滚动轴承疲劳寿命计算及参数估计

讨论了滚动轴承疲劳寿命的常规计算与可靠性计算的区别和联系，对甲、乙两厂生产的２０３型轴承用参数估计的方法作了质量分析比较。     

滚动轴承疲劳寿命P-S-N曲线

本文在滚动轴承疲劳寿命服从三参数weibull分布的基础上,研究滚动轴承的寿命——负荷关系,绘出了疲劳寿命P-S-N曲线,分析了三个独立参数α、β、ε随负荷的变化规律,并提出了用三多数幂函数形式来表达寿命——负荷关系的可能性。     

滚动轴承疲劳寿命分布指数的验证

以 2 95组 580 0余套国产与国外轴承寿命试验数据为依据 ,对e值进行了验证分析和研究 ,结果是球轴承e =1 .2 9;滚子轴承e =1 .4 9。两相比较 ,球轴承相对偏差为1 6% ,滚子轴承为 3 2 % ,ISO标准推荐值与实测值不能很好吻合 ,有必要依据更多的试验对e值作进一步的探讨与完善。附图 2幅 ,表 3个 ,参考文献 5篇。     

滚动轴承的快速疲劳寿命试验及可靠性分析

介绍６３０８轴承的常规疲劳试验与加速疲劳试验，并根据试验结果和数据的多种方法处理，探索该型轴承疲劳失效的规律。在较大的Ｐ／Ｃ下，用较短的试验时间获得轴承的特征寿命值，来推断常规条件下的轴承特征寿命值，从而能有效地利用试验数据，分析轴承的可靠性。附图１幅，表３个，参考文献８篇。     

滚动轴承疲劳破坏机理和疲劳寿命模型综述

延长轴承疲劳寿命,尤其是滚动轴承的接触疲劳寿命.一直是轴承工作者十分重视的研究课题.本文概括了滚动轴承接触疲劳破坏机理的主要形式和形成原因,总结了不同阶段的滚动轴承接触疲劳寿命计算公式,分析了不同滚动轴承接触疲劳寿命模型的区别.介绍了表面涂层的摩擦学性能在滚动轴承中的应用.     

滚动轴承疲劳寿命的最小寿命研究

以53个基本型号、153组共计2301套轴承的疲劳寿命试验数据为基础，采用将小子样合并为大子样的方法，重点对可靠度大于90％的Weibull分布形状参数b及最小寿命L0进行了分析研究，结论为6=2．0，L0=0．085L10。     

滚动轴承寿命计算方法发展的研究与分析

详细介绍了滚动轴承疲劳寿命的概念,并对滚动轴承疲劳寿命的发展历程进行了详细阐述,分析了各个不同时期寿命计算理论的特点,谨供相关人士参考。     

起重机用滚动轴承有限元分析及故障检测

针对起重机用滚动轴承故障率高且难以检测的问题,首先采用Ansys软件对起重机用滚动轴承进行基于实际接触状态的有限元分析,然后采用基于小波包能量法和Hilbert变换方法对滚动轴承进行信号处理、分析以及故障检测。结果表明:滚动轴承的滚动体与内外圈接触部位存在较大应力集中,最易在此处首先发生破坏;根据轴承故障特征频率与内圈、外圈、滚动体三种故障类型所对应的频谱特征和能量谱相比较,可有效判断轴承故障类型。研究所采用的检测方法可为起重机用滚动轴承的故障预防和检测提供一定理论依据和指导作用。     

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.     

The effect of a solid additive on rolling fatigue life

Behaviour of a series of lubricant oils and the effect of a non stoichiometric inorganic compound, as solid extreme pressure additive, on rolling fatigue life are studied using the rolling four-ball accelerated service simulation test proposed by Barwell and Scott. The results show, in all tested cases, the remarkable efficacy of this type of additive. The Total Acidity Number (tan) was found to increase with performance time for the case of the base lubricant, while for the oils with additives, it remained at its constant low value. This led to a proposal of a possible mechanism of the additive performance in the rolling process.     

谐波齿轮传动柔性轴承疲劳寿命试验装置设计

根据谐波齿轮传动柔性轴承疲劳寿命测试需求,设计了能够模拟实际工作状态的柔性轴承疲劳寿命试验装置,避免了传统采用谐波齿轮传动整机进行试验的方法中,柔轮和刚轮等高成本零件的消耗问题,阐述了模拟试验装置的设计原理和机械系统设计,在模拟试验装置上对3E812KAT2型柔性轴承进行了疲劳试验,验证了试验装置设计原理的可行性。     

滚动轴承疲劳故障在线诊断的研究

通过对滚动轴承振动信号的在线监测提取出对疲劳故障敏感的参数：峭度、功率谱故障频带能量值、小波包故障频带能量值．选择足够的具有代表性的样本数据训练神经网络,用训练好的神经网络进行在线诊断,可以得出轴承发生疲劳故障的程度,再经过共振解调法诊断出轴承具体损伤的元件,实验表明本方法对滚动轴承的疲劳故障能正确诊断。该监测和诊断方法对其他设备的监测和诊断也有重要的意义。     

A finite element model for rolling contact fatigue of refurbished bearings

Bearing refurbishing has become a popular method of extending the life of rolling element bearings. In the refurbishing process the raceways of the bearing may be ground to remove any surface damage prior to repolishing and reassembly with larger sized rolling elements. In the current study a continuum damage mechanics finite element model was developed to quantify the damage in original and refurbished bearings. After calculating the damage accumulation for a set number of contact cycles with the original bearing geometry, refurbishing is simulated by removing a layer of the original surface. The refurbished microstructural model is then subjected to additional computational contact cycles until a fatigue crack reaches the surface, signifying failure. This model preserves the fatigue damage accumulated prior to refurbishing and evaluates its influence on the refurbished bearing fatigue life. All refurbished bearing surfaces showed a significant amount of life after refurbishing with L₁₀ lives from the point of refurbishment, varying from 20% to 94% of the original L₁₀ life. The results indicate that the remaining life of the refurbished bearing population is inversely related to the time before refurbishing and is proportional to the depth of the regrinding. Results obtained from this investigation are in good agreement when compared to the Lundberg-Palmgren bearing life equation modified for analyzing the life of a refurbished bearing.     

基于改进谐波小波包分解的滚动轴承复合故障特征分离方法

为解决滚动轴承单通道振动信号中复合故障特征难以分离的问题,提出了基于改进谐波小波包分解的轴承复合故障特征分离方法。首先,改进了二进谐波小波包分解方法,提出了连续谐波小波包分解方法,克服了信号分解后子带个数和带宽范围受二进制划分的缺陷;然后,采用谐波窗分解提取信号中频率成分集中的频段,根据轴承各单点故障特征频率确定分解层数,进行连续谐波小波包分解,利用能量算子包络解调得到子带信号中各个单点故障的权重因子;最后,重构轴承各单点故障信号,实现复合故障的特征分离和提取。对仿真信号和实测轴承内、外圈复合故障信号分析的结果表明,该方法能将轴承单通道复合故障信号分解到不同的通道中,实现了复合故障特征的分离,具有一定的工程实用价值。     

圆柱滚子轴承内圈冷辗扩过程有限元分析的方法

以圆柱滚子轴承内圈为研究对象,利用Abaqus／Explicit通用有限元程序来模拟冷辗扩过程。而进行有限元分析前处理的工作是运用冷辗扩理论来设计环件的毛坯尺寸及确定其工艺参数,建立符合实际加工有限元模型。     

The effect of a solid additive on rolling fatigue life: Part 2: Behaviour in a water-accelerated test

In this paper, as the second part of another previously published in this journal, the behaviour of a non-stoichiometric inorganic compound (nsic-bp1 additive) in a water-accelerated rolling fatigue test is studied.The results show the remarkable efficacy of the additive against the detrimental action of water present in lubricating oil. The efficacy of additive to inhibit the pernicious effect of water is explained by its reaction capacity.