Exponential Model of Nonlinear Liquid-Film Force of Tilting-Pad Guide Bearing and Its Application

doi:10.7652/xjtuxb201703013

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Exponential Model of Nonlinear Liquid-Film Force of Tilting-Pad Guide Bearing and Its Application

更新时间：2025-07-09

- Exponential Model of Nonlinear Liquid-Film Force of Tilting-Pad Guide Bearing and Its Application
- Vol. 51, Issue 3, Pages: 72-79(2017)
- 作者机构：
  
  西安交通大学现代设计及转子轴承系统教育部重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201703013
  CLC： O322;TH133
- Online First：10 March 2017，
  
  Published：2017
- 稿件说明：
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Exponential Model of Nonlinear Liquid-Film Force of Tilting-Pad Guide Bearing and Its Application[J]. 2017, 51(3): 72-79.
DOI：

Exponential Model of Nonlinear Liquid-Film Force of Tilting-Pad Guide Bearing and Its Application[J]. 2017, 51(3): 72-79. DOI： 10.7652/xjtuxb201703013.

摘要

针对高可靠性立式轴系可倾瓦导轴承的液膜力非线性问题

提出采用8系数8指数模型来综合表征非线性液膜力

同时采用8个函数表达静态平衡点附近局部运动的导轴承刚度和阻尼

指数的大小表征液膜力的非线性强弱。基于指数模型分析了不同静态平衡点和扰动量等运行参数以及支点系数、预负荷系数和间隙比等结构参数变化下的导轴承非线性刚度力指数和非线性刚度系数

提出了基于导轴承结构参数的液膜力非线性弱化原理

并针对核主泵四瓦水润滑导轴承给出了一种实现该原理的支点加弹簧的新型支点结构导轴承。结果表明:液膜力的非线性强弱与工作静态平衡点和扰动量相关

静态平衡点偏心距和扰动量越大

则非线性刚度力指数p

越大

非线性越强

而阻尼力可认为是线性的; 预负荷系数对p

影响较大

而支点系数和间隙比对p

影响较小; 通过支点组件刚度和预负荷系数的耦合调节

可以实现在保持导轴承线性刚度不变的同时降低导轴承液膜力的非线性指数。8系数8指数模型相比数值求解法和解析法能更加直观地反映液膜力的非线性程度。

Abstract

For the investigation of nonlinear liquid-film force of tilting-pad guide bearings in a high reliability vertical rotor-bearing system

a model with eight coefficients and eight exponents is proposed to characterize the nonlinear liquid-film force. Eight functions are used to express the bearing stiffness and damping coefficients when the journal is in a local motion state at the static equilibrium point

and the eight exponents represent the nonlinear strength of liquid-film force. The nonlinear force exponents and nonlinear stiffness coefficients are analyzed with the variation of the operating parameters of static equilibrium

point and disturbance quantity as well as with the variation of structural parameters of pivot coefficient

preload factor and clearance ratio. A nonlinear weakening principle of liquid-film exponents is obtained from the analysis

and a four-pad water lubricated guide bearing for the nuclear main pump is assembled by a new pivot plus spring structure to realize the weakening principle. The results show that the nonlinear strength of the force relates to the static equilibrium point and disturbance quantity

the nonlinear strength of the liquid-film force increases with the nonlinear exponent p

while p

increases with the static eccentricity and disturbance

and the damping force can be considered to be linear. In addition

the preload factor has a greater influence on p

than the pivot coefficient and clearance ratio. Through the coupling adjustment of pivot assembly stiffness and preload factor

the nonlinear exponent of liquid-film force can be reduced while maintaining a constant linear bearing stiffness. The proposed model with eight coefficients and eight exponents is more intuitive to reflect the nonlinear strength of the liquid-film force compared with numerical solution and analytical method.

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references

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