起爆方式对战斗部毁伤作用的影响

用数值模拟和试验两种方法研究了破片轴向预制战斗部在中心单点起爆与平面多点同步起爆两种起爆方式下的毁伤作用。结果表明：装药端面中心位置处破片速度最高、抛射角为零,沿径向方向破片速度大致呈抛物线趋势衰减,而抛射角逐渐增大;相对于中心单点起爆方式,平面多点同步起爆方式下战斗部定向方向增益区域内的破片速度、密度增益明显,增益区相对爆山的锥角越小增益越明显。     

爆轰波定向战斗部起爆参数研究（英）

为了优化爆轰波定向战斗部的性能,研究了不同的偏心起爆形式.利用试验验证过的流体动力学仿真模型研究了偏心一线起爆不同起爆点数、偏心两线不同夹角和偏心三线不同夹角等对战斗部破片速度、飞散的影响.结果表明:对于本研究对象,在一条起爆线上布置4个起爆点是足够的;对于偏心两线起爆,两线之间夹角60°可在定向侧产生最高的速度增益,达38.37％;同样对于偏心三线起爆,夹角45°时的破片速度增益最大,达39.36％.定向方向的破片速度增益是爆轰到破片的传播距离(时间)和爆轰压力共同作用的结果.     

破片对模拟聚能战斗部装药冲击起爆研究

研究了破片对模拟聚能战斗部装药的冲击起爆问题.针对破片对聚能战斗部作用的工程问题进行等效模型简化,设计了模拟战斗部靶标及破片撞击试验方案,进行了1000～1500m/s速度范围内的冲击起爆试验,获得了装药被引发反应特性.与数值模拟进行对比,给出了破片对模拟聚能战斗部装药撞击起爆速度阈值.研究结果对反聚能装药战斗部破片杀伤元素设计具有指导意义.     

偏心起爆方式对棱柱形定向战斗部破片飞散规律的影响

为了研究起爆方式对棱柱形定向战斗部破片飞散规律的影响,采用LS-DYNA软件模拟研究了六棱柱定向战斗部分别用面偏心一线、面偏心两线、面偏心三线、棱偏心一线及棱偏心两线起爆时的破片飞散速度、破片方向角,结果表明,偏心起爆可以明显提高定向区域内的破片飞散速度,且破片束基本分布在25°左右的径向范围内,棱偏心两线同步起爆时,对目标方位破片最大飞散速度增益可达29.73%,采用棱偏心两线序贯延时起爆可使轴向方向角改变量达6.77°。     

杀伤爆破战斗部起爆方式对地面目标杀伤威力的影响

为提高杀伤爆破（简称杀爆）战斗部对地面目标的毁伤威力,利用靶场静爆试验和数值模拟方法开展了序贯起爆网络下的定向战斗部威力研究。基于LS-DYNA有限元程序分析不同起爆方式下杀爆战斗部的破片飞散规律,编写C语言程序获得有效破片落地时的分布密度和能量分布,结合毁伤概率法计算战斗部在落角、落速、落高不同运动参数下的有效毁伤面积。研究结果表明：偏心两线和偏心三线序贯起爆在定向方向的速度增益为20.3%、19.8%,序贯起爆可有效改善破片的飞散角,提高破片的落地动能和密度,进一步提高战斗部毁伤面积;偏心两线序贯起爆时战斗部的毁伤效能最高,有效毁伤面积增益最高可达809.1%;该毁伤面积计算方法可较好地反映出破片密度和动能对毁伤效能的影响,为不同起爆方式下杀爆战斗部的毁伤评估提供参考。     

偏心起爆定向战斗部威力研究

为研究偏心起爆定向战斗部毁伤威力,推导了偏心起爆点对侧延长线附近有限角度内应用的偏心起爆破片初速公式,并设计钨柱和钨球两种预制破片偏心起爆定向战斗部进行了试验验证。结果表明,所推导公式可用于偏心起爆定向战斗部计算。设计的偏心起爆战斗部的速度增益,钨柱破片为10.9%,钨球破片为19.8%。钨球破片初速、破片球面分布密度、毁伤概率均高于钨柱破片。     

钨合金破片对屏蔽装药撞击起爆的实验研究

分别为93钨和钨锆合金破片撞击仿真战斗部装药－覆盖金属盖板的注装B炸药（屏蔽装药）,采用“升－降”法研究了装药的起爆（引燃）临界性,分析了两种破片撞击作用下的装药起爆（引燃）的机理,研究结果表明,钨锆合金破片具有更强的起爆（引燃）战斗部装药的能力;93钨破片对其起爆（引燃）主要是冲击波作用的结果,而钨锆合金破片则主要是机械作用的结果。     

不同起爆方式对聚焦战斗部性能影响的数值模拟

利用LS/DYNA软件,采用中心和偏心两种起爆方式引爆聚焦战斗部进行全模型三维数值模拟,得到该战斗部两种状态下的破片初速及其分布规律;在仿真模型中加入靶板,得到距战斗部中心6 m处的破片分布,结果显示破片在两种起爆方式下都能在靶板上形成聚焦带.通过统计得出,偏心起爆能使破片速度增益为20.3%,破片在6 m处带宽为1 m的密度增益为9.6%,飞散角和方向角基本一致.     

预制破片对战斗部冲击起爆数值模拟

分析了高速条件下预制破片冲击起爆巡航导弹战斗部的作用杌理,采用 Lee-TaEver 点火增长模型和AUTO-DYN程序对高速预制破片冲击起爆战斗部进行了数值模拟,着重分析了破片材料、直径、形状和被起爆战斗部装药及壳体对冲击起爆的影响.结果表明,对于相同质量的破片,大密度和不规则的破片更容易冲击起爆战斗部;通过采用重金属材料,增大破片直径,采用柱形或其它不规则破片,可以提高破片速度来提高破片冲击起爆战斗部的能力.     

起爆方式对偏心式定向战斗部破片速度分布的影响研究

为了揭示起爆方式对偏心式定向战斗部破片速度分布及增益的影响,文中运用数值模拟的方法对一端起爆、两端同时起爆和线起爆方式下偏心式定向战斗部的爆炸过程进行了研究.研究表明,两端两点同时起爆时破片的速度增益比中心起爆时高28.1%,且高速度破片在周向上的分布角度宽,为最优的起爆方式.     

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。     

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.     

Experimental Study on the Small Flyer Initiating Behavior of Fine-grained Explosives

The initiating behavior of fine-grained explosives by small flyer is studied. The diameter of small flyer in this device is 1 ram. The test results indicate that the granularity of explosives has great effect on its flyer initiating sensitivity.The flyer initiating sensitivity of the fine-grained explosives is higher and the critical initiating energy is lower than that of common explosives. For common explosive, the flyer initiating sensitivity increases as the density is reduced. But for the fine-grained explosive, the test results are exactly opposite.