稀疏度与表面粗糙度对微轴承空气动力润滑的交互作用

Interactive Effects of Rarefaction and Surface Roughness on Aerodynamic Lubrication of Microbearings.

作者信息

Wu Yao, Yang Lihua, Xu Tengfei, Xu Haoliang

机构信息

State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an 710049, China.

Shaanxi Key Laboratory of Environment and Control for Flight Vehicle, Xi'an 710049, China.

出版信息

Micromachines (Basel). 2019 Feb 25;10(2):155. doi: 10.3390/mi10020155.

DOI:10.3390/mi10020155

PMID:30823552

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6412351/

Abstract

The aerodynamic lubrication performance of gas microbearing has a particularly critical impact on the stability of the bearing-rotor system in micromachines. Based on the Duwensee's slip correction model and the fractal geometry theory, the interactive effects of gas rarefaction and surface roughness on the static and dynamic characteristics were investigated under various operation conditions and structure parameters. The modified Reynolds equation, which governs the gas film pressure distribution in rough bearing, is solved by employing the partial derivative method. The results show that high values of the eccentricity ratio and bearing number tend to increase the principal stiffness coefficients significantly, and the fractal roughness surface considerably affects the ultra-thin film damping characteristics compared to smooth surface bearing.

摘要

气体微轴承的气动润滑性能对微机械中轴承-转子系统的稳定性有着尤为关键的影响。基于杜温西的滑移修正模型和分形几何理论，研究了在各种运行条件和结构参数下气体稀薄效应和表面粗糙度对静态和动态特性的交互作用。采用偏导数法求解了用于控制粗糙轴承中气膜压力分布的修正雷诺方程。结果表明，偏心率和轴承数的高值往往会显著提高主刚度系数，与光滑表面轴承相比，分形粗糙表面对超薄膜阻尼特性有相当大的影响。