After then , a new method of solving the minimal cuts of s - coherent tree based on bdd and prime number was given in the qualitative analysis of fta based on bdd , the prime implicant sets of non s - coherent tree was calculated by an iterative method 再次，在基于bdd的故障树定性分析研究中，提出并实现了基于bdd和素数法相结合的单调关联故障树最小割集求解的新方法，用迭代法实现了非单调关联故障树质蕴含的求解。
To improve the execution performance of wcsg model , all transformation productions , which express executable semantics of wscg model , have been divided into several parallel independent disjoint set , and sequential independent sets for every transformation productions are also defined 论文也通过构造变换产生式集合的并行不相关割集和变换产生式的顺序不相关集合，设计了wscg模型的执行算法，改善执行效率。
The practical situations of system operations are considered in this paper . based on the enumeration of the cut sets for the load point interruption , load transition character , maintenance of devices , active failure mode and overload of transmission line are all discussed 该方法考虑了系统运行的实际情况，列举引起负荷点停电事件割集，还考虑了负荷点供电的转移特性，网络元件的计划检修和主动性故障使评估过程更加合理和有效。
This paper trice to find the cause of effective ness loss and to analyze it theoretically by adopting the ways of quantitative analysis and quantitative analysis by using the way of fault tree to carry out the qualitative analysis , it draws the logic charts by various elements that cause the loss of effectiveness and to make a faucet tree to find out the loss programs , then make a final analysis of the smallest element of the fault tree . the first problem is due to the over friction by exceeding permitted limits ; the second problem is due to the gear feather ' s low inteusity , this paper adopts the method of changing the trans mission ratio of the first gear and the width of the sixth gear of second shaft so as to solve the problems 本文采用定性和定量相结合的方法，利用失效树进行定性分析，它通过对可能造成系统失效的各种因素，画出逻辑框图，从上到下绘成失效树，找出失效谱，并对失效树的全部最小割集进行分析，找出有可能的失效原因，再对其通过理论计算进行定量分析，由此发现第一个问题是由于离合器在极限状况下的滑磨功超过其许用值造成的，第二个问题的原因是二轴六档齿轮强度不足。
Based on knowledge reasoning , fuzzy theory , extraction of sub - assembly and cluster , and hierarchical connection relation graph , an assembly sequence generation algorithm is studied in this paper , which breaks down the original complex assembly sequence generation problem into several small scale assembly sequence planning problems to reduce the computing complexity caused by cut - set theory . a hierarchical and / or graph to store all the generated sequences is also employed for this purpose 本文提出基于知识推理及模糊理论，结合子装配与聚族提取以及装配树，利用层次联接关系图，将一个复杂的装配序列求解问题转化为若干个相关的小规模装配序列求解问题，并用一种层次与或图结构存储装配序列，使割集法求解装配序列的计算复杂度大大降低。
This thesis focuses on techniques of dynamic fault tree in system reliability modeling and its qualitative and quantitative analysis . it studies bdd solution for static sub trees 、 markov chain solution for dynamic sub tree briefly and the modularization of dynamic fault tree ; presents the algorithm for top event occurrence rate of dynamic fault tree based on weibull distribution . then this thesis presents a new approach to solve top event occurrence rate and a new generation algorithm of minimal cut sequence of dynamic fault tree that deviate from markov model completely 本文着眼于动态故障树在系统可靠性建模及定性定量分析中的技术,研究了基于bdd的静态子树分析方法、基于马尔可夫模型的动态子树分析方法以及动态故障树模块化方法,并提出了基于威布尔分布的动态故障树顶事件发生概率计算方法;提出了一种完全脱离马尔可夫模型的求解动态故障树顶事件发生概率的方法和一种最小顺序割集的生成方法。
A lot of papers about the report of probabilistic risk assessment of daya bay npp and system manuals has been read by the author and let as the basis . in this paper , based on the reliability analysis methods of failure mode and effect analysis and failure tree analysis , according to the result of event tree analysis of probabilistic risk assessment report of daya bay npp , the top events of the fault trees of reactor protection system and the success criteria were established . by using risk - spectrum procedure , the unavailability and the minimal cut - sets ( mcs ) of the fault trees were obtained 本文在阅读了大量的大亚湾核电站pra报告和各种系统手册等资料的基础上，采用fmea (故障模式和影响分析)和fta (故障树分析)可靠性分析方法，依据大亚湾核电站pra事件树分析的结果，建立了以紧急停堆失效和专设安全设施驱动失效为顶事件的故障树，利用risk - spectrum程序，对所建的故障树进行定量分析，计算，得到系统故障树的失效概率和最小割集，从而为大亚湾核电站可视化风险分析软件提供数据支持。
The minimum cut set of the fault tree was obtained , the major dangerous factors in the explosion elimination processing of lpg tanks were realized , and the corresponding prevention measures to ensure the safety of the explosion elimination processing were suggested 通过对液化石油气储罐销爆处理过程中潜在危险因素的系统分析，得到了事故树的各阶最小割集，确定了液化石油气储罐销爆过程中的主要危险源，提出了相应的安全预防措施，保证了该化工厂液化石油气储罐销爆过程中的安全。
Many practical factors , such as effects of line fuses protection , disconnected switches , scheduled maintenance , spare electrical source , spare transformers in distribution system , are considered in the assessment arithmetic . in the assessment , it is more practical that low - voltage power system is equivalent to an element on the lateral section of mid - voltage system . especially , the minimal cut - sets are divided into direct cuts and indirect cuts , which makes the effects of elements in cuts on system more legible and exact 算法考虑了分支线熔断器保护、隔离开关、计划检修、备用电源、有无备用变压器的影响，将低压系统等效为中压系统分支馈线上的一个等效元件进行评估，使得该方法更符合实际，特别是，将最小割集分为直接割集和间接割集，使割集元件的影响更加清晰准确，并以c + +语言编制了计算软件。
The paper briefly introduces the basic theory of fault tree analysis and rule - based expert system , and offers to combine fault tree analysis with rule - based expert system . by connecting fault tree to diagnosis knowledge base through cut set , we can express expert knowledge totally , systematically , and logically by building fault tree . it makes automatic knowledge acquisition come true to obtain diagnosis rule base automatically according to the fault tree 本文简要阐述了故障树分析法和基于规则的诊断专家系统的基本原理，提出将故障树分析法与基于规则的诊断专家系统相结合的方法，通过割集将故障树与诊断专家系统知识库联系起来，用建立故障树的形式全面、系统、层次性地将专家知识表述出来，由故障树自动生成基于规则的专家系统诊断规则库，实现了诊断知识的自动获取，并且确保了诊断知识的一致性和完备性。
