This thesis deals with the simulation of a roller bearing test rig from which guidelines are derived for its actual implementation. The goal of this thesis is the characterization of the performance of the shaft in terms of tilting, shifting and its natural frequencies. Using the simulation results, the acting hydraulic forces are evaluated in order to define the loading limits of the machine. In the models the bearing clearance, the tilting and the shifting of the shaft is accounted for. This is possible by using bushing joints and by influencing individual degrees of freedom of the model. To accommodate the bearing clearance an additional ring was used to allow a certain amount of free displacement by means of a weak spring element. The geometry was examined and optimized in order to reduce calculation times.The model was validated carrying out measurements on real machines. A good accordance of the measured and calculated values was achieved in the relevant low frequency regime. For higher frequencies the model behaves slightly too stiff as expected from a numerical approximation scheme. Hence, the entire system has been numerically analyzed. Given the hydraulic forces the model enables to determine critical frequencies for certain loading cycles. This information can be used to design specific experimental programs.