Numerical Compensation of Air Absorption of Sound in Scale Model Measurements

The absorption of sound in air represents one of the main problems of the scale model measurements. This absorption, especially at higher frequencies, is considerably greater than the value determined by the law of acoustical similarity between the full scale and the scale model. Different alternati...

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Bibliographic Details
Published in:Archives of acoustics 2012-06, Vol.37 (2), p.219-225
Main Authors: Ciric, Dejan, Pantic, Aleksandar
Format: Article
Language:English
Subjects:
acoustic measurement
Acoustics
air absorption
Background noise
Compensation
Decay
Impulse response
numerical compensation
scale model
Scale models
Similarity
Sound
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Summary:The absorption of sound in air represents one of the main problems of the scale model measurements. This absorption, especially at higher frequencies, is considerably greater than the value determined by the law of acoustical similarity between the full scale and the scale model. Different alternatives are applied for compensation of the excess air absorption including a numerical compensation. In this paper, a modified approach to numerical compensation is proposed. It is based on compensation of the sound decay only, and not background noise. As a consequence, there is no an increase of background noise in the compensated impulse response. The results obtained by the proposed procedure are compared to the corresponding ones obtained by the other procedures.
ISSN:0137-5075
2300-262X
DOI:10.2478/v10168-012-0029-0