Porous liners are widely used as vibration and acoustics isolation materials due to their high absorbing qualities in a wide frequency range. In a car body porous plates are laid on top of a metal structure to prevent vibroacoustic wave propagation inside the passenger cabin. Unfortunately, currently used FEM (finite element method) simulation models for poroelasticity Biot's equations are still unable to efficiently describe such coupled structure-liner-fluid systems due to the lack of modelling precision. The current paper focuses on the importance of the phenomena taking place on the structure-liner interface during dynamic excitations in the frequency range of 10-1000 Hz. Measurements of transfer functions for numerous foam samples with varying boundary conditions have been conducted in a vacuum chamber to estimate the effect of interface conditions. New simulation approaches are presented to account for the observed phenomena. Moreover, the issues of measurement uncertainties regarding foam material parameters (or Biot parameters) and poor measurement reproducibility have been addressed and corresponding parameter optimization schemes have been implemented. As a result, a significant improvement in the agreement between simulation and measurement results has been achieved. All simulations have been conducted in a custom FEM code based on the open-source Deal II library.