Enhancement of low frequency sound absorption by placing thin plates on surface or between layers of porous materials

Rigid thin plates can be used, either on the surface or between layers of materials, to improve the sound absorption properties of porous materials at low frequencies, especially for materials with low sound absorption. Measurement results obtained from a 100 mm impedance tube, for different combina...

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Veröffentlicht in:The Journal of the Acoustical Society of America 2019-08, Vol.146 (2), p.EL141-EL144
1. Verfasser: Feng, Leping
Format: Artikel
Sprache:eng
Online-Zugang:Volltext
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Zusammenfassung:Rigid thin plates can be used, either on the surface or between layers of materials, to improve the sound absorption properties of porous materials at low frequencies, especially for materials with low sound absorption. Measurement results obtained from a 100 mm impedance tube, for different combinations of porous materials and thin plates, are supplied. Possible physical explanations are discussed. The size of the plate, together with the original properties of the porous material, determines the useful frequency region of the method. The technique of surface-placed thin plates can be directly applied to existing structures without making any changes of the original system, and the results are comparable to those with more complicated modifications.
ISSN:0001-4966
1520-8524
1520-8524
DOI:10.1121/1.5121571