半自主式火控系统Petri网建模与作战效能

智能化和无人化是火控系统的未来发展方向之一,半自主式火控系统是实现全自主式智能火控系统的必要过渡阶段。设计了半自主式火控系统的功能结构和信息流程,并基于Petri网建立了系统仿真模型,对系统搜索指示、智能规划和精确打击3个功能单元的工作过程进行了论证,最后对系统的时效性、首发命中率和整体作战效能等战技性能进行了详细分析,仿真实验证明半自主式火控系统在作战性能方面优于传统火控系统。     

雷达网威力范围可视化方法研究

以雷达网威力范围的可视化为研究对象,提出了网格分割筛选算法,并给出了仿真实例,较好地实现了威力范围的二维可视化。还探讨了雷达网威力范围的三维可视化方法,并给出了较好的解决思路。     

海上编队信息系统的分等级安全防护体系

海上编队信息系统的安全防护能力,是确保系统稳定可靠和安全,确保作战指挥顺畅和信息安全,确保诸兵力协同作战时信息保密共享、信息安全利用、武器可靠共用的重要前提。海上编队信息系统的安全问题是一个系统工程,必须首先从系统体系结构上进行整体考虑。本文遵循深度防御、分等级防护和综合防范思想,确定了海上编队信息系统安全域划分原则,构建了分等级安全防护体系结构,为未来海上编队信息系统的分等级安全防护提供了指导和依据。     

高柔悬臂结构的弯曲型集中质量模型研究

基于质量集中和刚度等效的原则,提出了一种将高柔悬臂结构简化为弯曲型集中质量模型的新方法。首先,根据集中质量法确定简化模型节点处的集中质量。然后,基于振动特征方程和悬臂结构柔度矩阵中各元素与抗弯刚度的倒数之间具有线性关系的特点,推导出固有频率与层间等效抗弯刚度之间的非线性关系式;通过有限元软件对结构进行模态分析,提取其固有频率,将提取的固有频率代入关系式即可计算出等效抗弯刚度。最后,用数值算例对比验证了该模型简化方法的有效性和精确性。     

一种新型双频双感圆极化方形环缝隙天线

文章设计了一种新型双频双感圆极化方形环缝隙天线。通过在接地板上开两个方形环缝隙,并改变方形环缝对角处的缝隙宽度形成微扰,从而分离谐振模来实现该天线的双频圆极化辐射。两个微扰结构关于馈电微带对称放置,则形成双频双感圆极化辐射。对该天线进行了仿真、制作和测试,仿真和测试结果表明,该天线在两个频带都具有良好的圆极化辐射效果。     

基于图像识别引导的AGV运行仿真研究

在自动化立体库中,为较好地分析AGV图像识别引导技术,验证该技术的可行性,进行了AGV运行仿真研究。首先,分析了AGV运行环境情况,利用3dsMax进行了场景建模。然后,将模型文件读入OpenGL,编写程序实现AGV运动和运行视点的变换。通过采集AGV车身与路径轴线的偏差,计算其平均绝对误差并与实际要求比较,结果满足实际要求,从而验证了该技术的可行性。     

"专勤专教":增强思想政治教育实效的一项举措

增强思想政治教育实效性,要高度重视和关注思想政治教育面临的新形势和新挑战,充分认识开展"专勤专教"的必要性、重要性;要突出执行任务的特点,科学设置教育内容与方法,使教育贴近勤务、贴近官兵、贴近思想;要建立健全长效机制,促进"专勤专教"健康深入开展.     

模拟转子不平衡响应数值分析及实验研究

对模拟转子进行了不平衡响应的有限元计算,并进行了相应的实验研究.在转速为960r/min和1568r/min时,不平衡响应的计算结果与实验结果的误差近似为1.7%和2.1%,计算结果与实验结果相符.     

Fracture mechanism of a cylindrical shell cut by circumferential detonation collision

The failure mechanism of a cylindrical shell cut into fragments by circumferential detonation collision was experimentally and numerically investigated. A self-designed detonation wave regulator was used to control the detonation and cut the shell. It was found that the self-designed regulator controlled the fragment shape. The macrostructure and micro-characteristics of fragments revealed that shear fracture was a prior mechanism, the shell fractured not only at the position of detonation collision, but the crack also penetrated the shell at the first contact position of the Chapmen-Jouguet (C-J) wave. The effects of groove number and outer layer thickness on the fracture behavior were tested by simulations. When the thickness of the outer layer was 5–18 mm, it has little effect on fragmentation of the shell, and shells all fractured at similar positions. The increase of the groove number reduced the fracture possibility of the first contact position of the C-J wave. When the groove number reached 7 with a 10 mm outer layer (1/4 model), the fracture only occurred at the position of detonation collision and the fragment width rebounded.     

Research progress on advanced rail materials for electromagnetic railgun technology

Electromagnetic railgun attracts more and more attention due to its advantage in speed,cost,and obscurity.It is found that the rail should withstand huge mechanical and thermal shocks during the launching operation.The forms of rail failure are accompanied by gouge,grooving,transition,and arc ablation,etc.The service life of the rail has become a bottleneck restricting the development of elec-tromagnetic railgun technology.A series of researches are carried out to solve rail failure,including analysing the failure mechanism and using various advanced rail materials.This paper provides a comprehensive review of rail materials,including material composition,preparation,microstructure,and properties.We begin from a short background of the requirement of the rail material.Then a detailed investigation of rail materials is described,and the performances of those materials are introduced.Finally,further development prospect of rail material is discussed.