V波段低副瓣波导缝隙天线设计

通过对Stevenson缝隙偏移位置公式进行修正,设计了一个工作于V波段的波导缝隙阵列天线。仿真结果表明,利用修正公式,可快速、准确地设计出高性能低副瓣波导缝隙阵列天线。天线增益17dB,H面主波束偏转60。副瓣电平小于一32dB。     

波导裂缝阵列天线阵面设计

介绍了波导裂缝阵列天线的整体结构，分析了天线各个组成部分的作用和在工程设计中必须考虑的一些实际问题。最后阐述了有源导纳法，以及设计辐射阵面的三个设计方程。     

实现平板缝隙阵天线低副瓣的一种设计方法

简要介绍了弹载雷达导引头天线实现低副瓣电平的重要性,分析了平板缝隙阵天线采用的几种典型的口面分布在实现低副瓣电平时存在的优缺点,并对平板缝隙阵导引头天线低副瓣电平设计给出一种设计方法,此设计方法在仿真实例中得到了验证。     

毫米波平面缝隙单脉冲天线设计

根据等效原理和缝隙表面的边界条件,应用矩量法,通过求解计算天线阵面中并联辐射缝隙的自导纳,完成了一个Ka波段平面缝隙单脉冲天线的设计.理论与实验的对比结果表明,该设计较好地达到了要求.     

单馈等功分周视压缩波导缝隙天线

针对无线电引信波导缝隙天线和馈电网络不满足小型化、一体化设计的问题,提出单馈等功分周视压缩波导缝隙天线。该天线由压缩波导缝隙阵列和E-T波导分支构成,谐振式工作,采用单馈输入等功率分配及双辐射阵元面,实现功分网络与天线一体化;通过对E-T波导分支增加尖劈结构改进,两天线间隔离度提高4dB。经Taylor综合法优化缝隙分布,优化后较均匀分布主副瓣比提高4.5dB。实测结果表明该天线最大增益13.05dB、H面宽度23°、E面最大零深宽度≤10°,与仿真结果基本一致。     

赋形低幅瓣毫米波梳形天线阵的设计与分析

介绍了微带梳形天线阵设计方法，在8mm波段上分析和设计仿真了一种行波微带梳形阵。阵列单元电流值采用泰勒分布，幅瓣电平优于-25dB。天线辐射方向图是个漏斗形方向图，具有定向辐射及低副瓣特性。     

64元宽带高增益低副瓣毫米波天线阵的设计

设计了一种64元阵列天线。该天线E面采用泰勒阵列理论来降低副瓣,但普通泰勒阵采用的是中间馈电方式,而且阵元间距固定为一个波长,文章采用边缘馈电方式和可变阵元间距的方法设计了一种新型的泰勒阵列。这种阵列不仅很好的降低了副瓣而且很容易实现角度偏转i文章设计的泰勒阵可以实现32。的偏转角。采用功分馈电网络同相馈电,设计了一种8×8的阵列天线,其增益达到了19．7dB,阻抗带宽（VSWR〈~2）达到了16．56％。     

毫米波引信天线

对毫米波引信天线进行了分析和设计,这种天线采用薄型波导缝隙阵,结构新颖,特别适用于飞行器天线,但由于这种天线的数学模型比较复杂,并且工作在毫米波波段,使设计和分析带来了一定困难,本文根据缝隙阵设计理论基础,解决了毫米波引信天线的设计难点,设计得到的毫米引信天线具有大倾角,低副瓣,高效率,宽频带和共形等优点,理论结果和实测结果相吻合,使这类天线在工程上得到了良好的应用。     

互耦对波导缝隙天线阵设计的影响及修正

在充分考虑了外部互耦影响的基础上,设计了辐射缝隙分别在波导宽边中心一侧和两侧排列、阵列终端接匹配负载的缝隙行波阵天线;并运用以有限元法为原理的Ansoft HFSS天线设计软件对该天线进行仿真;比较可见在缝隙天线阵的设计中互耦对天线阵的频宽及波瓣有很大的影响,本文通过考虑互耦影响,对缝长和偏心距进行的修正方法是有效的.     

一种基于缝隙电磁耦合馈电的印刷振子阵列天线研究

本文研究了一种采用缝隙电磁耦合馈电的印刷振子阵列天线.该阵列天线使用对称印刷振子阵列作为辐射器,通过引入印刷平面巴伦对平衡振子辐射器进行馈电;基于缝隙电磁耦合的方式对印刷巴伦进行激励,馈电的功分网络布置在金属地板下方以减少电磁耦合干扰.设计了电磁耦合结构和尺寸参数,对4单元印刷振子直线阵列天线进行了仿真和优化,实现了预...     

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.     

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.     

A Study on the Estimation of Aeroheating upon the Warhead Nose at Supersonic Speed

An expression for estimating the aeroheating on a warhead nose at different supersonic speeds is proposed by incorporating CFD （computational fluid dynamics） and the least-square method. Compared with the traditional estimation formula, the expression is more accurate, convenient and can be used in the optimized design of warheads. The error from the result obtained in the test of a ball cartridge flight is less than 3 %. It satisfies the engineering requirements.     

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.