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具有指数衰减振荡型概率密度变化规律的产品寿命分布模型 被引量:2
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作者 刘永明 赵帅帅 +2 位作者 赵转哲 陈玉 赵宏伟 《南京航空航天大学学报》 EI CAS CSCD 北大核心 2021年第3期449-454,共6页
传统的机械产品可靠性模型大多忽略了周期性故障引起的概率密度的振荡特征,从而影响了模型的精度。在传统寿命模型的基础上,构建指数衰减振荡分布的可靠性模型及相应的可靠度、失效率以及平均寿命计算模型,并研究衰减系数、振荡幅值和... 传统的机械产品可靠性模型大多忽略了周期性故障引起的概率密度的振荡特征,从而影响了模型的精度。在传统寿命模型的基础上,构建指数衰减振荡分布的可靠性模型及相应的可靠度、失效率以及平均寿命计算模型,并研究衰减系数、振荡幅值和振荡角频率等参数对概率分布特征的影响。运用建立的概率分布模型对某型叉车搭载的液力自动变速箱故障时间数据进行拟合,并与指数分布模型、三参数威布尔模型和"浴盆曲线"模型拟合结果进行对比。对比结果表明,建立的指数衰减振荡分布模型能够较好地描述该液力变速箱的无故障工作时间概率分布特征,并且采用该模型可以获得较小的拟合均方根误差。 展开更多
关键词 可靠性 寿命概率分布 指数衰减振荡 参数估计
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样本容量和分布类型对疲劳寿命分布的推断影响分析
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作者 孙文叶 崔卫民 喻天翔 《机械设计与制造》 北大核心 2009年第9期195-197,共3页
应用蒙特卡罗数值仿真方法,就样本容量及分布类型的选取对产品疲劳寿命概率分布函数推断的影响进行了研究,给出不同样本容量及分布函数类型下,各分布函数通过拟合优度检验被接受作为产品疲劳寿命概率分布函数的概率。还探讨了选取非真... 应用蒙特卡罗数值仿真方法,就样本容量及分布类型的选取对产品疲劳寿命概率分布函数推断的影响进行了研究,给出不同样本容量及分布函数类型下,各分布函数通过拟合优度检验被接受作为产品疲劳寿命概率分布函数的概率。还探讨了选取非真实分布函数作为产品疲劳寿命概率分布函数对累积失效概率的影响,并将对应给定百分位点下,由非真实分布函数求得的累积失效概率与真实累积失效概率进行了对比分析。所得结论对产品的设计和安全性评估均有参考价值。 展开更多
关键词 疲劳寿命概率分布函数 蒙特卡罗 累积失效概率
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Statistical Analysis Methods of Fatigue Crack Growth Rate 被引量:1
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作者 张啸尘 谢里阳 +3 位作者 刘建中 张宇 佟安时 马园园 《Transactions of Tianjin University》 EI CAS 2014年第5期322-327,共6页
The standard center-cracked tensile specimens M (T) with different widths made of aluminum alloy were designed for fatigue crack growth rate experiments, and the effect of specimen size on the fatigue crack growth r... The standard center-cracked tensile specimens M (T) with different widths made of aluminum alloy were designed for fatigue crack growth rate experiments, and the effect of specimen size on the fatigue crack growth rate was discussed. The firing equation and the p-da/dN-△K curve of fatigue crack growth rate (with different confidence and reliability levels) were obtained by one-side tolerance factor analysis. In order to reasonably reflect the dispersion of material properties on the fatigue crack growth rate and fatigue crack propagation life, two novel statistical analysis methods were proposed, which can be used to describe the probability distribution of fatigue crack growth rate. Compared with the traditional statistical analysis method of probabilistic fatigue crack growth rate, the fitted curves from the novel statistical analysis methods yield more objective description on the probability distribution of crack growth rate. 展开更多
关键词 probabilistic fatigue crack growth rate CONFIDENCE RELIABILITY p-da/dN-△K curve fitting
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Fatigue reliability assessment for bridge welded details using long-term monitoring data 被引量:24
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作者 DENG Yang DING YouLiang +1 位作者 LI AiQun ZHOU GuangDong 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第12期3371-3381,共11页
A reliability assessment method of fatigue life based on the long-term monitoring data is developed for welded details in steel box girder,and the application research is presented with examples of welded rib-to-deck ... A reliability assessment method of fatigue life based on the long-term monitoring data is developed for welded details in steel box girder,and the application research is presented with examples of welded rib-to-deck details in Runyang Bridges. Firstly the fatigue damage limit-state function is established based on S-N curves and Miner's rule,and the probability distribution characteristics of the coefficients in the function are discussed in detail. The uncertainties in fatigue loading effects are mainly studied based on long-term monitoring data. In the traditional studies,only the uncertainty of equivalent stress range is considered in fatigue reliability assessment. However,stress cycle number is also treated as a random variable in this paper because we know traffic flow every day differs in a thousand ways. Then the optimization method is employed to calculate the fatigue reliability. After studying the changing law of the reliability indices with time and the effect of the randomness of stress cycle number on reliability,the effect of the traffic growth on the reliability is studied. This study shows that the uncertainty in the fatigue life of the welded details can be well studied based on structural health monitoring,so it is necessary to carry out long-term strain monitoring of the welded details for accurate fatigue reliability assessment during the whole service period. 展开更多
关键词 steel box girder fatigue loading effects equivalent stress range stress cycle number fatigue reliability traffic growth
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