An energy model for the acoustic insulation of absorbing materials
Document typeConference report
PublisherSociedad Española de Métodos Numéricos en Ingeniería (SEMNI)
Rights accessOpen Access
In this work an energy model for the acoustic insulation of absorbing ma- terials is shown. This model is an extension of Statistical Energy Analysis (SEA)  in order to account for the effect of non-conservative connections [2, 3]. The energy-based approach allows to solve sound insulation problems in large domains (such as those in building acoustics) in an efficient way for the whole frequency range required by regulations (50-5000 Hz). In particular, this approach is applied here for the study of the insulating behaviour of an absorbing layer (mineral wool) filling the cavity of a double wall. The absorbing layer is considered as a non-conservative connection between the two leaves of the wall. This model is combined with detailed numerical computations to obtain the loss factors associated to the connection. With these parameters, a combined system including the transmission between rooms and double walls can be stated. Obtained results show that absorbing layers can be modelled as non-conservative cou- plings and incorporated in an SEA-like system to compute the sound insulation in buildings successfully.
CitationDíaz-Cereceda, C.; Poblet-Puig, J.; Rodriguez, A. An energy model for the acoustic insulation of absorbing materials. A: Congreso de Métodos Numéricos en Ingeniería. "Congreso de Métodos Numéricos en Ingeniería: CMN 2013 = Congress on Numerical Methods in Engineering: CMN 2013". Bilbao: Sociedad Española de Métodos Numéricos en Ingeniería (SEMNI), 2013, p. 1-13.