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Linking ISO Dynamic Stiffness and Acoustic Modal Identification for FEM-Oriented Modelling of Elasticized Expanded
Krzysztof Nering1, Konrad Nering2, Ewa Kozak-Jagieła3
1Faculty of Civil Engineering, Cracow University of Technology, 31-155 Cracow, Poland.
Abstract:
Elasticized expanded polystyrene (EPS-T) is widely used as a resilient layer in floating floors, where dynamic stiffness is the key input for impact-sound prediction, while FEM modelling additionally requires elastic parameters and damping descriptions consistent with the adopted test or modelling configuration. This study investigates whether ISO-type dynamic stiffness testing and acoustic-response modal identification can provide consistent vibroacoustic parameters for EPS-T. Rectangular specimens of different thicknesses were tested for dynamic stiffness and damping using an ISO 9052-1-type setup. Additional cylindrical compression tests were used to examine apparent Young's modulus and Poisson's ratio, while impulse-excited acoustic responses of clamped specimens were combined with inverse FEM identification. The ISO-type dynamic stiffness decreased from approximately 53.3 MN/m3 for nominal 17 mm specimens to 27.0 MN/m3 for nominal 53 mm specimens. This trend was described by a compliance model with an effective Young's modulus of 2.04 MPa and an equivalent contact/support stiffness of 101.2 MN/m3. Acoustic-response inverse FEM gave consistent Young's modulus values, ranging from 1.77 MPa to 2.16 MPa, with a mean close to 2.05 MPa. Direct use of s' = E/h overestimated stiffness and underestimated predicted ΔLw by approximately 2-5 dB. The two routes provided consistent estimates of the effective modulus, but this consistency applies only to modulus identification and not to direct stiffness conversion or damping transfer.
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