and 8000 in Hertz Frequencies was measured on the influence of effective factors in solid wood. Solid wood variable
Amir Nourbakhsh +3 more
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Study of the Sound Absorption Performance of Ethylene-Vinyl Acetate Foam Materials
Medžiagotyra, 2019 Ethylene-Vinyl Acetate (EVA) polymer foam was prepared using a mold for this investigation. The effect of the cell structure parameters and pore filling gas type on the sound absorption performance of the EVA foam materials were analyzed in terms of ...
Wei GONG +5 more
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Applied Sciences, 2022 Composite structures can be designed with specific parameters for efficient sound absorption in specific frequency bands; however, determining the optimal parameters and topology to maximize sound absorption is a computationally challenging task. In this
Junzhe Zhang +3 more
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The Absorption of Sound in Gases [PDF]
Science, 1935 Several investigators have shown recently that if the changes in the internal energy of a gas take place so slowly that they cannot follow the adiabatic changes which result when a sound wave passes through the gas, sound dispersion and anomalous absorption of observable magnitudes occur.
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Optimization of Sound Absorption Performance of OGFC Asphalt Mixture Based onAcoustic Parameters [PDF]
Zhengzhou Daxue xuebao. Gongxue banIn the phenomenological model, the sound absorption coefficient of porous materials was used to explaintakes into account the energy dissipation generated by the propagation of sound waves in the void structure.
WU Wenliang, LI Chenyue, DAI Shenglin
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Investigation of the sound absorption properties of gypsum particleboard produced with kenaf stalks and nano clay [PDF]
تحقیقات علوم چوب و کاغذ ایران, 2014 In this study sound absorption coefficient and hardness of gypsum particleboard produced with kenaf stalk and nano clay were investigated. Variables in this study were weight ratio of kenaf stalks to poplar wood in three levels (40, 50 and 60 %) and nano
Hossein Rangavar, Mohammad hassan Payan
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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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Journal of Materials Research and Technology, 2023 The sandwich structure based on Triply periodic minimal surface (TPMS) is a lightweight and high-strength multifunctional composite material that combines the versatility of heat exchange, impact resistance, and energy absorption, and has been widely ...
Pengfei Zhang +8 more
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Absorption of Sound Wave by Fabrics
Journal of the Textile Machinery Society of Japan, 1963 目的 織物の通気抵抗を測定し, 吸音特性に及ぼす通気抵抗の影響を究明する. 成果 (1) 織物の通気抵抗Rfは流速Vの関数としてRf=Ai+BiVで表わされる.AiとBiは密度と組織によって定まる常数である.同一組織であれば, 密度が小さい織物はBδ≒0, 密度が大きくなるとAi, Biともに増加する. (2) 流速の遅い範囲でRf-Aiとみなせる織物の吸音機構は完全粘性抵抗型である. (3) 完全粘性抵抗型の織物の吸音特性と通気抵抗Rfの間にはつぎの関係が成立つf0= (c/4-aiRf) d-1;α ∞=a'iRfここにα∞;最大吸音率, f0;α ∞ を示す振動数, d;織物の背後空気層の長さ, c;音速, a'i, ai;組織によって定まる常数である.
Sadao Aso, Rikuhiro Kinoshita
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e-Polymers, 2020 Porous material (PM) shows good sound absorption performance, however, the sound absorbing property of PM with different parameters are greatly different.
Wang Yonghua +5 more
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