Heat Transfer Between a Missile＇s Combustion Chamber and the Warhead

Under higher temperatures the charge within a warhead will be subjected to physical and chemical changes, which will influence the security of the warhead launching process. In this paper the problem is studied adopting finite difference method for the case of a rocket-powered missile. Temperature distribution tables are giv-en through quadrature experiments, and the results fit the actual measured values very well. The results also show that to ensure the launching security of rocket-powered missiles having warhead charge critical temperature close to about 60℃, the designer can select appropriate heat insulation structural parameters.     

Simplified Approach to Velocities of Axial Forward Projection Fragments from the End of a Warhead

A warhead with axial forward projection fragments is one of the most important forms of aimable warheads. For such warheads the axial forward projection fragments are placed at the end of the explosive charge and form a fragment beam with high fragment density and high speed by the blast, which will obviously increase the damage to the targets. Experimental data showed that the velocities of the forward projection fragments on the convex end of a warhead which was initiated at the opposite end do not match that predicted by the Gurney equation for cylindrical warheads. A new approach for addressing the velocities of fragments of this kind of warhead is proposed. Two limiting conditions are defined, i.e. for fragment on the circumference of a cylindrical charge and fragments on the end of cylindrical charge, respectively.     

发射过程中燃料与壳体的运动特性分析

通过力学分析与计算,探索了燃料空气炸药(FAE)壳体与燃料在发射过程中的相对运动特性,指出了在发射过程中,在距离战斗部顶端一定范围内,壳体与燃料不但会存在相对运动,而且不同层位处的燃料也存在相对运动,这是FAE战斗部在发射过程中的特有现象.研究结果表明,燃料在战斗部中的位置对壳体与燃料之间的相对运动影响较大,而燃料与壳体间的摩擦系数对其影响较小.     

聚能装药射流的数值仿真研究

目的　分析聚能装药射流形成的机理 .方法　利用 ANSYS/ LS-DYNA有限元分析软件对某火箭弹中所用子弹结构进行了聚能装药射流形成过程的数值仿真 .结果　根据数值仿真模型 ,计算出圆顶药型罩子弹射流的任一时刻的速度梯度、直径、长度及侵彻深度 .结论　通过与实弹引爆试验的对比 ,验证了该数值仿真模型的正确性 ,为新型药型罩的开发提供了一种高效的设计方法     

Numerical Simulation of the Shaped Charge Jet Velocity Effected by Warhead Shell

The numerical simulation for the process of shaped charge jet produced with the shell of explosives is performed by means of the ANSYS/LS-DYNA 3D software.The effect of warhead shell on shaped charge jet velocity has been analyzed qualitatively in this paper.The numerical simulation results are creditable and in agreement well with that of the corresponding experiment.The research results show that the jet velocity of explosive with metal shell is higher than that without shell;when the shell thickness incr...     

Research on Protection Capability of Flying-Whip Multifunctional Explosive Reactive Armor

The experimental research on protection capability of the flying-whip multifunctional explosive reactive armor (ERA) was performed, in which the comparison experiment was made on the damage effect of the flyingwhip‘s geometrical figuration, material property and driven velocity on the long-rod armor-piercing-projectile. The moving velocity of the flying-whip driven by different explosives and the pressure attenuation law of shock wave travelling in the back plate were measured respectively with the electric probe method and the manganin piezoresistive gauge technique. The following conclusions based on a great quantity of experimental data were drawn: compared with the sandwich ERA the flying-whip multifunctional ERA has very good protection function against the long-rod armor-piercing-projectile, the shaped charge warhead and the anti-armor tandem warhead. In addition, the composite plate made of the armor-steel and rubber plate can lessen the vibration and shock of the main armor caused by the explosion of the charge.     

Qualitative Knowledge Based Discrete Rod Model with Simulation Case

Constructing a qualitative model for discrete rods warhead,the kinematics analysis and dynamics analysis of the rods are completed.On the basis of the qualitative model of discrete rods,a simulation case is provided.The qualitative simulation result shows that hexagon cross section shape of rod will receive the lowest air drag while by means of better preplaced dip angle,controlling the rotation velocity of the rod and keeping every rod with identical dip angle to the axis of warhead will make the rod get a...     

航空炸弹杀爆战斗部综合毁伤分析研究

战斗部综合毁伤是战斗部最重要的特性,也是衡量战斗部设计优劣的重要指标之一.预制破片的速度是战斗部综合毁伤很重要的指标.针对目前战斗部爆炸破坏机理需完善和试验费用昂贵的现状,基于理论计算和数值模拟分析了战斗部的综合毁伤.本文对杀爆战斗部的静态和动态杀伤威力、毁伤概率等综合毁伤指标进行了分析,计算结果与试验测试数据较为吻合,对新产品研制、论证具有一定的参考价值.     

高能聚黑类传爆药在水中兵器中应用研究

介绍了国内水中兵器装填传爆药发展现状,在分析高能聚黑类传爆药的主要成分、性能及与同类产品性能参数对比基础上,研究了高能JH-14传爆药起爆复合浇注PBX主装药的能力,并进行起爆能力和主装药爆炸完全性试验验证,结果表明：满足目前水中兵器战斗部主装药高能低钝感特性对传爆药起爆要求。     

Numerical Simulation on Explosion in Double-Layer Medium of Concrete and Soil

The numerical simulation on explosion in concrete and soil is performed by using the three-dimension finite element code LS-DYNA, into which a continuum damage model which can well describe the fracture of concrete is implemented. As a consequence, wave propagation and attenuation in concrete and on soil-concrete interface are obtained respectively. Moreover, the damage regions of concrete at different thicknesses of soil (TOS) and depths of charge (DOC) are procured. The existent soil reduces damage region of concrete. Numerical results provide reference for design of warhead and protective structure and blasting.     

Numerical Simulation on Explosion in Double-Layer Medium of Concrete and Soil

The numerical simulation on explosion in concrete and soil is performed by using the three-dimension finite element code LS-DYNA, into which a continuum damage model which can well describe the fracture of concrete is implemented. As a consequence, wave propagation and attenuation in concrete and on soil-concrete interface are obtained respectively. Moreover, the damage regions of concrete at different thicknesses of soil （TOS） and depths of charge （DOC） are procured. The existent soil reduces damage region of concrete. Numerical results provide reference for design of warhead and protective structure and blasting.     

弹头目标的ISAR回波特性分析

针对弹道导弹目标进行逆合成孔径雷达(ISAR)成像问题,对沿轨道高速运动并同时伴有自旋的弹头ISAR回波特性进行了分析.首先建立了弹头目标的运动模型和ISAR回波模型,将弹头的自旋矢量沿雷达视线方向和垂直于雷达视线方向进行分解,然后分别分析了弹头目标的轨道运动和自旋对回波信号的影响,最后进行了仿真分析.理论分析和仿真结果表明:弹头目标沿轨道的高速运动会使目标散射点产生严重的越距离单元徙动,而弹头的自旋会使目标散射点产生严重的越多普勒单元徙动,并使回波多普勒谱展宽,因而这两者都必须进行补偿.     

Simulation on damage effectiveness of hexagonal prism aimable warhead with multi-point synchronous initiations

In order to study the impacts of warhead geometry and initiation pattern on the lethality of aimable warhead,multi-point synchronous initiated hexagonal prism and cylindrical warheads were compared through numerical simulation,combined with theoretical formulas of fragment deceleration and target plugging.Enhancements of fragment velocity,kinetic energy and density toward the target and target destructions were analyzed.The results show that hexagonal prism warhead can produce dense fragment beams and enhance average velocity and kinetic energy with asymmetric eight-point initiation by 24.13% and54.52%respectively,which are higher than those of the isometric or same weight cylindrical warhead.The effective fragments are still relatively concentrated in an area of 8m×2mfor the hexagonal prism warhead when the distance between warhead and target is 40m.     

一种嵌入式安全网卡总体设计

提出了一种基于嵌入式系统的安全网卡设计方案。通过在网卡上引入SoC和嵌入式系统，在网卡上集成了嵌入式防火墙、网络隔离设备、硬盘保护与恢复及加密机等网络安全产品。并可以根据实际的需要，对嵌入式安全网卡的功能进行扩充和裁减。     

EFP Warhead Missile Fuze Analysis and Simulation

The explosive formed penetrator (EFP) warhead missile projects the blast fragments in one direction normal to the missile longitudinal axis. Through analyzing on the two restrictions of EFP warhead explosion: trajectory restriction and attitude requirement, the concept of fuze time-delay tolerance is presented to be the measurement of the time of the EFP warhead explosion. The calculation models of fuze time-delay tolerance under two restrictions are provided. Some crucial parameters playing important roles in calculation under attitude requirements are simulated. The simulation results show that the engagement plane angle, roll rate and warhead attack standoff influence the tolerance dramatically.     

一种Tor匿名通信系统的改进方案

为提高Tor匿名通信系统的安全性,通过分析Tor系统中目录服务器可能采取的攻击方法,提出一种基于目录服务器保护的改进方案。通过在用户与目录服务器之间加入一个P2P构架网络,并在网络中设置随机抛弃参数动态调整安全参数,增加攻击者对目录服务器攻击的代价,从而提高了Tor系统的安全性。从攻击代价的角度对Tor系统安全性进行了理论分析,结果表明,Tor系统安全性的提升程度取决于嵌入P2P网络的规模和随机抛弃参数,该方案可有效改进Tor系统的安全性。     

Full Digital Smart Fuze on Air Target

The intelligent fuzing is a kind of perfect way to optimize detonation location. The fuze can autonomously configure the warhead detonation mode to optimize the desired effects against the target. For the air target, the fuze can sense the impact in the impact mode then detonate the warhead on impact, otherwise, it will operate in the proximity mode and detonate at a closest approach to the target. The anti-jamming ability is also added on fuze’s full digital signal processing platform. The method for burst point’s controlling is analyzed and the digital intelligent fuze system based on system on programmable chip (SOPC) is designed.     

Research on Designing Profiled Rod Warhead

A new Kinetic Energy Rod (KER) warhead named profiled rod warhead is proposed in this paper. Based on the design of profiled rod warhead, a model of profiled rod driven by detonation is established. The detonation process is simulated by ANSYS/LS-DYNA, and the deployment velocity and initial flight attitude of rod are achieved. In addition, static rod deployment testing are performed to investigate the damage effect, the spatial flight attitude and deployment velocity. A satisfactory agreement is obtained by the comparison between numerical results and testing results. Meanwhile, the profiled rod studies are conducted to determine a higher penetrability compared with traditional cylindrical rods. Rigid body dynamics equations of profiled rod, which accounts for the influence of air resistance, are set up to predict the flight trajectory of long-distance. The results show that the profiled rod may provide a better penetration angle which still maintains a significant penetrability against projectiles when the rods move off long-distance range.     

提高火炮初速(动能)技术途径与潜力分析

目的　研究提高身管武器初速的理论基础与技术途径 .方法　根据火炮动力学原理 ,进行理论推导 ;对目前的火炮发射技术进行比较与评价 .结果　提出火炮弹丸初速的几个速度限制 ;进一步从发射药与装药的角度出发 ,提出提高速度的技术途径 .结论　理论结果和相关技术途径的提出对于火炮研究将具有实际参考价值 .     

基于RFID与蓝牙技术的停车场引导与管理系统

针对当前大型停车场停车、取车困难的现状,在深入调研的基础上,利用先进的RFID技术与蓝牙技术,开发出了一种基于R FID与蓝牙技术的停车场引导与管理系统。该系统很好地解决了大型停车场中停车难与取车难的现实问题,具有劳动成本低、工作效率高、安全保密、收费公正合理、抗环境影响能力强、系统扩展性强等特点。