表面微织构气体箔片轴承弹流润滑机理及特性研究
发布时间：2018-08-27 18:40
【摘要】：动压气体箔片轴承因具备低摩擦、无污染、回转精度高、自适应性强、寿命长、抗冲击、稳定性好等诸多长处而被广泛研究,尤其适用于高速轻载机械,因此在诸多领域具有广阔的发展和应用前景。但动压气体箔片轴承本身仍存在许多不足,如箔片轴承在启动过程中箔片与轴颈存在摩擦,在转子起飞之前箔片结构易发生磨损破坏等。表面微织构技术为提高箔片轴承刚度与承载力、降低箔片磨损、增加系统阻尼提供了新的途径。但是将表面微织构技术应用于气体箔片轴承尚存诸多科学问题需要探索,如表面微织构提高摩擦学特性的机理尚不明确,表面微织构尺度较小,其流动特征与轴承内大尺度流动特征有所不同等。针对这些问题,本文以基于线性化玻尔兹曼方程的广义雷诺方程作为压力控制方程,建立了具有表面微织构特征的箔片轴承分析模型,通过Newton-Raphson迭代法和有限差分法对稳态广义雷诺方程进行求解,给出了表面微织构气体箔片轴承静态特性的求解方法,然后通过小扰动法和有限差分法求解广义雷诺方程,给出了表面微织构气体箔片轴承动力学特性的求解方程,奠定了全文的理论基础。在刚性表面及弹性表面条件下,通过分析无量纲气膜压力、厚度分布,研究了表面微织构的影响规律,分析了不同转速、微织构数量、微织构深度和偏心率时表面微织构对轴承静态特性的影响。在获得轴承静态特性的基础上,研究了上述四个参数变化时,表面微织构对轴承动力学特性的影响。结果表明,一定参数条件下,表面微织构可以改善刚性表面及弹性表面气体轴承性能。将表面微织构气体箔片轴承应用于涡轮泵转子系统中,根据轴承支反力计算了轴承动力学特性系数,建立了表面微织构轴承-转子系统有限元模型,并对其临界转速和不平衡响应进行了分析,结果表明:涡轮泵转子达到工作转速需跨两阶临界转速,工作转速附近无临界转速;涡轮泵转子系统不平衡响应幅值较小。本文为表面微织构技术应用于动压箔片轴承进行了初步探讨。
[Abstract]:The hydrodynamic gas foil bearing is widely studied because of its advantages of low friction, no pollution, high precision of rotation, strong adaptability, long life, good impact resistance, good stability and so on, especially suitable for high speed and light load machinery. Therefore, there are broad prospects for development and application in many fields. However, there are still many shortcomings in the dynamic pressure gas foil bearing, such as the friction between the foil and the journal in the starting process of the foil bearing, and the wear and tear of the foil structure before the rotor take-off. Surface microtexture technology provides a new way to improve the stiffness and bearing capacity of foil bearings, reduce the wear of foil, and increase the system damping. However, the application of surface microtexture technology to gas foil bearings has many scientific problems to be explored. For example, the mechanism of surface microtexture to improve tribological properties is not clear, and the scale of surface microtexture is relatively small. The characteristics of flow are different from those of large scale flow in bearing. To solve these problems, the generalized Reynolds equation based on linearized Boltzmann equation is used as the pressure control equation, and a foil bearing analysis model with surface microtexture characteristics is established. The steady-state generalized Reynolds equation is solved by Newton-Raphson iterative method and finite difference method. The method of solving the static characteristics of surface microtextured gas foil bearing is presented, and then the generalized Reynolds equation is solved by small perturbation method and finite difference method. The solution equation of the dynamic characteristics of surface microtextured gas foil bearing is given, which lays the theoretical foundation for the whole paper. Under the condition of rigid surface and elastic surface, by analyzing the distribution of dimensionless film pressure and thickness, the influence law of surface microtexture was studied, and the amount of microtexture at different rotational speed was analyzed. The influence of surface microtexture on the static characteristics of bearing with the depth of microtexture and eccentricity. Based on the static characteristics of the bearing, the influence of surface microtexture on the dynamic characteristics of the bearing was studied when the above four parameters were changed. The results show that surface microtexture can improve the performance of gas bearing on rigid surface and elastic surface under certain parameters. The surface microtexture gas foil bearing is applied to the turbine pump rotor system. According to the bearing support reaction force, the bearing dynamic characteristic coefficient is calculated, and the finite element model of the surface microtexture bearing-rotor system is established. The critical speed and the unbalance response of the turbine pump rotor are analyzed. The results show that the turbine pump rotor needs to span the second order critical speed and there is no critical speed near the working speed, and the unbalance response amplitude of the turbine pump rotor system is small. In this paper, the application of surface microtexture technology to hydrodynamic foil bearings is discussed.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH133.3;TH117.2
本文编号：2208109
[Abstract]:The hydrodynamic gas foil bearing is widely studied because of its advantages of low friction, no pollution, high precision of rotation, strong adaptability, long life, good impact resistance, good stability and so on, especially suitable for high speed and light load machinery. Therefore, there are broad prospects for development and application in many fields. However, there are still many shortcomings in the dynamic pressure gas foil bearing, such as the friction between the foil and the journal in the starting process of the foil bearing, and the wear and tear of the foil structure before the rotor take-off. Surface microtexture technology provides a new way to improve the stiffness and bearing capacity of foil bearings, reduce the wear of foil, and increase the system damping. However, the application of surface microtexture technology to gas foil bearings has many scientific problems to be explored. For example, the mechanism of surface microtexture to improve tribological properties is not clear, and the scale of surface microtexture is relatively small. The characteristics of flow are different from those of large scale flow in bearing. To solve these problems, the generalized Reynolds equation based on linearized Boltzmann equation is used as the pressure control equation, and a foil bearing analysis model with surface microtexture characteristics is established. The steady-state generalized Reynolds equation is solved by Newton-Raphson iterative method and finite difference method. The method of solving the static characteristics of surface microtextured gas foil bearing is presented, and then the generalized Reynolds equation is solved by small perturbation method and finite difference method. The solution equation of the dynamic characteristics of surface microtextured gas foil bearing is given, which lays the theoretical foundation for the whole paper. Under the condition of rigid surface and elastic surface, by analyzing the distribution of dimensionless film pressure and thickness, the influence law of surface microtexture was studied, and the amount of microtexture at different rotational speed was analyzed. The influence of surface microtexture on the static characteristics of bearing with the depth of microtexture and eccentricity. Based on the static characteristics of the bearing, the influence of surface microtexture on the dynamic characteristics of the bearing was studied when the above four parameters were changed. The results show that surface microtexture can improve the performance of gas bearing on rigid surface and elastic surface under certain parameters. The surface microtexture gas foil bearing is applied to the turbine pump rotor system. According to the bearing support reaction force, the bearing dynamic characteristic coefficient is calculated, and the finite element model of the surface microtexture bearing-rotor system is established. The critical speed and the unbalance response of the turbine pump rotor are analyzed. The results show that the turbine pump rotor needs to span the second order critical speed and there is no critical speed near the working speed, and the unbalance response amplitude of the turbine pump rotor system is small. In this paper, the application of surface microtexture technology to hydrodynamic foil bearings is discussed.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH133.3;TH117.2
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