基于ANSYS的起重机回转支承接触问题的有限元分析

发布时间：2018-01-16 17:39

本文关键词：基于ANSYS的起重机回转支承接触问题的有限元分析　出处：《西南交通大学》2011年硕士论文　论文类型：学位论文

【摘要】：回转支承是一种特殊的大型轴承,由于能够承受综合载荷的作用,被广泛地应用于工程机械等领域,是工程机械的关键部件之一。回转支承是依靠滚动体与内、外圈的滚动接触来支撑转动部件并传递力和运动的,因此,接触问题是研究回转支承的基础,直接影响着回转支承的承载能力和使用寿命。接触问题是一种高度非线性问题,本文利用有限元法对回转支承的接触问题进行了分析,其具体内容和结果如下：论文首先总结了国内外回转支承的发展概况和接触问题有限元分析的研究现状,对回转支承的接触问题以及有限元法进行了全面的介绍,并提出了分析回转支承接触问题的有限元方法。其次以QY25型汽车起重机的回转支承为例,通过起重机各种不同的作业工况来分析回转支承的受力情况,得出起重机工作时的工作幅度和起重载荷对回转支承的受力影响较大。并运用赫兹接触理论计算了某一工况下回转支承的滚动体与内、外圈的最大接触应力与接触椭圆的大小,为后文进行有限元分析时确定接触区域单元尺寸的大小和接触对的创建提供理论依据。最后运用ANSYS有限元分析软件对QY25型汽车起重机的回转支承进行了接触分析,并将有限元分析结果与赫兹接触理论计算结果的进行比较,进一步验证了三维接触模型的网格划分、接触算法及边界条件等的正确性,同时还对两种结果进行了误差分析,结果表明采用数值法(有限元分析)求解接触问题更加方便、直观、准确。并在此基础上分析了椭圆形滚道回转支承滚动体与内、外圈的接触情况,通过同种工况下两种类型滚道的接触应力的对比分析,得出椭圆形滚道回转支承的承载能力比圆形滚道回转支承的承载能力要高。
[Abstract]:Rotary bearing is a kind of special large bearing, which is widely used in construction machinery and one of the key parts of construction machinery because of its ability to withstand the comprehensive load. The slewing bearing depends on the rolling body and the inside. The rolling contact of the outer ring is used to support the rotating parts and transfer the force and motion, so the contact problem is the basis of the study of the rotary bearing. The contact problem is a highly nonlinear problem. The finite element method is used to analyze the contact problem of the slewing bearing. Its specific content and results are as follows: Firstly, the paper summarizes the development of rotary bearings at home and abroad and the research status of finite element analysis of contact problems, and gives a comprehensive introduction to the contact problems of slewing bearings and the finite element method. A finite element method is proposed to analyze the contact problem of slewing bearings. Secondly, taking the slewing support of QY25 truck crane as an example, the stress of the slewing support is analyzed through various working conditions of the crane. It is concluded that the working range and the lifting load of the crane have great influence on the force of the slewing bearing, and the rolling body and the inner part of the slewing bearing under a certain working condition are calculated by using the Hertz contact theory. The maximum contact stress of outer ring and the size of contact ellipse provide a theoretical basis for determining the size of element in contact area and the establishment of contact pair later in finite element analysis. Finally, the contact analysis of the slewing bearing of QY25 truck crane is carried out by using ANSYS finite element analysis software, and the results of finite element analysis are compared with the results of Hertz contact theory. The accuracy of mesh generation, contact algorithm and boundary conditions of the 3D contact model is further verified. At the same time, the error analysis of the two results is carried out. The results show that the numerical method (finite element analysis) is more convenient, intuitionistic and accurate to solve the contact problem. On this basis, the contact between the rolling body of the elliptical raceway slewing bearing and the inner and outer rings is analyzed. By comparing and analyzing the contact stresses of two kinds of raceways under the same working conditions, it is concluded that the bearing capacity of elliptical raceway slewing bearing is higher than that of circular raceway slewing bearing.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH21

【引证文献】