随机激励对火箭初始扰动的影响

针对火箭弹／发射装置系统，建立半约束期火箭弹的运动微分方程．把火箭弹的质量偏心和动不平衡作为随机激励处理，分析其对火箭初始扰动的影响。给出了在随机激励作用下火箭初始扰动的可能域。     

关于非平稳随机振动的分析方法

本文提供两方面的内容:(1)在时域中分解非平稳激励后求解时不变系统的响应及概率特征;(2)在频率域内利用谱场描绘谱等高线图的方法。还给出了车辆、火箭发动机受非平稳激励时的振动分析。     

某火箭弹运输装填车的振动响应分析与实验研究

文中建立了某火箭运输装填车的多自由度模型,并对典型路面随机激励下的振动响应进行了分析计算.结合行军实验,对弹体仪器舱附近的振动加速度响应进行了实验测试,实验结果与分析计算结果基本一致.     

美国多管火箭系统发展动向

美国多管火箭系统发展动向前言海湾战争期间，多管火箭系统向伊拉克一次次齐射照亮了夜空的图像通过卫星传到了千家万户。伊拉克把多管火箭系统的齐射称之为下“钢雨”。美国用于海湾战争的多管火箭发射车有２３０多辆，另外，英国为了支援它的武装部队也投入了１２１辆发...     

基于受控马氏链模型的状态监控方法研究

研究了有限状态空间中，应用受控马氏链模型对随机动态系统进行状态监控的方法。首先叙述了动态系统受控马氏链模型的描述方法，导出了SISO系统马氏链模型和差分方程的关系；其次给出了状态转移概率矩阵估计的具体方法；最后，依据某型火箭发动机实际测试数据，进行了仿真研究。     

舰载武器在舰船甲板上的布置研究

初始扰动是影响舰载武器发射精度的主要因素,但无法由试验测得。建立半约束期内火箭弹绕弹轴转动方程组模型,通过有限幅值随机激励仿真,得到了不同位置下舰船摇摆引起的舰载火箭初始扰动可能域。仿真结果表明将发射装置布置于舰船纵轴上能有效减小舰载火箭的初始扰动。因此将反舰导弹、防空导弹等对初始扰动要求高的武器布置于舰船纵轴上,将舰载火箭等对初始扰动要求低的武器布置在舰舯两舷有利于舰船甲板上各武器的统筹布局。     

火箭助飞鱼雷系统建模与空中弹道仿真研究

文中根据动量和动量矩定理，推导了火箭助飞鱼雷系统的三维空间运动方程，并对火箭助飞鱼雷助推段空中弹道进行了仿真，研究了影响火箭助飞鱼雷空中弹道的主要因素。     

对火箭助飞鱼雷一体化设计的思考

火箭助飞鱼雷是鱼雷技术和火箭技术的有机结合，传统的设计是将鱼雷作为助推火箭的弹头。火箭和鱼雷各自具有独立的动力、控制和测试记录系统。本文提出了一种新的设计思想，即火箭助飞鱼雷的一体化设计。助飞火箭和鱼雷共用控制系统(操舵机构除外)和测试记录系统。按照空中飞行体和水下航行体各自的控制数学模型和测试记录要求，配制相应软件，达到优化设计的目的。     

火箭炮残余振动对火箭弹弹道影响的研究

建立了火箭弹／火箭炮系统的相互作用动力学模型，并通过计算机模拟，得到了某火箭武器系统的发射架运动与火箭弹弹道偏差的函数关系，为优选火箭点火时间以提高无控火箭射击密集度提供了基础。     

弹－架耦合系统运动控制与柔性效应研究

以远程无控火箭为研究对象，探讨了弹－架耦合系统分布参数模型的运动控制和动态仿真问题，分析了结构柔性对火箭发射姿态和系统振动特性的影响，获得了一些新的重要结论     

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.     

Stability of the Third Generation Intensifier under Illumination

The stability under illumination of transmission-mode GaAs photocathode sealed in the third generation intensifier is investigated by use of spectral response testing instruments. The variations of spectral response with the illumination times under weak and intense illumination are compared. The variations of photoemission performance parameters are also characterized. The results show that during initial several weak illuminations photocathode behaves no evident decay and a maximum sensitivity is achieved, while under intense illumination the sensitivity of photocathode begin to decrease largely at the first illumination. The calculated performance parameters show that the variation of surface escape probability with illumination times is a direct cause of instability of photocathode. It is also found that under intense illumination peak wavelength is moved towards short-wave and peak response is decreased, which shows that the ability of long-wave response of photocathode is decreased.     

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.