基于氮气驱动的悬挂发射装置数理建模分析

建立采用氮气驱动的弹射型悬挂发射装置的数学物理模型,用气体动力学理论分析了高压氮气从储气罐通过导气管道到弹射活塞腔室,驱动活塞推动悬挂物直至其完全脱离载机的整个运动过程。给出了对某型号悬挂发射装置的实例计算,讨论了不同结构参数对弹射性能的影响,为该系统的实际设计开发提供了理论依据。     

一种高阶累积量的模态参数辨识方法改进及其应用

高阶累积量的模态参数辨识方法能够消除高斯噪声的影响。但基于传统的高阶累积量降阶方法的子空间模态参数辨识方法具有一定的缺陷。为此,提出2种降阶方法用于高阶累积量的子空间模态参数辨识方法,并对这2种方法进行了比较。利用主切片方法对某变截面轴进行了模态参数识别,获得了与有限元法相一致的计算结果,从而证明了该方法的可靠性。该方法的辨识质量较高,能够用于一般结构的模态参数辨识。     

Force protection and society

Wars have long been fought with a firm focus upon armies' domestic contexts. These socio-political foundations have underpinned decisions regarding embarking upon war as well the conduct of war itself. Of particular importance among liberal democracies is the emphasis which is now placed upon force protection; broadly conceived as the range of measures employed to ensure the protection of servicemen and women on operations. Decisions surrounding protective equipment, deployed locations and wartime activities all face detailed scrutiny in contemporary operating environments. The attitudes of the government, the military and the civilian population combine to create a complex and dynamic backdrop of harmony and tension to this most sensitive characteristic of modern wars.     

二级库存-运输系统的联合经济订购模型

结合器材供应的实际,构建了一个国家仓库-地区仓库形成的二级库存-运输系统,以最低费用为目标,建立了该系统的联合经济订购模型,求解了该系统各仓库的最佳订货量和订货次数;运用该模型对3种订货策略（年度1次订货、年度多次订货、零库存订货）进行了算例验证,表明了该模型在优化多级库存运输系统订货参数方面的意义。     

Stein–Chen approximation and error bounds for order fill rates in assemble‐to‐order systems

Assemble‐to‐order (ATO) is an important operational strategy for manufacturing firms to achieve quick response to customer orders while keeping low finished good inventories. This strategy has been successfully used not only by manufacturers (e.g., Dell, IBM) but also by retailers (e.g., Amazon.com). The evaluation of order‐based performance is known to be an important but difficult task, and the existing literature has been mainly focused on stochastic comparison to obtain performance bounds. In this article, we develop an extremely simple Stein–Chen approximation as well as its error‐bound for order‐based fill rate for a multiproduct multicomponent ATO system with random leadtimes to replenish components. This approximation gives an expression for order‐based fill rate in terms of component‐based fill rates. The approximation has the property that the higher the component replenishment leadtime variability, the smaller the error bound. The result allows an operations manager to analyze the improvement in order‐based fill rates when the base‐stock level for any component changes. Numerical studies demonstrate that the approximation performs well, especially when the demand processes of different components are highly correlated; when the components have high base‐stock levels; or when the component replenishment leadtimes have high variability. © 2012 Wiley Periodicals, Inc. Naval Research Logistics, 2012     

平面杆系任意截面内力算法构造及其应用

讨论了受任意集中力、集中力偶和线性分布力作用的平面杆系结构内力分析技术.遍历单元的轴向和横向荷载特征点,生成该单元的“轴向荷载教组”和“横向荷载数组”,以此为基础,构造内力计算的“特征点截面法”和“特征点递推算法”,并进行了分析.分析结果表明:两种算法适合包含梯形分布的复杂荷载组合,是一种实用的平面杆系内力计算技术,可...     

基于Petri网的潜艇CGF鱼雷攻击行为建模

为了实现潜艇对舰鱼雷攻击过程的计算机仿真,基于Petri网理论研究了潜艇鱼雷攻击过程的行为建模问题.在对潜艇鱼雷攻击过程的准离散化分析与构建了鱼雷攻击过程Petri网结构的基础上,将Petri网的变迁和潜艇鱼雷攻击过程的战术规则相关联,并提出了解决变迁冲突的方法,建立了基于Petri网行为模型.这种运用Petri网特有的可视化和以动态方式描述了潜艇鱼雷攻击过程的方法,有着坚实的数学基础,为进一步研究潜艇CGF鱼雷攻击自治行为规划打下了理论基础.     

边防武警执行命令行为的刑法学分析

基于我国的边防体制,边防武警执行命令的行为在边防管理活动中属行政行为,执行军事命令的行为属军事行为。边防武警执行命令行为性质的不同定位,导致了不同的法律意义。在不同的情况下,边防武警对命令有效性的审查义务在范围和程度上是不同的,由此,在认定犯罪排除事由的构成上也应加以区别。执行命令作为排除犯罪的事由,基于不同的要件,可构成合法化事由或者免责事由。在命令合法有效的时候,执行命令就成为合法化事由。在命令不具有合法有效性的时候,执行命令就不能成为合法化事由,但在一定情况下,执行违法命令可以构成免责事由,从而排除行为的犯罪性。     

公安消防部队群众工作机制建设的思考

公安消防部队群众工作机制建设,应从明确责任,加强对群众工作的组织领导入手;防火部门应着力组织做好消防宣传教育工作;政治机关应着重组织做好拥政爱民工作。     

卫星军事应用系统作战效能评估的网络层次分析法研究

根据卫星军事应用系统的特点研究了基于网络层次分析法的效能评估方法.确立了效能评价的准则,给出了影响其作战效能的指标集,建立了网络层次分析法控制层和网络层模型,并且利用计算极限超矩阵的方法对单个准则下各方案的作战效能进行排序.最后,通过对单个准则下的排序向量进行加权求和获得卫星军事应用系统作战效能的排序向量.