水润滑橡胶轴承热弹流润滑特性的研究

发布时间：2018-04-25 01:34

本文选题：水润滑 + 橡胶轴承　；参考：《西安科技大学》2017年硕士论文

【摘要】：本文以水润滑橡胶轴承为研究对象,基于橡胶衬层的弹性变形和流体动力润滑理论,并考虑润滑介质温度对水润滑橡胶轴承润滑特性的影响,建立了水润滑橡胶轴承双向热流固耦合模型。采用有限元法和有限体积法,讨论了水润滑橡胶轴承热弹流润滑特性,并研究了不同参数对水润滑橡胶轴承热弹流润滑特性的影响。其主要内容和结论如下:(1)建立了水润滑橡胶轴承双向热流固耦合模型,通过对轴承实际运转情况的分析,确定合适的边界条件,并给出了水润滑橡胶轴承水膜承载力、摩擦力和摩擦系数的计算方法。对橡胶衬层材料进行参数试验,通过实验得到表征橡胶材料力学性能的模型参数,结合研究内容的实际状况确定了所用材料的参数。(2)针对十六沟槽的水润滑橡胶轴承,分析了进水温度对其润滑特性的影响,分别研究了水膜压力、流场速度以及橡胶衬层变形的变化,并计算了水膜承载力、摩擦力和摩擦系数。研究结果表明:润滑介质温度较低时,流体动压效应越好,水膜压力越大,橡胶衬层变形量也随之增大;与高温润滑状态相比,低温下水的粘度较大,水膜连续性更好,承载力增大。(3)基于水润滑橡胶轴承双向热流固耦合模型,讨论了轴颈转速,偏心率以及盐水浓度对水润滑橡胶轴承热弹流润滑特性的影响。结果表明:随着轴颈转速和偏心率增大,水膜压力和橡胶衬层的变形量增大,承载力提高,摩擦系数降低。但偏心率过大或过小都不利于水膜的连续性。在一定范围内转速越大,水膜连续性越好;与清水相比,盐水润滑条件下的水膜压力、橡胶衬层变形量以及承载力均增大,摩擦系数减小。
[Abstract]:Based on the theory of elastic deformation and hydrodynamic lubrication of rubber liner, the influence of temperature of lubricating medium on lubricating characteristics of water lubricated rubber bearing is considered in this paper. A two-way heat-fluid-solid coupling model for water-lubricated rubber bearings is established. The characteristics of thermo-elastohydrodynamic lubrication of water-lubricated rubber bearings were discussed by finite element method and finite volume method, and the effects of different parameters on thermo-elastohydrodynamic lubrication of water-lubricated rubber bearings were studied. The main contents and conclusions are as follows: (1) the bidirectional heat fluid-solid coupling model of water lubricated rubber bearing is established. Through the analysis of the actual operation of the bearing, the proper boundary conditions are determined, and the bearing capacity of water film of water lubricated rubber bearing is given. The calculation method of friction force and friction coefficient. The parameters of rubber lining materials were tested, and the model parameters were obtained to characterize the mechanical properties of rubber materials. According to the actual situation of the research contents, the parameters of the materials used were determined. (2) the water-lubricated rubber bearings with sixteen grooves were used. The influence of influent temperature on the lubricating properties was analyzed. The changes of water film pressure, flow field velocity and rubber liner deformation were studied, and the bearing capacity, friction force and friction coefficient of water film were calculated. The results show that when the temperature of lubricating medium is low, the better the hydrodynamic pressure effect is, the greater the water film pressure is, the more the deformation of rubber lining is, and the higher the viscosity of low temperature water is, the better the continuity of water film is compared with the high temperature lubrication state. Based on the bidirectional heat fluid-solid coupling model of water-lubricated rubber bearings, the effects of journal speed, eccentricity and salt water concentration on the thermo-elastohydrodynamic lubrication characteristics of water-lubricated rubber bearings are discussed. The results show that the water film pressure and the deformation of rubber liner increase with the increase of journal speed and eccentricity, the bearing capacity increases and the friction coefficient decreases. However, too large or too small heart rate is not conducive to the continuity of the water film. The higher the rotational speed in a certain range, the better the continuity of water film. Compared with clear water, the water film pressure, deformation and bearing capacity of rubber lining under brine lubrication condition are increased, and the friction coefficient is reduced.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH133.3

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