Simulation analysis of dynamic coefficients for high-speed water-lubricated bearing-rotor system of satellite

With the development of space technology, the traditional aerospace cooling technology is hard to meet the constantly developing requirements of heat dissipation. In order to address the problem of temperature control for aerospace systems, the pump-driven fluid loop system has been often adopted. In the pump-driven fluid loop system, the rotor system is needed to be analyzed. In this paper, the rotor coupling system of the canned pump with multiple journal bearings has been studied based on the bearing data, lumped parameter method, Reynolds equation and finite element method. By solving the Reynolds equation, parameters of each bearing have been solved, and a database file has been formed. The bearing data have been addressed by linear interpolation. In this study, the static indeterminate problem has been combined to analyze the bearing force, and the bearing characteristic parameters under the steady-state condition have been solved based on the iterative method. The results indicated that the influences of clearance ratio and rotational speed on the natural frequency, critical rotational speed and unbalanced response of the rotor show certain regularity. The study provides a theoretical basis for the stable operation of the whole rotor system.