Sound insulation prediction model for simple and multilayer panel

Abstract

Airborne acoustic insulation prediction models allow to evaluate the sound transmission loss of construction solutions in buildings. Among the different building materials used in constructions, homogeneous and isotropic materials of various thicknesses, such as concrete and glass, are commonplace. Due to the limitations of simple panels made from materials of standard thickness, in order to increase the acoustic insulation it is necessary to add various layers of the same or different materials. This research presents a model based on several approximations depending on the frequency range and comprises multi-layer panels joined together using “spot” techniques, such as by screws or nails. The model performance is evaluated with a comparison between predictions obtained using the commercial software INSUL and the model proposed by the authors. The predicted values are also compared with laboratory measurements obtained according to ISO 140-3. This research considers panels grouped into two categories of materials: light and heavyweight materials. The transmission loss in third octave bands, the weighted sound reduction indices and the spectral adaptation terms Rw (C,Ctr) are examined. Statistically, the results show that the proposed model agrees well with real measurements, both for single and multi-layer panels.

Keywords

• aislamiento acústico
• modelo predicción
• panel multicapa