高速主轴滚子轴承动态摩擦力矩测试装置研究

高速主轴滚子轴承运行时,其内部的动态摩擦力矩是决定轴承摩擦磨损、发热、温升及寿命等高速性能的关键技术参数之一。利用平衡力矩法原理,针对滚子轴承的具体结构特点和运行条件,研制一种高速主轴滚子轴承动态摩擦力矩测量试验机。该试验机可以在轴承不同游隙、不同转速、不同载荷等工况条件下进行动态摩擦力矩的测试,也可以用于监测轴承全寿命周期内各个阶段的动态摩擦力矩变化情况。该试验机测试结果与文献模型计算结果具有很好的一致性,验证基于平衡力矩法的原理测量高速主轴滚子轴承的动态摩擦力矩是可行的。     

微型轴承动态摩擦力矩试验机的研制

针对微型轴承动态摩擦力矩极小、影响因素多、难以准确和长时期测量的问题,根据平衡力矩法的测试原理,利用高速电主轴驱动技术和采用精密天平测试技术,研制一种微型轴承动态摩擦力矩试验机。该试验机具有对轴承施加轴向预载荷、径向载荷、实时调整转速等功能,可以真实模拟微型轴承的具体工况,进而可以测得不同工况条件下运转过程中轴承内部的动态摩擦力矩。经实际试验和使用证明,该试验机简单有效、测量精度高,可以长时间进行测量,适合用于模拟分析不同工况条件下以及整个寿命周期内轴承内部的动态摩擦力矩。     

基于GBM(1,1)的大型滚动轴承摩擦力矩动态评估与预报

利用基于灰预报和自助再抽样建立的动态评估模型GBM（1,1）,对大型滚动轴承摩擦力矩进行分析研究,GBM（1,1）模型对样本的概率分布和趋势项的类型没有任何要求,在平均不确定度为最小情况下,可有效分离趋势项。该模型利用估计真值、估计区间和动态不确定度3个指标对滚动轴承的摩擦力矩基本特征进行全面描述。     

滚珠丝杠副摩擦力矩动态测量系统设计

介绍了滚珠丝杠副摩擦力矩动态测量系统的设计,包括系统方案,测量原理,软件流程和数据处理与分析等,并给出了HJG-S系列滚珠丝杠副动态摩擦力矩的测试结果。该系统测量可靠,实用性强,已在陕西汉江机床有限公司稳定运行。     

一种基于LabVIEW的灵敏轴承动态摩擦力矩采集系统

针对现有轴承动态摩擦力矩测量仪进行了硬件部分升级和软件开发,通过对原有仪器的改进达到对动态摩擦力矩高速采集、存储、简单分析,对下一步开发诊断系统打下基础。该系统使用了虚拟仪器的技术,方便了对其维护、扩展和升级。     

风电机组变桨轴承摩擦力矩特性的实验研究

变桨轴承是风力发电机组中最关键的零部件之一,而轴承摩擦力矩则是影响变桨轴承运行性能的重要因素。介绍了一种风机变桨轴承摩擦力矩特性检验的方法,主要用于在地面实验室模拟风力发电机组实际运行中变桨轴承所承受的各种载荷,检测风力发电机组变桨轴承的摩擦力矩。     

尺寸误差对转子系统摩擦功率影响的实验研究

针对滑动轴承转子系统存在的尺寸误差,设计加工了滑动轴承系统实验平台,开发了基于LabVIEW软件平台的非线性动力学特性分析系统,描述了相应信号处理、模块设计的工作原理,分析了轴承宽度,轴承直径和轴颈直径的尺寸误差对摩擦功率损失的影响,并进行相应的能量损失实验研究。实验结果表明各种尺寸变化对系统会产生不同程度的影响,验证了尺寸误差对转子轴承系统摩擦功率的影响实验与理论结果的一致性。为转子系统参数及其公差设计,降低能耗,提供了理论依据。     

水润滑橡胶轴承的摩擦实验研究

首先通过标准摩擦磨损实验机得到了湿润滑条件下橡胶对钢摩擦副的有关摩擦学参数,探索了湿润滑条件下载荷和速度对摩擦系数的影响.然后对干摩擦、湿润滑和完全水润滑条件下的摩擦系数进行了对比分析.     

Positioning error improvement based on ultrasonic oscillation for a linear motion rolling bearing during sinusoidal motion

Friction can be a major disturbance to precision positioning. This study presents a method for improving positioning error in a linear motion rolling bearing based on ultrasonic oscillations. Experiments were conducted in which a single-axis linear motion rolling bearing was driven in a sinusoidal motion to simulate circular motion. Two ultrasonic actuators excited both the rail and the carriage of the guide to create relative displacements between raceways and rolling elements. The carriage of the linear motion rolling bearing was driven by a frictionless voice coil motor (VCM). The displacement of the carriage and the friction force were measured by a springless linear encoder and the VCM's current, respectively. The early stages of the experiments focused on several oscillating patterns, and their consequent impacts on positioning error during sinusoidal motion were investigated. Finally, the oscillating pattern that maximally improved the positioning error was proposed and tested. By applying the proposed pattern, the maximum displacement error, exhibited just after velocity reversal, was reduced by approximately 40%, while the average error was reduced by 26%.     

滚动轴承的正确使用与维护

滚动轴承是机械中最常用到的标准零件之一,常用来承受转轴上的负荷,也是易损元件之一.文章从安装、使用、维护等方面提出了如何正确使用和维护滚动轴承.     

滚动轴承振动的监测与诊断技术

本文介绍滚动轴承振动的监测原理和监测方案,介绍了采样定理和数据处理方法,最后给出实验结果和分析。     

基于神经网络的滚动轴承故障诊断方法的研究

神经网络是一种具有非线性映射能力强以及自学习、自组织、自适应等优点的智能方法,非常适合于滚动轴承的故障诊断。针对滚动轴承是机械设备重要的易损零件之一,大约有30%的故障是由轴承损坏引起的,提出了基于神经网络的滚动轴承故障诊断方法。以滚动轴承小波分解后的能量信息作为特征,通过神经网络作为分类器对滚动轴承故障进行识别、诊断。实验表明,该方法对于滚动轴承的故障诊断具有良好的效果和应用价值,并可方便地推广到其他类似的诊断领域。     

滚动轴承动力学仿真与分析

为研究滚动轴承的动态特性和振动特性,在ANSYS/LS-DYNA中建立了滚动轴承有限元模型,对外圈固定,内圈施加压力和转速,实现了滚动轴承的显式动力学仿真,得到了滚动轴承的应力分布和动态响应。仿真结果表明,滚动轴承最大应力出现在滚动体与内圈和外圈接触处,滚动体的最大线速度和最小线速度分别出现在滚动体与内圈和外圈接触点上,滚动体受到的应力最大,保持架的应力变化最为剧烈。     

滚动轴承CAD自动校核程序开发

分析了有任意数量和任意种类的传动件工作的条件下，左右轴承所受到的径向力和轴向力，可对滚动轴承自动进行寿命校核和选型设计。     

Influence of grease rheology on thrust ball bearings friction torque

The friction torque and the operating temperatures in a thrust ball bearing were measured for seven different types of greases, including three biodegradable greases having low toxicity. These friction torque tests were performed using a modified Four-Ball machine.Rheological evaluations of the lubricating greases were made using a rheometer. Bleed oils were extracted from the greases and the dynamic viscosities were measured.In order to compare the performance of the lubricant greases in terms of friction, the grease characteristics were related to experimental results, showing that the interaction between thickener and base oil have strong influences in the bearing friction torque.     

标准构件式滚动轴承CAPP开发工具的研究

论述滚动轴承CAPP开发工具———NDCAPPDT,提出基于标准构件的CAPP开发工具设计思想,并结合生产实际,给出滚动轴承CAPP系统的标准构件,这些构件可用于滚动轴承CAPP实用系统的生成。     

Nonlinear dynamic characteristics of geared rotor bearing systems with dynamic backlash and friction

Effects of the friction and dynamic backlash on the multi-degree of freedom nonlinear dynamic gear transmission system, which incorporate time varying stiffness, are investigated. Firstly, the relationship between gear central distance error and backlash is deduced and the dynamic backlash is defined, subsequently a multi-degree of freedom nonlinear dynamic gear transmission system is developed with dynamic backlash, friction and time varying stiffness. The nonlinear dynamic system is solved by the Runge-Kutta method. The results show that the friction force may enlarge the displacement magnitude and affect the high frequency parts significantly in frequency domain at low speed. But the RMS of the steady response is reduced on the effect of friction. The difference between the constant backlash and the dynamic backlash models is also discussed. The system may enter into previous chaotic motion due to the effect of dynamic backlash. Finally, no impact motion, single-side impact motion and double-side impact motion are also predicted in the new dynamic backlash model.     

机车滚动轴承专业化集中修理点规模的估算

针对机车滚动轴承使用寿命浪费的问题,导出了机车滚动轴承损伤量与再生选配率的关系,并运用线性回归理论对机车滚动轴承的再生选配率进行回归分析,由分析结果估算出了机车滚动轴承专业化集中修理点的规模.