火控系统软件的一种测试方法

基于火控系统的“黑箱”特征,提出了一种软件测试模型,并由此建立了有关的评价方去。从而可为火控系统软件测试的定量评价提供依据。     

Coordination mechanisms for a three‐stage reverse supply chain to increase profitable returns

In this article, we consider a generic electronic product that can be remanufactured or recycled at the end of its life cycle to generate new profit. We first describe the product return process and then present a customer segmentation model to capture consumers' different behaviors with respect to product return so that the retailer can work more effectively to increase the return volume. In regard to the collaboration between the retailer and the manufacturer, we explore a revenue‐sharing coordination mechanism for achieving a win‐win outcome. The optimality and sensitivity of the critical parameters in four strategies are obtained and examined both theoretically and numerically, which generate insights on how to manage an efficient consumer‐retailer‐manufacturer reverse supply chain, as well as on the feasibility of simplifying such a three‐stage chain structure. © 2012 Wiley Periodicals, Inc. Naval Research Logistics, 2013     

Gas metal arc welding of high nitrogen stainless steel with Ar-N2-O2 ternary shielding gas

High nitrogen stainless steel with nitrogen content of 0.75％was welded by gas metal arc welding with Ar—N2-O2 ternary shielding gas. The effect of the ternary shielding gas on the retention and improvement of nitrogen content in the weld was identified. Surfacing test was conducted first to compare the ability of O2 and CO2 in prompting nitrogen dissolution. The nitrogen content of the surfacing metal with O2 is slightly higher than CO2. And then Ar—N2-O2 shielding gas was applied to weld high nitrogen stainless steel. After using N2-containing shielding gas, the nitrogen content of the weld was improved by 0.1 wt％. As N2 continued to increase, the increment of nitrogen content was not obvious, but the ferrite decreased from the top to the bottom. When the proportion of N2 reached 20％, a full austenitic weld was obtained and the tensile strength was improved by 8.7％. Combined with the results of surfacing test and welding test, it is concluded that the main effect of N2 is to inhibit the escape of nitrogen and suppress the ni-trogen diffusion from bottom to the top in the molten pool.     

四层梯阶控制在卫星编队的应用仿真

研究了四层阶梯控制在卫星编队的控制问题及仿真。利用卫星相对运动的线性方程组和轨道机动算法的基础上,结合卫星任务规划、行为决策、行为规划和操作控制的四层阶梯卫星编队结构,从而建立建立卫星编队绕飞半径的滤波控制。仿真结果表明了四层阶梯控制在卫星编队在上对运动过程中,缩小卫星之间相对距离变换范围,增强卫星编队的稳定性。     

对发展我国水面舰艇指控系统的若干意见

本文从舰艇指控系统的研究设计方法发展、特点等方面阐述了如何发展我国水面舰艇指控系统的若干意见。     

试析基于信息系统的体系作战中的自适应响应

文章阐述了基于信息系统的体系作战中自适应响应的重要意义,分析了自适应响应的实现条件,提出了作战实体在自适应响应中应注意的一些问题及需要达到的要求。     

油-水旋流器颗粒体积分数及粒级效率数值模拟

为了研究油-水旋流器颗粒体积分数分布规律,应用计算流体力学数值模拟软件CFD,将湍流雷诺应力模型和多相流混合模型相结合,分别对单一直径颗粒分散相和由不同直径颗粒组成的分散相中颗粒体积分数和粒级效率进行模拟计算,得到油相云图、颗粒体积分数和粒级效率曲线。对比分析结果表明:油-水分离主要在锥段进行,轴心油核的大小随颗粒直径的变化而不同;大颗粒受到径向力作用大,容易分离;小颗粒受到水相阻力作用大,易从底流口排出;颗粒直径越大,分离效率越高。该结构旋流器对直径大于30μm颗粒分离效率较高。     

项目管理标准比较研究

从指导思想、体系结构、核心要素等方面对美国项目管理学会(PMI)编制的PMBOK2004、英国政府商务部(OGC)开发的PRINCE2、国际项目管理协会(IPMA)编制的ICB3.0、项目管理研究委员会组织编写的《中国项目管理知识体系》(C-PMBOK)等项目管理标准进行比较分析,从中为我们指导和规范国防科技工业领域的项目管理提供借鉴。     

试验环境需求分析与验证方法

为构建逼真的试验环境,首先对试验环境构建流程进行了分析,建立了试验环境需求分析框架,介绍了需求分析的背景空间、分析方法和管理与确认方法,研究了试验环境概念模型的构建方法,提出了概念模型验证的原则,并从语义、语法和语用三个方面建立了概念模型的验证指标体系,形成了一套完整的试验环境需求分析与验证的体系结构。该方法为试验环境构建提供一定的参考。     

基于可编程控制器的发动机油耗测量系统研究

通过分析现有发动机耗油率测试系统的不足,研究设计了一套用可编程控制器测量发动机耗油率的测试系统,设计了相应的电路,编制了测试软件,并分析了测试系统的精度．实机试验表明,该耗油率测试系统具有测量精度高、操作简便等特点．