Lubrication Model and Dynamic Characteristics of Distributed Liquid Film for Hydrodynamic Bearing

Abstract

For the thin film lubrication, boundary lubrication, and local dry friction lubrication state of hydrodynamic bearing, a lubrication model of distributed liquid film is established in this paper which is designed to service for calculating or predicting the full life cycle design performance of water-lubricated bearing. The limitations of the fluid-solid-thermal coupling model for describing the distributed liquid film are investigated. Two new methods to build the lubrication model of distributed liquid film are given. The first one takes fluid-solid-thermal model that can guide the design of bearings parameters as dominant factor, and combines with wear, corrosion, two-phase of gas-liquid and other additional factors. A comprehensive model integrating simulation and mechanism can be built. Through researching the regional properties or distributed parameter of water film and solid interface, the second way proposes a decomposition and synthesis modeling method of water film and rubber. A distributed parameters model of dynamic characteristics for water-lubricated bearing is built. The lubrication theory of distributed liquid film proposed in this paper is appropriate for the situation when the film thickness is less than 10μm or contact. When the film thickness is greater than 10μm, classical lubrication theory is applicable.

Study on Clearance-Rubbing Dynamic Behavior of 2-DOF Supporting System of Magnetic-Liquid Double Suspension Bearing

“…The active electromagnetic bearing (AMB) has many defects, such as the insufficient electromagnetic attraction caused by the magnetic pole magnetic saturation, the higher temperature rise in the magnetic pole/coil caused by the copper loss and the eddy current loss [1,2] (the faults of AMB are shown as Figure 1), the bearing characteristics of operation stability of AMB can be limited, and then it becomes "technical bottleneck", which restricts the further development and application promotion of AMB [3,4]. The hydrostatic bearing concept is introduced into AMB to form the novel suspension bearing-Magnetic-Liquid Double Suspension Bearing (MLDSB) [5].…”