Optimal inspection and repair of renewable coherent systems with independent components and constant failure rates

Suppose that a multicomponent reliability system earns revenue while it is working and that it has a finite number of possible failure states (defined as states in which it ceases to work), each with a known prior probability. When the system stops working its components can be inspected one at a time, and, if necessary, replaced or repaired, until the system is restored to its original (operating) state. Inspections (as well as replacements or repairs) are time consuming and expensive. An optimal adaptive inspection strategy for examining and fixing the components of a failed system restores it as efficiently as possible, taking into account the opportunity costs due to lost revenue while the system remains failed as well as the costs and times required for inspections. This article presents exact and heuristic procedures for constructing optimal adaptive strategies for k-out-of-n and general coherent systems. Average revenue per unit time is taken as the maximand for most of the article, but characterizations of optimality are also obtained for series systems in the case of discounted return over an infinite planning horizon. © 1994 John Wiley & Sons, Inc.     

对党委集体领导与首长个人负责对立统一的再认识

党委集体领导与首长个人负责相结合是我军建设长期实践的结晶 ;“集体决策—首长执行—集体再决策—首长再执行”的过程 ,符合辩证唯物主义认识规律 ;正确理解党委集体领导与首长个人负责的对立统一 ,关键在于弄清两者的不同特点以及遵循的不同原则 ;实现党委集体领导与首长个人负责两者的统一 ,必须要有良好的思想保证和组织保证。     

A reusable planar triggered spark-gap switch batched-fabricated with PCB technology for medium-and low-voltage pulse power systems

Triggered spark-gap switch is a popular discharge switch for pulse power systems. Previous studies have focused on planarizing this switch using thin film techniques in order to meet the requirements of compact size in the systems. Such switches are one-shot due to electrodes being too thin to sufficiently resist spark-erosion. Additionally, these switches did not employ any structures in securing internal gas composition, resulting in inconsistent performance under harsh atmospheres. In this work, a novel planar triggered spark-gap switch (PTS) with a hermetically sealed cavity was batched-prepared with printed circuit board (PCB) technology, to achieve reusability with low cost. The proposed PTS was inspected by micro-computed tomography to ensure PCB techniques meet the requirements of machining precision. The results from electrical experiments demonstrated that PCB PTS were consistent and reusable with lifespan over 20 times. The calculated switch voltage and circuit current were consistent with those derived from real-world measurements. Finally, PCB PTS was used to introduce hexanitrostilbene (HNS) pellets in a pulse power system to verify its performance.     

延迟型泛函微分方程的一般理论

本文在引进Schauder 不动点定理的基础上讨论了具有延迟因子的泛函微分方程的一般理论,包括解的存在性、唯一性、连续依赖性以及解的延拓性质,并对文献[1]中的某些定理作了补充和推广。     

柔性制造单元监控系统总体设计与研究

本文就监控与诊断技术的发展现状与趋势进行了综述。设计并研制FMS/FMC监控系统CMFDS,给出系统的组成、功能、配制、硬软件系统、总体结构及系统的技术特点。在加工中心、FMS上的实验表明了该系统良好的通用性和简洁性,体现了集成化、智能化现代监控技术发展的趋势。     

基于动力学模型的柔性加工设备机电系统状态监测与故障预警

在建立的加工设备机电系统精确动力学模型及对模型参数实时辨识的基础上［１］,建立柔性加工设备机电系统的状态监测模型,包括ＢＡＹＥＳ故障检测、突发故障检测及故障分析与定位等;同时利用Ｋｕｌ－ｂａｃｋ信息距离和多层递阶ＡＲ模型实现系统的状态与故障预警。在加工设备上的实验表明模型可行有效,它能排除柔性多变工况、时变性及随机干扰对监测与预警功能的影响,提高其鲁棒性和自适应能力。     

卫星侦察需求价值量化的改进STT分析方法

卫星侦察需求价值量化对于卫星侦察需求评估及卫星侦察任务调度具有重要的意义,在RAND公司STT分析框架的基础上,从侦察需求分析过程、作战活动与侦察需求的关系、侦察需求价值计算3个方面进行了改进,使从战略到侦察需求的分析过程更具可操作性,得到的侦察需求价值更能够反映侦察需求对顶层目标的重要性,最后通过空中进攻作战案例对改进STT方法进行说明。     

目标自动跟踪与信息处理综合系统的研究与实现

根据将目标自动跟踪与信息处理综合的思想,在目标自动跟踪与信息处理综合的实现方面作了大量工作,并进行了实验.实验结果表明,只有在自动跟踪系统中综合目标信息处理,火控系统性能才能有质的提高.同时,数字信号处理(DSP)技术、自适应滤波算法的应用,使得系统设计能够基本达到实际应用的阶段.     

目标选择优化模型及算法

提出了可用于大威力武器火力分配的目标选择优化模型及算法。内容包括：问题的数学描述、问题的等价变换与分解、问题求解的动态规划算法和不同算法的计算次数比较。