分导式多弹头导弹弹道并行计算技术研究

弹道导弹弹头分导技术的研究是我国导弹技术发展的必然。文中依据弹道导弹多头分导原理,阐述了分导式多弹头导弹的分导工作过程。为了满足现代武器系统快速反应能力的需求,针对分导式多弹头导弹的弹道模型特点,提出了运用并行计算技术来快速提升弹道计算速度的方法,并建立了分导式多弹头导弹弹道并行计算模型。在Linux环境下进行仿真,结果表明,本方法能大幅度提高弹道计算速度,可以得到很高的加速比。     

导弹分离碰撞判断与最小距离快速算法

针对分导式多弹头导弹模型较规范的特点，提出了一种新的快速计算空间两物体间距离的方法，实现了对分导式多弹头导弹整个分离过程的实时仿真．仿真结果表明，本计算方法较简单，计算精度高，能准确地进行碰撞判断和距离计算．     

分导式多弹头导弹子弹头分导顺序优化与评估

针对分导式多弹头导弹在实际作战中需要对子弹头分导顺序进行选择的特点,根据分导式多弹头导弹母舱分导能力、子弹头机动飞行特性,把子弹头分导机动过程划分为多个不同的分导段,在此基础上建立了用于评估子弹头分导顺序优劣的评估指标体系,并以评估指标为基础,提出了基于乘除法和灰色ABO型关联分析方法的最佳分导顺序综合评估方法.该方法综合考虑了导弹射击精度、突防概率及打击效果等关键因素,为多弹头最佳分导顺序的确定提供了一种有效的决策方法.     

分导式多弹头导弹分导过程的一种最优控制方法

描述了分导式多弹头导弹的分导工作过程,讨论了分导过程的最优控制问题．研究了一种使推进剂消耗最少的分导过程最优控制方法．建立了用于分导式多弹头导弹分导过程最优控制的数学模型．给出了对分导式导弹分导过程进行最优控制的基本思路．     

扰动引力对被动段弹道的影响

文中采用球谐函数法计算扰动引力．在被动段标准弹道的基础上，建立了被动段干扰导弹模型。分别选取了近程、中程、远程导弹的三条被动段弹道进行仿真．计算了360阶、540阶、720阶和1080阶位系数下的扰动引力对不同射程的被动段弹道的影响。分析了扰动引力引起的落点偏差．仿真结果具有重要的参考价值。     

考虑气动干扰的导弹内埋式发射弹道研究

针对导弹从内埋武器舱发射后受到复杂气动干扰对初始弹道和自控终点散布产生影响的问题,研究了计算流体力学(CFD)与六自由度方程联合数值仿真方法,建立了载机和导弹的计算模型,编写了弹道程序,基于动网格技术,准确模拟了导弹的运动过程,获得了在发射初始无控段导弹的受力、位移和姿态角等参数,并为有控弹道自控终点散布仿真提供初始条件。仿真结果表明,气动干扰对内埋导弹发射后初始弹道和自控终点纵向、侧向散布影响明显。该研究可解决导弹气动与运动紧密耦合的问题。     

基于目标打击顺序的多弹头导弹分导方法

在多弹头导弹子弹头分导方法研究中须考虑目标打击顺序的影响,通过模糊综合评判确定了多个目标的打击顺序,根据目标的反导能力等因素确定了打击该目标的弹头类型以及耗弹量.结合多弹头导弹弹头特性建立了子弹头的分导原则,对子弹头的分导顺序进行了初步设计与优化.根据确定的目标打击顺序和优化的子弹头分导顺序,建立目标打击顺序与子弹头分导顺序的一致性原则来确定子弹头的最佳分导顺序.通过数值示例计算说明了子弹头分导方法的确定步骤,为多弹头导弹分导方法的选择与确定提供了一种有效的辅助手段.     

潜地导弹水下弹道建模与仿真

为研究潜地导弹水下弹道特性,分析了潜地导弹水下受力情况,将导弹水下运动分为四段,建立导弹水下运动方程。鉴于潜地导弹在水下垂直发射的情况,运用四元数法建立导弹运动学方程,避免了传统欧拉角方程的奇异性;然后在Matlab/Simulink环境下建立导弹水下各段仿真模型,并进行仿真计算,结果表明所建模型较好的模拟了潜地导弹水下运动,为进一步研究潜地导弹水下运动及出水姿态打下基础。     

导弹水下垂直发射的弹道研究

针对导弹水下垂直发射时的水中弹道进行了数学仿真研究，计算讨论了艇速对导弹水中运行弹道的影响。在水弹道研究的基础上，对导弹与运载器水面分离弹道也进行了数值计算研究，并进行了水洞模型实验和水弹道模型实验。数学仿真结果与模型水弹道实验数据进行了比较,计算结果与实验结果相符。     

垂直发射型舰空导弹比例导引三维弹道仿真研究

在对垂直发射型舰空导弹典型飞行弹道进行分析的基础上,将导弹运动学弹道分成无控段、转弯段和制导段,根据导弹弹道特征和制导特性,分别建立和推导了各段弹道的仿真模型.利用MATLAB语言的图形界面集成开发环境GUIDE创建了三维弹道仿真验证和演示软件,以检验弹道仿真模型的正确性和适用性.     

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.