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Now a day’s due to competitive market, requirement of light weight and low cost material is need for Genset noise reduction. Polyurethane foams (PU foams) are generally available in various densities and thickness. To attain both acoustical properties sound absorption and sound transmission loss, it is required to develop composite PU foam for noise reduction in Genset and other application. In this paper effect of variation in density and thickness on airflow resistivity, sound absorption, sound transmission loss and thereafter on sound insertion loss of material is studied. Also intrinsic properties of various PU foam samples evaluated in terms of flow resistivity, porosity, tortuosity, Viscous characteristic length and thermal characteristic length. The parametric study were carried out of different PU foam composite configuration to achieve desired sound absorption and transmission loss values using simulation software. Finally the optimum design of PU foam composite materials manufactured and bigger samples prepared. The acoustical properties such as sound absorption coefficient and sound transmission loss evaluated as per ISO 354 /ASTM C 423 and ISO 10140-2/ ASTM E 90 respectively in reverberation chamber. Good correlation observed between predicted and experimental results.
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