共查询到19条相似文献,搜索用时 109 毫秒
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本文对于由成败型单元和指数寿命型单元组成的串,并联系统进行综合。文中研究了Bayes-Easterling高阶逼近方法,进行了误差分析,所提出了的方法,可用于特高可靠性下的复杂系统可靠性评估。 相似文献
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陈鍊 《数学的实践与认识》2008,38(6):85-93
为了对信息系统安全等级评估,以物元分析的物元为系统观点,以灰色系统的综合评判为系统方法,提出物元评判算子ME和灰类物元综合评判算子GME,并以此改造层次分析法AHP成为层次化灰类物元综合评判GMHE方法,该方法将人为定性评估与数学定量计算有机结合,不仅可以有效解决大型复杂系统的分类评判,而且还能给出评判结果的可信程度. 相似文献
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为了准确评估制造型中小企业的综合质量水平并解决其生产经营管理中存在的问题,文章提出基于组合赋权VIKOR法的中小企业综合质量评估方法.参照质量管理体系要求,结合制造型中小企业的特点,设计了包含质量认证、质量监管、创新及发展能力、财务质量、社会声誉五个维度的综合质量评估指标体系,并使用改进后的信息重叠指标筛选方法优化指标;结合AHP和CRITIC法进行指标权重赋值,并应用VIKOR法计算中小企业利益比率值,实现中小企业综合质量评估.选取电子行业119家中小企业为例,采用文章提出的综合质量评估方法进行实证研究,研究结果表明基于文章提出的综合质量评估方法的结果与样本企业质量发展的客观现状具有良好的一致性,验证了文章方法的有效性. 相似文献
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通过对工艺要素、工艺过程、工艺输出参数、性能参数和产品可靠性等的影响分析,建立了多参数多工序工艺系统可靠性影响关系模型;基于制造质量和生产效率两个维度,提出了多参数工艺系统故障判据与工作能力状态准则;分串联、并联和混联三种模式,建立了多工序工艺系统可靠性逻辑框图;考虑设置检验和不设置检验两种状态,研究了基于无故障概率的多参数多工序工艺系统可靠性评估方法、数学表述和算例. 相似文献
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冷备系统可靠性评定的统计方法 总被引:5,自引:0,他引:5
贮备是提高系统可靠性可行且有效的途径.关于冷备系统的可靠性评定问题,前人仅在设备均为指数型部件的情况给出了WCF方法.文中对实际中常用的指数-威布尔混合型冷备系统,提出了两种可靠性评定方法:WCF方法和Fiducial方法,并在中小样本下对两种方法进行了模拟研究,说明了这两种方法的实用性. 相似文献
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商业智能(BI)系统能够帮助企业经营者进行智能化的决策,但在一个日益复杂的企业运营环境中,BI系统的实施如同ERP系统一样,面临着巨大的问题、压力和高风险.针对以上特性,提出了一种BI项目实施风险扰动模糊综合评价模型和方法,以上海新媒体A公司的BI项目为实例对企业BI项目实施中的各相关风险因素进行了分析,最优判别,得出了导致风险的主要因素,同时为BI实施风险规避策略提供科学依据. 相似文献
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Among recent system models, one specific type of system is generally used to model the dependence among components. Components are connected parallel in such systems as they fail one by one and are supposed to share the system work load. The model is thus referred to as the load‐sharing system model. Despite the availability of extensive reliability assessment methods for different systems, load‐sharing systems have not received enough attention from the scholars who have studied reliability assessment so far. Load‐sharing systems are generally designed for high levels of reliability. Therefore, tests for such systems can be expensive and time consuming. Limitation on resources always leads to small test sample sizes. This increases the difficulties associated with obtaining an accurate and robust system reliability assessment result. This paper proposes a novel assessment method for a certain type of load‐sharing system with components following exponential lifetime distributions. Based on the parameter estimation of the system reliability model, we introduce the Winterbottom‐Cornish‐Fisher asymptotic expansion method for implementing a correction of normal approximation. We demonstrate the accuracy of our method through a series of examples and simulation studies. 相似文献
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签派可靠度是表征民用飞机可靠性的关键参数,本文以签派可靠度为顶层指标,根据民用飞机的设计需求和运行任务分析,结合民用飞机的设计特点,建立民用飞机可靠性参数体系,形成可用性、维修性、安全性3个主要一级指标和11个二级指标.应用改进的层次分析法即在层次分析法的基础上融合了聚类分析的思想,并与每位专家所构建判断矩阵的一致性程度结合起来,精确量化了各个二级指标的权重,对民用飞机可靠性影响较大的二级指标,依次为平均故障间隔时间、平均修复时间、飞行事故率.根据民用飞机可靠性的得分区间,利用模糊综合评价法针对A320机型进行了实例验证,最终实现民用飞机主流机型可靠性的评估,研究结果表明只有提高民用飞机的维修性,加强安全性,才能增强民用飞机的可靠性水平. 相似文献
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The Cross Entropy method has recently been applied to combinatorial optimization problems with promising results. This paper
proposes a Cross Entropy based algorithm for reliability optimization of complex systems, where one wants to maximize the
reliability of a system through optimal allocation of redundant components while respecting a set of budget constraints. We
illustrate the effectiveness of the proposed algorithm on two classes of problems, software system reliability optimization
and complex network reliability optimization, by testing it on instances from the literature as well as on randomly generated
large scale instances. Furthermore, we show how a Cross Entropy-based algorithm can be fine-tuned by using a training scheme
based upon the Response Surface Methodology. Computational results show the effectiveness as well as the robustness of the
algorithm on different classes of problems. 相似文献
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用动力系统描述湍流的主要困难是:如何建立无限维连续介质系统与低维动力系统的联系与确定湍流的空间结构.本文综述复杂系统低维描述的各种方法以及解决湍流问题的新途径. 相似文献
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分析了建设项目现有评标方法,根据已有文献资料和评标办法建立了综合评估法评标指标体系.引入区间数排序可能度法的基本原理,建立了工程项目综合评估法模型.首先运用AHP法确定各指标的权重,根据各评标专家给出的区间数建立初始决策矩阵;然后按照区间数运算法则确定各投标文件的综合评标值,并由投标文件可能度矩阵的排序向量确定中标人.最后,举例应用了该模型,表明了模型的实用性和可操作性. 相似文献
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复杂系统平均寿命综合评估方法研究 总被引:1,自引:0,他引:1
提出了一种利用复杂系统组成设备的试验信息,对复杂系统平均寿命进行综合评估的方法.同时还给出了设备级试验数据具有删失情况下的数据转化方法及设备级可靠度的评估方法.最后,通过计算机模拟对所提供方法进行了验证. 相似文献
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Phased mission systems (PMSs) like satellites and spacecraft perform their functions over non-overlapping mission periods, called phases. One of the challenges in assessing reliability of PMSs comes from considering the s-dependence among phases, and the consideration on the multi-state behavior of components and systems makes the reliability analysis even more difficult. To effectively address this problem, a multi-state multivalued decision diagram algorithm for PMS and a multi-state multi-valued decision diagram model for phased mission system (PMS-MMDD) method is developed for the reliability modelling of non-repairable multi-state components. Based on the Semi-Markov process, a Markov renewal equation-based method is developed to deal with non-exponential multi-state components and a numerical method, the trapezoidal integration method, is used to compute the complex integrals in the path probability evaluation. A case study of a multi-state attitude and orbit control system in a spacecraft is analyzed to illustrate the proposed PMS-MMDD model and the Markov renewal equation-based evaluation method. The accuracy and computation efficiency of the proposed method are verified by the Monte Carlo simulation method. 相似文献