Measuring Sabine Absorption values

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Measuring Sabine Absorption values

Postby Eric.Desart » Mon May 02, 2005 2:51 pm

AN ANALYSIS OF SOUND ABSORBING LININGS FOR THE INTERIOR [link found by notallthere]

A theoretical analysis of sound absorption + absorption of several OC materials including 701-703
http://ntrs.nasa.gov/archive/nasa/casi. ... 003624.pdf


Acoustics Encyclopedia
Acoustics Tutorial

Measurement of Sound Absorption
Using a reverberation chamber, the sound absorption is computed as the difference of the Sabine absorption with and without the object under test present in the reverberation chamber.
Extensive procedure description Measuring Sound Absorption

edge effect
Definition of the Edge effect aka diffraction
Definition:
Also known as diffraction effect. The apparent boost in sound absorption coefficient that comes about due to wave diffraction at the edges of the specimen. The specimen appears to be larger than its plan area by a perimeter stripe with width proportional to lambda, where aS is the sound absorption coefficient that would result from testing an infinite area. The effect increases with decreasing frequency, decreasing specimen size, increasing aspect ratio, and increasing sound absorption coefficient. Although the effect is most noticeable when values exceed 1.00, most low-frequency results for highly absorptive specimens are affected to some degree.

Measurement of Sound Transmission Loss
Extensive procedure description Measuring Sound Absorption
Sound Transmission Loss of a specimen conducted in a pair of reverberation chambers. The sound transmission loss is 10 times the logarithm of the reciprocal of the ratio of the energy transmitted through the specimen to the energy incident on the specimen.
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