战斗部最佳起爆延时的计算模型及其应用研究

为确定战斗部最佳起爆延时,通过巧妙地建立坐标系,提出一种考虑破片速度指数衰减的计算模型.对共面交会条件下战斗部最佳起爆延时进行计算,得到了战斗部最佳起爆延时随弹目交会角的变化规律,及威力半径为9m时战斗部的作用范围.结果表明,随着弹目交会角的增加,最佳起爆延时存在一个极大值,且战斗部的作用范围趋近于战斗部威力半径.     

瞄准式战斗部最佳起爆方位研究

基于瞄准式战斗部的最佳起爆方位的研究实质上是对随动系统的方位和俯仰角的研究。主要研究了弹目交会参数对最佳起爆方位的影响,建立了瞄准式战斗部最佳起爆方位的计算模型。通过仿真计算了不同交会条件下俯仰角和方位角的变化趋势。研究表明,最佳起爆方位必须与弹目交会参数相匹配,才能提高引战配合效率。     

瞄准式战斗部最佳起爆延时控制研究

瞄准式战斗部是防空导弹提高战斗部杀伤威力的重要发展方向。根据不同弹目交会条件调瞄准战斗部的最佳起爆延时时间,可以提高防空导弹对目标的毁伤能力。文中建立了弹目交会模型和最佳起爆延时的计算模型,分析了影响最佳起爆延时的因素。仿真结果表明,最佳起爆延时不仅与交会条件有关,与随动系统的工作位置也有关。因此,必须确定瞄准式战斗部的最佳起爆延时才能有效击毁目标。     

一维相控阵引信起爆延时算法研究

传统固定倾角引信拦截TBM目标时，存在炸点可能滞后的问题，若采用增加引信探测距离和减小引信探测倾角的方法则增加了引信的设计难度，利用一维相控阵引信的波束控制技术，自适应地改变波束倾角并结合延时算法可实现对目标的最佳毁伤。文中研究了一种在最佳起爆角估计的基础上的延时算法，通过仿真分析了弹目相对速度以及相对速度矢量与弹轴夹角对延时算法性能和炸点精度的影响。     

定向战斗部最佳起爆延迟时间及起爆方位变化特性研究

建立了空间交会条件下定向战斗部最佳起爆延迟时间和起爆方位变化的计算模型,通过仿真计算对空空导弹弹目交会特性进行了分析。研究表明,在最佳起焊延迟时间段,目标方位可能发生象限变化,定向引战系统必须根据此变化调整起爆方位。     

防空导弹自适应起爆延时控制技术研究

根据弹目交会状态进行自适应调整的自适应起爆延时控制技术,可以有效解决防空导弹全空域、复杂交会条件下对目标的毁伤问题。文中通过建立最佳起爆延迟时间模型,以某型防空导弹为例进行蒙特卡洛仿真统计试验,分析了影响自适应起爆延时控制的因素,提出了两种工程可应用的自适应起爆延时控制方案,仿真结果表明,对该型防空导弹,依据弹目相对速度进行自适应起爆延时控制的方案合理可行。     

定向战斗部毁伤效能评估

准确的毁伤效能评估能够更加全面地分析评估战斗部的威力,对战斗部的评估和优化具有重要指导意义.定向战斗部能够提高弹载装药的能量利用率,但是其毁伤效能评估并不完善.针对定向战斗部毁伤评估存在的关键难题建立柱坐标系下引信-战斗部配合模型,考虑弹体的滚转角因素,基于激光周向探测引信提出最佳起爆延时和最佳起爆方位计算方法,通过实验验证的数值模型提取威力场打击迹线数据,最终形成适用于定向战斗部的毁伤效能评估程序.利用该程序计算不同定向战斗部结构对某直升机目标的毁伤概率,结果表明:圆柱和棱柱两种战斗部对目标的毁伤概率都随着弹目距离的增大而减小,但是棱柱型战斗部减小幅度远小于圆柱战斗部;棱柱型战斗部在30 m弹目距离时对该直升机目标的毁伤概率仍然能达到0.538.     

钨合金穿甲弹对超音速导弹战斗部冲击起爆研究

为研究高速钨合金穿甲弹对超音速导弹战斗部的冲击起爆特性,应用Lee-Tarver点火增长模型进行了数值模拟,获得了钨合金穿甲弹冲击起爆超音速导弹战斗部的机制以及弹目交汇角对冲击起爆的影响规律。结果表明:钨合金穿甲弹对超音速导弹战斗部的冲击起爆,发生在穿甲弹绝热剪切装药的阶段;偏轴距离相同,冲击起爆超音速导弹战斗部的能力,先与入射角大小成正比,后成反比;入射角相同,偏轴距离越小,冲击起爆超音速导弹战斗部的能力越强。     

基于制导引信一体化的自适应起爆控制

引信与导引头一体化( GIF)设计是提高引战配合效率的有效途径.结合一般雷达导引头,首先介绍一种波控引信与硬件一体化引信进行设计,提出一体化引信起爆控制的逻辑算法流程;然后建立基于GIF信息条件下和基于引信自身信息条件下的两种弹目交会模型,并推导了最佳起爆角、起爆延时的数学表达式;最后分析计算几种弹目交会条件下,多普勒...     

空地反辐射导弹自适应起爆策略研究

为提高配有触发/近炸复合式引信及杀伤爆破战斗部的空地反辐射导弹引战配合效率,提出了一种起爆方式、炸点位置自适应控制的起爆策略。在假设弹上设备获取导弹高度、弹道倾角、速度、脱靶方位及脱靶距离等信息的前提下,制定了触发优先辅以近炸的起爆准则;求取了毁伤目标天线的最佳近炸起爆点位置及对应的起爆延时。以AGM-88C攻击SAM-6的仿真结果表明:这种自适应起爆策略可以使导弹获得较高的引战配合效率。     

Nitrosation and Nitration of Tetraacetyldibenzylhexaazaisowurtzitane

Tetraacetyldibenzylhitane (TADBIW) was subjected to debenzylation by nitrosating with inorganic materials available commercially to synthesize tetraacetyldinitrosohexaazaisowurtzitane (TADNSIW). TADNSIW was purified, and its structure was determined by FTIR, 1H NMR, MS and element analysis. The debenzylation reaction of TADBIW gave quantitative benzaldehyde as a by-product. This indicates that the reaction produces an imine cation as an intermediate. Hexanitrohexaazaisowurtzitane (HNIW) was prepared from unpurified TADNSIW with the yield over 96.0 % and the purity more than 98.0 %. And the mechanism of the reaction from TADNSIW to HNIW is proposed to be oxidation of nitroso and nitration of acetyl on the molecule of TADNSIW, This reaction system involved is simple, and the reaction can complete within a short time and under mild conditions. The product can be easily to separate and the waste disposed readily.     

Method for Measuring Velocity of Warhead Fragments Based on Photoelectric Detection

For measuring velocity and impacting position of single fragment of warhead, a non-contact measuring method is proposed, in which a six-light-screen array, a position indicator, a multi-channel chronograph and a computer are used.The principle of measurement is described. The key device of the system is a light screen array sensor which consists of six light screens allocated with certain geometrical parameters. When the fragment flies through the light screen array, the time of passing through each of the screens is recorded by the multi-channel chronograph. According to the time data and the geometrical parameters of the array, the velocity vector and the location of the fragment can be calculated immediately. The presented method can be used to locate the fragment and to measure the real velocity on its flying direction. It can also be used to measure the velocity of a fragment swarm after the system is engineered further.     

A Robust Algorithm for Watermarking 2D Vector Maps with Low Shape-Distortions

The technique of watermarking has been introduced into 2D vector maps for many potential applications such as protecting the copyright of important GIS （geographical information system） data and tracing the data source of military maps. In most previous works, although the validity of the map data could be preserved during the embedding procedure, the shape-distortions of the map elements are usually neglected which would tend to degrade the invisibility of the watermarking schemes. A shape-preserving algorithm for watermarking 2D vector maps is presented in this paper. A 1D distance sequence extracted from the original map is adopted as the cover data instead of 2D coordinates. A watermark bit is represented by changing the distributions of the cover data. The embedding procedure induces lower shape-distortions than in former works. Experimental results indicate better invisibility of the proposed scheme, as well as its robustness to certain attacks such as map simplification, interpolation, additive noise and most geometric transforms.     

数码电子雷管中影响点火头性能因素分析

阐述了数码电子雷管中,点火药剂细结晶三硝基间苯二酚铅（LTNR）的制备工艺;从点火药剂的种类、加入黏合剂的质量分数、桥丝直径、点火头的电阻值、防潮漆的蘸涂等方面对点火头性能的影响因素进行了探讨;通过震动试验、并联起爆试验、延期精度检测与考核,试验结果表明：一次性合成的细结晶LTNR是制造数码电子雷管点火头较为理想的点火药剂,按技术要求生产的点火头性能指标能够满足行业标准要求。     

Stability of the Third Generation Intensifier under Illumination

The stability under illumination of transmission-mode GaAs photocathode sealed in the third generation intensifier is investigated by use of spectral response testing instruments. The variations of spectral response with the illumination times under weak and intense illumination are compared. The variations of photoemission performance parameters are also characterized. The results show that during initial several weak illuminations photocathode behaves no evident decay and a maximum sensitivity is achieved, while under intense illumination the sensitivity of photocathode begin to decrease largely at the first illumination. The calculated performance parameters show that the variation of surface escape probability with illumination times is a direct cause of instability of photocathode. It is also found that under intense illumination peak wavelength is moved towards short-wave and peak response is decreased, which shows that the ability of long-wave response of photocathode is decreased.     

Open Rule-setting System Applied to Conceptual Design of Engines

Open rule-setting method advanced in this paper concentrates on providing designers of engines with a convenient way to express their design innovations and develop the expected prototypes in the early CAD stage, and constitute effective models for the following analysis process of CAE and CAPP. The problems arisen in the process of conceptual design with the traditional experience-based development method are analyzed. Based on those analyses, open rule-setting method is presented and some associated technical problems are discussed. The functional framework of open rule-setting system was built as software engineering methods. The speciality of the engine product as a kind of complex product and the requirement of the engine product based on its structural particularity to rule-setting system are considered carefully. A demonstration is supplied to illustrate how the open rule-setting method enhances the efficiency and quality of the engine conceptual design.     

Design and Implementation of One Missile Visual Simulation System Based on OpenGL

The implementation of a missile＇s visual simulation system is explained that is developed with OpenGL（open graphic library） and the flight path and flight carriage in different stages of the missile are displayed. The establishment problems of the 3D scene are circumstantiated including the construction and redeployment of the model, creation of the virtual scene, setting of the multi-viewports and multi-windows etc. The missile＇s data driver, system flow, the modules and their mutual relations of the missile visual simulation system are discussed. The missile flight simulation results and effect of the scenes are given.     

Research on Linux Network Device Driver

By analyzing the working principle of Linux network device driver, discussing the Linux network driver structure and its key technologies, the general network driver structure and its design methodologies in Linux system are summarized. Through modifying the network device driver of Linux device driver 3rd version snull, c and improving the COW technology, the Zero-Copy technology in Linux （kernel version 2.6.11 ） is implemented. In the end, the success test tells us that the thorough analysis of network device driver is the foundation of many applications, and it also provides a certain improvement to a lot of real applications, even to military application development.     

Improvement and Experiment of the Reamer in Vibra Cutter Against Wave Edge of Titanium Sheet Alloy Parts

By analyzing the influencing factors of part quality making of sheet alloy of titanium by vibra cutter, the shape of upper reamer is set as cylinder and wedge-shaped form, and the lower reamer as plain and hemicycle form, and its main structural parameters are defined as well. Then it is validated further that such improved vibra cutter reamer can be used to process curve-edged parts of titanium alloy sheet. The experimental result shows that the titanium alloy sheet parts processed by above equipment have no sharpen angles for convex parts and evident crevasse of concave-edged part. In summary, such improvement can eliminate the free-waved edge and improve the manufacture quality of titanium alloy sheet parts greatly.     

Dynamic Encryption Technology in Ad-hoc Networks

A new dynamic encryption application in ad-hoc networks is proposed. The advantages of this method are its being able to use the previous ciphertext as a seed of a new encryption process, rendering the encryption process effective in all communication process by continuous dynamic key generation together with synchronization, and its capability to cut back on system bandages to a greater extent, which is valuable for the ad-hoc circumstance. In addition, the rationality and effectiveness of this novel encryption method have been verified by the test results.