静压止推气浮轴承动特性的微扰动法研究

doi:10.3969/j.issn.1000-1093.2016.01.022

兵工学报 ›› 2016, Vol. 37 ›› Issue (1): 150-155.doi: 10.3969/j.issn.1000-1093.2016.01.022

静压止推气浮轴承动特性的微扰动法研究

卢志伟，马方杰，刘波，张君安

(西安工业大学机电工程学院，陕西西安 710032)

收稿日期:2014-11-17 修回日期:2014-11-17 上线日期:2016-03-23
作者简介:卢志伟（1979—），男，讲师，硕士
基金资助:
国家自然科学基金项目（50805112）；陕西省教育厅重点实验室基金项目（15JS043）

Research on Dynamic Characteristics of Aerostatic Thrust Bearings Based on Perturbation Method

LU Zhi-wei, MA Fang-jie, LIU Bo, ZHANG Jun-an

(School of Mechatronic Engineering, Xi’an Technological University, Xi'an 710032, Shaanxi, China)

Received:2014-11-17 Revised:2014-11-17 Online:2016-03-23

摘要/Abstract

摘要： 为了实现对静压气浮轴承的动特性进行研究，提出并设计了一种具有可变截面积均压槽的静压气浮轴承，结合气浮轴承的力学振动模型采用微扰动法建立了气浮轴承动态控制方程，运用有限差分法对气浮轴承动态控制方程进行了数值求解，得到了气浮轴承的动态刚度和阻尼。计算结果表明：当振动较小时静压止推气浮轴承的动态刚度值与静态刚度值相当，在气膜间隙为5.5 μm左右时，气浮轴承的动、静刚度均达到最佳值；在同一供气压力下，随着气浮轴承气膜间隙的增大，其动阻尼呈非线性减小，气膜间隙对气浮轴承动阻尼系数的影响较大。

关键词: 机械学, 气浮轴承, 微扰动, 动刚度, 动阻尼, 有限差分

Abstract: An aerostatic thrust bearing with pressure-equalizing groove with variable sectional area is designed to research the dynamic characteristics of aerostatic thrust bearing. Based on the mechanical vibration model of gas bearings, the dynamic control equations of gas bearings is established by using perturbation method, and the dynamic control equations are sovled to obtain the dynamic stiffness and damping of gas bearings by the finite difference method. The results show that the dynamic and static stiffness values of aerostatic thrust bearings are equal when the vibration is small, and the dynamic and static stiffnesses of gas bearings reach the optimum value when the gas film thickness is about 5.5 μm; the dynamic damping decreases nonlinearly with the increase in gas film thickness at the same air supply pressure, and the gas film thickness greatly affects the dynamic damping coefficients of air bearings.

Key words: mechanics, gas bearing, perturbation, dynamic stiffness, dynamic damping, finite difference

中图分类号:

TH133.36

卢志伟，马方杰，刘波，张君安. 静压止推气浮轴承动特性的微扰动法研究[J]. 兵工学报, 2016, 37(1): 150-155.

LU Zhi-wei, MA Fang-jie, LIU Bo, ZHANG Jun-an. Research on Dynamic Characteristics of Aerostatic Thrust Bearings Based on Perturbation Method[J]. Acta Armamentarii, 2016, 37(1): 150-155.

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静压止推气浮轴承动特性的微扰动法研究

Research on Dynamic Characteristics of Aerostatic Thrust Bearings Based on Perturbation Method

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