Dynamic Characteristics of a Rigid Spindle Supported by Water-Lubricated Bearings

In this paper, a rigid spindle supported by two identical water-lubricated journal bearings is proposed. The dynamic equations of motion are presented to predicate the performance of the spindle. Under the assumption of linearity, the responses of the rotor excited by constant external force and unbalance force are comprehensively discussed by the fourth Runge-Kutta method. To analyze the static and dynamic characteristics of the water-lubricated bearings, the bulk flow turbulent theory is used and numerically solved by finite difference method. Results of this investigation contribute a better understanding of the performance of a water-lubricated bearing-rotor system.