sound absorption coefficient


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sound absorption coefficient

[′sau̇nd ab‚sȯrp·shən ‚kō·i‚fish·ənt]
(acoustics)
The ratio of sound energy absorbed to that arriving at a surface or medium. Also known as acoustic absorption coefficient; acoustic absorptivity.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

sound absorption coefficient,

a The fraction of the sound energy (incident at random angles on a surface) which is absorbed or otherwise not reflected by the surface.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
The normal incidence sound absorption coefficient ([alpha]) is defined by the following equation
(1) Sound absorption coefficient (SAC) of all OPT fiber with an average density of 200 kg/m3 showed minimum value of around 0.60 at frequency range from 3000 - 6400 Hz.
Increased resin lowers friction between the fibers, reducing heat losses and subsequently its sound absorption coefficient.
The effects of [D.sub.t] and [D.sub.f] on the sound absorption coefficient [alpha] are plotted in Figure 19.
The results show that aggregate gradation influences the sound absorption coefficient. The aggregate gradation of 1~3mm has the optimal acoustic absorption effect, followed by 1~5 mm, while the effect of the aggregate gradation of 0~2mm is the most undesirable.
Thus, taking into account the specimens of chopped reeds, the trend towards the incident sound absorption coefficient is similar to that of a reduction in the sound level where efficiency at all frequencies also depends on increased thickness.
A material's sound absorbing properties can be described as a sound absorption coefficient in a particular frequency range.
The sound absorption coefficient was established in accordance with EN ISO 10534-1 using the impedance tube method.
To characterize fabricated foam samples, dillerent cellular (open porosity, average pore size, and cell density), mechanical (yield stress and elastic modulus), and acoustic (sound absorption coefficient and static airflow resistivity) properties were measured.
where the average sound absorption coefficient (a) can be determined from
(2003) carried out experiments in a Kundt's tube, and the following values of sound absorption coefficient of crumb rubber (0.5-1.5 mm in size) were received: at the low-frequency band (100-315 Hz), the average sound absorption coefficient equals to 0.2, whereas according exploratory data, while filling structures of different thickness with finest crumb rubber, the average sound absorption coefficient values are by 15-35% higher (0.23-0.27).
The sound absorption coefficient of the samples, presented in a scale from 0 to I, was measured with an impedance tube and the [Tube-X.sup.[TM]] utility package in accordance with the ASTM E1050 standard.