Dynamic analysis of the set rotor-bearings of a small power turbojet

Turbojet rotors operate at high angular speeds and undergo intense dynamic loads in operation. Therefore, it is important to evaluate the dynamic behavior of this type of system still in the design phase. In this work, the transverse vibrations of a rotor-bearing assembly of a low-powered aeronautical turbine are analyzed using a finite element model that considers the shaft as flexible and the various compressor and turbine discs as point masses. The influence of the speed of rotation on the variation in the stiffness of the rolling bearings as well as on the damping of the squeeze film dampers is taken into account. Classic results of rotor dynamics (unbalance response, Campbell diagram, bearing efforts) are obtained. The work was carried out in routines developed using numerical computing software.