空间关节的轴承间隙演化规律研究

发布时间：2018-01-11 11:08

本文关键词：空间关节的轴承间隙演化规律研究　出处：《燕山大学》2014年硕士论文　论文类型：学位论文

【摘要】：航天机构工作在温差大、高真空和高辐射的空间环境中，其运行状态和受力情况都会受到影响。本文以空间站大型机械臂的输出关节为研究对象，突破了以往在单一条件下的分析。重点研究交变温度、转动速度、载荷大小三个因素耦合作用下，关节处轴承的间隙演化规律，防止间隙过大或过小导致轴承发生故障，确保空间关节的安全可靠性，，从而达到减少航天机构发生故障的概率。本文的主要研究内容如下：首先，针对空间机械臂输出关节选用的轴承，分析其内部几何关系，结合赫兹接触理论对轴承几何参数进行计算，求出径向、轴向载荷作用下钢球的载荷分布及接触参数值；其次，进行空间机械臂轴承的受力特性分析，计算出轴承所能承载的最大轴向载荷。基于传统的赫兹接触理论和有限元软件ANSYS Workbench对轴向载荷作用下的轴承进行分析，得到轴承间隙的变化规律，并将两者进行对比验证；再次，结合轴承的工作环境，通过传热理论确定传热方式，基于摩擦生热计算出热载荷，并施加在有限元模型上，利用ANSYS Workbench求出轴承温度场分布。而且分别研究了轴承温度场随交变温度、转速和载荷大小三因素的变化趋势；最后，在已知轴承温度场分布的基础上，利用ANSYS Workbench软件对轴承进行热应力耦合分析，最终得到不同环境温度、不同轴承运转速度和不同工作载荷时轴承的间隙演化规律。
[Abstract]:In the space environment with large temperature difference, high vacuum and high radiation, the operating state and the force condition of the spaceflight mechanism will be affected. In this paper, the output joint of the large manipulator of the space station is taken as the research object. It breaks through the previous analysis under a single condition and focuses on the law of the clearance evolution of the joint bearing under the coupling of three factors: alternating temperature rotation speed and load. The main contents of this paper are as follows: (1) to prevent the bearing failure caused by too large or too small clearance and to ensure the safety and reliability of the space joint so as to reduce the probability of the spaceflight mechanism failure. First of all, aiming at the bearing selected by the output joint of the space manipulator, the internal geometric relationship is analyzed, and the geometric parameters of the bearing are calculated by combining with Hertz contact theory, and the radial direction is obtained. The load distribution and contact parameters of steel ball under axial load; Secondly, the mechanical characteristics of space mechanical arm bearing are analyzed. Based on the traditional Hertz contact theory and finite element software ANSYS Workbench, the bearing under axial load is analyzed. The change law of bearing clearance is obtained, and the two are compared and verified. Thirdly, combined with the working environment of the bearing, the heat transfer mode is determined by the heat transfer theory, and the thermal load is calculated based on the friction heat generation, and applied to the finite element model. The distribution of bearing temperature field is obtained by ANSYS Workbench, and the variation trend of bearing temperature field with alternating temperature, rotational speed and load is studied respectively. Finally, on the basis of known temperature field distribution of bearing, the thermal stress coupling analysis of bearing is carried out by using ANSYS Workbench software, and finally different ambient temperatures are obtained. The clearance evolution law of bearing with different operating speed and load.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TH133.3

【参考文献】