共查询到18条相似文献,搜索用时 171 毫秒
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提出了滚动轴承寿命试验的数据处理方法和应用回归法确定轴承S-N疲劳曲线的方法,在假定轴承的疲劳强度分布与其寿命呈Weibull分布的基础上,根据应力-强度干涉模型推导出计算轴承承受应力分布为正态,阶梯形,线性及余弦等不同形式的随机载荷下的可靠度公式,并举例进行了演算。 相似文献
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介绍了用计算机程序来实现轴承寿命实验数据处理的方法.通过对寿命数据进行参数估计和分布拟合的K—S检验,证明用三参数Weibull分布来拟合轴承寿命分布,效果比较理想. 相似文献
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对猝死轴承试验蒙特卡洛模拟与序贯试验及修正序贯试验的轴承综合寿命、累积试验时间和日历时间等进行了比较。轴承寿命L10和Weibull斜率e是随失效轴承的数量而变化,与使用的试验方法及所试验轴承的总数量无关。与修正序贯试验相比。猝死试验在减少轴承试验时间或日历时间方面并不是更有效的方法。 相似文献
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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。 相似文献
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发展了基于两参数Weibull分布的概率疲劳S-N曲线模型及构建方法,用于描述随机滚动接触疲劳应力幅-寿命关系。除考虑数据分散性的统计分布规律外,模型还考虑样本数量相关的寿命置信度预测效应, 引入最小正态寿命的置信下限评价。Weibull分布的尺度参数和形状参数,寿命置信度评估参数,以及概率S-N曲线的指数,全部由试验数据来确定。G20CrNi2Mo轴承钢的滚动接触疲劳试验数据的分析证实所提出方法的可应用性。并且证实该滚动接触疲劳寿命的分布规律,宜采用包括Weibull分布在内的有偏统计模型来描述。 相似文献
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A study on the life distribution and reliability for a roller guide with cage was carried out with a total number of 90 test samples in two lots (N s = 38 and 52), and different fatigue life distribution functions, such as the two and three parameter Weibull distributions, and the log-normal distribution were used for analyzing the test data. The basic dynamic load rating formula standardized by ISO in 2004 was also compared with the life test data in relation to the effect of crowning on both ends of the carriage raceway. This study revealed the following: (1) the best fit for the life test data was achieved by the three-parameter Weibull distribution with the third parameter being the minimum life γ, using a Weibull slope of m = 27/20, and a load life exponent of 10/3. The log-normal distribution came second, and the two-parameter Weibull distribution third. (2) The test data did not fit with the two-parameter Weibull distribution using a Weibull slope of 9/8, which had been used in the ISO linear bearing standard. (3) Fatigue failure on the roller guide was initiated near the starting points of the crowning on both ends of the carriage raceway. Almost 70% of the test specimens were found to have uneven and inclined contact situations with the rollers. (4) The basic dynamic load ratings evaluated theoretically fit well to the life test results, while the λ b m factors were also observed to fall within a suitable value range. 相似文献
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Probabilistic stress-life (P-S-N) studies using alternating torsion life test were conducted with the bearing steel JIS SUJ2/AISI 52100 having a hardness range of Rockwell C scale of 58-62 HRC to determine the existence of a fatigue limit for this through-hardened steel. One hundred and fifty (150) alternating torsion tests were performed at six torsion maximum shear stress amplitudes of 0.5, 0.63, 0.76, 0.80, 0.95, and 1.0 GPa. The number of specimens that were run at each stress amplitude varied from 19 to 33. There is no observable fatigue limit for JIS SUJ2/AISI 52100 bearing steel. On log-log plotted data, life is linear and is inversely proportional to shearing stress to a 10.34 exponent. The failure mode of the experiment is due to the conjugate tensile and compressive alternating stresses in accordance with alternating shearing stresses. The three-parameter Weibull life distribution function with a constant value of the Weibull slope m = 3/2 was found to have the best conformity followed by the log-normal distribution and the two-parameter Weibull distribution function. The shear stress-life exponent (A = 10.34) for JIS SUJ2/AISI 52100 bearing steel was independent of the Weibull slope. 相似文献
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为研究汽车轮毂轴承的寿命与可靠性之间的关系,首先,建立了轴承各元件基于二参数威布尔分布的寿命一可靠性模型,并在此基础上,建立了串联系统的轴承可靠性模型;然后分析了威布尔分布定时截尾有失效数据和无失效数据的参数估计方法;最后,给出算例验证了模型的可行性。研究结果表明,在可靠度要求不太高的情况下,与传统模型相比,其寿命预测更准确。 相似文献
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Tibor Tallian 《摩擦学汇刊》2013,56(1):183-196
A composite sample of over 2500 rolling element bearing fatigue failures is examined for fit of the standardised lives to a Weibull distribution with zero lower bound. Good fit is confirmed in the most used cumulative failure probability region between 10% and 60%. Outside this region, experimental life is larger than the Weibull prediction. A short but finite minimum life appears to exist. The excess of experimental over Weibull life is analysed by evaluating the mathematical conditions assuring validity of a Weibull representation. The inapplicability of asymptotic theory to late failures is suggested. A two-phase fatigue mechanism of crack initiation and propagation is outlined which serves to explain excess life in the early failure region. Data presented can be used to improve the accuracy of life estimates in the early failure region. 相似文献
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为在短时间内获得高频轻载自润滑关节轴承的寿命信息,通过增大载荷的方式建立了加速寿命试验模型,进行了2组恒定应力加速寿命试验。采用韦布尔分布对关节轴承寿命进行描述,并借助最小二乘法对韦布尔分布函数的2个参数进行估算,确定出关节轴承可靠性寿命的相关指标,最终计算出基准载荷下关节轴承的可靠性寿命。数据统计结果表明,关节轴承的寿命服从韦布尔分布,其加速模型符合逆幂律关系,从而验证了在不改变失效机理的前提下对高频轻载自润滑关节轴承进行载荷应力加速寿命试验的可行性,极大地提高了产品寿命的预测效率。 相似文献
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本文在假设轴承钢的接触疲劳寿命服从三参数威布尔分布的基础上提出了滚动轴承的高可靠寿命的理论计算方法,对3种型号共164套圆锥滚子轴承的可靠性试验结果分析表明,其实际高可靠寿命与用本文提出的方法直接计算的结果基本相同。 相似文献