大长径比脱壳穿甲弹飞行时的横向振动

研究了大长径比脱壳穿甲弹飞行时的振动情况 ,给出了弹体在任意初始条件下的振动位移表达式 ,最后对三种不同长径比的尾翼稳定脱壳穿甲弹在后效期的振动情况进行了计算 ,并对结果做了分析和讨论     

尾翼稳定脱壳穿甲弹发射过程振动分析

根据尾翼稳定脱壳穿甲弹的几何形状特点 ,建立了尾翼稳定脱壳穿甲弹三维振动分析有限元计算模型 .计算分析了某工程尾翼稳定脱壳穿甲弹的振动固有频率特性 ,得到了各阶振动的固有频率及相应振型 ;数值模拟了弹丸系统在共振条件下的振动响应 ;讨论分析了尾翼稳定脱壳穿甲弹振动特性对弹丸系统发射安全性的影响 ,为尾翼稳定脱壳穿甲弹的设计和事故分析提供一种工程方法     

尾翼稳定脱壳穿甲弹全弹道多目标优化设计

本文应用最优化理论和方法对尾翼稳定脱壳穿甲弹的装药结构和弹形结构进行了全弹道多目标优化设计.首先从装药结构和弹形结构计算出发,建立了尾翼稳定脱壳穿甲弹的内弹道、外弹道(含空气动力)、终点弹道计算模型,然后应用三种不同类型的优化方法对火药弧厚、装药质量、弹头长径比、弹芯直径、弹体圆柱部长径比五个设计变量进行了多目标优化设计,得到了比较满意的结果.     

小口径旋转稳定脱壳穿甲弹总体结构参量选择

本文在满足发射强度和炮口动能要求的情况下，针对消极质量、炮口能量利用率、飞行稳定性以及极限穿透速度等条件，给出了弹丸次口径比、长径比和弹芯质量的优化选择，为小口径旋转稳定脱壳穿甲弹结构设计提供了合理的依据。     

英为“挑战者”坦克研制一种新弹

英国正在研制一种新的尾翼稳定脱壳穿甲弹,该弹目前正在进行野外试验。它将取代目前“奇伏坦”和“挑战者”坦克所用的脱壳穿甲弹。这就要求对储弹架和瞄具进行改进。这两种坦克将采用二氧化碳激光测距瞄准镜。皇家军械研究发展机构宣称,达种新弹在战场距离上从任何角度都能击穿所有华约现役坦克。该弹采用大长径比的钨合金长杆弹芯,尾翼螺接在弹芯后部。三瓣合金弹托箍住弹芯,弹托前     

高等均值法和有限元法相结合计算穿甲弹的可靠性

高等均值法是在隐式极限状态函数下计算结构可靠性的有效方法.本文结合高等均值法和有限单元法对大长径比尾翼稳定脱壳穿甲弹进行了可靠性分析,考虑了载荷和材料性质的随机性、弹托和弹芯之间的配合间隙(或过盈),得出了合理结果,并提出了进一步提高强度、可靠性的建议.     

剖艉翼稳定脱壳穿甲弹

穿甲弹是依靠自身动能穿透装甲硬目标的弹种，故又称动能弹，是主要的反坦克弹种之一。就穿甲弹的种类而言，有普通穿甲弹、次口径穿甲弹、旋转稳定脱壳穿甲弹和尾翼稳定脱壳穿甲弹。目前大中口径火炮配用的穿甲弹主要是尾翼稳定脱壳穿甲弹。     

IB-12中间弹道靶道及其应用

脱壳穿甲弹中间弹道研究的一个重要问题就是近炮口区脱壳穿甲弹飞行姿态显示与定量测量.本文简要介绍了最近研制、建成的IB-12中间弹道靶道;首次实现了近炮口区脱壳穿甲弹飞行姿态的定量测量;给出了弹托飞散全过程的图象处理结果以及在脱壳穿甲弹研究中的一些应用。     

某脱壳穿甲弹不脱壳原因分析与解决

脱壳穿甲弹的不脱壳问题对产品的性能影响甚重，通过对鞭脱壳穿甲弹的结构分析，脱壳时的受力分析计算和静态载荷试验查找原因后，提出改进方案，实施后经全面试验验证，解决了该弹的不脱壳问题，提高了产品质量。     

穿甲弹发射故障的动态诊断

对某研制阶段的高膛压火炮发射穿甲弹研究发现,当静强度安全系数较大时多次发生断弹事故,这说明此时动强度已成为主要矛盾,应用模态实验技术研究了脱壳穿甲弹动态特性,获得了该脱壳穿甲弹结构模态参数,模态分析方法所获得的动态薄弱截面位置与试验弹断弹情况相吻合,为其发射故障诊断提供了实验依据.     

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.     

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.     

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.     

Influence of Installing Error on the Surface Shape Precision of the Axial Symmetry Aspheric Workpiece in Lapping

A method to calculate the surface shape error, which is caused by the installing error between the workpiece and the lapping tool in the process of form lapping, is proposed. The mathematical model which the installing translation error influences on the workpiece surface shape error is established. The changing rule of the error is simulated through the calculating example of the paraboloid workpiece. The results indicate that the surface shape error of the workpiece is increasing with the increase of the installing translation error, it is also increasing gradually along the center point of the curve surface to the edge, and the influence is severer to the curve surface with great curvature than that of the small curvature when the translation error is the same.     

Experimental Research on Output Performances of Giant Magnetostrictive Actuator

The paper introduces the performances of magnetostrictive actuators and its applications, discusses the design methods for the structure and internal magnetic circuit of a giant magnetostrictive actuator, and makes tests on the output displacement and force characteristics for an actuator using homemade magnetostrictive material. The experimental result shows that the actuator has satisfactory output precisions and ranges in transient and stable states, and can be used in lowfrequency vibration control system of precise equipment.     

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.