The thesis project originates from the need to evaluate the working principles and to validate an existing numerical model, developed in a multibody dynamics environment, which can simulate the ride comfort as perceived by customers on board of passenger cars and possibly commercial vehicles.?? Such model represents the interaction of the vehicle-seat-passenger system and has been developed by CRF. This model aims to incorporate in vehicle simulation the characteristics of seats (viscoelastic characteristic that varies with different models) and human response (nonlinear, depending on a high number of variables).?? The final goal of the activity performed by the candidate is then summarized as: •??Learn the definition of the numerical model and how it is implemented in the multibody analysis software •??Verify that input parameters can be effectively tuned in order to correlate the simulation result with the real phenomenon •??Correlate and validate the model on a series of experimental measurements, taken on different test tracks.