Investigation of Transmission Loss and Absorptioncoefficient of the PU Composite Panels forConstruction Application

This paper presents the experimental work of a passive polyurethane composite panel for the cancelling of sound. The use of an impedance tube to determine transmission loss and ab-sorption coefficient of panels was undertaken and compared with measured field evaluated from the reverberation room method. These panels with different thicknesses have been in-vestigated. Acoustic results were promising, showing absorption coefficients that, were gen-erally higher than ۰.۵ from ۵۰۰ Hz on, and higher than ۰.۶ from ۱ kHz on. Also, the Noise Reduction Coefficient of the samples varies in ۰.۲۳-۰.۴۲ range, depending on the layer thickness, that makes them a good option for insulating application of buildings.

Keywords:

Sound insulation , impedance tube , passive wall systems , Interior noise.