POROUS MATERIAL PARAMETERS INFLUENCING THE ACOUSTIC PERFORMANCES OF BUILDING CONSTRUCTION SYSTEMS

摘要

The porous materials omnipresent in the construction domain through materials such as mineral, animal, vegetal wools or open cells foams are used for their thermal performances as well as their acoustic ones. As function of their purpose - improvement of airborne sound insulation, improvement of impact sound insulation, acoustic correction - the characteristics impacting the overall performances are different. The aim of this paper is to identify the porous material parameters mostly influencing the acoustic performances of the system they are incorporated in. For each phenomenon considered (airborne sound insulation R, impact noise level L_n, sound absorption coefficient a), different construction systems (partition wall, flocked system,...) are studied. In a first step, the acoustic performances predicted using a Transfer Matrix Method (TMM) are compared with laboratory measurements. In a second step, the contribution of the parameters of the generalized Biot-Allard model of porous materials to the acoustic performances is assessed through parametric studies and design of experiments.