盾构机主轴承的有限元分析及寿命研究

发布时间：2018-03-13 03:10

本文选题：盾构机　切入点：回转支承　出处：《河南科技大学》2011年硕士论文　论文类型：学位论文

【摘要】：盾构机是隧道施工中的主要施工机械,必须具有高可靠性,能够稳定地工作。盾构机主轴承是盾构机的关键部件,多采用三排滚柱式回转支承,其结构和受载情况复杂,容易产生较大的应力和变形,影响盾构机的施工安全。由于盾构机主轴承的尺寸较大,滚动体数目较多,所以内、外圈与滚动体之间的接触部位较多,接触状态复杂。理论方法和有限元法计算该轴承的承载能力、变形及载荷分布都非常复杂。本文采用传统轴承理论分析方法和有限元法分别对该轴承的承载能力、变形及载荷分布状态进行分析研究。首先分析了该轴承在静载荷作用下三排滚动体的受力状态,应用滚动轴承载荷分布计算方法,对轴承在轴向力、径向力及倾覆力矩作用下的三列滚动体的载荷分布进行了计算。得出了每个受载滚子的载荷、最大接触应力及变形的值,并确定出每列滚动体最大载荷滚子所在的位置。而后利用ANSYS有限元分析软件,分别分析了轴承在轴向力、径向力及倾覆力矩单独作用下和联合作用下的应力及变形状态。有限元分析得到的轴承载荷分布规律、应力及变形的计算结果与滚动轴承的理论计算结果基本接近。由于盾构机主轴承是低速重载回转轴承,其损坏形式一般表现为疲劳断裂。因此在轴承力学性能分析的基础上,利用经典的疲劳寿命分析理论和轴承疲劳寿命分析方法,结合该轴承实际结构,分析了轴承疲劳寿命。分析结果显示,轴承的疲劳寿命满足预期使用寿命。多工况下盾构机主轴承力学性能的实验结果和理论分析结果在变化趋势方面有很好的一致性。通过对盾构机主轴承的受力状态和疲劳寿命的研究,以及对盾构机主轴承的承载性能实验,为盾构机主轴承的选型和优化设计奠定了基础。
[Abstract]:Shield machine is the main construction machine in tunnel construction, it must have high reliability and be able to work stably. The main bearing of shield machine is the key part of shield machine. It is easy to produce large stress and deformation, which affects the construction safety of shield machine. Because the size of the main bearing of shield machine is large and the number of rolling body is more, there are more contact parts between the outer ring and the rolling body. The contact state is complicated. The bearing capacity, deformation and load distribution of the bearing are calculated by theoretical method and finite element method. In this paper, the bearing capacity, deformation and load distribution of the bearing are studied by using the traditional bearing theory analysis method and the finite element method. By using the method of load distribution calculation of rolling bearings, the load distribution of three series of rolling bodies under the action of axial force, radial force and overturning moment is calculated. The values of load, maximum contact stress and deformation of each loaded roller are obtained. The position of the maximum load roller for each row of rolling body is determined, and then the axial force of the bearing is analyzed by using ANSYS finite element analysis software. The stress and deformation state of bearing under the action of radial force and overturning moment separately and jointly. The results of stress and deformation calculation of bearing obtained by finite element analysis are close to the theoretical calculation results of rolling bearing. Because the main bearing of shield machine is low speed and heavy load rotary bearing, its damage form is generally manifested as fatigue fracture. Therefore, based on the analysis of bearing mechanical properties, the classical theory of fatigue life analysis and the fatigue life analysis method of bearing are used. Combined with the actual structure of the bearing, the fatigue life of the bearing is analyzed. The fatigue life of the bearing meets the expected service life. The experimental results of the mechanical properties of the main bearing of the shield machine under multiple working conditions are in good agreement with the theoretical analysis results in terms of the changing trend. Based on the study of the stress state and fatigue life of the main bearing of the shield machine and the experiment on the bearing capacity of the main bearing of the shield machine, the foundation has been laid for the selection and optimization design of the main bearing of the shield machine.
【学位授予单位】：河南科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH133.33

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