弹性波箔型动压气体径向轴承的特性分析和实验研究

发布时间：2018-03-28 01:10

本文选题：波箔　切入点：气体轴承　出处：《南京航空航天大学》2012年硕士论文

【摘要】：波箔轴承主要由平箔、波箔和轴承壳体组成，它是一种以柔性表面为支承的自作用式流体动压轴承，与传统的气体轴承相比，波箔轴承具有运行寿命长、可靠性高、承载能力大，，耐高温能力强以及高转速等特点。本文以Hydresil型波箔动压气体轴承为研究对象。采用壳模型计算波箔的刚度，用有限差分法、牛顿-拉普森迭代法耦合求解压力控制Reynolds方程和气膜厚度方程，分析转速以及偏心率对轴承承载能力、偏位角、摩擦转矩等静态特性的影响。采用小扰动法，将压力、气膜厚度和箔片径向变形分别在平衡位置以位移和速度扰动微量按泰勒级数展开，代入雷诺方程归类整理出关于压力和气膜厚度扰动微量的微分方程，再通过箔片变形与膜厚变化的关系以及压力与箔片变形的平衡关系，建立压力和膜厚扰动微量的其他关系表达式，求解关于扰动微量的方程，计算轴承的动态特性系数，并讨论偏心率、转速和扰动频率对动特性系数的影响。考虑气膜与平箔之间的热传导和轴颈的温度变化，而忽略波箔、轴承基座等的热传导，并考虑润滑气体的粘温关系，建立关于润滑气体的简化了的三维传热模型，通过离散气膜的能量方程，计算气膜的温度分布。实验方面，设计制作了箔片成型夹持装置以及摩擦力矩的测量装置，搭建了专门的弹性箔片动压气体轴承实验台，包括实验台本体、润滑冷却系统和测量系统。以铍青铜为材料，采用专用模具加工制作平箔和波箔，并装配波箔轴承。对实验台的振动特性进行了测试及调试，测量波箔轴承的径向位移、摩擦力矩以及气膜的温度场分布。
[Abstract]:Wave foil bearing is mainly composed of flat foil, wave foil and bearing shell. It is a self-acting hydrodynamic bearing supported on flexible surface. Compared with traditional gas bearing, wave foil bearing has long service life and high reliability. High bearing capacity, high temperature resistance and high speed. In this paper, the dynamic pressure gas bearing of Hydresil type wave foil is studied. The shell model is used to calculate the stiffness of the foil. The finite difference method and Newton-Raphson iterative method are used to solve the pressure control Reynolds equation and the gas film thickness equation. The effects of rotational speed and eccentricity on bearing bearing capacity, offset angle, friction torque and other static characteristics are analyzed. The film thickness and the radial deformation of the foil are expanded according to Taylor series by displacement and velocity perturbation at the equilibrium position respectively, and the differential equations about the perturbation of pressure and film thickness are sorted out by the Reynolds equation. Then through the relationship between foil deformation and film thickness change and the balance relationship between pressure and foil deformation, the other relation expressions of pressure and film thickness perturbation trace are established, and the equation of disturbance trace is solved, and the dynamic characteristic coefficient of bearing is calculated. The influence of eccentricity, rotational speed and disturbance frequency on the dynamic characteristic coefficient is discussed. The heat conduction between the film and the flat foil and the temperature change of the journal are considered, while the heat conduction of the wave foil, bearing base, etc., and the viscous temperature relation of the lubricating gas are considered. A simplified three-dimensional heat transfer model for lubricating gas is established. The temperature distribution of the film is calculated by the discrete energy equation of the film. In the aspect of experiment, the foil forming and clamping device and the measuring device of friction torque are designed and manufactured, and a special experimental platform of elastic foil dynamic pressure gas bearing is built, including the body of the test table. Lubricating cooling system and measuring system. Using beryllium bronze as material, the flat foil and wave foil are manufactured by special mould, and the wave foil bearing is assembled. The vibration characteristics of the test stand are tested and debugged, and the radial displacement of the wave foil bearing is measured. Friction moment and temperature field distribution of the film.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH133.3

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