Reliability Improvement of Rotor Supports by Combining Rolling-Element Bearings and Fluid-Film Bearings

Abstract:

Reliability of rotating machinery is determined to a considerable degree by the bearing units. For several applications the requirements in rotation speed, bearing load and maximal vibration level are so extreme that neither rolling-element bearings nor fluid-film bearings could provide necessary performance characteristics during all regimes of operation. Hybrid bearings, which are a combination of rolling-element and fluid-film bearings, can improve performance characteristics and reliability of the rotor-bearing systems. The aim of this work is to analyze the advantages and disadvantages of the hybrid bearings. Known real applications of hybrid bearings are discussed. Analysis shows that depending on the application different hybrid bearing types could improve dynamic characteristics and life time of the bearing unit, increase load capacity and DN limit of the rolling-element bearing.

• Periodical: Applied Mechanics and Materials (Volume 630)
• Pages: 188-198
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.630.188
• Online since: September 2014
• Authors: Roman Polyakov*, Leonid Savin, Denis Shutin
• Keywords: Damping, Hybrid Bearing, Life Time, Load Capacity, Rotordynamics, Stiffness

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