不同引导方式下保持架运动特性分析

随着对滚动轴承性能的要求越来越高,其动力学特性成为轴承设计至关重要的部分。针对角接触球轴承腔内保持架的运动特性,基于ADAMS建立了保持架不同引导方式下的动力学仿真模型,对比分析了在保持架不同引导方式及不同工况下角接触球轴承腔内保持架打滑率、质心轨迹、质心速度与质心加速度等变化规律。该研究对滚动轴承结构优化设计、提高轴承稳定性具有重要的参考意义。     

滚动轴承保持架动力学研究进展

保持架动力学性能对于滚动轴承的高速和噪声性能至关重要,从理论和试验研究两个方面综述了国内、外在滚动轴承保持架动力学方面的主要进展,并对保持架未来的研究方向进行了展望。     

航空高速滚动轴承的摩擦学效应分析

考虑工件表面粗糙度的影响，将部分弹性流体动力润滑理论耦合于高速滚动轴承性能研究之中，建立了高速滚动轴承拟动力学模型，分析了轴承润滑中膜厚比以及粗糙表面纹理方向对滚子转速和保持架转速及滑差率的影响，揭示了高速滚动轴承运动性能的摩擦学效应。     

高速滚动轴承考虑表面粗糙效应的运动特性分析

在高速滚动轴承运动特性分析中,考虑了表面粗糙效应.对高速滚动轴承保持架和滚子运动性能进行了测定.详细分析了高速滚子轴承各运行工况参数和摩擦学参数,尤其是高速轴承中的表面粗糙度效应对轴承运动性能的影响,分析了轴承元件表面粗糙度对转速及其打滑的影响,揭示了表面粗糙效应对轴承运转的动力学影响.寻找轴承元件打滑的原因,探索提高轴承寿命的新途径.     

基于ANSYS/LS-DYNA的保持架动力学分析

保持架失效是滚动轴承常见故障之一。为研究保持架的动态特性,使用拟动力学方法建立滚动轴承平衡方程组,Newton-Raphson方法求解方程组得到滚动体的转速;在ANSYS/LS-DYNA中建立滚动体/保持架有限元模型,施加转速和约束条件并进行动力学仿真,得到保持架的应力分布和动态响应,分析了径向游隙、兜孔游隙对保持架动态特性的影响。     

内外圈反向旋转的轴承保持架动态特性试验机研制及试验分析

针对现有滚动轴承保持架动态特性试验机存在的不足,提出一种内外圈可反向旋转的保持架动态特性试验机。采用两个电机分别驱动轴承内外圈反向旋转,提高轴承套圈的相对转速,并能实现保持架的转速可控;在被试轴承保持架端部垂直布置两个激光线位移传感器,在不改变保持架结构的条件下能同时测得保持架质心的轴向和径向运动;利用该试验机进行了几种工况下的保持架动态特性试验,试验结果与轴承动力学仿真结果吻合,为深入探究保持架的运动机理提供了试验基础。     

基于ADAMS的圆柱滚子轴承保持架柔性化建模及仿真分析

采用Pro/E对某型号圆柱滚子轴承建模后导入ADAMS中,建立了保持架为柔性体的刚柔耦合圆柱滚子轴承模型,对其进行了动力学仿真,并分析了不同工况下保持架柔性变形对其动态性能的影响,为滚动轴承的设计提供了必要的理论基础。     

滚动轴承弹性接触动态特性有限元分析

滚动轴承弹性滚动接触动态特性直接影响转子系统的精度及动态特性,针对滚动轴承弹性滚动接触动态特性问题,以深沟球轴承61914为例,在同时考虑内环、外环、滚珠及保持架变形的情况下,建立滚动轴承三维弹性滚动接触有限元模型,采用有限单元法计算滚动轴承在不同转速、径向力及轴向力等载荷工况下滚动轴承的接触应力及滚珠与内环的运动状态。结果表明,有限单元法能在满足高精度计算的情况下求解各种复杂工况下的滚动轴承动力学特性,为进一步研究滚动轴承弹性滚动接触动态特性提供有力的研究方法。     

高速圆柱滚子轴承动力学分析

建立相应坐标系,对滚动轴承中滚子与滚道、滚子与保持架、保持架与引导套圈之间的相互几何作用进行分析,计算出各部件之间作用力和力矩,采用牛顿-欧拉方程建立6自由度滚动轴承动力学模型,对滚动轴承进行动力学分析,为圆柱滚子轴承设计提供理论依据。     

保持架间隙对滚动轴承性能的影响

保持架间隙对滚动轴承性能的影响江苏石油化工学院郑伯伟上海交通大学董师予关键词：滚动轴承,保持架,间隙滚动轴承主要由滚动体、内圈、外圈和保持架组成,其中保持架的作用是将滚动体保持在保持架内,沿圆周均匀分布;同时保持架可以避免滚动体之间相互接触,否则由于...     

涡轮泵流体静压轴承设计及性能特性分析

针对流体静压轴承在液体火箭发动机涡轮泵中的设计和应用,以现有的滚动轴承支承的涡轮泵转子为应用对象,提出流体静压轴承的参数设计思路,采用粒子群优化算法设计得到支承刚度最大化的轴承结构参数组合,并计算分析所设计轴承的性能以及轴承-转子系统的动力学特性。分析表明：优化设计得到流体静压轴承的承载力和支承刚度可以满足要求,但轴承总流量达泵流量的21%,这会显著降低涡轮泵的总体效率;仅将滚动轴承改为流体静压轴承,而不改变其他结构或布局,转子的稳定性不能满足要求;涡轮泵流体静压轴承转子系统设计时应尽量将轴承布置在转子位移较大的位置,以充分发挥其阻尼作用。     

Optimization of partially crowned roller profiles for tapered roller bearings

The roller profile plays a key role in the overall performance of roller bearings. In traditional profile design for roller bearings, the roller profile was often analyzed in terms of the bearing performance, particularly the fatigue life. However, the bearing dynamic stiffness and fatigue life were seldom considered simultaneously in the design of Tapered roller bearings (TRBs). Among the available roller profiles, the partially crowned roller profile has been acknowledged as one of the best from the viewpoint of the bearing fatigue life and stiffness characteristics. This paper presented a design optimization for the partially crowned roller profile to improve the performance of TRBs. Two profile parameters of rollers employed for TRBs including the central flat length and crown radius were investigated. The optimal design parameters for the roller profile were obtained in consideration of both bearing fatigue life and stiffness. The proposed design approach was useful and applicable for further geometrical optimization, manufacturing, and engineering application of rolling bearings.     

滚动轴承动力学的研究

为了降低轴承噪声、优化高速轴承动特性,更精确的轴承动力学设计是亟待解决的问题,从理论研究和试验测试两方面综述了国内外轴承动力学研究的主要进展。国外滚动轴承动力学分析认为滚动体/保持架兜孔间隙比保持架/引导边间隙小,则保持架会出现涡动。由于接触区的摩阻力系数、混合润滑膜的刚度与阻尼随载荷、温度和润滑剂流变特性等参数变化以及转移膜特性,仍有待进一步研究。要实现滚动轴承设计中参数优化,必须建立自己的轴承动力学分析软件包,以现有设计数据为基础建立轴承产品的优化设计数据库。     

Vibration response of rigid rotor in unloaded rolling element bearing

Rolling element bearings appear in nearly 90% of all rotating machinery. Their dynamic performance is often the limiting factor in the performance of the machines that use them. The specific construction of a bearing has a decisive influence on its dynamic behaviour. The paper defines a new vibration model of a rigid rotor supported by rolling element bearings. By application of the defined model, the parametric analysis of the influence of internal radial clearance value and number of rolling elements influence on rigid rotor vibrations in unloaded rolling element bearing was performed. The defined vibration model and parametric analysis were verified experimentally. The results of experimental analysis are also presented in this paper.     

弹流润滑高速角接触球轴承旋滚比分析

为了提高主轴轴承的高速性能,提出弹流润滑高速角接触球轴承的数学计算与分析模型.针对实际生产工况建立弹流润滑高速角接触球轴承分析计算模型.并将弹流润滑高速角接触球轴承的旋转打滑分析转化为旋滚比的分析.通过计算与分析,得出弹流润滑高速角接触球轴承在不同工作条件下或选用不同轴承参数时,轴承旋滚比的变化规律及旋滚比与各参数之间的关系.为实际生产中高速角接触轴承的选择使用和轴承的参数优化设计提供了理论依据,并为机床高速主轴用支撑轴承的设计与优化提供分析计算模型.     

Numerical Analyses of Hydrodynamic Lubrication and Dynamics of the Rolling Piston and Crankshaft in a Rotary Compressor

In this article, numerical analyses of hydrodynamic lubrication and dynamics of the crank, rolling piston, and vane were carried out to study the tribological performance of a rotary compressor. Dimensionless Reynolds equations of journal and thrust bearings in dynamic load condition were derived and solved numerically. To deal with the lubrication of the rolling piston, the effect of the nonuniformity of tangential velocity over the bearing surface on the Reynolds equation was taken into account. In addition, combined with the analyses of dynamics and kinematics of the crank, piston, and vane, the angular velocities of the crank and piston as well as the motion mode between the piston and vane were studied. Analysis results illustrate characteristic oil film pressure distributions of the crank and piston bearings, which are different from that of common journal bearings. Under the influences of dynamic load and eccentricity of the cam, the wedge effect as well as the stretch and squeeze effect contribute greatly to hydrodynamic pressure. The relative motion mode between the piston and vane tip is not always pure sliding but accompanies rolling in some cases, which depends on the magnitude of the friction coefficient between the piston and vane tip. The analysis results are helpful for the improvement of rotary compressor design.     

滚动轴承动力特性测试方法

轴承的动力特性对转子－轴承系统的动力特性有重要的影响。但至今，滚动轴承的动力特性仍缺乏系统的资料，在许多情况下，将滚动轴承简化为无阻尼的定常弹性元件。本文分析了滚动轴承动力特性的主要影响因素，介绍了滚动轴承动力特性的两种测试方法，并以某航空轴承为例作了具体测试，取得了比较一致的结果。本文提出的方法可作为建立滚动轴承动力特性数据库的基本手段。     

基于旋滚比的电主轴轴承预紧力优化研究

为研究不同工况下轴承预紧力对电主轴轴承动力学的影响规律,基于外轨道控制理论,建立了一种以旋滚比可优化的轴承预紧力动力学模型。通过分析高速状态下滚动体载荷和特征参数动态变化过程,构建综合考虑滚动体滚动、自旋转、陀螺运动和离心力的轴承动力学分析模型,在此基础上,计算旋滚比动态变化结果;研究Jones发现的阈值与旋滚比之间的动态定量映射关系;以轴承滚动体打滑状态为优化目标,使用MATLAB仿真分析不同工况下轴承最佳预紧力。建模分析表明,轴承旋滚比大小可以反映轴承预紧效果,也可实现轴承预紧力动态定量优化。     

Lubrication Performance of Connecting-Rod and Main Bearing in Di erent Engine Operating Conditions

Only the lubrication performance at rated engine operating condition was generally analyzed in current design and research of engine connecting-rod and main bearing. However, the actual engine(especially vehicle engine) does not always operate in rated operating condition and its operating condition changes constantly. In this paper, a fourstroke four-cylinder engine is taken as the studying object, the load and lubrication of connecting-rod and main bearing in di erent operating conditions are analyzed. The load of connecting-rod bearing is calculated by the dynamic calculation method, the loads of all main bearings are calculated by the whole crankshaft beam-element finite element method, and the lubrication performance of connecting-rod and main bearings are analyzed by the dynamic method. The results show that there are major di erences in the changes and numerical value at corresponding moment of the loads and lubrication performance of connecting-rod and main bearings in an engine operating cycle in di erent engine operating conditions; the most unfavorable case of the lubrication performance of connectingrod and main bearings may not take place in the rated engine operating condition. There are also major di erences between the lubrication performance of connecting-rod bearing and that of main bearing and between the lubrication performances of main bearings one another. Therefore, it will not be reasonable that the lubrication performance of a certain connecting-rod bearing or main bearing is analyzed in the design of the engine bearing. It is necessary to analyze simultaneously the lubrication performances of all bearings in di erent engine operating conditions.     

滚动轴承的磁流体密封及其性能

利用磁性流体良好的润滑和自密封性能，选择饱和蒸气压极低的基液和分散剂，使磁性流体达到极低的蒸发性能，将其应用到高真空洁净环境中的滚动轴承上。经动力学分析，效果良好，与陶瓷氮化硅轴承及聚四氟烯涂膜的轴承相比，有良好的性价比。