absorption coefficient

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Related to sound absorption coefficient: Noise Reduction Coefficient
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Synonyms for absorption coefficient

a measure of the rate of decrease in the intensity of electromagnetic radiation (as light) as it passes through a given substance

References in periodicals archive ?
Keywords: Oil Palm Trunk (OPT); Sound Absorption Coefficient ([alpha]); Impedance Tube Method
The properties for the poroelastic model, also termed the Johnson-Champoux-Allard model (Allard and Atalla 2009), are difficult to measure directly and were instead determined from the measured sound absorption coefficient using the ESI Foam-X software (ESI 2014).
i] = Surface area for the ith plenum wall Q = Directivity factor which is equals 2, 4, or 8 depending on whether the opening is at the center of the wall, a bihedral corner, or a trihedral corner respectively d = Slant distance between the inlet and exit [alpha] = Average sound absorption coefficient for the walls [[alpha]S.
The sound absorption coefficient ([alpha]) describes the efficiency of the material or surface to absorb sound energy and can take values in the range 0-1, where 1 represents total absorption and 0 represents total reflection.
2011) has disclosed that an increase in the thickness of specimens shows higher values of the incident sound absorption coefficient at all frequencies and the peak of efficiency occurs at lower frequencies.
Key words: sound absorption coefficient, impedance tube, sound absorber
As natural fibers are inherently coarser than man-made fibers, and much more coarse than fiberglass, our initial expectation was to get much lower sound absorption coefficient values.