CGCS2000大地问题解算工程运用研究

军事信息系统研制中经常涉及CGCS2000坐标系下的大地问题解算,但直接采用韦森特公式进行软件设计存在一些问题。通过对韦森特公式在工程运用中的问题进行了分析,对正解、反解算法进行了补充完善并给出了相关的计算实例供编程检查。改进后的算法简单实用,适合军事信息系统软件的实现。     

Reliability of a 2‐dimensional k‐within‐consecutive‐r × s‐out‐of‐m × n:F system

A 2‐dimensional rectangular (cylindrical) k‐within‐consecutive‐r × s‐out‐of‐m × n:F system is the rectangular (cylindrical) m × n‐system if the system fails whenever k components in a r × s‐submatrix fail. This paper proposes a recursive algorithm for the reliability of the 2‐dimensional k‐within‐consecutive‐r × s‐out‐m × n:F system, in the rectangular case and the cylindrical case. This algorithm requires min ( O (mk^r(n?s)), O (nk^s(m?r))), and O (mk^rn) computing time in the rectangular case and the cylindrical case, respectively. The proposed algorithm will be demonstrated and some numerical examples will be shown. © 2001 John Wiley & Sons, Inc. Naval Research Logistics 48: 625–637, 2001.     

Asymptotically optimal component assembly plans in repairable systems and server allocation in parallel multiserver queues

T identical exponential lifetime components out of which G are initially functioning (and B are not) are to be allocated to N subsystems, which are connected either in parallel or in series. Subsystem i, i = 1,…, N, functions when at least K_i of its components function and the whole system is maintained by a single repairman. Component repair times are identical independent exponentials and repaired components are as good as new. The problem of the determination of the assembly plan that will maximize the system reliability at any (arbitrary) time instant t is solved when the component failure rate is sufficiently small. For the parallel configuration, the optimal assembly plan allocates as many components as possible to the subsystem with the smallest K_i and allocates functioning components to subsystems in increasing order of the K_i's. For the series configuration, the optimal assembly plan allocates both the surplus and the functioning components equally to all subsystems whenever possible, and when not possible it favors subsystems in decreasing order of the K_i's. The solution is interpreted in the context of the optimal allocation of processors and an initial number of jobs in a problem of routing time consuming jobs to parallel multiprocessor queues. © John Wiley & Sons, Inc. Naval Research Logistics 48: 732–746, 2001     

气体灭火系统联动可靠性探讨

气体灭火系统用在特殊、重要的场所,其联动控制可靠性是成功灭火的关键.但由于设计单位、建设单位重视不够,影响了联动可靠性.为此针对气体灭火系统联动控制模式规范设计,严把施工质量关,搞好配套设备的控制,以确保系统联动控制可靠性.     

地(舰)空导弹弹体结构可靠性分析

对地(舰)空导弹弹体结构可靠性进行了分析,介绍了弹体结构可靠性的工程计算方法,提出了改进弹体结构可靠性的技术途径。     

考虑故障影响的机构可靠性建模

对影响机构可靠性的主要因素、机构可靠性变化的基本过程以及表征机构可靠性变化的指标参数进行了分析 ,针对机构可靠性问题的特点 ,提出了基于机构输出参数的目标函数与实现函数的叠覆进行机构可靠性分析的方法以及考虑故障等级影响、对不同故障等级进行加权的机构可靠性失效判据 ,建立了与此相对应的机构可靠性分析的数学模型 ,给出了利用Monte Carlo方法对数学模型进行求解的计算流程 ,并对某实际工程问题进行了实例分析。     

An optimal structured policy for maintenance of partially observable aircraft engine components

This paper considers the maintenance of aircraft engine components that are subject to stress. We model the deterioration process by means of the cumulative jump process representation of crack growth. However, because in many cases cracks are not easily observable, maintenance decisions must be made on the basis of other information. We incorporate stress information collected via sensors into the scheduling decision process by means of a partially observable Markov decision process model. Using this model, we demonstrate the optimality of structured maintenance policies, which support practical maintenance schedules. © 1998 John Wiley & Sons, Inc. Naval Research Logistics 45: 335–352, 1998     

随机-非概率模型下的船体结构屈服强度可靠性分析

针对在役舰船船体载荷、材料属性的随机特性和实船勘验得出的腐蚀损伤下船体抗力区间特性,提出一种基于随机概率理论和区间非概率理论的随机-非概率可靠性分析模型,分别从区间变量随机化和随机变量区间化两个角度给出该模型的可靠性指标求解方法。基于该模型对某舰船船体结构屈服强度进行可靠性分析,结果表明:该模型既体现了结构变量的客观不确定性又减弱了评估结果的盲目保守性,对于既含有随机变量又含有区间变量的在役舰船的可靠性评估具有很强的适用性。     

处理好工程力学与大学物理内容衔接的问题

大学物理课和工程力学课是学院2门重要课程。分析了2课衔接存在的问题,提出优化课程内容的方法:祥解、略讲、删减、增加。     

软件需求工程及其发展

详细介绍了需求工程的基本概念及其内容,根据目前的实际情况,简要总结了需求工程的常用方法和支持工具,并指出需求工程的发展现状和存在的主要问题。收集国内外的相关资料,进行综合分析,以便了解国内外的研究现状,并进行适当的相关研究。认为:软件需求的获取是软件需求工程的重要一步,是软件质量保证的基础:研究具有可操作性和实用性的软件需求工程辅助工具具有重要意义。