| As an essential transmission component, bearing is expected to have long service life, higher rotating speed and optimized structure design. Rolling bearing and sliding bearing are widely used in bearing support systems for their respective advantages and they are applicable under different working conditions. Generally, they are used separatedly to support the rotors, in this paper a distribution design paralleled to the axis is presented to support rotor system togather so as to make the best use of the advantages and bypass the disadvantages and meer all performance requirements.In order to prolong bearing life and increase loading capacity, parallel hybrid bearing supporting system is proposed. Firstly, rolling bearing loading and deforming characteristics under external loading are studied based on Hertz elastic contact theory, stiffness and friction torque of bearings are analyzed to model the rolling bearing performances. Secondly, based on hydrodynamic lubrication theory, flow field boundary conditions are added to Navier-Stokes equations and fluid continuous equation. Reynolds equations of sliding bearing film pressure field are derived, and then bearing static and dynamic parameters such as oil film bearing capacity, friction torque, stiffness and damping are caculated to decribe the sliding bearing mathamatically. Finally, further study on how parallel hybrid bearing supporting system works is presented based on rolling bearing and sliding bearing analysis. Caculation formulas of its static and dynamic performance characteristics, as well as longevity are derived.Performace characteristics of parallel hybrid bearing supporting system are simulated via MATLAB software. Comparing independent rolling or sliding bearings, parallel hybrid bearing has better performances. It can be concluded that performace parameters such as longevity, loading capacity, stiffness and damping are greatly improved, proving the superiority of parallel hybrid bearing supporting system.
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