Abstract
The rotordynamic coefficients of fixed-pad thrust bearing are introduced and calculated by using the out-domain method, and a general analysis method is developed to investigate the coupled dynamics of a rotor equipped with journal and thrust bearings simultaneously. Considerations include the effects of static tilt parameters of the rotor on rotordynamic coefficients of thrust bearing and the action of thrust bearing on system dynamics. It is shown that thrust bearing changes the load distribution of journal bearings and the static deflection of the rotor and delays the instability of the system considerably in lateral shaft vibration.
Highlights
Hydrodynamic thrust bearings are used in rotating machinery to support the axial load, and to suppress various forces acting in the axial direction
A general analysis method, in which the coupling action among the rotor, the journal, and thrust bearings is taken into account, was developed
The effects of the thrust bearing were shown in many respects such as the load redistribution and the offset-loaded effects, especially in the static deflection of the rotor, the damped critical speed, and the system stability
Summary
Hydrodynamic thrust bearings are used in rotating machinery to support the axial load, and to suppress various forces acting in the axial direction. The present article focusses on the analysis of the effects of static tilt of the runner on bearing performance and the discussion of coupled dynamics of a rotor system equipped with journal and thrust bearings. When a rotor is supported by journal bearings in a radial direction and thrust bearings in an axial direction, thrust bearings playa significant role on system behavior as important as that of journal bearings They provide oil film forces and moments to the rotor, stiffen or relax the rotor, change both static and dynamic boundary conditions of system, and change the critical speed of the rotor and system stability. As an example ofthe application of this method, static and dynamic behavior of a rotor equipped with journal and thrust bearings are calculated and discussed in detail. Besides Wo, what we pay more attention to is the moment due to the normal pressure Po, with
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