控制力矩陀螺的动态扫描成像卫星姿态控制

针对卫星动态扫描成像任务中的姿态控制问题,建立卫星姿态动力学模型,分析动态扫描成像任务对姿态控制的特殊需求。结合动态扫描成像任务需求提出一种典型的姿态机动方案,对姿态机动过程所需控制力矩进行估计。基于期望力矩和星体实时姿态设计一种俯仰机动控制律,并提出五棱锥构型陀螺群的操纵方案。针对某动态扫描成像任务卫星,对提出的控制律进行数值仿真。仿真结果证明所提方案可以满足卫星动态扫描成像的姿态控制要求。     

基于Fuzzy DEMATEL的军民融合后勤保障制约因素研究

现代后勤就是军民融合后勤。从思想性禁锢、体制性障碍、结构性矛盾和政策性瓶颈4个维度,系统地分析军民融合后勤保障存在的矛盾问题,构建军民融合后勤保障制约因素体系。引入Fuzzy DEMATEL方法,定量分析制约因素间的影响关系及作用机理,遴选出制约军民融合后勤保障深度发展的关键因素,为促进军民融合后勤保障健康有序发展,提供一定的理论依据和实用的操作方法。研究表明,迫切需要找到化解制约因素的有效途径,推动军民融合后勤保障向更高层次、更广范围、更深程度发展。     

预警机指挥多机群空战的协同战术决策

分析了预警机指挥下的多机群协同空战的战术决策方法,建立起了它的战术编队、威胁评估以及目标分配模型,并进行了仿真计算,结果表明此战术决策方法对于提高多机群协同空战的作战效能有着显著的作用,对于未来无人作战飞机多编队协同作战也具有很好的参考价值.     

Integrated guidance and control of guided projectile with multiple constraints based on fuzzy adaptive and dynamic surface

Based on fuzzy adaptive and dynamic surface (FADS), an integrated guidance and control (IGC) approach was proposed for large caliber naval gun guided projectile, which was robust to target maneuver, canard dynamic characteristics, and multiple constraints, such as impact angle, limited measurement of line of sight (LOS) angle rate and nonlinear saturation of canard deflection. Initially, a strict feedback cascade model of IGC in longitudinal plane was established, and extended state observer (ESO) was designed to estimate LOS angle rate and uncertain disturbances with unknown boundary inside and outside of system, including aerodynamic parameters perturbation, target maneuver and model errors. Secondly, aiming at zeroing LOS angle tracking error and LOS angle rate in finite time, a nonsingular terminal sliding mode (NTSM) was designed with adaptive exponential reaching law. Furthermore, combining with dynamic surface, which prevented the complex differential of virtual control laws, the fuzzy adaptive systems were designed to approximate observation errors of uncertain disturbances and to reduce chatter of control law. Finally, the adaptive Nussbaum gain function was introduced to compensate nonlinear saturation of canard deflection. The LOS angle tracking error and LOS angle rate were convergent in finite time and whole system states were uniform ultimately bounded, rigorously proven by Lyapunov stability theory. Hardware-in-the-loop simulation (HILS) and digital simulation experiments both showed FADS provided guided projectile with good guidance performance while striking targets with different maneuvering forms.     

拦截弹推进及弹道参数的模糊优化研究

在拦截弹推进系统和弹道参数的设计中 ,引入多目标多约束的模糊优化方法 ,在约束条件一定的情况下 ,合理选择和分配几个重要的设计变量 ,使得拦截弹的总质量最小、拦截时间最短。     

基于模糊时间序列的时变动态系统模糊建模

要想建立结构不确定、参数时变的动态系统的模型是很困难的。改进了Song Chisson的模糊时间序列方法,并成功应用于时变动态系统的辨识与建模和自适应控制。仿真结果表明该方法计算量小,实时性好,能很快地跟踪系统的变化。     

FBCB2的现状及未来发展

FBCB2是一个新型战场指挥控制/态势感知系统,在阿富汗、伊拉克战争中投入应用后,极大地增强了作战单元的战场态势感知能力、友军相互识别能力、通信和导航能力,使友军误伤大为减少,得到了官兵的广泛好评,产生了巨大影响。但是,FBCB2是一个新型装备,在实际应用中也暴露出了一些问题,为了克服老版本存在的缺陷,美军利用新的技术,并结合实际应用中的经验教训,对其主要系统进行重新设计。主要介绍美国改进FBCB2的两个方案。     

加工中心实时智能控制系统

加工中心的可靠运行是加工柔性自动化的重要一环。本文利用人工智能和多传感器信息融合技术监视多种加工异常情况,采用多种控制策略,并行工作,进行实时知识处理,推理相应对策,并控制ＣＮＣ系统,使加工恢复正常或停机,避免引起严重破坏。     

Why Culture Matters: Revisiting the Sino-Indian Border War of 1962

This article examines the nuclear command and control (C²) system implemented in Pakistan since 1998, and discusses its potential consequences for the risk of inadvertent or unauthorised use of nuclear weapons. I argue that troubled civil-military relations and Pakistan's doctrine of ‘asymmetric escalation’ account for the creation of a command and control system with different characteristics during peacetime and military crises. Although the key characteristics of Pakistan's nuclear C² system allow relatively safe nuclear operations during peacetime, operational deployment of nuclear weapons during military standoffs is likely to include only rudimentary protections against inadvertent or unauthorised nuclear release. The implication of this study is that any shift from peacetime to wartime command and control procedures is likely to further destabilise Indo-Pakistani relations during the early stages of a diplomatic or military standoff, and introduce a non-trivial risk of accidental escalation to the nuclear level.     

Britain and Hiroshima

Most historical accounts of the atomic bombings of Japan show little interest in Britain's explicit authorization for the attacks. Meanwhile, the few historians who have attempted to explain it rely on a unitary, rational actor model of the British state that is misleading. This article demonstrates that high-ranking British officials became anxious early on about the strategic consequences of a peremptory use of the new weapon. Therefore, especially over the course of 1944 they sought to engage Washington on the linked questions of the bomb's wartime use and its postwar control. However, these officials' initiatives were rebuffed by Prime Minister Winston Churchill, who paved the way to the bombings based on a fervent desire for Anglo-American integration, and on a dim understanding of the bomb's revolutionary potential.