WSEAS Transactions on Acoustics and Music
Print ISSN: 1109-9577
Volume 3, 2016
Methodology to Assess the Relationship Between Acoustic Absorption Coefficient, Thickness and Frequency Response
Authors: , ,
Abstract: Sound absorption coefficient is a commonly used parameter to characterize the acoustic properties of sound absorbing materials that plays an important role in noise attenuation. Commonly, the laboratory experiments stand as basics to determine which thicknesses is more appropriate to be used and on what frequency is obtained the optimum acoustic absorption coefficient. This method is time and money consuming. A more inexpensive method is to use noise simulation, but some adaptations most be performed in order to have a very good accuracy. This paper provides a simple reasonable methodology to assess the relationship between acoustic absorption coefficient, thickness and frequency response. For this study a specific material has been chosen in order to exemplify the methodology and was experimentally evaluated and compared with the simulated results to validate the simulation model. The method used to estimate the sound absorption coefficient is based on transfer function method in accordance with standard SR EN ISO 10354-2. Using simulations, different thicknesses were considered and the acoustic absorption coefficient in relation with the frequency response was assessed, facilitating an easier way to select the proper material thicknesses to design a specific acoustic solution.
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Keywords: material noise reduction, sound absorption coefficient, acoustic FEM, Kundt tube, transfer function, methodology, optimization
Pages: 7-14
WSEAS Transactions on Acoustics and Music, P-ISSN: 1109-9577, Volume 3, 2016, Art. #2