Abstract
Rotordynamics has been a study case area of major interest because many engineering applications have the substrate of elements and phenomena related to rotor dynamics. In the rotor dynamic analysis are used two computting models, one named Jeffcot-Laval rotory type and the other is knowed as the Stodola-Green model type [R1].
This paper work is focused on a presentation of computing elementes and phenomena occurring in rotordynamics. In the practical applications it has been observed that perfect operation considering safety and reliability criteria of a rotor can be obtained at the critical speeds well damped (the rotor in this considered case) if the vibration levels do not exceed allowable limits. Also the stable operation at critical speeds can be obtained if the rotor is not considered with a pronounced sensitivity to mass imbalance. At the level of automotive turbochargers the stable operation at critical speeds can not be obtained because of the high range of rotational speeds and also because the rotor used in this case of applications has a major sensitivity to any imbalance occurring during operation. Current study highlights some aspects regarding in torques accting on the rotor such as: torques applied to the disc, inertia torques due to angular acceleration and also giroscopic torques.
Phenomena related to movement stability includes also issues such as: type of the bearing that supports the rotor in this case it will be considered an elastic type of bearing with damping.