This work deals with a mixed experimental numerical method for linear viscoelastic material parameter identification. These parameters are complex and frequency dependent. Identication is performed using a direct and non parametric approach. In this goal, two identification methods adapted to frequency response fields measurements treatment are presented. These datas are durectly exploited, without any experimental modal analysis. Experimental fields are obtained using a vibrometer and numerical ones with finite element method. A brick element dedicated to thin/thick structures analysis is employed. Appications are performed using simple plates or sandwich plates. Results are also compared to DMA measurements and identified modal parameters.
