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Flow Field Numerical Simulation and Performance Analysis for the Conical Hydrostatic Bearing

Author: ChangCuiPing
Tutor: WangChengMin
School: Harbin Institute of Technology
Course: Fluid Machinery and Engineering
Keywords: Conical hydrostatic bearing Cone semi-angle Oil film stiffness Carrying coefficient
CLC: TH133.36
Type: Master's thesis
Year: 2008
Downloads: 132
Quote: 1
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Abstract

The conical hydrostatic bearing is a radial-thrust hybrid bearing. The specialties of this kind of bearing are they can carry radial and axial load at the same time. Compared with the cylindrical and disc hydrostatic bearing, the conical hydrostatic bearing has smaller size, simple structure, less consumption on friction, and lower temperature rise. The thrust force is less affected by the centrifugal force. The conical hydrostatic bearing has nice manufacturability, and easily to get the mixed characteristics of hybrid bearing. Because of it is bright future and high use value this kind of hydrostatic bearing could be serialized. So, they are applied both in low speed heavy load machine and high speed high precision machine, Therefore the property analysis and structure optimization seem particularly important for the conical hydrostatic bearing.In order to simulate the fluid fields of conical gap. First we applied 3D modeling software ----UG, to found the gap’s model. And then put into gambit to grid the model. At last we use the CFD principle of FLUENT to calculate. Choose laminar model, incompressible fluid, segregated solver, implicit formulation, steady model. And analysis the results use the post processor.Though simulate different conical hydrostatic bearing which in different oil film thickness different cone semi-angle eccentric and non-eccentric model. Get the pressure distribution velocity distribution temperature distribution of the oil in conical bearing, make out the change curve follow the bearing parameters, such as the axial stiffness, the radial stiffness, the ratio of axial force and radial force, mass flow, temperature rise, friction and so on. From this simulation can receive follow conclusions: 1. The radial force has a small influence on the axial capacity of the conical hydrostatic bearing. 2. Axial capacity and axial oil stiffness augmented as its rotation speed increased, the effect of hybrid is obvious. 3. Through the simulation of the temperature field make out the relationship of rotate velocity, cone semi-angle and temperature rise, provide the theory basis for the design of conical hydrostatic bearing and make certain its rotation speed. 4. The cone semi-angle has little effect on the radial capacity coefficient, but the offset has heavy influence on it. These conclusions provide the theory basis for the conical hydrostatic bearing design and type selection. Meet the stiffness as a precondition, it also provides the theory basis for decreasing the power consumption and temperature rise of conical hydrostatic bearing.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical parts and gear > Moving parts > Bearing > Hydrostatic bearing
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