单油楔双向润滑槽滑动轴承静动态特性研究

发布时间：2018-12-11 05:38

【摘要】：滑动轴承以承载力大、功耗小、耐冲击、运转精度高、抗震性好被广泛用于汽轮机等动力传输系统中,可以说,滑动轴承性能的好坏直接影响机械部件的使用寿命与正常运行。随着工程技术的发展,极端环境下机械部件的正常运行成为大家所关注的焦点,例如高温、高压、高转速和重载荷等。对滑动轴承在极端条件下进行研究可明确滑动轴承在极端条件下的运行状况,对后续滑动轴承研发与特性研究具有重要的实际意义。轴在转动过程中,在剪切力的作用下润滑油粘性耗散产生一定的热量,且在渐扩区域发生明显的空化现象,故滑动轴承粘温特性与空化现象不容忽视。鉴于此,本文以单油楔双向润滑槽滑动轴承为研究对象,采用数值模拟方法对滑动轴承静动态特性进行研究。本文主要研究内容如下:第一章:论述了单油楔双向润滑槽滑动轴承研究背景与意义,并阐述了滑动轴承国内外研究现状;第二章:对滑动轴承数值计算模型做了简要概述;第三章:滑动轴承数值计算模型的验证及网格独立性检验,确立了单油楔双向润滑槽滑动轴承计算模型;第四章:分别在不同偏心率、不同供油角度、不同供油压力、不同供油温度、不同环境温度与不同轴转速下单油楔双向润滑槽滑动轴承的静态特性进行了研究;第五章:以某一稳态工况点流场参数分布为初值,对轴施加阶跃扰动载荷,根据相对运动原理,提出了轴瓦平动、主轴旋转的流固耦合计算方法,研究了单油楔双向润滑槽滑动轴承的动态特性。
[Abstract]:Sliding bearings are widely used in power transmission systems such as steam turbines because of their large bearing capacity, low power consumption, high impact resistance, high operating precision and good seismic resistance. It can be said that the performance of sliding bearings directly affects the service life and normal operation of mechanical components. With the development of engineering technology, the normal operation of mechanical components in extreme environment has become the focus of attention, such as high temperature, high pressure, high speed and heavy load. The study of sliding bearings under extreme conditions can make clear the running condition of sliding bearings under extreme conditions, which is of great practical significance to the subsequent research and development of sliding bearings and the study of their characteristics. In the process of shaft rotation, the viscosity dissipation of lubricating oil under the action of shear force produces certain heat, and obvious cavitation occurs in the area of gradual expansion, so the visco-temperature characteristic and cavitation phenomenon of sliding bearing can not be ignored. In view of this, the static and dynamic characteristics of single oil wedge bidirectional lubricating groove sliding bearing are studied by numerical simulation method. The main contents of this paper are as follows: chapter 1: the research background and significance of single oil wedge bidirectional lubricating groove sliding bearing are discussed, and the present research situation of sliding bearing at home and abroad is expounded. Chapter 3: verify the numerical calculation model of sliding bearing and verify the independence of grid, and establish the calculation model of single oil wedge two-way lubricating groove sliding bearing. Chapter 4: the static characteristics of the bearing with different eccentricity, different oil supply angle, different oil supply pressure, different oil supply temperature, different environment temperature and different shaft speed are studied. Chapter 5: taking the flow field parameter distribution of a steady state point as the initial value, applying the step disturbance load on the shaft, according to the principle of relative motion, the fluid-solid coupling calculation method of the axial bearing is put forward. The dynamic characteristics of single oil wedge two-way lubricating groove sliding bearing are studied.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH133.31

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