Investigation of Transmission Loss and Absorption coefficient of the PU Composite Panels for Construction 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 absorption coefficient of panels was undertaken and compared with measured field evaluated from the reverberation room method. These panels with different thicknesses have been investigated. Acoustic results were promising, showing absorption coefficients that, were generally higher than 0.5 from 500 Hz on, and higher than 0.6 from 1 kHz on. Also, the Noise Reduction Coefficient of the samples varies in 0.23–0.42 range, depending on the layer thickness, that makes them a good option for insulating application of buildings. In this research, firstly, by using methods based on geometrical
acoustics, the collection of required data sets at frequencies of 500 and 2000 Hz is done.
The objective of the current research is to investigate new polymer composites with optimal acoustic properties. To do so, the polyurethane foam is employed as the based polymer and other materials are used as extra ingredients