简介:故障的产生和传播是一个动态的过程,具有突发性、并发性和随机性等特点,精确的推理方法难以有效地对复杂特性的故障进行诊断。利用模糊Petri网对舰炮武器系统进行故障分析,首先分析舰炮故障类型以及故障的规则表示形式,然后给出了基于模糊Petri网的故障传播模式模型及其推理算法,最后以某舰炮武器系的弹药盘点异常故障为例进行了建模并用推理算法计算故障发生概率。结果表明,该模型具有直观和表达能力强的优点,可应用于工程实践。
简介:设G是一个图,f是从V(G)∪E(G)到集合C的一个映射,如果f满足相邻点染色不同,相邻边染色不同,任意一个点与其关联的边染色不同,则称f是图G的全染色。针对此概念研究了路的广义Mycielski图的全染色。
简介:研究了一致连续广义Φ-伪压缩映射的不动点收敛定理.该定理中不要求Φ(t)为严格递增函数且对实序列的条件做了相应地放宽,从而所得结果推广和改进了已知的结论.
简介:Classicalnetworkreliabilityproblemsassumebothnetworksandcomponentshaveonlybinarystates,fullyworkingorfullyfailedstates.Butmanyactualnetworksaremulti-state,suchascommunicationnetworksandtransportationnetworks.Thenodesandarcsinthenetworksmaybeinintermediatestateswhicharenotfullyworkingeitherfullyfailed.Asimulationapproachforcomputingthetwo-terminalreliabilityofamulti-statenetworkisdescribed.Two-terminalreliabilityisdefinedastheprobabilitythatdunitsofdemandcanbesuppliedfromthesourcetosinknodesunderthetimethresholdT.Thecapacitiesofarcsmaybeinastochasticstatefollowinganydiscreteorcontinuousdistribution.Thetransmissiontimeofeacharcisalsonotafixednumberbutstochasticaccordingtoitscurrentcapacityanddemand.Tosolvethisproblem,acapacitatedstochasticcolouredPetrinetisproposedformodellingthesystembehaviour.Placesandtransitionsrespectivelystandforthenodesandarcsofanetwork.Capacitatedtransitionandself-modifiedtokencolourwithrouteinformationaredefinedtodescribethemulti-statenetwork.Bythesimulation,thetwo-terminalreliabilityandnodeimportancecanbeestimatedandtheoptimalroutewhosereliabilityishighestcanalsobegiven.Finally,twoexamplesofdifferentkindsofmultistatenetworksaregiven.