多瓦可倾瓦径向滑动轴承热润滑性能的研究

发布时间：2018-05-12 16:53

本文选题：径向滑动轴承 + 多瓦可倾瓦　；参考：《浙江大学》2012年硕士论文

【摘要】：多瓦可倾瓦径向滑动轴承常用于大型的水轮机等旋转机械上,其工作性能直接影响整个机器的工作状态,又由于多瓦可倾瓦径向滑动轴承的制造和试验成本较高,而通过对轴承热润滑性能方面的理论研究能够得到比较接近实际情况的结果,可用于指导轴承设计和参数优化,因此,有必要研究多瓦可倾瓦径向滑动轴承的热润滑性能。本文第一部分阐述了研究多瓦可倾瓦径向滑动轴承热润滑性能的工程意义,介绍了径向滑动轴承的轴承结构、支承与瓦块、轴承承载形式、轴瓦材料、润滑方式及轴承的失效形式等,从径向滑动轴承的润滑性能、可倾瓦径向滑动轴承热润滑性能及径向滑动轴承实验研究等几方面综述了可倾瓦径向滑动轴承热润滑性能的研究进展,并以此提出了本文的研究内容。第二部分推导了多瓦可倾瓦径向滑动轴承的油膜厚度方程,建立了轴承热流体动力润滑(THD)的数学模型,主要有雷诺方程、油膜厚度方程、润滑油粘度、密度—温度关系式、能量方程、固体热传导方程、力及力矩平衡方程和边界条件,并对方程进行无量纲和离散化处理,介绍了相应的数值计算方法,设计了数值计算流程,编制了FROTRAN计算程序,计算了算例轴承的热润滑参数,分析了轴承运行工况、瓦块支承位置、润滑油热传导系数的选取等因素对轴承热润滑性能的影响。第三部分推导了轴偏斜时的多瓦可倾瓦径向滑动轴承的油膜厚度方程,分别编制了单自由度瓦和双自由度瓦径向滑动轴承在轴偏斜时的FORTRAN计算程序,对比分析了轴偏斜对这两种可倾瓦径向滑动轴承的热润滑性能的影响。第四部分建立了多瓦可倾瓦径向滑动轴承热弹流(TEHD)分析的数学模型,计算了轴瓦弹性变形量,编制了相应的FORTRAN计算程序,在程序计算时,采用了变精度试算法以节省计算时间,对比分析了多瓦可倾瓦径向滑动轴承THD与TEHD性能及在轴颈偏斜时的单自由度瓦径向滑动轴承THD与TEHD性能,分析了轴承运行工况对其TEHD性能的影响。第五部分总结了本文的工作内容,指出了存在的不足以及进一步研究的内容。
[Abstract]:Multi-tile tilting pad radial sliding bearing is often used in large rotating machinery such as hydraulic turbine. Its working performance directly affects the working state of the whole machine, and the manufacturing and testing cost of multi-tile tilting pad radial sliding bearing is high. Through the theoretical study of the bearing thermal lubrication performance, the results can be obtained close to the actual situation and can be used to guide the bearing design and parameter optimization. Therefore, it is necessary to study the thermal lubrication performance of the multi-tile tilting pad radial sliding bearing. In the first part of this paper, the engineering significance of studying the thermal lubrication performance of multi-tile tilting pad radial sliding bearing is expounded, and the bearing structure, bearing and tile block, bearing form, bearing material, bearing structure of radial sliding bearing are introduced. Lubrication methods and failure forms of bearings, lubricating properties of radial sliding bearings, The thermal lubrication performance of tilting pad radial sliding bearing and the experimental study of radial sliding bearing are reviewed in this paper, and the research contents of this paper are put forward. In the second part, the oil film thickness equation of multi-tile tilting pad radial sliding bearing is derived, and the mathematical model of bearing thermal hydrodynamic lubrication (THD) is established. There are Reynolds equation, oil film thickness equation, lubricating oil viscosity, density and temperature relation. The energy equation, solid heat conduction equation, force and torque balance equation and boundary condition are treated with dimensionless and discretization. The corresponding numerical calculation method is introduced, the numerical calculation flow is designed, and the FROTRAN calculation program is compiled. The thermal lubrication parameters of bearing are calculated and the influence of operating condition of bearing, bearing position of tile block and heat conduction coefficient of lubricating oil on the thermal lubrication performance of bearing is analyzed. In the third part, the oil film thickness equation of multi-tile tilting pad radial sliding bearing is derived, and the FORTRAN calculation program of single-freedom and two-degree-of-freedom radial sliding bearing under axial deflection is developed, respectively. The influence of shaft deflection on the thermal lubrication performance of these two tilting pad radial sliding bearings is analyzed. In the fourth part, the mathematical model of thermal elastohydrodynamic analysis of multi-tile tilting pad radial sliding bearing is established, the elastic deformation of bearing is calculated, the corresponding FORTRAN calculation program is compiled, and the variable precision test algorithm is used to save calculation time. The performance of THD and TEHD of multi-tile tilting pad radial sliding bearing and the performance of THD and TEHD of single-degree-of-freedom radial sliding bearing with journal deflection are compared and analyzed. The influence of bearing operating condition on TEHD performance is analyzed. The fifth part summarizes the work of this paper, points out the shortcomings and further research content.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH133.3

【参考文献】