Test on dynamic characteristics of spherical spiral groove aerodynamic-aerostatic gas bearings

被引：0
|
作者：
Jia C. [1 ]
Zhang H. [1 ]
Qiu M. [1 ]
Ma W. [1 ,2 ]
机构：
[1] School of Mechanical and Electrical Engineering, Henan University of Science and Technology, Luoyang, 471003, Henan
[2] Machinery and Equipment Advanced Manufacturing Collaborative Innovation Center in Henan Province, Luoyang, 471003, Henan
来源：
Hangkong Dongli Xuebao/Journal of Aerospace Power | 2019年 / 34卷 / 08期
关键词：
Dynamic characteristic analysis; Gas film vortex and oscillation; Nonlinear stability; Spherical aerodynamic-aerostatic gas bearings; Stiffness and damping coefficient model equation;
D O I：
10.13224/j.cnki.jasp.2019.08.025
中图分类号：
学科分类号：
摘要：
According to the variation law of gas film force when the bearing axis is slightly displaced from the static equilibrium position and entering the displacement change motion, the matrix equation for calculating the gas film stiffness and damping coefficients was established, and the rolling iteration algorithm was used to calculate the gas film transient stiffness and damping coefficients. The vibration characteristics of transient stiffness and damping of gas bearings during the period 1, period 2 and chaotic motion were analysed. The mechanical mechanism of gas film whirl and oscillation was studied to improve the dynamic characteristics of gas bearings, reduce the whirl and oscillation of gas film and improve the stability of gas bearings. Results showed that the operating state of the rotor can be judged by the variation of the stiffness and damping coefficients of the gas film. When the gas film force fluctuated, the stiffness and damping coefficients fluctuated periodically, causing the oscillation of the gas film; when the amplitude of the instantaneous stiffness coefficient fluctuated more than 10 times, the bearing rotor approached the critical instability and enters the chaotic state; when the film stiffness and damping coefficients were distorted, the bearing had a rubbing failure. © 2019, Editorial Department of Journal of Aerospace Power. All right reserved.
引用
收藏
页码：1847 / 1856
页数：9
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