6. Four-degree-of-freedom rotor model

Bearings and thrust bearings, previously described as isolated components, must be integrated into the rotor design of the rotating machine. The rotor can behave either as a rigid solid or as an elastic beam. If the rotor's first natural pulsation is greater than the maximum rotational speed, the rotor can be considered as a rigid beam guided in rotation by two bearings and stopped in translation by a stop (figure 38 ). The rotor is loaded by its own weight Mg, to which may be added a maneuvering load, and/or by one or more external force torsors { F _extX , F _extY , M _extX , M _extY }. The external torsor can be static (from forces...