Abstract
The application of magnetic bearings has significant advantages to centrifugal compressors, such as improving operating speed, ameliorating energy efficiency and reducing noise and vibration. Modal frequency and unbalance response of a maglev centrifugal compressor rotor-bearing system are important index parameters to ensure stable operation of the compressor. Thus, it is inevitable to optimize those parameters when designing compressor structure. In this paper, basing on the basic theories of rotor dynamics, ANSYS is used to analyze vibration mode and unbalance response of a compressor rotor-bearing system. Basic excitation sources caused by impellers in pneumatic section and magnetic bearings’ stiffness parameters are considered when doing rotor dynamics modal simulation. Influences on critical speed of the rotor-bearing system caused by support stiffness of magnetic bearings and impellers aerodynamic force is analyzed during the simulation, by which the rotor modal frequency adjustment method is obtained. Besides, the unbalance response sensitivities of different unbalanced amount at different rotor parts are analyzed. Those simulation results have provided a reference to designing the rotor in long axis system of maglev high-speed centrifugal compressor.
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