近距格斗空空导弹的归零时间设计

导轨式发射的空空导弹归零时间设计是系统总体设计的重要参数之一。特别是对于近距格斗导弹来说它不仅涉及载机的安全，还关系到导弹的作战效果。它的设计与载机的挂点位置、导轨的尺寸、发动机推力、发射装置的开锁力、发射架与导弹相对运动时的摩擦力以及导弹的阻力等密切相关，同时影响导弹的控制精度。针对以上特性进行系统综合分析与设计，提出归零时间的设计原则。     

舰载发射箱在水下爆炸载荷下的瞬态响应分析

在充分考虑某舰载发射箱的较大长细比结构特征和冲击载荷的短历时特征的基础上,用显式动力学建立了发射箱（包含导弹）的有限元仿真模型。采用大质量法将结构的基础加速度激励转换成了等效的节点力激励,实现了基础激励的模拟,最后利用ANSYS／LS-DYNA进行了轴向冲击载荷下的动态响应分析。结果表明,发射箱的柔性结构特征使得不同位置的输出响应差距明显,响应曲线具有明显的震荡特征,分析结果为舰载发射装置的结构设计提供了理论依据。     

关于“捕鲸叉”导弹在飞机弹射、着陆、挂飞和火炮射击时结构响应的分析

1.引言像飞机所有外挂物一样,“捕鲸叉”导弹(AGM-84A)在其使用期限内将受到各种冲击和振动载荷的影响,这使导弹及其设备的可靠性受到威胁。与飞机作战直接有关的最重要的冲击和振动环境包括载机弹射和用拦阻装置着陆时的冲击载荷,挂飞时长期振动载荷,在飞机火炮射击时引起的短期振动载荷以及在导弹发射时强烈的冲击载荷。在较早的一个报告上评定了导弹结构对发射冲击的响应,本报告讲的是导弹对上面提到的其它动力载荷的响应。     

拉斐尔军火局的新型斯派德点／面防御系统

以色列拉斐尔军火局计划于2004年6月用其新型机动点／面防御系统首次发射怪蛇5和德比空空导弹，该防御系统被称为斯派德(Spyder)系统，主要用于攻击来袭的低空战斗机、直升机、无人机和精确制导弹药。系统配有4个导弹发射箱，内装2枚怪蛇和2枚德比导弹。斯派德的发射装置由另     

防空导弹起落架结构振动特性仿真分析

为了研究导弹发射时起落架结构的振动特性问题,利用三维建模软件和有限元分析技术建立了防空导弹发射装置的刚柔耦合动力学模型,深入研究了起落架结构的振动响应和变形情况。通过模态分析和谐响应分析,获得了在燃气流冲击作用下起落架结构的振动频率、模态振型以及结构应力的频率响应曲线。经验证,仿真与试验数据相一致。研究结果表明:模型较好地反映了起落架结构的振动特性,为进一步研究发射装置振动,避免共振等不良现象的发生提供理论参考。     

基于Partran/Nastran的发射装置振动特性设计

依据某型发射装置及导弹的结构,利用 Partran/Nastran软件建立发射装置及导弹系统的振动特性模型,并计算出该系统的固有频率,分析三个主要因素对系统振动特性的影响,在此基础上对发射装置进行改进设计,实现对发射装置的振动特性设计,避免"机翼-发射装置-导弹"之间共振的发生.     

某机载控制系统坐标转换技术研究

由于空空导弹与其挂装的载机坐标不同,并且导弹在不同挂点挂载方式也不同,为了使不同挂点不同悬挂姿态的导弹武器系统平显交联一致,必须进行坐标的转换。本文对某导弹坐标转换的原理进行分析,采用硬件解调和软件校正的方法,实现了离轴角信号的精确转换,解决了平显交联中的坐标转换问题,并且成功应用。     

发射箱车载倾斜发射过程下沉量影响因素研究

为研究车载倾斜发射装置在导弹发射过程中发射箱下沉量的主要影响因素,通过改进的Craig-Bampton方法将车架、回转台、发射架等柔性体融合在车载导弹发射系统多体动力学模型中,建立导弹发射系统刚柔耦合动力学模型,研究车架变形、回转台变形、发射架变形、燃气流冲击、风载荷作用以及起竖油缸变形等因素对发射装置动态响应的影响,获得不同因素对发射箱下沉量的影响因子,为开展系统的优化设计,减小发射过程中发射箱的下沉量及导弹初始扰动提供了理论依据。     

高速摄像系统在导弹发射装置模拟试验中的应用

以空空导弹发射装置地面发射试验为例,介绍了高速摄像测试系统组成,测试原理和数据处理.试验结果证明,利用高速摄像可以准确地获得导弹分离时刻速度、角速度、加速度等重要参数,很好地研究导弹的运动规律,也可为导弹性能检验提供有利依据.     

德国“台风”战斗机挂载“流星”空空导弹

<正>图中的军械人员正在为"台风"战斗机机腹进气道侧下方的半埋式挂点挂载"流星"空空导弹,每侧前后可各挂载2枚。"流星"是欧洲导弹公司(MBDA)研制的一种先进中距空空导弹,有多国参与研制,欧洲国家的"台风"、"阵风"、"鹰狮"战斗机都可以装备。该弹采用主动雷达导引头和双向数据链制导,导弹全长3.65米,弹径180毫米,发射重量185千克。它采用固体火箭冲压发动机,最大射程100千米以上,最大速度超过4马赫,尤其是在飞行末段还有持续的动力,以保证足够的机动性追踪目标,扩大了导弹飞行末段的目标不可逃逸区。     

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.