System Reliability Analysis Method Based on T-S FTA and HE-BN

For high-reliability systems in military,aerospace,and railway fields,the challenges of reliability analysis lie in dealing with unclear failure mechanisms,complex fault relationships,lack of fault data,and uncertainty of fault states.To overcome these problems,this paper proposes a reliability analysismethod based on T-S fault tree analysis(T-S FTA)and Hyper-ellipsoidal Bayesian network(HE-BN).The method describes the connection between the various systemfault events by T-S fuzzy gates and translates them into a Bayesian network(BN)model.Combining the advantages of T-S fault tree modeling with the advantages of Bayesian network computation,a reliability modeling method is proposed that can fully reflect the fault characteristics of complex systems.Experts describe the degree of failure of the event in the form of interval numbers.The knowledge and experience of experts are fused with the D-S evidence theory to obtain the initial failure probability interval of the BN root node.Then,the Hyper-ellipsoidal model(HM)constrains the initial failure probability interval and constructs a HE-BN for the system.A reliability analysismethod is proposed to solve the problem of insufficient failure data and uncertainty in the degree of failure.The failure probability of the system is further calculated and the key components that affect the system’s reliability are identified.The proposedmethod accounts for the uncertainty and incompleteness of the failure data in complex multi-state systems and establishes an easily computable reliability model that fully reflects the characteristics of complex faults and accurately identifies system weaknesses.The feasibility and accuracy of the method are further verified by conducting case studies.

基于T-S模糊故障树的制动系统可靠性分析

为解决动车组制动系统由于工作条件多样及内部结构复杂而呈现出的多故障状态以及故障机理模糊、故障关系不确定等问题,应用T-S模糊故障树的逻辑关系明确且可处理事件的不确定能力,结合基于信心指数修正的专家调查法,进行制动系统模型构建及重要度计算。得出了动车组制动系统薄弱环节,可为系统检修提供参考。

故障树分析法在注塑机液压系统维修中的应用

介绍了注塑机的液压控制原理和动作过程,利用故障树分析法,通过逐层分析及故障之间的逻辑关系,对注塑机的系统故障进行了诊断。实践证明,应用故障树分析法对注塑机等复杂设备进行故障诊断,其速度快、效率高,并可以用来预测和诊断故障、指导设备的正常运行和预防性维保。

基于虚拟仪器综导显控台故障检测方法的研究

综导显控台是一种十分重要的航海装备,论文针对基于虚拟仪器综导显控台的故障检测方法展开研究,结果表明该研究成果具有较强的实用性,实现了故障检测智能化,故障排除程序化。

砂型铸造爆炸风险分析及其控制措施探讨

铸造爆炸事故的发生归根到底是因为地坑中多余的水,其爆炸现象主要表现为沸腾液体扩展蒸汽爆炸。铸造爆炸事故往往会造成重大人员伤亡和财产损失。在分析砂型铸造主要工艺的基础上,首先分析了砂型铸造过程中的呛爆风险因素。从气化、增压、侵入、喷出四个环节分析了呛爆的形成过程及其危险以及地坑积水爆炸的形成过程。然后,利用事故树分析法,对砂型铸造中因地坑积水爆炸事故进行了深入细致分析。最后,根据风险分析结果,从地坑造型安全、砂型铸造过程防爆、设计地坑积水量监测系统三个方面提出了砂型铸造爆炸预防与控制技术措施。