一种用于反攻击型无人飞行器的导弹末制导律

以反攻击型无人飞行器(AUAV)为工程应用背景。首先,基于导弹与AUAV类目标的非线性相对运动关系模型,给出了导弹的滑模变结构制导。然后,建立了模糊神经网络模型,利用模糊神经网络调整了引起抖振的参数,进一步削弱了滑模变结构制导律中存在的抖振。仿真结果表明:当AUAV作复杂大机动逃逸时,智能制导律能够以较短的时间和较小的指令加速度取得更小的脱靶量,与滑模变结构制导相比该制导律有较大的性能改善。     

空空导弹三维智能滑模导引律设计

提出了一种基于遗传算法优化RBF网络滑模变结构控制的空空导弹三维导引律,解决了一般滑模变结构控制中存在的抖振问题,提高了导引系统的鲁棒性。该导引律在目标机动的情况下,亦能实现很好的导引效果。仿真结果表明,该导引律与比例导引相比有较大的性能改善。     

变结构控制在导弹制导中的应用研究

首先简要介绍了变结构控制理论和导弹制导律, 接着对基于变结构控制的导弹制导律进行了比较详细的研究, 重点介绍了各种变结构制导律中滑模面的选择和制导律的设计, 并给出了一些仿真结果. 研究表明, 由于变结构控制的应用, 使得制导律具有很强的鲁棒性, 比传统的比例导引律有更多的优越性. 最后对变结构制导律进行了简要的总结, 并展望了今后的发展方向.     

基于免疫变结构的远程地空导弹机动突防弹道

针对远程地空导弹在拦截远距离目标时,容易被敌方防御系统发现并拦截的问题,提出了基于免疫变结构的远程地空导弹机动突防弹道。该弹道根据视线角速率跟踪有界振荡信号的思想,应用滑模变结构理论,考虑中末制导交班的约束条件,设计了一种机动突防中制导律,同时应用免疫反馈原理对滑模变结构控制中出现的抖振进行抑制和补偿。仿真分析表明,提出的机动突防制导律的正确性和有效性,该制导律显著地提高了远程地空导弹的机动突防能力。     

模糊自适应调整趋近律的导弹姿态滑模控制系统设计

将模糊控制理论与滑模变结构控制相结合,给出一种在模糊自适应调整下的滑模变结构控制方法。该方法在保持常规滑模变结构控制鲁棒性和自适应性的同时,有效削弱了滑模变结构控制产生的抖振。在给定参数设置的情况下,将该方法应用到某导弹俯仰通道姿态控制系统进行仿真,仿真结果表明系统具有较快的响应速度和较强的鲁棒性,同时有效削弱了滑动模态切换引起的抖振,验证了该方法的有效性。     

一种三维非线性免疫变结构制导律

针对导弹拦截过程中对目标机动未知的问题,将滑模变结构理论与免疫反馈理论相结合,设计了一种非线性免疫自适应变结构制导律。该方法首先根据李亚普诺夫稳定性理论,在滑膜变结构制导律的基础上,对目标的机动加速度进行自适应估计,消除了拦截过程中机动加速度干扰的非线性影响。其次应用免疫反馈的抗干扰和鲁棒性能,对滑模变结构控制中出现的抖振现象进行抑制和补偿。仿真结果表明,该制导律在目标作机动变速逃逸时仍能取得较好的拦截效果。     

带落角约束的空地导弹模糊滑模末制导律研究

为提高空地导弹的制导性能,满足空地导弹对落角约束的要求,获得最佳的打击效果,以经解耦的空地导弹-目标相对运动学模型为基础,应用滑模变结构控制理论推导出了带落角约束的空地导弹滑模末制导律,并用饱和函数取代滑模末制导律中的符号函数,削弱滑模末制导律的抖振。其次,应用模糊控制理论对滑模趋近律系数进行模糊自适应调节,设计出带落角约束的空地导弹模糊滑模末制导律。最后,应用Matlab对该模糊滑模末制导律的制导性能进行数字仿真验证。仿真结果表明,所设计的模糊滑模末制导律能够导引导弹以期望的落角命中目标,具有一定的应用价值。     

反装甲车导弹落角约束制导律研究

针对反装甲车导弹打击目标时落角约束要求,研究了两类典型的具有落角约束的导引律。通过在滑模变结构导引律的基础上引入模糊逻辑控制以减小控制量的抖振和系统能量耗损;在比例导引律的基础上引入时变导航系数与偏置项来满足落角约束。对两种改进制导律的有效性进行了仿真校验。仿真结果表明,与变系数偏置比例导引律相比,模糊变结构控制在干扰影响下仍能保持较高的制导精度。     

二阶Terminal滑模控制规律及其Windup效应的研究

文中提出的二阶Terminal滑模变结构控制方法有效消除传统滑模变结构产生的抖振,该方法既具有传统滑模变结构的特点,又能有效地消除传统滑模变结构所产生的抖振.同时,考虑了带有积分项的二阶Terminal滑模控制在控制受限的情况下的Windup效应.将一种Anti-Windup补偿器应用于该控制系统.将此方法用在非线性的多输入多输出微喷十字梁试验系统,仿真结果表明,该方法确实有效地消除了抖振,而且鲁棒性也很强.     

考虑自动驾驶仪特性的自适应模糊动态面滑模制导律设计

针对导弹拦截高机动性目标的问题,基于自适应模糊逼近策略和动态面滑模控制思想,提出了一种新型的拦截制导律。建立了考虑自动驾驶仪动态延迟特性的弹目相对运动方程,以零化视线角速率为出发点,设计了基于自适应趋近率的动态面滑模制导律,同时设计了综合视线角速率以及弹目距离的自适应模糊方法,对变结构项进行逼近。仿真结果表明,针对高机动性目标,该制导方法能够有效地去除抖振,并且具有良好的制导精度。针对导弹拦截高机动性目标的问题,基于自适应模糊逼近策略和动态面滑模控制思想,提出了一种新型的拦截制导律。建立了考虑自动驾驶仪动态延迟特性的弹目相对运动方程,以零化视线角速率为出发点,设计了基于自适应趋近率的动态面滑模制导律,同时设计了综合视线角速率以及弹目距离的自适应模糊方法,对变结构项进行逼近。仿真结果表明,针对高机动性目标,该制导方法能够有效地去除抖振,并且具有良好的制导精度。     

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.     

Method for Measuring Velocity of Warhead Fragments Based on Photoelectric Detection

For measuring velocity and impacting position of single fragment of warhead, a non-contact measuring method is proposed, in which a six-light-screen array, a position indicator, a multi-channel chronograph and a computer are used.The principle of measurement is described. The key device of the system is a light screen array sensor which consists of six light screens allocated with certain geometrical parameters. When the fragment flies through the light screen array, the time of passing through each of the screens is recorded by the multi-channel chronograph. According to the time data and the geometrical parameters of the array, the velocity vector and the location of the fragment can be calculated immediately. The presented method can be used to locate the fragment and to measure the real velocity on its flying direction. It can also be used to measure the velocity of a fragment swarm after the system is engineered further.     

数码电子雷管中影响点火头性能因素分析

阐述了数码电子雷管中,点火药剂细结晶三硝基间苯二酚铅（LTNR）的制备工艺;从点火药剂的种类、加入黏合剂的质量分数、桥丝直径、点火头的电阻值、防潮漆的蘸涂等方面对点火头性能的影响因素进行了探讨;通过震动试验、并联起爆试验、延期精度检测与考核,试验结果表明：一次性合成的细结晶LTNR是制造数码电子雷管点火头较为理想的点火药剂,按技术要求生产的点火头性能指标能够满足行业标准要求。     

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.