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Sound absorption polyimide composite aerogels for ancient architectures’ protection
Advanced Composites and Hybrid Materials, 2023Xingyu Zhao +5 more
semanticscholar +1 more source
The Absorption of Sound in Cellular Foams
Noise Control and Acoustics, 2004Porous materials are often used as sound absorbers in a variety of situations including architectural and industrial applications. In many cases it is advantageous for the material to be both lightweight and rigid. Metal foams, originally developed for use in catalytic converters in car exhaust systems, offer an attractive mix of properties being both ...
Dupère, Iain D J +2 more
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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
openaire +2 more sources
A scalable high-porosity wood for sound absorption and thermal insulation
Nature Sustainability, 2023Xinpeng Zhao +21 more
semanticscholar +1 more source
On the sound absorption in ferrodielectrics
Physics Letters A, 1977Abstract The damping of the sound waves in ferromagnets due to the phonon-magnon interaction is considered for the temperature θ c ( μM 0 4 7θ c ) 4 7 ⪡ T ⪡ θ 2 D 4 7θ c and frequency τ−1m-ph ⪡ ω ⪡ τ−1m ranges.
O.A. Olkhov, S.P. Semin, V. S. Lutovinov
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Absorption of sound in the Martian atmosphere
The Journal of the Acoustical Society of America, 2001Future missions to the planet Mars might include microphones to listen for sounds in the tenuous Martian atmosphere. The chemical composition of the atmosphere is well established by previous missions and ground based observations. The dominant constituent is CO2 with a minor amount of N2 and Argon and smaller amounts of H2O.
James P. Chambers, Henry E. Bass
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Ceramic Material for Sound Absorption
Noise & Vibration Worldwide, 2015The acoustic correction of large places for low frequency components can be obtained by inserting acoustic resonators. This paper reports the realization and the experimental verification of acoustic resonators obtained with ceramic material. The sound absorption is obtained by drilling the specimens of ceramic material with a hole size of 2 mm and 5 ...
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The Journal of the Acoustical Society of America, 1977
An equation for sound absorption in Lyman and Fleming sea water (S= 35‰, pH=8) is presented as a function of frequency. temperature, and pressure. It represents the contributions to absorption due to boric acid, magnesium sulfate, and water. The pressure effect on sound absorption by magnesium sulfate is treated in more detail than Schulkia and March ...
F. H. Fisher, V. P. Simmons
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An equation for sound absorption in Lyman and Fleming sea water (S= 35‰, pH=8) is presented as a function of frequency. temperature, and pressure. It represents the contributions to absorption due to boric acid, magnesium sulfate, and water. The pressure effect on sound absorption by magnesium sulfate is treated in more detail than Schulkia and March ...
F. H. Fisher, V. P. Simmons
openaire +2 more sources