穿甲弹对自行火炮易损性分析与计算

分析了自行火炮在穿甲弹作用下的易损性,建立了自行火炮易损性计算模型,并以某型自行火炮为例,分别计算了该炮在120mm穿甲弹正面命中与侧面命中时的毁伤概率。     

基于ICA的油库阀门内漏声发射定量检测

基于声发射原理的阀门内漏检测作为一种动态无损检测方法得到了广泛应用,但是定量检测一直是研究难点。现有的内漏率定量检测模型计算方法因参数不易测定,导致计算困难,精度不高。采用独立分量分析(ICA)方法提取声发射信号特征向量,并与参考样本集的特征向量相比较,相似程度最高的即可作为待测阀门的内漏率。内漏模拟实验分别将常规参数、频谱成分和ICA提取特征作为特征向量进行比较,结果表明ICA提取的特征向量维数为15时,均方根误差可以达到0.01 L/min,能够满足工程检测需要。     

Counterinsurgency American style: Considering David Petraeus and twenty-first century irregular war

This article examines the complex legacy of David Petraeus who was a key figure in the emergence of the US military shift towards counterinsurgency doctrine in the years after 2006. Although Petraeus has been perceived by critics as a publicity seeker, he can be credited with laying the foundations for a more serious commitment to COIN involving in particular in integrating conventional and Special Forces in arenas like village stability operations. The article looks a Petraeus's role in both Iraq and Afghanistan: it concludes that, in the case of Afghanistan, it is too early to assess whether counterinsurgency has had a decisive impact of the outcome of the war against the Taliban.     

Transformation of Military Ethics During the Zhou Dynasty in Ancient China

ABSTRACT

The transformation of the governance model from a rule of virtue to political realism in China has been a topic of great interest to scholars. In this study, I examine military culture during the Zhou Dynasty and investigate the changes in ethics based on factors such as cultural values, social customs, and political structure to understand the process by which moral values have changed as the governance model transformed from rule of virtue to political realism. I found that military ethics have changed from governance through the use of rituals during the Western Zhou Dynasty to what was called “deception makes an army” during the Eastern Zhou Dynasty.     

基于不同模式的反导作战管理与敏感性分析

针对反导作战指控系统作战管理任务与过程,分别构建了层次式、中心式和分布式3种作战管理模式。基于3种管理模式,采用以仿真系统搭建作战环境进行对抗的仿真评估方法,以拦截比率（发射数/拦截数）为评估参数对不同作战管理模式的效能进行了仿真评估,同时对影响评估效能的参数进行了敏感性分析。根据分析评估结果,明确了在不同作战样式下采用不同作战管理模式的基本原则。     

高超声速飞行器组合导航体系效能评估

集合当今世界高精尖端技术的高超声速飞行器,单一或简单的组合导航方式已经无法保障其高超声速全球到达的飞行任务。研究了一种INS\GNSS\CNS组合导航体系方案,与典型的INS\GNSS组合导航系统方案相比较,并采用改进的贝叶斯法融合算法对这两种导航方案进行综合效能评估。结果证明,该评估方法切实可行,便于计算应用,证实了INS\GNSS\CNS组合导航体系保障高超声速飞行器作战能力更强。     

外辐射源雷达系统中时延估计算法及仿真

时延估计的方法有经典的广义相关法、自适应法、循环平稳法、高阶累积量法、时频分析法等,重点分析了外辐射源雷达系统中用于时延估计的循环平稳法和相关法,并给出了循环平稳法和相关法用于时延估计的仿真,得出了仿真结果。仿真结果表明,对QPSK信号无法用循环平稳的方法来进行时差的获取,用相关法在极低信噪比条件下检测出目标信号,长时间的信号积累是必需的。     

神经网络和DEA方法的炮兵火力毁伤先验评估模型

提出运用BP神经网络理论和数据包络分析(DEA)方法,对炮兵火力毁伤先验评估问题进行研究。利用以往经验数据建立样本集,通过BP神经网络预测模型,对待评估的炮兵火力毁伤计划进行分析,预测其毁伤效益,再建立带有偏好锥结构的DEA评估模型,分析火力计划的可行性和合理性;最后以某部17组炮兵火力毁伤数据进行实例分析。结果表明,该模型能给出科学、明确、可靠的先验评估结果。     

A general model of heterogeneous system lifetimes and conditions for system burn‐in

Burn‐in is a technique to enhance reliability by eliminating weak items from a population of items having heterogeneous lifetimes. System burn‐in can improve system reliability, but the conditions for system burn‐in to be performed after component burn‐in remain a little understood mathematical challenge. To derive such conditions, we first introduce a general model of heterogeneous system lifetimes, in which the component burn‐in information and assembly problems are related to the prediction of system burn‐in. Many existing system burn‐in models become special cases and two important results are identified. First, heterogeneous system lifetimes can be understood naturally as a consequence of heterogeneous component lifetimes and heterogeneous assembly quality. Second, system burn‐in is effective if assembly quality variation in the components and connections which are arranged in series is greater than a threshold, where the threshold depends on the system structure and component failure rates. © 2003 Wiley Periodicals, Inc. Naval Research Logistics 50: 364–380, 2003.     

基于大涡模拟的气体羽流分层特性数值模拟

采用大涡模拟(LES)对气体羽流分层特性进行数值模拟,分析了基于LES的气体羽流模型、控制方程和数值计算方法,探讨了LES在多组分气体羽流模拟中的应用;以文献[1]中氦气在空气中形成羽流的实验数据为参考,对所建模型进行验证。利用该模型对密闭空间油气泄漏过程进行数值模拟,计算结果表明油气在泄漏发生的240 s之内,不同组分表现出显著不同的分层规律:相对于空气,密度较大的组分聚集在空间下部20%的范围内;密度较小的组分主要分散在空间上部80%的范围内。研究结果为油库油气危险源安全监测与预警、火灾预防与扑救等提供了关键参数参考和工程设计理论依据。