Some comparisons of residual life of coherent systems with exchangeable components

Most of the research, on the study of the reliability properties of technical systems, assume that the components of the system operate independently. However, in real life situation, it is more reasonable to assume that there is dependency among the components of the system. In this article, we give sufficient conditions based on the signature and the joint distribution of component lifetimes to obtain stochastic ordering results for coherent and mixed systems with exchangeable components. Some stochastic orders on dynamic (or conditional) signature of coherent systems are also provided. © 2014 Wiley Periodicals, Inc. Naval Research Logistics 61: 549–556, 2014     

作战指数与火力分配统一处理的方法和意义—兼论数理战术学

本文将作战指数与火力分配统一放到战场环境中考虑,提出了作战指数与火力分配的合理性条件和合理交战模式、规范交战模式等概念,证明了规范交战模式是合理的,以及在规范交战模式中作战指数与特征向量的关系,文章最后表达了对建立数理战术学的迫切期望。     

基于FPGA的某发控仪模拟器设计

针对某导弹发控仪模拟器集成度低,难以提高性能的问题,提出了基于FPGA的微型化设计方法,给出了具体的硬件电路和软件设计流程图,对典型电路进行了分析。仿真结果表明实现了原电路的功能,提高了集成度,实现了系统的功能优化。该设计为同类模拟器的研制提供了有效的方法和途径。     

Bivariate models from univariate life distributions: A characterization cum modeling approach

Bivariate life distribution models are of importance for studying interdependent components. We present a generic approach by introducing a new concept of characterized model in stead of a characterized distribution. It strikes a balance between characterization and modeling approaches to eliminate their individual limitations and incorporate their respective strengths. The proposed model, being a characterized one, admits many important properties irrespective of the choice of marginal distributions. The retention of univariate IFR, DFR, IFRA, DFRA, NBU, and NWU class properties in the bivariate setup has been ensured along with some results on series combinations and convolution. No other models, available in the literature, can ensure simultaneous retention of these fundamental and extremely important class properties. © 2004 Wiley Periodicals, Inc. Naval Research Logistics, 2004     

Warranty costs: An age‐dependent failure/repair model

An age‐dependent repair model is proposed. The notion of the “calendar age” of the product and the degree of repair are used to define the virtual age of the product. The virtual failure rate function and the virtual hazard function related to the lifetime of the product are discussed. Under a nonhomogeneous Poisson process scenario the expected warranty costs for repairable products associated with linear pro‐rata, nonrenewing free replacement and renewing free replacement warranties are evaluated. Illustration of the results is given by numerical and graphical examples. © 2004 Wiley Periodicals, Inc. Naval Research Logistics, 2004.     

攻防对抗仿真中高炮火力单元射击指挥模型

在分析高炮火力单元射击指挥过程的基础上,着重对高炮火力单元射击指挥仿真中的目标搜索模型与杀伤效果评估模型进行了深入探讨和构建。在实现高炮杀伤效果评估方面,运用蒙特卡罗方法构建了符合实际、满足仿真粒度要求的高炮着发射与空炸射击毁伤概率计算模型。实际应用表明:模型满足仿真可信度和实时性要求,对开展地面防空作战仿真具有一定的借鉴意义。     

从火灾复核案件谈火灾事故调查能力的提高

开展火灾事故调查工作,是公安消防机构的一项重要任务。要加强火灾事故调查工作,提高火灾事故调查人员的能力非常重要。从几起火灾复核案件中暴露出的问题入手,提出了提高火灾事故调查能力的途径和措施。     

恒压变频控制设备在消防水灭火系统中的应用

分析了传统消防水灭火系统存在易锈死难改造等问题,介绍了恒压变频供水系统的基本工作原理和设计思路,论证了恒压变频供水系统在消防水灭火系统中应用的可行性,研究了将恒压变频控制设备应用到消防水灭火系统中应注意的几个问题,为改进消防水灭火系统提供了又一方法。     

航站楼消防设计若干问题探讨

消防设计的合理性对于航站楼安全运行具有重要意义。目前,国内尚未出台航站楼设计防火规范,因此,航站楼消防设计还处于探索和积累经验的阶段。介绍了航站楼消防设计四个阶段、重要设计难点,结合工程实际问题,对消防设计思路系统化进行了梳理,力图为设计者提供少许帮助。     

阶段事故树分析在舰艇火灾消防上的应用

对火灾过程的研究一直以来都是舰艇消防研究的重点,利用阶段事故树工具从火灾宏观发展过程的角度出发将舰艇火灾划分为6个发展阶段,研究了每一阶段的诱发因素,得出了导致这些因素的基本事件,并通过对它们各自结构重要度的比较明确了重点,最后分析给出了各阶段的应对措施并提出了相应的合理化意见建议。