【作者】 吴松；

【导师】 王家序；

【作者基本信息】 重庆大学 ， 机械设计及理论， 2011， 硕士

【摘要】 以水为润滑介质的板条式水润滑橡胶合金轴承,与传统以油为润滑介质的金属轴承的润滑机理有所不同。水的黏度只有油1/100,当供水压力高,轴颈转速高时,容易产生紊流,因此在对润滑模型进行有限元分析时,不能将水膜假设为层流模型。橡胶为低弹性模量材料,在流体动压润滑时,橡胶变形量大,不能像金属轴承那样忽略不计。橡胶弹性变形的退让使得轴的偏心率可以大于1。板条式水润滑橡胶合金轴承沟槽的存在,使得水膜压力较油润滑低,一方面由于温度对橡胶材料的力学特性影响较大,需要沟槽中的冷却水将产生的热量带走;另一方面沟槽为橡胶变形提供空间,改善橡胶与铜粘接面的受力。论文针对板条式水润滑橡胶合金轴承特殊的润滑机理,利用Workbench CFX有限元软件对轴承润滑模型进行3D数值仿真分析。论文从转速、偏心率、橡胶材料、板条结构等角度对水膜压力分布、水膜流场分布、水膜厚度等方面深入研究了板条式水润滑轴承的流体动压润滑性能。由于橡胶轴承动压润滑过程是一个双向的流固耦合,因此橡胶的弹性变形,应力分布等也是论文研究的重点。随后通过实验研究了温度对橡胶材料性能的影响,因为当轴承系统供水系统出现故障或是轴承系统出现过载时,轴与轴承之间处于干摩擦状态。当轴承系统处于干摩擦状态时不仅摩擦系数会增大而加速轴与轴承的磨损,还会使轴承温度升高,改变橡胶的力学性能,加速橡胶老化,甚至出现烧焦现象。根据实验得到的数据,论文进一步利用ABAQUS有限元软件对板条式水润滑橡胶合金轴承,在干摩擦状态下的热结构耦合模型进行了分析。通过分析论文研究了板条式水润滑橡胶合金轴承在干摩擦工况时轴承系统接触面的温度分布、接触应力分布以及能量随时间的变化。论文内容得到国家自然科学基金面上项目“大尺寸高比压水润滑轴承的创新设计理论与方法”(项目编号:50775230)的支持,拟通过上述研究对板条式水润滑橡胶合金轴承的润滑机理和干摩擦热结构耦合的相关研究方法提供新的借鉴。更多还原

【Abstract】 Water lubricated rubber slab bearings lubricated with water have performances different from which lubricated with traditional oil as the medium of metal bearing lubrication mechanism. The viscosity of water is only 1 / 100 compare with oil, when the water supply pressure is high and the journal at high speed, the stream prone to turbulence, so the lubrication system on the finite element analysis can not be assumed to be laminar flow model of water film. Low modulus of elasticity of rubber materials, when the bearings in hydrodynamic lubrication, large deformation of rubber bearings that can not be like the metal bearings is ignored. Rubber elastic deformation of the concessions made to the shaft eccentricity greater than or equal to1. Water lubricated rubber alloy slab bearings’groove makes the water film pressure is low than the presence of oil lubrication, while the temperature on the mechanical properties of rubber materials greatly influenced, the cooling water in grooves can take the heat away which was produced by friction; another side grooves provide space for the deformation of rubber, so the rubber and copper bonding surface to improve the stress.Thesis contrapose water lubricated rubber alloy bearing strip special lubrication mechanism, the use of Workbench CFX finite element software for 3D on the bearing lubrication system on numerical simulation. Papers from the rotational speed, eccentricity, rubber materials, lath structure and so on to study the lath-type water lubricated hydrodynamic bearing performance which about the pressure distribution on the water film, water film flow field and water film thickness The rubber bearing lubrication process is a two-way coupling, so the rubber elastic deformation, stress distribution is also the thesis research.Subsequent paper passed the experimental study of the temperature on the properties of rubber material. When the bearings of water supply system failure or bearings overload, the shaft and the bearing were in dry friction. When the bearing system in dry friction is not only the friction coefficient would increase which would speed up the shaft and bearing wear, but also to change the bearing temperature mechanical properties of rubber and even accelerated aging of burning rubber.Using experimental data obtained, the paper further use of finite element software ABAQUS. The water lubricated rubber alloy slab bearings under dry friction in the thermal structure of the coupling is analyzed. By analyzing the thesis study when the water lubricated rubber slab bearings under dry friction condition, the bearing contact surface temperature distribution, the contact stress distribution and the energy changes with time.This research is supported by the State Natural Sciences Foundation General Projects:“Innovative design theory and method of water lubricated bearing system with large size and high specific pressure”(Number: 50775230). The paper will provide reference methods for the study of lubrication mechanism and thermal structure under dry friction condition.更多还原