利用相似产品信息的冷贮备系统可靠性评估

以泊松型部件冷贮备系统为背景,主要讨论了在有继承因子情形下的冷贮备系统的可靠性评估问题.通过引入继承因子,进而得到混合先验分布,然后运用Bayes方法对冷贮备系统的可靠性指标进行估计.最后通过仿真算例对所给方法的有效性进行了验证.     

引信可靠性小样本评估方法研究

研究引信作用可靠性的小样本评估方法.把功能模拟试验信息作为Bayes可靠性评估的先验信息,有效地减少了样本量.针对先验信息的融合问题,采用等效折算和CMSR方法得到系统的等效成败型数据,分析其与靶试数据的联系和差异,推导出继承因子,避免了靶试数据被淹没情况的发生.通过实例,说明了该方法的合理性和可行性.     

无失效数据下一种新分布的可靠性分析方法

根据无失效数据推导出分布失效率的Bayes估计,然后运用Virene算法和非线性回归最小二乘法,对分布的可靠性进行评估.最后,利用Monte-Carlo方法对所得结论进行了分析验证.结果表明,在无失效数据下,将非线性回归最小二乘法与Bayes方法相结合,可以很好地评估指数-威布尔分布的可靠性.     

双参数指数分布场合下无失效数据的可靠性试验

在电器的可靠性指标达到某个给定值的情况下,利用Bayes方法给出电器的寿命服从双参数指数分布场合下无失效数据的可靠性验证试验,并利用相同的分析方法给出形状参数的1-α的Bayes可信上限和形状参数的Bayes估计.最后,结合实例进行了计算,结果表明,利用该估计方法优于经典估计方法.     

Bayes估计在NHPP软件可靠性模型中的应用

软件可靠性是评价软件质量的一个重要指标.针对互不相交的观测区间数据,采用Bayes方法估计软件的可靠度函数,使得对被测软件的可靠性模型更为精确,最后对实际的软件测试数据进行可靠性评估,验证了所提出的估计方法的合理性和可行性.     

火箭弹射座椅Bayes可靠性评估方法

建立了一种综合利用分系统历史信息以及少量座椅试验数据的火箭弹射座椅Bayes可靠性评估方法.利用最大熵方法融合分系统可靠性信息,推导了从分系统可靠性矩到系统可靠性矩的计算公式,最后利用Bayes定理评估系统可靠性.采用该方法对某型火箭弹射座椅可靠性进行了评估,在置信水平0.90情况下其可靠度达到了0.951.结果表明,这种方法是有效的,能在少量的整机试验下,获得对火箭弹射座椅可靠性较为准确的评估.     

表决系统Bayes可靠性评估及其仿真

提出了表决系统Bayes可靠性评估的数字仿真方法。依据表决系统组成的结构特点和系统Bayes可靠性评估的基本原理，在进行单元可靠性评估的基础上，分别运用BayesMC、Bayes bootstrap和double Bayes MC方法进行系统可靠性评估。给出了表决系统Bayes可靠性评估的一般步骤。仿真实例表明了方法的可行性。     

可靠性评估在矿井救灾通信系统设计中的应用

为了实现矿井救灾通信系统可靠性评估,给出了系统可靠性评估结构框图,论证了串联型单元和并联型单元的近似综合及系统评估方式,根据所取得的试验数据对矿井救灾通信系统进行可靠性评估,对实用中系统的可靠性进行了初步验证,结果表明:该方法对矿井救灾通信系统设计具有较好的指导作用.     

发电系统的可靠性改进区间评估

考虑发电系统可靠性原始数据不确定性,本文首先采用数学理论对原始数据进行修正,得到以区间数值表示的修正数据.其次利用概率论和区间运算,对发电系统可靠性进行区间评估,此区间评估方法,更能体现系统可靠性的真实性.最后采用一个三机的算例对所提方法的正确性进行了验证,并与文献对比分析,所求的可靠性区间指标范围减少,可靠性强,计算更快速简便.     

表决系统可靠性指标的近似置信限比较

利用E-Bayes和多层Bayes方法对定时截尾试验数据下表决系统的可靠性指标进行估计,得到了部件失效率、系统可靠性和系统平均寿命的E—Bayes近似置信限和多层Bayes近似置信限,并利用蒙特卡罗方法进行模拟比较,结果表明,多层Bayes方法比E—Bayes方法更具优势．     

Bayesian Assessment for Reliability of Binomial Components Based on Information Fusion of Similar Products

A modified Bayesian reliability assessment method of binomial components was proposed by fusing prior information of similar products.The traditional Bayesian method usually directly used all the prior data,ignoring the differences between them,which might decrease the credibility level of reliability evaluation and result in data submergence.To solve the problem,a revised approach was derived to calculate groups of prior data's quantitative credibility,used for weighted data fusion.Then inheritance factor was introduced to build a mixed beta distribution to illustrate the innovation of new products.However,in many cases,inheritance factor was determined by Chi-square test that could not give out exact result with respect to rare failures.To make the model more precise,Barnard's exact test was suggested being used to calculate the inheritance factor.A numerical example is given to demonstrate that the modified method is successful and rational,while the classical method is too conservative and the traditional Bayesian method is too risky.     

Simulation Evaluation Study of System Reliability Based on Improved BayesBootstrap Method

For the disadvantages of analyzing system reliability using common Bayes method,an evaluation method based on improved Bayes-Bootstrap method is presented.Firstly,the data obliteration problem existing in traditional Bayes method is analyzed,then an improved sampling arithmetic is proposed on the foundation of an experience function.Finally,effectiveness of this method is proved by an example.The simulating result shows that this method is more accurate than common Bayes method.     

含缺失数据时分组数据的AMSAA模型的Bayes分析

针对小子样变总体的含缺失数据时分组数据的AMSAA模型,提出Bayes可靠性增长分析方法,得到模型的参数以及系统能达到的MTBF的Bayes点估计和Bayes区间估计,结合实际例子进行运算.     

“三高”油气井早期溢流在线监测与预警系统

为解决钻井过程中传统溢流监测实时性和可靠性差的问题,设计开发出一套"三高"油气井早期溢流在线监测与预警系统。该系统针对常规单一参数、单一手段溢流监测实时性低、可靠性差的问题,综合应用微流量、随钻压力(pressure while drilling,PWD)以及综合录井3类参数,通过多参数、多手段相互印证的方式提高溢流监测的实时性与可靠性。提出基于专家系统和改进的贝叶斯判别相融合的溢流等钻井事故判别方法:当缺少训练数据时,应用专家系统判别溢流等钻井事故;当训练数据充足时,应用专家系统和改进的贝叶斯判别相结合识别溢流等钻井事故。改进的贝叶斯判别模型对于因属性变量间不独立而引起的误判具有一定的抑制作用,能够提高判别准确度,且训练简单,应用灵活。通过两种算法的有机结合,优势互补,可以提高井控安全的智能化水平与现场适用性。测试实验结果表明,该系统能够实时、有效地监测溢流等钻井事故。     

产品使用可靠性的变点模型及其统计分析

产品使用过程中的变点分析是现场可靠性数据处理时的重要问题,对制定产品维修策略及确定产品报废期具有重要的意义.研究了产品使用可靠性的变点问题,建立了机械类产品的使用可靠性变点模型,给出了变点的检验和估计方法,特别是采用Bayes方法对变点后的可靠性指标进行估计,以提高产品可靠性评估精度.数值模拟表明Bayes方法具有较好的小样本性质,适用于现场可靠性数据的变点分析.     

Reliability Estimation of Aviation Pyrotechnics System Based on Mixed Beta Distribution

For evaluating reliability of an aviation pyrotechnics system,a Bayesian reliability estimation method utilizing reliability information of a system and its units was put forward. Firstly,an inheritance factor was determined by chi-square goodness of fit test.Then the mixed prior distribution was obtained based on the inheritance factor. Finally, the density function of posterior distribution was obtained and used to assess the reliability of system.According to the new method, the reliability of an aviation pyrotechnics system was evaluated to reach 0. 989 6 at the confidence level of 0. 90. To reach the reliability index,the required numbers of trials of system and its units were given. It is instructional to apply the new method on the reliability estimation of aviation pyrotechnics systems.     

估计中模糊先验信息的一类定量描述方法

在Bayes可靠性评估中,为了提高小样本条件下可靠性的精度,需要利用专家经验等信息.而可靠性工程专家习惯于将自己的意见用模糊信息来表述.基于模糊隶属函数,对专家模糊经验信息做出了定量描述,并在此基础上利用Bayes方法实现了语音选择器的专家信息与实验数据的有效融合.实例表明,在专家经验信息的置信区间较宽时,采用三角型模糊分布能有效提高可靠性评估的精度.而置信区间较窄时,正态型分布具有更好的融合效果.     

Reliability Evaluation of CRH_(3C) Brake Pads Based on Bayes Method

In the reliability life evaluation of CRH_(3C) brake pads,the evaluation model of reliability life is put forward based on the Bayes method in the small sample. The correctness of evaluation model is validated by comparing and analyzing with the evaluation results based on Bootstrap simulation. Also by comparing the result with the semi-empirical method,the life evaluation results of the brake pads which are based on the Bayes method are more actual. The results which are based on the Bayes method can provide the theoretical basis and guidance for the repair and replacement of brake pads.