Investigation into the Dynamic Parameter Characterization of Water-Lubricated Bearings Under Vibration Coupling

Abstract

A transient rotor dynamics numerical model is developed to research the effects of operating conditions and critical structural parameters on the variation patterns of the dynamic characteristic coefficients and journal orbit of water-lubricated stern bearings, and the model's accuracy is verified by both simulation and test. The main stiffness and damping formulas for dimensionless bearings are fitted based on numerical results. The results demonstrate that the external load and rotational speed significantly affect the vertical direction's main stiffness and damping coefficients, and the eccentric excitation strongly influences the damping coefficient; the relative error between the calculated values of the dynamic characteristic coefficients of the fitted formulas and the values predicted by the numerical simulation does not exceed 10%.

Keywords: water-lubricated stern bearing, dynamic characteristic coefficients, nonlinear dynamics, vibration coupling