Results 211 to 220 of about 13,963 (253)
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Sound Absorption Coefficients and Acoustic Impedance
The Journal of the Acoustical Society of America, 1941The relation between normal acoustic impedance and the various types of absorption coefficient has been discussed and specific formulas for the coefficients in terms of acoustic impedance have been published. Contours of constant absorption coefficient plotted as a function of the real and imaginary parts of acoustic impedance plotted on a linear scale
Richard L. Brown, Philip M. Morse
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Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method
2008+12 more sources
Measurement uncertainty of the sound absorption coefficient
The Journal of the Acoustical Society of America, 2008The standard ISO/IEC 17025:2005 on the competence of testing and calibration laboratories requires that these laboratories shall apply procedures for estimating the uncertainty of their measurement results. One of the possibility is to evaluate the budget of uncertainty, taking into account all components that contribute significant uncertainty to the ...
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Reverberation Measurements of Sound Absorption Coefficients
The Journal of the Acoustical Society of America, 1934A comparison is made of the results of the measurement of the absorption coefficients of twenty-five commercial materials by the organ pipe and ear method with the results obtained by measuring the rates of decay by electrical means. A consistent variation in these results is shown, which can be explained by assuming a slight departure from linearity ...
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Absorption of sound and kinetic coefficients of elastic bodies
Annals of Physics, 1992zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Garanin, D. A., Lutovinov, V. S.
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The Automation of Sound Absorption Coefficient Measurement
2009By manual method, the sound absorption coefficient measurement should be done by utilizing many type of equipment such as: measuring amplifier, level recorder, band-pass filter, protactor, etc. However it caused inefficient and need longer time in processing measurement data, therefore the automation system of sound absorption coefficient has been ...
Hermawanto, Denny, Suwandi, Achmad
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The Measurement of Sound Absorption Coefficients by the Reverberation Method
The Journal of the Acoustical Society of America, 1929The paper reports the results of an experimental study of the Reverberation Method. The assumptions made in the Reverberation Theory are critically examined. The fundamental equation at1 = 9.2Vv log10 4Eaı̣v affords two independent means of measuring the change produced in the quantity a for a given room, using a source whose acoustic power may be ...
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Field testing of sound absorption coefficients in a classroom
The Journal of the Acoustical Society of America, 2005Formal procedures for determining the sound absorption coefficients of materials installed in the field do not exist. However, the U.S. Air Force requested such tests to prove that the sound-absorbing material used in classrooms at Beale AFB in Marysville, CA, met the specified NRC of 0.80. They permitted the use of two layers of 0.5-in.
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The Tube Method of Measuring Sound Absorption Coefficients
The Journal of the Acoustical Society of America, 1929The general principles underlying the tube method of measuring sound absorption can be derived conveniently from the analogous equations for the electrical transmission line. These equations show that the actual method of measurement is capable of many modifications, some of which have already been adopted by various experimenters. However, if reliable
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A review on polymer-based materials for underwater sound absorption
Polymer Testing, 2021Imrana Kabir +2 more
exaly