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International audience; The wide use of porous materials in vibro-acoustics led up to study a novel material that can exhibit interesting behaviours for vibro-acoustics applications, and possibly improve the efficiency of performances. This paper is focused on the analysis of absorbing foams, which are rendered auxetic (Negative Poisson’s ratio) thanks to a specific forming process. It first illustrates the efficiency of auxetic foams compared to melamine samples using experimental results. Then a study is conducted in order to improve the identification of mechanical and coupling modelling parameters for the considered auxetic transverse isotropic foam. The method associates a preliminary parameters sensitivity analysis with an optimization study. A global sensitivity analysis of the outputs of interest is performed using the Fast technique in order to estimate the first-order and total effects of the numerous parameters of the model. The results of the analysis are then used to perform the optimal identification of the parameters by readjusting finite elements analyses results over experimental data. The results and benefits of the preliminary use of parameters sensitivity analysis associated with optimization are finally presented.