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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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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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Effects of absorption on the scattering of sound by sound
The Journal of the Acoustical Society of America, 1989The scattering of sound by sound in a lossless fluid was discussed at an earlier meeting [Berntsen et al., J. Acoust. Soc. Am. Suppl. 1 83, S4 (1988), and Darvennes and Hamilton, J. Acoust. Soc. Am. Suppl. 1 83, S4 (1988)]. Here, the effects of absorption are included.
Corinne M. Darvennes +3 more
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Absorption of sound in sea water
Ultrasonics, 1963Laboratory and field data on the absorption of sound in sea- water are reviewed in the light of modern theory, including effects of pressure, temperature and salinity. The effects of temperature and MgSO4 salt concentration appear to be compatible from one investigator to another.
M. Schulkin, H.W. Marsh
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Absorption of Sound by Vortex Filaments
Physical Review Letters, 1994The effect of an acoustic wave packet falling onto a thin 3D filament of vorticity is identified and analyzed. The wavelength of sound decreases to zero in a finite time in such a process. Therefore, even if viscosity is small the wave packets will reach the scales of strong viscous dissipation and get absorbed, transferring their energy to the thermal
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The absorption of sound in sediments
Geophysics, 1957Abstract Measurements were made of the attenuation of sound in compacted sediments in water using an ultrasonic wave train at frequencies in the megacycle range. Artificial sediments of glass spheres as well as marine sands have been tested, and the variation of absorption with frequency, mean grain size, and concentration are ...
J. Busby, E. G. Richardson
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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, 1971
Experimental measurements of the absorption of sound in still air exhibit a distinct deviation from the theoretical predictions based on known classical and molecular absorption losses. Absorption coefficients have been measured in humid air over the humidity range of 0% to 100% relative humidity.
L. B. Evans, L. C. Sutherland
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Experimental measurements of the absorption of sound in still air exhibit a distinct deviation from the theoretical predictions based on known classical and molecular absorption losses. Absorption coefficients have been measured in humid air over the humidity range of 0% to 100% relative humidity.
L. B. Evans, L. C. Sutherland
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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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On the sound absorption by openings in rooms (L)
The Journal of the Acoustical Society of America, 2012Sound absorption by openings has been rarely considered in room acoustics. In fact, information about small openings (such as ventilation grids) may sometimes be found, but nothing is said about larger openings, possibly as a consequence of the less likely occurrence in a design. In order to fill this gap, measurements were carried out in scale models,
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