Improvement of airborne sound insulation of lightweight timber framed walls through prefabricated multilayer wood studs

Invited paper

Victor Desarnaulds

EcoAcoustique SA

Monday 1 june, 2015, 11:00 - 11:20

Auditorium 2 (592)

Coupling properties of structures are one of the most important parameters for sound insulation of wooden buildings. Independent double structures or interposition of resilient elements are usually used to reduce coupling between lightweight walls panels. To decrease the cost and assembly time, a multi-layer stud was developed using an ultrasonic process to thermo-glue different types of resilient layers (composite foam, recycled tire, wood wool) between two thin wood studs. The evaluation of the elastic properties from the various multilayers studs was performed by acceleration measurements on small size samples. Measurement uncertainties, impact and accelerometers positions (in or between studs) and the influence of flanking transmissions have been investigated. Based on the average acceleration attenuation between the panels, improvements of the various multilayers studs compared to a single plain wood stud have been characterized according to the resilient type and thickness. Third octave bands results were used to predict airborne sound insulation. The predicted values from optimized studs, obtained with composite foam, were finally compared with the weighted sound reduction index measured in laboratory (without flanking transmission) and in situ (with flanking transmission) on full size samples.

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