Research On Static Characteristics Of Single-ended Exhaust Static Pressure Radial Gas Bearings

The liquid lubricated bearing has the advantages of large bearing capacity,high rigidity and stable operation.However,with the development of science and technology and society,the liquid-lubricated bearings show great deficiencies in the use process,such as low speed,low running accuracy,oil leakage and volatilization pollution of the environment.In the fields of high-speed support,low-friction and low-power support,etc.liquid-lubricated bearings are simply not competent.Gas bearings have the advantages of high speed,high running accuracy,and no friction and wear,so they are widely used in aerospace,space technology,high precision and high precision.The research on static pressure radial gas bearings by domestic and foreign scholars is mostly based on the fixed position of the air inlet.However,in some special cases,the gas can only be discharged from one end of the bearing,and there are very few related researches.This paper takes the single-end exhaust static pressure radial gas bearing as the research object,and uses the computational fluid dynamics analysis software Fluent to carry out numerical simulation of the gas film flow domain.By analyzing the static characteristics of the bearing,the influence law of each influencing factor on the static characteristics of the single-ended exhaust static pressure radial gas bearing is obtained.The main work of this paper is as follows:(1)The structural design of the single-end exhaust static pressure radial gas bearing is carried out,the three-dimensional model of the gas film flow field is constructed by using Solid Works software,and the structure of the gas film flow field is carried out by ICEM CFD software.Mesh division,using the computational fluid dynamics analysis software Fluent to simulate and compare the differences in static characteristics of single-end exhaust and doubleend exhaust static pressure radial gas bearings under the same bearing parameters.(2)Calculate the static characteristics of the bearing by changing the position of the bearing inlet hole,eccentricity,average air film thickness,air supply pressure,speed and other factors,and summarize and summarize the influence of the change of the value of each factor on the static characteristics,the influence law of each influencing factor on the bearing capacity of the single-ended exhaust static pressure radial gas bearing,the steady-state gas film stiffness,and the gas mass flow at the inlet and outlet is obtained.(3)In order to obtain the best performance combination of bearing design indicators,an orthogonal test design is carried out for the single-end exhaust static pressure radial gas bearing.Through the range analysis of the orthogonal test results,it is concluded which of the factors affecting the bearing capacity of the single-ended exhaust static pressure radial gas bearing,the steady-state gas film stiffness and the gas mass flow at the outlet is the main influencing factor and which is the secondary one.Influencing factors,the primary and secondary order of the influence of each factor on the index,and which of the levels of each influencing factor is the optimal level,and a group of optimal combinations within the experimental range is obtained.At the same time,take the factor level as the abscissa and the test index as the ordinate to draw the trend graph of the factor level and the test index.From the trend graph,we can see the trend of the test index changing with the change of the factor level,which can point out the direction for further research.(4)Carry out variance analysis and significance test on the orthogonal test results,and obtain the significant influence degree of each factor on bearing capacity,steady-state gas film stiffness,and gas mass flow.Finally,the correctness of the optimal level and optimal combination determined by the orthogonal test results is verified by simulation.The research results of this paper enrich the design and research methods of single-end exhaust static pressure radial gas bearings,and can provide some reference and guidance for the design of new single-end exhaust static pressure radial gas bearings in the future.Technical personnel have reference value.