船舶动力装置仪表与控制系统的故障诊断系统研究

简述了故障诊断的原理、推理模型及诊断过程.针对船舶仪表与控制系统工作过程中的故障,研究了船舶动力装置仪表与控制系统的故障诊断系统,并给出了诊断实例.     

小波神经网络在装备研制费预测与控制中的应用

通过小波及小波变换的原理和方法,建立了适用于武器装备研制费用的小波神经网络预测与控制模型.结合某型装备研制费用,进行了预测与控制的数据仿真.     

论基础性研究在军队院校科研体系中的作用

论述了基础性研究在军队工程院校科研工作中的地位和作用 ,强调了进行这一工作的必要性和紧迫性 ,探讨了加强基础性研究的对策 .     

传递矩阵法在连续系统中的作用

在分析离散系统振动时,传递矩阵法是一种重要的方法。将传递矩阵法应用到具有分布质量的连续系统中,给出了具有Rayleigh阻尼形式的梁在随机激励作用下响应分析。     

基于DirectX的可视化仿真系统

提出了基于微机平台的某型防空导弹发射监控系统飞行可视化仿真系统的系统设计方案。根据系统的要求,利用VisualC 6.0和DirectX SDK,实现了真实感较强的实时的图形仿真系统。本系统的研究,对于以较低的成本实现图形仿真,有一定的现实意义和推广价值。     

一类非线性控制系统模型的数学分析

采用非线性分析的方法,研究了一类非线性控制系统模型,得到解的整体存在性。     

层次式网络管理系统故障管理子系统研究与实现

计算机网络日益复杂和异构化,迫切需要提高可靠、跨平台的网络管理系统保证网络稳定、高效运行。分析了传统网络管理系统的不足,提出了一层次分布式网络管理系统故障管理算法,并讨论了算法的性能。最后采用ＣＯＲＢＡ,Ｗｅｂ和Ｊａｖａ技术实现了该算法。     

华东烧结模型的数学计算(Ⅱ)

通过热力学分析和数学计算,讨论颗粒呈现面心立方堆积方式时,华东烧结模型中膨胀机制和收缩机制对烧结体总表面能的作用和总孔隙度比变化的影响,计算表明烧结过程中收缩机制占主导地位。     

The building evacuation problem with shared information

In this article, the Building Evacuation Problem with Shared Information (BEPSI) is formulated as a mixed integer linear program, where the objective is to determine the set of routes along which to send evacuees (supply) from multiple locations throughout a building (sources) to the exits (sinks) such that the total time until all evacuees reach the exits is minimized. The formulation explicitly incorporates the constraints of shared information in providing online instructions to evacuees, ensuring that evacuees departing from an intermediate or source location at a mutual point in time receive common instructions. Arc travel time and capacity, as well as supply at the nodes, are permitted to vary with time and capacity is assumed to be recaptured over time. The BEPSI is shown to be NP‐hard. An exact technique based on Benders decomposition is proposed for its solution. Computational results from numerical experiments on a real‐world network representing a four‐story building are given. Results of experiments employing Benders cuts generated in solving a given problem instance as initial cuts in addressing an updated problem instance are also provided. © 2008 Wiley Periodicals, Inc. Naval Research Logistics, 2008     

Optimum step‐stress accelerated life test plans for log‐location‐scale distributions

This article presents new tools and methods for finding optimum step‐stress accelerated life test plans. First, we present an approach to calculate the large‐sample approximate variance of the maximum likelihood estimator of a quantile of the failure time distribution at use conditions from a step‐stress accelerated life test. The approach allows for multistep stress changes and censoring for general log‐location‐scale distributions based on a cumulative exposure model. As an application of this approach, the optimum variance is studied as a function of shape parameter for both Weibull and lognormal distributions. Graphical comparisons among test plans using step‐up, step‐down, and constant‐stress patterns are also presented. The results show that depending on the values of the model parameters and quantile of interest, each of the three test plans can be preferable in terms of optimum variance. © 2008 Wiley Periodicals, Inc. Naval Research Logistics, 2008