军用飞机航材配送中心选址方法与模型

航材保障是装备保障工作的重要组成部分,直接影响部队作战和训练任务的完成。深入开展军用飞机航材配送中心选址方法研究,探索新的航材配送中心选址方法与手段,对于配送中心的科学选址,提高航材保障工作效益具有重要意义。针对军用飞机航材保障特点,综合考虑任务成功率、经济性和战时道路损毁等因素,提出了军用飞机航材保障配送中心选址方法,建立了配送中心的选址模型。最后,给出了具体算例,验证所建模型的科学性和有效性。     

基于滤波与BP神经网络的水下探测信号检测算法

针对水下探测系统探测船舶磁场信号时信噪比较低的问题,首先根据磁异常信号的频域特征,设计了约束最小二乘FIR滤波器,通过对含噪信号进行带通滤波,滤除高频噪声;再采用BP神经网络对低频分量进行学习,提取船舶目标特征信号。将该算法应用于船模实测实验,结果表明:该算法可以显著提高信噪比,增强对船舶磁场信号的检测能力。     

美国机载激光武器及其关键技术

激光武器是一种技术渐趋成熟的新概念武器,在防空、反导和反卫星作战中将发挥重要作用。系统介绍了美国机载激光武器的发展概况、组成与作战原理,分析了机载激光武器存在的主要技术问题,最后探讨了机载激光武器未来可能的作战方案。     

扫雷大功率控制中热设计方法研究

从扫雷控制设备实际工作环境的背景出发,就解决大功率控制热设计问题的方法和措施进行了实验研究和理论分析.这一方法在实际应用中已得到了充分的验证,具有重要的应用参考价值.     

汉语原型句蜕向英语多元逻辑组合的变换

汉语原型句蜕的英译形式多种多样,其中变换成英语的多元逻辑组合是涉及比较复杂变换细节的一种,因而成为颇具特色的语义块构成变换子类.文章从概念阐释入手,详尽分析了这种变换的语言现象、变换的必要性以及实施变换的技术准备.     

大口径顶置火炮输弹机动力学研究

为解决大口径顶置火炮弹药自动装填系统的关键技术问题,提出了大口径顶置火炮输弹机各工作阶段的力学模型和动力学方程,并通过输弹速度与时间的计算分析,得到了3种输弹方式的输弹速度与时间关系曲线,其结果对大口径顶置火炮供输弹系统的研究具有较大参考价值。     

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.     

Shock-induced reaction behaviors of functionally graded reactive material

In this paper, the ballistic impact experiments, including impact test chamber and impact double-spaced plates, were conducted to study the reaction behaviors of a novel functionally graded reactive material (FGRM), which was composed of polytetrafluoroethylene/aluminum (PTFE/Al) and PTFE/Al/bismuth trioxide (Bi₂O₃). The experiments showed that the impact direction of the FGRM had a significant effect on the reaction. With the same impact velocity, when the first impact material was PTFE/Al/Bi₂O₃, compared with first impact material PTFE/Al, the FGRM induced higher overpressure in the test chamber and larger damaged area of double-spaced plates. The theoretical model, which considered the shock wave generation and propagation, the effect of the shock wave on reaction efficiency, and penetration behaviors, was developed to analyze the reaction behaviors of the FGRM. The model predicted first impact material of the FGRM with a higher shock impedance was conducive to the reaction of reactive materials. The conclusion of this study provides significant information about the design and application of reactive materials.     

基于入侵杂草算法的水下目标TDOA定位方法

针对水下传感器网络中定位精度不高的问题,提出了一种基于入侵杂草算法的水下目标定位方法.利用入侵杂草优化算法,以定位误差为目标函数,优化设计未知节点的位置初值;利用初值和距离干扰参数估计粗略解,并引入目标定位误差来构造新的定位方程;根据加权最小二乘算法求解获得未知节点的精确解.通过与克拉美罗下界进行比较,验证了算法性能.仿真结果表明,提出的优化定位方法可得到更好的定位精度.     

多因素观测来源不确定的多目标跟踪算法

杂波、低检测概率和目标间观测相互干扰等因素,使得目标观测的来源难以辨别,提出一种基于改进GMPHD滤波的多目标跟踪算法,通过引入目标标记和权重向量,增广了标准GMPHD迭代中目标信息.基于高斯分量合并策略、目标状态估计策略和高斯分量优化策略,能够有效地改善目标状态估计精度和滤波迭代效率.目标跟踪仿真实验结果表明了所提算法的有效性及鲁棒性.