自复位式低冲击分离螺母设计研究

设计了一种反推式分离螺母装置,主要完成了关键零部件的设计和校核,对反推式分离螺母装置进行了解锁试验.试验结果表明:分离装置的设计方案正确、工作可靠,其分离冲量小于1N·s,并能够自动复位,为同类产品的设计提供了一定参考.     

冷气分离装置设计参数对冲量的影响

通过应用正交设计法对冷气分离装置进行设计,并开展数值模拟,分析分离装置中气瓶容积、气瓶压力、介质温度和扩张比对有效冲量和后效冲量的影响。结果表明:扩张比对有效冲量的影响程度最大,介质的初始压力和气瓶容积是分离装置冲量影响较大的两个参数,介质温度对有效冲量的影响程度较小而对后效冲量影响较大,分离装置设计中应采用容积较小且设计压力较高的气瓶。     

膨胀管分离装置的分离冲击特性

为了分析膨胀管分离装置在解锁过程中引起结构振动的冲击来源,文中运用LS-DYNA对分离装置的工作过程进行了仿真分析.结果表明:冲击主要来自于膨胀管对分离端框的碰撞以及分离板断裂时应力的释放引起分离板振动;冲击值在结构界面衰减了50％,在结构内部由于应力波衰减效应与结构谐振效应相耦合,冲击值无明显增减.进一步分析得到两种冲击源对结构的振动贡献分别占55％和45％.     

一种低冲击分离螺栓的设计

介绍了一种低冲击分离螺栓的设计,重点介绍了螺栓承载能力的设计以及电起爆器的设计,并对低冲击分离螺栓进行了性能试验.试验结果表明,分离装置的设计方案正确、工作可靠、性能稳定,满足技术要求,为同类产品的设计提供了一定参考.     

一种脉冲推冲器结构设计的方法及实验研究

综合应用固体火箭发动机及火工品的原理设计了一种输出冲量为0.2～0.6N·s,作用时间小于2ms的脉冲推冲器,并根据设计结果制作模型进行实验.实验结果表明设计的脉冲推冲器达到指标要求,并通过实验得到了点火药及主装药药量、喷管类型及密封膜片对脉冲推冲器输出性能的影响规律.     

降低火工解锁螺栓分离冲击的技术研究

为了使火工解锁螺栓在分离过程中产生的分离冲击降到最小,对一种典型的火工解锁螺栓工作原理进行分析,确定了影响分离冲击的关键因素为分离部件的质量和起爆器装药量;并通过结构尺寸优化和起爆器装药小量化两种技术途径,分别使分离部件的质量从83g减小到17g,起爆器装药量从45mg减小到35mg.极限承载力与分离冲击试验结果表明:...     

小型快速火工解锁机构的设计与试验研究

基于SCB(半导体桥)点火技术,设计了一种轴向长度为64mm、径向最大直径为16mm的新型火工解锁机构,并通过拉伸承载力、分离时间与同步性等性能试验,测得其极限承载力不小于20kN、分离时间略大于1ms、同步性为0.126ms,且分离时无烟雾泄漏现象.试验结果表明本文设计的火工解锁机构具有结构尺寸小、分离时间短、同步性...     

一种基于形状记忆合金的低冲击分离装置

为了降低火工分离装置在作用过程中产生的爆炸冲击,提出了一种基于Ni Ti形状记忆合金（SMA）材料的火工分离装置,利用SMA材料在高温下回复原来形状时产生的恢复力为锁止、分离机构提供动力,并对锁止、分离机构及电点火器开展低冲击设计。功能性验证试验表明该火工分离装置在作用过程中产生的冲击加速度值为306g,远低于传统火工分离装置工作过程中的冲击加速度,实现了低冲击的目的。     

一种滚珠式分离解锁螺栓

为满足一种火工品的功能要求,设计了滚珠式分离解锁螺栓。重点研究螺栓承载能力并设计电起爆器, 对滚珠式分离螺栓进行性能试验。实验结果表明：滚珠式分离螺栓的设计方案正确、工作可靠、性能稳定,满足技 术要求,可为同类产品的设计提供参考。     

高同步性四路弹翼解锁机构的设计与试验研究

采用钝感电起爆器作为动力装置,设计了一种以燃气爆发点为中心,高压燃气沿"十"字型气体通道同步传输做功的弹翼解锁机构。通过对机构输出装药的性能裕度试验、解锁功能试验、解锁同步性试验,测得锁紧销回缩到位,满足功能要求;最大解锁作用时间5ms,解锁同步性0.27ms,解锁过程无燃气泄漏现象。结果表明,本文设计的弹翼解锁机构具有解锁作用时间短、低冲击、同步性高、密封性能好等特点,为同类产品的设计提供了一定参考。     

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.