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http://dx.doi.org/10.7234/kscm.2012.25.5.154

Effect of Structure on the Sound Absorption and Sound Transmission Loss of Composite Sheet  

Lee, Byung-Chan (한국교통대학교 환경공학과)
Kim, Sung-Ryong (한국교통대학교 나노고분자공학과)
Publication Information
Composites Research / v.25, no.5, 2012 , pp. 154-158 More about this Journal
Abstract
The effect of structure on the sound absorption and sound transmission loss of composite sheet was investigated. A sheet of polypropylene was bonded by hot press with nonwoven fabric sheets of polyethylene terephthalate on the top side and the back side. Absorption coefficient of composite sheet using nonwoven fabric with surface density of $0.64kg/m^2$ was 0.1-0.2. It is 100-400% improvement compare to that of polypropylene sheet. The transmission loss of composite sheet was increased with surface density of polypropylene board and introduction of hemisphere hole on the surface of sheet. Two types of composite sheet were made using flat sheet and sine wave shaped sheet and the effect of sheet structure on the transmission loss was investigated.
Keywords
composite sheets; sound absorption coefficient; transmission loss; impedance tube method; trunk mat;
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