基于ABAQUS的圆柱滚子轴承动力学研究

发布时间：2018-09-17 19:05

【摘要】：滚动轴承作为旋转机械中最重要的零部件,其运行状态的好坏直接影响到整台设备的性能和使用寿命。疲劳失效作为滚动轴承最常见的失效类型,最初来源于疲劳载荷下形成的次表面裂纹,后逐渐演化为宏观的疲劳剥落。疲劳剥落的形成使滚动轴承逐渐趋于失效并且伴随着动力学性能的改变。因此,研究滚动轴承在完好和带有缺陷状态以及在不同转速下的动力学特征,对于滚动轴承的故障机理研究和故障诊断具有十分重要的意义。本文主要研究内容包括:(1)建立了基于ABAQUS/Explicit的单列圆柱滚子轴承有限元动力学分析模型。总结了圆柱滚子轴承的运行状况并确定其动力学仿真边界条件,为了更接近轴承实际运行状态,在有限元模型的建立中未对滚动体进行任何自由度的约束。为了对单一滚动体-套圈接触对的接触力动态响应进行研究,模型采用面对面接触和通用接触结合的方式建立接触关系并且通过对运转过程中滚动体公转和自转转速的分析验证了该动力学模型的正确性。(2)分析了无缺陷滚子轴承在不同内圈转速下的动力学行为,包括轴承各部件运动学规律、等效应力分布、接触应力分布和接触状态特点、参考点轴心轨迹变化以及外圈节点加速度响应。根据滚动体不同环形路径的切应力分布和数值变化规律分析了轴承缺陷产生机理;通过对比分析单一滚动体-套圈接触对接触力分量变化,得出了接触力分量随滚动体位置的变化规律。(3)研究了不同转速下外滚道带有局部剥落缺陷的滚子轴承动力学行为。在无缺陷圆柱滚子轴承动力学仿真的基础上,建立外圈承载区下端带有局部剥落缺陷的动力学模型,并以此分析了不同转速下滚动体进入、经过和滚出剥落缺陷的动力学响应特性。根据滚动体-外圈接触力历程输出和接触力分量变化规律,确定滚子进入和滚出缺陷的时刻,并以此估计剥落缺陷的周向尺寸。
[Abstract]:As the most important parts in rotating machinery, the running state of rolling bearing directly affects the performance and service life of the whole equipment. As the most common failure type of rolling bearing, fatigue failure originates from the subsurface crack formed under fatigue load, and then evolves into macroscopic fatigue spalling. The formation of fatigue spalling makes rolling bearings tend to fail gradually and with the change of dynamic performance. Therefore, it is of great significance to study the dynamic characteristics of rolling bearings in intact and defective states and at different rotational speeds for the study of fault mechanism and fault diagnosis of rolling bearings. The main contents of this paper are as follows: (1) the finite element dynamic analysis model of single row cylindrical roller bearing based on ABAQUS/Explicit is established. The running condition of cylindrical roller bearing is summarized and its dynamic simulation boundary condition is determined. In order to get closer to the actual running state of the bearing, the rolling body is not constrained by any degree of freedom in the establishment of finite element model. In order to study the dynamic response of the contact force of a single rolling body-ring contact pair, The contact relationship is established by the combination of face to face contact and universal contact. The correctness of the dynamic model is verified by the analysis of the rolling body rotation and rotation speed. (2) the non-defect roller is analyzed. The dynamic behavior of bearings at different inner ring speeds, It includes the kinematics law of bearing components, equivalent stress distribution, contact stress distribution and contact state characteristics, the change of axis locus of reference point and acceleration response of outer ring joint. According to the shear stress distribution and numerical variation law of different annular paths of rolling body, the mechanism of bearing defect is analyzed, and the change of contact force component of single rolling body and ring contact is compared and analyzed. The dynamic behavior of roller bearing with local flaking defect in outer raceway under different rotational speeds is studied. On the basis of dynamic simulation of non-defect cylindrical roller bearing, a dynamic model with local flaking defects at the lower end of the outer ring bearing area is established, and the entry of the rolling body at different rotational speeds is analyzed. Dynamic response characteristics of exfoliating defects through and out. According to the relation between rolling body and outer ring contact force and the change of contact force component, the time of roller entering and rolling out of defect is determined, and the circumferential dimension of flaking defect is estimated.
【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】：TH133.33

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