Research and application of hierarchical model for multiple fault diagnosis

1.INTRODUCTION Failureanalysisanddiagnosisoflarge scalesystems havereceivedconsiderableattentionduringtherecent years[1～3].Thesesystemshaveevolvedfromthepre viousonesbasedonheuristicknowledgeofsymptom faultassociationstothemorerecentonesbasedon structure,behaviorandfunctionalityofthedevice andsubsystemtobediagnosed[4].Inthecaseof complexsystem,theapplicationofmodel baseddiag nosisalgorithmsbecomescomputationallyverydiffi cultorevenintractable.Ahierarchicaldiagnosisap proachcansignificant…     

构造应力演化的定量模拟方法

构造应力演化研究是盆地模拟的重要环节，各期次构造应力分布情况决定了油气运移的方向．本文提出的构造应力演化的系统模拟方法，首次将运动学研究和构造动力学模拟有机相结合，由运动学研究提供初始模型和边界条件．排除了边界条件的任意性。耦合自重应力场和构造应力场的综合影响，以苏北溱潼凹陷为例，模拟了该区构造应力演化的发展过程，对油气勘探有重要指导意义。     

点模式识别ANN的区域分划特征

化学工程中许多过程识别问题，可归结为点模式识别，本文以区域分划或覆盖为基础，研究用于点模式识别的ＡＮＮ的性能，提出分划映射的ＡＮＮ表示－σ网络及其学习算法，并建立它的“知识积累”机制－σ网络的序贯学习。     

核电站高压安全注入系练的故障模式分析

高压安全注入系统是核电站专设安全设施的一个组成部分。正常运行时,它是个备用设备,发生失水事故时,可向堆芯注入应急冷却水,以确保核电站安全。本文将故障树分析法和状态枚举法相结合,成功地分析了“伪冗余”系统的故障模式,并利用重复模块分析法、早期不交化和蒙特卡罗法算出高压安全注入系统的无效度及置信区间、各部件的概率重要度和结构重要度。     

Decentralized and overall condition monitoring system for large-scale mobile and complex equipment

It is an urgent project to realize online and overall condition monitoring and timely fault diagnosis for large-scale mobile and complex equipment. Moreover, most of the existing large-scale complex equipment has quite insufficient accessibility of examination, although it still has quite a long service life. The decentralized and overall condition monitoring, as a new concept, is proposed from the point of view of the whole system. A set of complex equipment is divided into several parts in terms of concrete equipment. Every part is processed via one detecting unit, and the main detecting unit is connected with other units. The management work and communications with the remote monitoring center have been taken on by it. Consequently, the difficulty of realizing a condition monitoring system and the complexity of processing information is reduced greatly. Furthermore, excellent maintainability of the condition monitoring system is obtained because of the modularization design. Through an application example, the design and realization of the decentralized and overall condition monitoring system is introduced specifically. Some advanced technologies, such as, micro control unit (MCU), advanced RISC machines (ARM), and control area network (CAN), have been adopted in the system. The system's applicability for the existing large-scale mobile and complex equipment is tested.     

小电网故障定位的研究

关于模拟电路故障诊断的多频率法对小型电网的短路故障及开路故障定位的研究表明,选择适当的测试频率及诊断精度,能准确地诊断出故障点,并可用微机迅速地完成诊断。     

绕组故障时异步电机定子电磁振动频谱的计算

本文阐述在绕组故障和非故障情况下异步电机定子径向电磁振动频谱的计算方法,这一方法可以全面考虑各种气隙磁场谐波的影响,并对一台绕线式异步电机在定子绕组发生相间短路及正常运行时定子电磁振动的频谱作了计算和比较.     

对《鞍山钢铁学院学报》的文献计量学分析

根据文献计量学原理，对《鞍山钢铁学院学报》进行数据统计、分析，以期找出某些特征和规律，为师资队伍建设和教学科研工作提供依据。     

甘肃永昌─独青山地电断面及其地质上的新发现

甘肃永昌─独青山大地电磁测深（ＭＴ）断面可分为４个岩性电性层和两组“构造电性层”，铲状断裂发育，无超壳深断裂。具深、浅双层推覆滑脱构造。金昌硫化铜镍矿床的合矿超基性岩体与深部通道的联系已被错断，是无根的，是推覆滑脱构造由南而北、由深而浅拖带上来的。