Improvement of airborne sound insulation of lightweight timber framed walls through prefabricated multilayer wood studs
Invited paper
EcoAcoustique SA
Monday 1 june, 2015, 11:00 - 11:20
Auditorium 2 (592)
Abstract:
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.