Results 321 to 330 of about 2,706,203 (393)
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Enhancing of broadband sound absorption through soft matter.
Materials Horizons, 2021This paper proposed a metamaterial design method that uses soft matter for constructing a unique soft acoustic boundary to effectively improve broadband sound absorption performance.
Fuyin Ma +4 more
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The Journal of the Acoustical Society of America, 1986
Two pelts of fiberglass are bonded together to form a sound absorption panel. One pelt is deformed to a sawtooth shape and the teeth of the sawtooth pelts are bonded into grooves in the other pelt which is essentially flat except for the grooves.
Wilbur D. Holben, Jerry M. Wolf
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Two pelts of fiberglass are bonded together to form a sound absorption panel. One pelt is deformed to a sawtooth shape and the teeth of the sawtooth pelts are bonded into grooves in the other pelt which is essentially flat except for the grooves.
Wilbur D. Holben, Jerry M. Wolf
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Acoustic labyrinthine porous metamaterials for subwavelength low-frequency sound absorption
, 2021An acoustic labyrinthine porous metamaterial (ALPM) or the so-called acoustic labyrinthine metaporous surface is designed for the subwavelength sound absorption by perforating folded slits in a porous material matrix.
Xuewei Liu +4 more
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The Absorption of Sound in Air
The Journal of the Acoustical Society of America, 1953A detailed review will be presented, summarizing available data on absorption of sound in homogeneous air and its main constituents as a function of frequency, pressure, temperature, and humidity. Disagreement exists between results of the various investigators, especially when different techniques are used.
W. L. Nyborg, J. F. S. Y. Lee
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Absorption of Sound in Insulators
Physical Review, 1961The theory of sound attenuation in structurally perfect dielectric crystals is extended and applied to recent experiments on the absorption of acoustic waves in crystalline quartz at frequencies from ${10}^{9}$ cps to 2.4\ifmmode\times\else\texttimes\fi{}${10}^{10}$ cps.
H. Ehrenreich, Truman O. Woodruff
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Sound Absorption in Electrolytes
The Journal of the Acoustical Society of America, 1965Further ultrasonic-absorption measurements have been made at 104–108 cps in a number of electrolytes including iodides, chlorides, acetates, acetic acid, and mixtures of electrolytes. A number of these electrolytes exhibit interesting relaxation effects, which have been interpreted quantitatively in terms of specific ion-ion and ion-solvent ...
Ernest Yeager +2 more
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Labyrinthine acoustic metastructures enabling broadband sound absorption and ventilation
, 2020There is growing interest in the development of path coiling-based labyrinthine acoustic metamaterials for realizing extraordinary acoustical properties such as low-to-mid frequency sound absorption.
Sanjay Kumar, H. Lee
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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, Louis 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, Louis C. Sutherland
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Applied Physics Letters, 2020
Acoustic impedance regulation of a neck embedded Helmholtz resonator is realized by introducing surface roughness to the neck so as to convert the initially non-perfect sound absorber to a perfect sound absorber.
Mingyu Duan +4 more
semanticscholar +1 more source
Acoustic impedance regulation of a neck embedded Helmholtz resonator is realized by introducing surface roughness to the neck so as to convert the initially non-perfect sound absorber to a perfect sound absorber.
Mingyu Duan +4 more
semanticscholar +1 more source
Mechanical and Sound Absorption Behavior of Sisal and Palm Fiber Reinforced Hybrid Composites
Journal of Natural Fibers, 2021The present work explores the tensile, flexural, impact strengths and sound absorption behavior of sisal and palm fiber-reinforced hybrid composites. The sisal and palm fibers were reinforced with epoxy resin through a compression molding technique to ...
N. Dhandapani, A. Megalingam
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