Acoustic performances of resilient layers for impact sound insulation in standard laboratory

a concrete floating slab. The impact sound insulation can be evaluated on the basis of EN 12354-2 standard models, in which the values of ∆L or ΔLW provided by the floating floor can be measured in laboratory on a reference floor or calculated from the dynamic stiffness of the resilient layer: the latter value is obtained from the resonant frequency of the mass spring system by using a specific test rig. In the present work, starting with the experience gained so far by the acoustics laboratory at the University of Bologna and at the Acoustical Laboratories of INRIM in Turin, a comparison of the values of the attenuation level of different resilient materials are presented calculated using the values of dynamic stiffness determined in accordance with the EN 29052 - 1 and those measured experimentally in room acoustics, according to ISO 10140 series requirements. The aim of the authors is to assess the equivalence of the two methods and to compare repeatability and invariability of the dynamic stiffness values with force-load.