导弹弹射发射分离轨迹的数值研究

采用弹射方式发射空空导弹会提高对导弹姿态控制的要求。将基于N-S方程求解的流动数值模拟与控制律和求解导弹运动方程相结合,进行机载导弹弹射发射分离轨迹的计算研究。结果表明无控条件下静不稳定导弹在载机干扰流场中姿态发散较快,不利于导弹与载机的安全分离,引入姿态控制后导弹离开载机过程中的姿态变化得到有效控制,提高了导弹弹射发射安全性。     

激光寻的空地导弹制导控制方法

针对半主动激光寻的空地导弹的精确快速打击需求,提出一种基于测姿陀螺中制导与激光寻的末制导的空地导弹制导控制方法。分析激光寻的空地导弹的制导特性,在弹上仅安装陀螺仪条件下,分别对导弹俯仰、偏航、滚转3个通道构建不同的控制系统结构,通过倾斜稳定控制、姿态控制、比例导引控制以及程序控制的设计与有机结合,实现导弹弹体的稳定控制以及高概率目标截获,并对高精度激光启动照射时间的确定进行研究。飞行试验结果表明,采用该方法可实现激光寻的空地导弹的稳定控制,飞行所得弹道和弹体姿态结果与理论设计相吻合。     

高速非稳定弹体次口径发射试验技术研究

为满足高速非稳定试验弹体的次口径发射需要,设计了适于100 mm滑膛火炮发射的卡瓣式次口径弹托,通过试验研究了弹托分离过程及分离后弹体的飞行姿态;实验结果表明,次口径弹托在8.5 m内即可彻底分离,对弹体飞行姿态影响较小;非稳定弹体在弹托分离后仍然存在姿态稳定的着靶区间,该次口径弹托结构可用于非稳定弹体的高速侵彻试验。     

高速旋转弹的姿态控制系统设计

为了解决高速旋转弹姿态控制的难题,设计了一种基于滑动质量块姿态控制系统。从高速旋转弹姿态特点分析出发,建立了姿态动力学方程。根据时间尺度对其姿态回路进行了时标分离,将其分为内外两个回路,分别进行了控制系统设计。外环设计了含有跟踪误差及其积分函数的滑模控制器,内环则采用了依赖于状态的黎卡提方程(SDRE)的最优控制器。仿真结果表明,该控制系统能快速有效地实现对弹体姿态控制,可为实际工程应用提供必要的借鉴。     

基于布撒器的变质心姿态控制试验模型建立

导弹变质心姿态控制是通过改变弹体的质心，利用气动配平力矩来改变导弹飞行姿态。为了对这种新型的姿态控制方法进行原理性的研究，本文基于某型布撒器的风洞试验数据，根据变质心姿态控制的控制机理建立了变质心姿态控制的试验模型，为以后深入探讨和应用变质心姿态控制方法奠定基础。     

基于布撒器的变质心姿态控制试验模型建立

导弹变质心姿态控制是通过改变弹体的质心,利用气动配平力矩来改变导弹飞行姿态.为了对这种新型的姿态控制方法进行原理性的研究,本文基于某型布撒器的风洞试验数据,根据变质心姿态控制的控制机理建立了变质心姿态控制的试验模型,为以后深入探讨和应用变质心姿态控制方法奠定基础.     

激光寻的空地导弹制导控制方法

针对半主动激光寻的空地导弹的精确快速打击需求,提出一种基于测姿陀螺中制导与激光寻的末制导的空地导弹制导控制方法.分析激光寻的空地导弹的制导特性,在弹上仅安装陀螺仪条件下,分别对导弹俯仰、偏航、滚转3个通道构建不同的控制系统结构,通过倾斜稳定控制、姿态控制、比例导引控制以及程序控制的设计与有机结合,实现导弹弹体的稳定控制...     

基于CFD-FASTRAN的导弹折叠弹翼展开过程模拟?

为了研究飞行环境下导弹折叠弹翼的展开过程,文中介绍了如何采用气动分析软件CFD-FASTRAN对其进行模拟,包括问题描述、网格划分、计算参数设置等。根据计算结果分析给出了导弹4片弹翼展开过程中的同步性、展开角速度情况以及弹体姿态和姿态角速度的变化情况等。结果表明,模拟方法可行,模拟结果可为导弹总体设计、弹道设计及弹翼机构设计等提供参考依据。     

基于质量矩控制机理的导弹飞行姿态变化的研究

导弹质量矩机动控制通过改变导弹的质心，利用气动配平力矩改变弹体飞行姿态和攻角，从而实现导弹机动控制。在导弹高速飞行时，它克服了气动舵控制方案存在着舵面烧蚀及控制效率降低等弊端。本文详细推导了基于变质心控制导弹的非线性动力学方程，深入分析导弹在纵向平面内姿态变化情况，并研究了由于导弹质心移动引起弹体姿态角变化的两个重要因素，指出针对不旋转弹体的控制策略，为进一步设计导弹控制系统奠定基础。     

基于质量矩控制机理的导弹飞行姿态变化的研究

导弹质量矩机动控制通过改变导弹的质心,利用气动配平力矩改变弹体飞行姿态和攻角,从而实现导弹机动控制.在导弹高速飞行时,它克服了气动舵控制方案存在着舵面烧蚀及控制效率降低等弊端.本文详细推导了基于变质心控制导弹的非线性动力学方程,深入分析导弹在纵向平面内姿态变化情况,并研究了由于导弹质心移动引起弹体姿态角变化的两个重要因素,指出针对不旋转弹体的控制策略,为进一步设计导弹控制系统奠定基础.     

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.