确定药筒引伸模子D_(n-1)的解析计算法

药筒根部强度是靠末次引伸的加工率来保证的。为了获得末次引伸所需要的加工率,关键的问题是如何确定末前伸模子的工作直径D_(n-1)。由于准确地计算D_(n-1)有许多困难,目前普遍采用的是近似公式、经验公式或图解计算法。本文采用的是解析计算法。当引伸冲子采用典型形状时,使用本文提供的计算公式可以得到满意的结果。在个别产品的引伸冲子头部形状有改变时(如只有一个圓弧,或增加了一段斜梢),亦可以参考本法处理。由于加工率的表达式中有两个未知数,因此,需要再建立一个方程与它联立求解。这个方程是利用金属变形前后体积不变原理建立的。在求解一元四次方程时,应用了简化牛顿法。显然,这个解析计算法适用于各种口径药筒的末前伸模工作直径的设计。     

钢药筒末前伸再结晶加热后冷却速度对其成品药筒强度的影响

<正> 前言 我厂生产的某钢药筒是由深冲用优质碳素钢S15A制造的。它经三次引伸成型,末前伸为再结晶退火。 长期以来,一般认为对药筒强度起重要作用的是钢材的化学成分、末引伸冷变形程度及末前伸的退火温度,而对冷却速度却重视不够。 本文是通过某钢药筒的末前伸在相同温度加热,不同速度下冷却所得到的不同成品药筒的机械性能变化,来说明末前伸在A_(c1)附近加热后不同冷却速度对成品钢药筒强度的影响,并找出提高钢药筒强度的新途径。     

焊接药筒发射强度应力场分析

药筒的发射强度问题是药筒与身管之间互相接触的复杂的非线性问题。本课题采用大型有限元软件-ANSYS软件对发射药筒的发射强度进行分析计算，从而得到药筒的应力分布和危险截面。计算结果表明：药筒发射强度满足设计要求。     

可燃药筒实际燃烧速度的研究

通过对可燃药筒燃速公式的研究表明，由于药筒结构差异较大，若利用统一的整段模拟的燃速公式，误差较大；而对其分段处理并采用合适的拟合公式，效果很好，以此计算必将提高可燃药筒装药膛内数值模拟的精度，并为可燃药筒装药的弹道设计提供参考。     

弹体温引伸数值模拟

用 MARC/AutoForge 软件对弹体温引伸工艺进行了数值模拟,分析了凹模锥角、坯料温度及凸、凹模与工件之间磨擦系数对引伸工艺的影响,为弹体温引伸工艺制定提供了依据。     

钢质整体引伸药筒的吕德斯带解决措施

根据理想弹塑性线性强化模型,通过不同工艺处理后试片的电子拉伸曲线塑性段的分析,探索了钢质整体引伸药筒制造中吕德斯带的形成条件,经采取滚压、喷砂工艺,解决了该问题.     

强化材料液压自紧圆筒的残余应力和强度

本文按照广义平面应变问题,采用修正的Mises屈服准则及形变理论导出了具有应变硬化、包兴格(Bauschinger)效应的强化材料液压自紧圆筒的残余应力公式及其强度公式。经实验验证,这些公式不仅简单而且计算精度较高。     

抽筒力数值模拟

利用ANSYS有限元非线性分析功能,建立了身管与药筒的接触非线性有限元模型,并考虑了药筒材料超过屈服极限后的线性强化。以节点自由度耦合的方式，给自由度耦合节点以强制位移，用直接求出自由度耦合节点约束反力的方法来求抽筒力。     

提高焊接药筒焊缝质量途径的探讨

焊接钢质药筒是一种不需要大型压力设备,制作方法比较简单的钢质药筒。保证焊接钢质药筒焊缝质量是药筒强度性能的要求。而药筒环焊缝热裂纹的产生严重影响药筒的强度。因而就焊接钢质药筒环焊缝产生的原因及如何提高焊缝质量,确保药筒在射击时不发生火药气体烧蚀火焰药室等质量问题作了一些探讨。     

大功率、高效柴油机箱体强度分析研究

对一大功率、高强化发动机箱体的强度进行分析．为进一步完善箱体设计提供依据．模 型考虑箱体和主轴承盖、缸套、等效缸盖的接触问题，提出一种用温度法施加丝对预紧力的新方 法，该方法不仅能更精确地模拟实际预紧力情况，而且便于操作．本文给出该方法的理论公式．     

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.     

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.     

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.     

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.     

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.     

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.     

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。     

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.     

Algorithm for Multi-laser-target Tracking Based on Clustering Fusion

Multi-laser-target tracking is an important subject in the field of signal processing of laser warners. A clustering method is applied to the measurement of laser warner, and the space-time fusion for measurements in the same cluster is accomplished. Real-time tracking of multi-laser-target and real-time picking of multi-laser-signal are introduced using data fusion of the measurements. A prototype device of the algorithm is built up. The results of experiments show that the algorithm is very effective.     

Robust Graded Sliding Mode Tracking Control for Low Speed Spinning Ballistic Missiles

The nonlinear dynamic model of spinning ballistic missiles is established during the first boosting phase of the missile. Based on the conventional backstepping sliding mode control and the assumption of a two time-scale separation of missile dynamics, a graded sliding mode controller is designed with two sub-sliding surfaces which have invariability to external disturbances and parameter perturbations, and a matrix which comprises three first order low pass filters is introduced to prevent ＂explosion of terms＂. Owing to the upper bounds of the uncertainties are difficult to obtain in advance, adaptive laws are introduced to estimate the values of the uncertainties in real-time. Eventually, the numerical simulation results given to show the proposed controller can ensure the steady flight of missiles.