Results 271 to 280 of about 3,088,219 (346)
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The Journal of the Acoustical Society of America, 1973
The exact solution for first order nonlinear scattering of two plane waves of sound [J. Acoust. Soc. Amer. 29, 934 0957)] showed the scattered density to be ρs = c0−2E12+12ω1−1ω2−1(cosθ+12Λ)[sin−2(12θ)]∇2W12. The singularity at θ = 0, which occurs when the primary waves are collinear, may be removed by applying to this solution the operator {1 − exp[(|∂
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The exact solution for first order nonlinear scattering of two plane waves of sound [J. Acoust. Soc. Amer. 29, 934 0957)] showed the scattered density to be ρs = c0−2E12+12ω1−1ω2−1(cosθ+12Λ)[sin−2(12θ)]∇2W12. The singularity at θ = 0, which occurs when the primary waves are collinear, may be removed by applying to this solution the operator {1 − exp[(|∂
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The Journal of the Acoustical Society of America, 1992
The present invention aims at providing a sound barrier member that will enable a sound barrier to be constructed that provides good prevention of sound transmission as well as prevention of sound reflection while remaining relatively inexpensive to produce, the sound barrier member comprising an enclosure in a generally panel like configuration having
Ronald Barden, Philip J. West
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The present invention aims at providing a sound barrier member that will enable a sound barrier to be constructed that provides good prevention of sound transmission as well as prevention of sound reflection while remaining relatively inexpensive to produce, the sound barrier member comprising an enclosure in a generally panel like configuration having
Ronald Barden, Philip J. West
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The Journal of the Acoustical Society of America, 1999
A sound absorption structure which is mainly applied to an intake system of an automotive engine for suppressing noise level. The sound absorption structure comprises a base duct portion, and an extended duct portion in which a sound absorption material is installed, and a Helmholtz resonator.
Kyoichi Watanabe, Kouichi Nemoto
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A sound absorption structure which is mainly applied to an intake system of an automotive engine for suppressing noise level. The sound absorption structure comprises a base duct portion, and an extended duct portion in which a sound absorption material is installed, and a Helmholtz resonator.
Kyoichi Watanabe, Kouichi Nemoto
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Ultra-broadband sound absorption of a hierarchical acoustic metamaterial at high temperatures
, 2021We develop a hierarchical acoustic metamaterial with ultra-broadband sound absorption and promising applications at high temperatures as a super sound absorber.
Zhendong Li +4 more
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Ultralight Single‐Walled Carbon Nanotube Aerogels for Low‐Frequency Sound Absorption
Advanced Engineering Materials, 2022Absorbing low‐frequency sound below 1000 Hz with an ultralight material is a critical challenge. Nanofibrous sound‐absorbing materials have many interfaces for air‐borne sound loss.
Reo Yanagi +3 more
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Journal of Physics D: Applied Physics, 2022
Broadband sound absorption has consistently been a challenge in designing underwater sound absorption structure (USAS). Most research of USASs achieve broadband sound absorption through structural optimization, which curbs the freedom of designing, and ...
Ying-ying Sun +7 more
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Broadband sound absorption has consistently been a challenge in designing underwater sound absorption structure (USAS). Most research of USASs achieve broadband sound absorption through structural optimization, which curbs the freedom of designing, and ...
Ying-ying Sun +7 more
semanticscholar +1 more source
Simplified Measurements of Sound Absorption
Transactions of the American Institute of Electrical Engineers, 1934A modification of the tube or reflected wave method for measuring the sound absorption coefficients of acoustic and building materials over a wide frequency range is described in this paper. Modern communication equipment is used, and a high degree of reliability is obtained.
Arthur L. Albert, Tom B. Wagner
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Perfect sound absorption of Helmholtz resonators with embedded channels in petal shape
Journal of Applied Physics, 2021The acoustic metamaterial in the form of a petal-shaped channel embedded Helmholtz resonator (P-CEHR) is proposed for perfect sound absorption. According to theoretical predictions, numerical simulations, and experiments, the P-CEHR achieves perfect low ...
Mingyu Duan +4 more
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Investigation of broadband sound absorption of smart micro-perforated panel (MPP) absorber
, 2021A smart micro-perforated panel (MPP) is investigated in order to enhance sound absorption performance of MPP absorbers, especially at low frequencies. The smart MPP consists of a conventional MPP and a surface-bonded piezoelectric ceramic (PZT) shunted ...
Xiang Liu +3 more
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The Journal of the Acoustical Society of America, 1977
Sound attenuation is usually obtained by means of absorbing materials. This technique, which works quite well for sounds of medium and high frequencies, is very inefficient at low frequencies, because the thickness of absorbing material necessary to produce a constant attenuation increases with decreasing frequency.
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Sound attenuation is usually obtained by means of absorbing materials. This technique, which works quite well for sounds of medium and high frequencies, is very inefficient at low frequencies, because the thickness of absorbing material necessary to produce a constant attenuation increases with decreasing frequency.
openaire +1 more source