Dynamic characteristics of opposed-conical gas-dynamic bearings
Industrial Lubrication and Tribology
ISSN: 0036-8792
Article publication date: 4 October 2019
Issue publication date: 6 April 2020
Abstract
Purpose
The purpose of this paper is to investigate dynamic characteristics of opposed-conical gas-dynamic bearings considering five degree-of-freedom motion, including translation and tilt.
Design/methodology/approach
The steady-state Reynolds equation and perturbed Reynolds equations are solved on the surface of conical bearings, and both stiffness and damping coefficients are calculated. A formula for quickly calculating critical mass is deduced to discriminate the stability of the rotor considering the five degree-of-freedom motion.
Findings
Results show that the stability of the rotor is mainly determined by translation rather than tilt. The formula of critical mass is validated by comparing the results with traditional Routh–Hurwitz criterion.
Originality/value
The formula proposed in this paper greatly simplifies the solution of critical mass, which facilitates the rotor stability design. It is applicable for opposed-conical bearings, opposed-hemispherical bearings and spherical bearings. The results provide theoretical guidance for the design of gas-dynamic bearings.
Keywords
Acknowledgements
This study was funded by the National Natural Science Foundation of China (Grant Number 51776087), the National Key Research and Development Program of China (Grand Number 2017YFC0404201), the Aeronautical Science Foundation of China (Grant Number 20150863003), 333Project of Jiangsu Province (Grant No. 2016III-2731) and Six Talent Peaks Project in Jiangsu Province (Grant No. HYGC-008).
Citation
Li, Y., Zhang, D. and Duan, F. (2020), "Dynamic characteristics of opposed-conical gas-dynamic bearings", Industrial Lubrication and Tribology, Vol. 72 No. 3, pp. 415-425. https://doi.org/10.1108/ILT-07-2019-0264
Publisher
:Emerald Publishing Limited
Copyright © 2019, Emerald Publishing Limited