基于改进AHP的无人机作战能力量化研究

针对无人机平台及载荷类型多样、作战性能各异,难以统一量化分析的问题,提出一种基于改进AHP(层次分析法)的无人机作战能力量化方法,构建了目标-准则-指标-实例的多层作战能力结构关系.通过一种指数标度方法,降低了标度的主观性影响,优化了层次结构元素权重求解.基于无人机装备的作战能力构成构建量化指标体系,较好地实现了多类型无人机作战能力的量化评估,对于多无人机协同作战的兵力分析具有一定的实用价值.     

Influence of a liquid-filled compartment structure on the incoming shaped charge jet stability

Liquid-filled compartment structure consists of a bulk steel plate with matrix blind holes which are filled with liquid and a steel front plate to seal up the liquid with rings and bolts.The liquid-filled compart-ment structure can resist the shaped charge warhead effectively.This paper presents experimental and theoretical investigations of the penetration ability of the residual shaped charge jet emerging from the liquid-filled compartment structure after the penetration process at different impact angles.On the basis of shock wave propagation theory,the influence of the liquid-filled compartment structure on jet sta-bility is analysed.The interferences of the liquid backflow caused by a reflected shock wave and a back plate on jet stability under different impact angles are also examined.In addition,the range of the disturbed velocity segments of the jet at different impact angles and the penetration ability of the re-sidual jet are obtained.A theoretical model is validated against the experimental penetration depths.     

Hypersonic impact flash characteristics of a long-rod projectile collision with a thin plate target

Impact flash occurs when objects collide at supersonic speeds and can be used for real-time damage assessment when weapons rely on kinetic energy to destroy targets.However,the mechanism of impact flash remains unclear.A series of impact flash experiments of flat-head long-rod projectiles impacting thin target plates were performed with a two-stage light gas gun.The impact flash spectra for 6061 aluminum at 1.3-3.2 km/s collision speeds were recorded with a high-speed camera,a photoelectric sensor,and a time-resolved spectrometer.The intensity of the impact flash exhibited a pulse charac-teristic with time.The intensity(I)increased with impact velocity(V0)according to I∝Vn0,where n = 4.41 for V0 ＞ 2 km/s.However,for V0 ＜ 2 km/s,n = 2.21,and the intense flash duration is an order of magnitude less than that of higher V0.When V0 ＞ 2 km/s,a continuous spectrum(thermal radiation background)was observed and increased in intensity with V0.However,for V0 ＜ 2 km/s,only atomic line spectra were detected.There was no aluminum spectral lines for V0 ＜ 2 km/s,which indicated that it had not been vaporized.The initial intense flash was emission from excited and ionized ambient gases near the impact surface,and had little relationship with shock temperature rise,indicating a new mechanism of impact flash.     

An experiment evaluating how the tiny mass eccentricities in spin-stabilized projectiles affect the position of impact points

This study investigates and quantifies some possible sources affecting the position of impact points of small caliber spin-stabilized projectiles (such as 12.7 mm bullets). A comparative experiment utilizing the control variable method was designed to figure out the influence of tiny eccentric centroids on the projectiles. The study critically analyzes data obtained from characteristic parameter measurements and precision trials. It also combines Sobol's algorithm with an artificial intelligence algorithm—Adaptive Neuro-Fuzzy Inference Systems (ANFIS)—in order to conduct global sensitivity analysis and determine which parameters were most influential. The results indicate that the impact points of projectiles with an entry angle of 0° deflected to the left to that of projectiles with an entry angle of 90°. The difference of the mean coordinates of impact points was about 12.61 cm at a target range of 200 m. Variance analysis indicated that the entry angle — i.e. the initial position of mass eccentricity — had a notable influence. After global sensitivity analysis, the significance of the effect of mass eccentricity was confirmed again and the most influential factors were determined to be the axial moment and transverse moment of inertia (Izz Iyy), the mass of a projectile (m), the distance between nose and center of mass along the symmetry axis for a projectile (Lm), and the eccentric distance of the centroid (Lr). The results imply that the control scheme by means of modifying mass center (moving mass or mass eccentricity) is promising for designing small-caliber spin-stabilized projectiles.     

Mitigation effects on the reflected overpressure of blast shock with water surrounding an explosive in a confined space

The mitigation of blast shock with water has broad application prospects. Understanding the mitigation effects on the reflected overpressure of the explosion shock with water surrounding an explosive in a confined space is of great significance for military explosives safety applications. To estimate the effects of the parameters on the reflected overpressure of blasted shock wave, a series of experiments were carried out in confined containers with spherical explosives immersed in a certain thickness of water, and numerical simulations were conducted to explore the corresponding mechanisms. The results reveal that the reflected overpressure is abnormally aggravated at a small scaled distance. This aggravation is due to the high impulse of the bulk accelerated water shell converted from the explosion. With increasing scaled distance, the energy will be gradually dissipated. The mitigation effects will appear with the dispersed water phase front impacting at a larger scaled distance, except in the case of a dense water phase state. A critical scaled distance range of 0.7—0.8 m/kg1/3 for effective mitigation was found. It is suggested that the scaled distance of space walls should be larger than the critical value for a certain water-to-explosive weight ratio range (5—20).     

分布式A2C2决策队设计

现代战争的特点是高度的分布式协同作战。面对瞬息万变的战场需求 ,完成分布协同作战的指挥自动化系统 ,就必须能够自动适应战场需求变化 ,不断改变指挥系统组织结构。因此 ,实现指挥自动化系统的中心工作是建立 C2系统自适应变结构决策队组织。论述了建立自适应分布式指挥决策组织结构的有关问题 ,研究了在分布式条件下 ,自适应 C2决策队结构的设计。     

基于梯形道路的履带式车辆运动算法

论述了一种履带式车辆简化模型的建立和表示方法。提出了用垂直射线法来取得三维空间中任一点的高度值。分析了车辆模型在梯形道路上的运动状态 ,用一种简易的算法来实现坐标调整和地形匹配 ,在视景仿真系统中较好地完成了履带式车辆通过梯形道路的目的     

专用字符集译码逻辑的程序优化设计

提出了一种组合逻辑译码电路优化设计的基本原则 ,给出了基于该优化设计原则的程序设计所涉及的关键数据结构和算法 ,并利用现有中小规模译码驱动电路 744 8系列芯片和门电路等实现了工程实践中需要的特殊字符集译码优化设计的参考电路 .     

空气弹簧刚度的有限元分析方法

在简要分析确定空气弹簧刚度传统方法的基础上 ,从有限元的角度 ,提出了分析空气弹簧刚度的新思路 ,并初步解决了用有限元分析空气弹簧刚度需要解决的几何非线性、气压载荷变化等问题 .而后 ,以回转型空气弹簧为例 ,分析了其垂向刚度特性 .分析结果表明 ,用有限元分析空气弹簧刚度是可行的 .最后 ,根据空气弹簧的实际情况 ,提出改进分析的措施     

引信遥控装定方法研究

在现有无线电引信装定技术基础上 ,提出了一种新型引信遥控装定方法 ,并对装定方案的几个主要部分进行了理论分析和研究 .遥控装定技术对提高引信的抗干扰能力和提高弹药的毁伤概率具有重要意义 .