Theoretical and Experimental Determination of the Sound-Absorbing Property Class of Acoustic Barriers

• Authors: J. Turkiewicz , G. Wszołek
• Languages of publication: EN

Abstracts

EN

The currently applicable PN-EN 1793-1 standard concerning anti-noise devices on roads recommends for acoustic barriers built along traffic routes to have panels characterized by good sound-absorbing properties. The sound-absorbing properties of these panels (wall elements) are to be specified by giving the values of the single-number sound absorption evaluation index DL_α and the absorption property class determined in accordance with the PN-EN 1793-3:2001 standard. Continuous regular acoustic studies of new materials heretofore not used in anti-noise protections are conducted in the Department of Mechanics and Vibroacoustics at AGH. This paper presents the findings of research that started with different porous materials physical absorption coefficient tests. The purpose of these preliminary tests was to pick out materials with best sound-absorbing properties from the group of acoustically tested materials. The chosen materials could be used as a sound-absorbing lining on panels (wall elements) used in the design of acoustic barriers. On the basis of the obtained results, two materials with values of the average physical sound absorption coefficient higher than 0.5 (α_{favg}>0.5) were picked out for further acoustic tests. This paper presents results of studies that had the final effect consisting in determining the values of the single-number sound absorption evaluation index DL_α and the absorption property class for two prototype panels of an acoustic barrier the sound-absorbing lining of which was made up of materials chosen after preliminary acoustic studies. The determination of sound-absorbing property classes was carried out both theoretically and experimentally. In order to be possible to reduce the costs of acoustic tests in the future, particularly of new materials in regard to which there is a margin of uncertainty of whether their sound-absorbing properties meet expectations, the authors determined sound-absorbing property classes of acoustic barriers theoretically and then compared theoretical results with the results of experimental tests.

Keywords

EN

43.55.Ev   43.50.Gf  

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 125
• Issue: 4A
• Pages: A-127-A-130

Dates

published

2014-04

References

• [1] PN-EN 1793-1:2001 - Anti-noise devices on roadways and motorways. Testing method for determination of acoustic properties. Part 1: Specific sound absorption curve
• [2] PN-EN 1793-3:2001 - Anti-noise devices on roadways and motorways. Testing method for determination of acoustic properties. Part 3: Normalized roadway noise spectrum
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• [11] K.U. Ingard, Notes on sound absorption technology, Noise Control Foundation, Poughkeepsie, New York 1994
• [12] J. Turkiewicz, Technical Magazine (Mechanics) 11-M, 105 (2007)
• [13] W.Bartnik, G. Wszołek, in: Proc. XX Conf. Acoust. Biomed. Eng. 2013, Kraków - Zakopane 2013, PTA, Kraków 2013, p. 152, (in Polish)

Identifiers

DOI

10.12693/APhysPolA.125.A-127