Analysis on dynamic characteristics of the ultra-thin gas film lubrication in cylindrical gas journal bearing

被引：0
作者：
Wu Y. [1 ]
Yang L.-H. [1 ,2 ,3 ]
Xu T.-F. [1 ]
Xu H.-L. [1 ]
机构：
[1] The School of Aerospace, Xi'an Jiaotong University, Xi'an
[2] Shaanxi Key Laboratory of Environment and Control for Flight Vehicle, Xi'an
[3] State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an
来源：
Zhendong Gongcheng Xuebao/Journal of Vibration Engineering | 2019年 / 32卷 / 05期
关键词：
Aerodynamic bearing; Dynamic characteristics; Dynamic Reynolds equation; Radius clearance; Ultra-thin gas film lubrication;
D O I：
10.16385/j.cnki.issn.1004-4523.2019.05.019
中图分类号：
学科分类号：
摘要：
In micro-nano-scale, the gas-film thickness of aerodynamic gas-lubricated bearings is close to the mean free-path of gaseous molecules. The gas rarefied effect is a key influence factor to the dynamic performance of self-acting gas bearings. In this paper, the dynamic gas film pressure and film thickness are expressed as the complex form with periodic disturbance of the journal. The dynamic Reynolds equation for the ultra-thin film lubrication is solved in virtue of the toolbox of partial derivative equation (PDE) of MATLAB. Then the dynamic stiffness and dynamic damping coefficients of hydrodynamic gas bearings can be obtained. The effects of different radius clearance, the modified models of gas rarefied effect and different bearing parameters on the dynamic characteristic coefficients of gas bearings are analyzed. The results show that the dynamic stiffness coefficient of aerodynamic journal bearings is significantly reduced and the dynamic damping coefficient is increased as the increase of gas rarefied effect and decrease of radius clearance. Moreover, the parameter of the aerodynamic pressured bearing has a little influence on the dynamic characteristics when the radium of clearances is reduced to nanometer scale. © 2019, Nanjing Univ. of Aeronautics an Astronautics. All right reserved.
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页码：908 / 917
页数：9
相关论文
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