The purpose of this thesis is the assessment of a comparison between a flexible spacecraft model, studied during previous theses and scientific articles, and the implementation of the same spacecraft in the software MSC Adams, aiming at validating the model. Thanks to this innovative tool it is possible to evaluate several features the user could desire to have available, conducting a non-linear multi-body analysis, that allows to provide more realistic data sets. The Picard satellite of the French Space Agency (CNES) is used as the main body of the spacecraft and its dynamics is expressed with Euler equations for a rigid body.