Methods of Parametric Modeling and Simulation Numerical Analysis of Rotor Dynamics in Active Magnetic Bearings on Example of the Turbocompressor

The article includes the comparison of two methods of modeling and evaluating the dynamics of rotors in active magnetic bearings (AMBs). An analysis of the dynamics of the rotor of the turbocompressor of the gas-pumping unit is considered, taking into account AMBs which are used as systems for control of motion stability. Two different methods of modeling were used to simulate the rotor dynamics of the rotor-AMBs system: the first is solid modeling which takes into account the deformability of the hinged elements of the rotor and its effect on its natural frequencies and critical speeds and the second is mass modeling where all hinged elements are replaced by mass-inertial elements. Both approaches are based on the application of finite element methods. The work aims to identify the advantages and disadvantages of using different methods for modeling and calculating rotordynamics characteristics of rotors supported by AMBs. The identification is based on various static and dynamic analyses. The results of numerical experiments are presented in the form of calculations of critical speeds and modes of oscillation (precession). This makes it possible to judge the possibility of the resonance regimes of the system and prevent dangerous situations. Obtained results indicate the accuracy and adequacy of results generated using different methods. The results could be used to determine the applicability of certain approaches depending on the specific needs of an engineer or researcher.