杆式射流侵彻钢筋混凝土试验研究

对于破爆式串联战斗部前级装药,如何兼顾侵彻深度和开孔孔径,是此类战斗部设计的关键问题。为了研究药型罩材料密度对杆式射流侵彻性能的影响,采用偏心亚半球聚能装药结构,进行了侵彻钢筋混凝土的试验研究。以侵彻钢靶作为对比试验,验证杆式射流整体侵彻规律并进行相关标定。研究结果表明,杆式射流对混凝土开孔的孔径随着药型罩材料密度的下降而逐渐增大。与紫铜射流相比,钛合金射流在保证一定侵彻深度的条件下开孔孔径提高约20%,因此钛合金是较为理想的聚能攻坚战斗部药型罩材料。试验结果及相关数据所展现的不同密度杆式射流侵彻能力大体相同,但钢类均质材料靶板无法体现钢筋混凝土内部出现的细节问题。虽然针对装甲目标的破甲弹等武器装备的设计理论较为完善,但不能完全作为聚能战斗部设计的理论依据。     

同时起爆串联战斗部数值仿真及实验研究

设计了一种同时起爆串联聚能装药战斗部,在对战斗部前后作用时序和匹配特性分析的基础上,运用Autodyn软件对串联战斗部前后级成型和钢靶侵彻过程进行数值仿真并试验验证。结果表明:当串联战斗部前级采用成型速度较快的K装药,后级采用成型速度较慢的亚半球形罩,可实现前级和后级对钢靶的接力侵彻,达到增加穿深并兼顾扩孔的目的,在仿真基础上,进行了串联战斗部对钢靶的侵彻试验,数值模拟结果与试验结果较吻合。为串联聚能装药技术的进一步研究提供参考依据。     

一种双药型罩形成侵彻体的数值模拟

为研究新型聚能装药结构在串联战斗部前级的应用,运用ANSYS/LS-DYNA有限元分析软件,分别选取混凝土和钢板作为侵彻目标,模拟侵彻体成型过程,得到存在一定速度差的两段侵彻体,一种是高速无杵体直径较小的高速射流,另一种是速度低直径较大的杆式侵彻体。结果表明:当侵彻混凝土靶板时,新结构开孔孔径增大27.3%,穿透了混凝土靶板且剩余速度为2 831 m/s,而普通结构药型罩穿透时剩余速度为1 523 m/s;当侵彻钢质靶板时,新结构开孔孔径增大40%,穿透钢质靶板且后段射流形态完整,其剩余速度为1 989 m/s,普通结构则未能穿透靶板。研究结果为串联战斗部前级装药提供一种新的选择,提升了侵彻能力。     

星锥状药型罩形成射流侵彻混凝土的数值模拟

为了提高串联随进战斗部前级聚能装药结构对混凝土介质的破坏威力.文中利用LS-DYNA有限元分析软件对一种星锥状药型罩聚能装药结构形成射流侵彻混凝土靶板的过程进行数值模拟,分析了其成型过程以及对混凝土靶板的侵彻结果.通过与传统单锥状药型罩聚能装药结构形成射流侵彻混凝土靶板数值模拟结果的对比,表明由星锥状药型罩所形成的射流对混凝土靶板具有更强的破坏能力.为新型复合战斗部的前级聚能装药结构设计提供了依据.     

一种M型药型罩形成环形射流的数值模拟研究

对串联战斗部前级聚能装药开孔不大的问题开展了研究,提出了一种M型药型罩,通过分析该药型罩结构设计的原理,运用ANSYS／LS-DYNA仿真软件对该药型罩形成环形聚能射流进行了数值模拟研究。结果表明：M型药型罩能够形成直径较大的环形射流,射流持续稳定;军用领域,能够用作串联战斗部的前级药型罩,对靶板切割成一定孔深且孔径大的环形孔,方便后级随进战斗部对靶板形成充塞破坏;民用领域,可以对一定厚度的靶板进行快速打孔。     

一种组合药型罩聚能战斗部

现随着现代舰船抗爆炸冲击能力的日趋增强,必须大幅提高鱼雷战斗部威力才能有效打击敌方舰船,为此设想了一种组合药型罩聚能战斗部应用于新型鱼雷.设计了聚能战斗部的结构,分析了其作用机理,利用有限元分析软件ANSYS/LS-DYNA进行了数值仿真计算,得到了其侵彻单层靶板的应力云图.仿真结果表明,该组合药型罩战斗部能利用前级聚能射流为后续爆炸成型射弹(EFP)弹丸随进破坏提供运动空间,对目标的破坏效应明显强于普通聚能战斗部.该研究结果可为新型高效鱼雷战斗部设计提供参考.     

串联聚能装药隔爆结构设计数值模拟和实验研究

为了解决在大块度障碍物上快速开孔且孔深和孔径优化匹配的难题,提出一种前后两级均为爆炸成型弹丸（EFP）装药的新型串联聚能装药结构。利用有限元软件,分析隔爆结构对串联EFP装药侵彻能力的影响为了解决在大块度障碍物上快速开孔且孔深和孔径优化匹配的难题,提出一种前后两级均为爆炸成型弹丸（EFP）装药的新型串联聚能装药结构。利用有限元软件,分析隔爆结构对串联EFP装药侵彻能力的影响进行相应的串联EFP装药侵彻45_#钢靶实验。实验结果表明:隔爆体形状对串联EFP后级装药侵彻能力有重大影响,优化后的串联EFP后级装药整体侵彻深度和后级侵彻深度分别提高了23%和35%,大大改善了串联EFP后级装药的利用效率。     

聚能装药对砖墙结构靶体开孔效能试验研究

通过3种罩型聚能装药结构的爆炸成形弹丸(EFP)对砖墙靶体的开孔效能试验研究,获得聚能装药结构对砖墙目标的开孔直径、开孔深度和开孔形貌。采用理论计算的方法获得爆炸成型弹丸的速度和系数C,从开孔效果和能量利用的角度分析,认为曲线+直线段组合罩结构对砖墙目标侵彻效果最为理想。     

串联随进弹侵彻预开孔靶弹道轨迹的数值模拟

利用移动载荷自定义程序的弹-靶分离方法,并结合Forrestal半经验靶体阻力函数,开展了串联随进弹侵彻预开孔靶弹道轨迹数值模拟。在实验验证计算模型及自定义程序可靠的基础上,研究弹-靶轴偏置、倾角、攻角等对串联随进弹侵彻弹道轨迹的影响规律。研究结果表明：弹-靶 轴偏置、倾角、攻角等因素对弹体的弹道轨迹及侵彻深度影响显著;预开孔孔道具有一定的引导侵彻作用;在弹-靶轴偏置、倾角及攻角的共同影响下,随进弹侵彻预开孔靶存在着跳飞可能。     

多点起爆对双层药型罩爆炸成型弹丸成型及侵彻特性的数值模拟研究

起爆方式对双层药型罩爆炸成型弹丸（EFP）成型特征参数及终点毁伤效应具有重要影响。基于双层药型罩EFP战斗部静爆试验结果,利用ANSYS/LS-DYNA非线性有限元动力学软件研究了起爆点数目对双层药型罩EFP战斗部成型及侵彻特性的影响规律。研究结果表明：当起爆点数目在4～8时,双层药型罩EFP战斗部可起爆成型具有良好空气动力学特性及优良终点毁伤效应的带尾翼大长径比聚能侵彻体;当起爆点数目为6时,双层药型罩EFP战斗部成型侵彻体终点毁伤效应的最大侵彻深度达到1.07倍的装药口径,较端面单点中心起爆方式获得侵彻体侵彻钢靶的最大深度提高了32%.     

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.