远程火箭炮行驶过程振动边界条件分析方法

针对火箭炮在行军过程中发射系统在动力学分析中难以界定边界的问题,提出一种实验结合数值仿真的 研究方法。依据相似与模化原理,设计一项验证实验来模拟火箭炮行驶振动系统,基于正弦叠加模拟随机路面原理 生成路面谱。在Adams 中建立刚柔耦合的实验车台架试验系统,仿真实验车的整车台架实验测试,并通过数据对比 分析。结果表明：该方法精度较高,可满足工程研究中的误差要求,可运用到火箭炮系统动力学分析研究中。     

远程多管火箭炮武器系统核心部件研究

为研究远程多管火箭炮武器系统的核心部件,列举了国外的典型远程多管火箭炮装备,总结了一般组成。在核心整装装备的分析基础上,运用军民一体化装备维修保障思想,分别对火箭炮、炮用弹药、信息系统进行了相关部件分析,得出了八类核心部件的研究结果。     

基于固定目标式检测火箭炮方向调炮精度研究

自动操瞄式火炮在出厂前均要进行调炮精度检测,自动操瞄式火箭炮也是如此。当采用基于固定目标方式进行火箭炮方向调炮精度检测时,由于火箭炮自身结构及其他原因,存在一定的方向调炮精度检测误差。根据现场工作实践,总结出基于固定目标方式的火箭炮方向调炮精度检测方法,以及在进行这种方向调炮精度检测时对场地形态的要求;火箭炮在场地上停放的位置的要求;具体分析了火箭炮相对固定检测目标位置不同时对方向调炮误差精度的影响;对火箭炮与固定目标距离不同时的最大调炮误差进行了估算。     

火箭炮调炮精度的几种测量方法比较研究

调炮精度是火箭炮射击时能否命中目标的关键,是其最重要的战技指标之一.根据3种自动操瞄调炮精度测量方法的测量原理,建立了3种调炮精度测量方法的数学模型,推导出了相应的调炮精度测量系统的计算公式.在此基础上,结合火箭炮瞄准装置校准过程中的各种误差来源等实际情况,对3种测量方法的测量精度进行了分析.分析表明:3种测量方法各有利弊,根据具体情况选用.     

刚柔耦合的火箭炮高低调炮动力学仿真

为准确描述火箭炮高低调炮中的动力学特性,对其进行刚柔耦合的动力学仿真分析。以刚柔多体动力学 理论为基础,利用SolidWorks、ANSYS 和ADAMS 软件构建火箭炮高低随动装置刚柔耦合动力学模型,通过对模型 进行检验及参数设置,并结合实际工况进行仿真对比,确定了起落架应力集中区域。仿真结果表明：该研究能准确 反映火箭炮高低调炮时的动态性能,可为进行调炮的运动精度及可靠性分析提供数据支持,为高低随动装置的设计 优化提供参考。     

火箭炮倾斜调炮修正数学模型研究

针对火箭炮武器在野外进行自动操瞄时,由于车体倾斜而导致调炮精度降低的现象,文中在结合对火箭炮车体倾斜时定向管的射向、射角计算的基础上提出了火箭炮调炮精度修正方法。从理论上证明了该方法在消除调炮精度偏差上的可行性。同时,文中建立的数学模型也适用于其它武器发射系统。     

基于碰撞作用的箱式火箭炮动力学仿真

多管火箭炮机动性强、制造成本低,是一种有效的近程压制武器。而精确开展该类火箭炮虚拟样机建模与动力学特性分析的关键是处理弹管碰撞问题。文中通过合理地施加运动约束和激励载荷。建立了包括火箭弹管内运动碰撞模型的全炮动力学模型,通过仿真计算得到了火箭炮的动力响应及其规律,为火箭炮结构优化设计和初始扰动计算做准备,具有一定的理论意义和实用价值。     

来自俄罗斯的“旋风”

在1990年于马来西亚首都吉隆坡举办的东南亚防务展览会上,俄罗斯首次公开展出了一种新式多管火箭炮——“旋风”300毫米12管火箭炮。此后该炮经常公开亮相。这种火箭炮一出现,立即引起国际军火市场的广泛关注。人们普遍认为,它将成为美国M270多管火箭炮系统强有力的竞争对手。据悉,在向科威特政府出售火箭炮系统的竞争中,俄罗斯的“旋风”击败了美国的M270火箭炮赢得     

某多管火箭炮固有频率匹配研究

为减小火箭炮起始扰动,以有限元理论为基础,采用ABAQUS软件建立某多管火箭炮动力学模型。通过模态分析计算获得火箭炮各主要部件和全炮的动态特性,采用发射动力学分析得到定向管口初始扰动的相关参数,利用快速傅里叶变换得到对初始扰动影响最大的频率,并利用正交实验法,以固有频率为实验目标,确定对初始扰动贡献最大的部件。研究结果表明:该模型能有目的地优化部件,减小起始扰动,有一定的参考价值。     

基于ADAMS的某型炮闩故障仿真分析方法研究

针对坦克炮炮闩的常见故障和失效形式,讨论一种利用ADAMS软件进行炮闩受力分析的方法;通过建立炮闩零部件的三维模型,以炮闩抽筒装置为例,在相关零件之间施加约束和运动,建立炮闩运动和受力的虚拟样机,进行炮闩运动和动力仿真,给出炮闩的故障分析方法,为分析装备可靠性提供理论依据。     

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.     

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.     

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.     

Passive Acoustic Radar for Detecting Supersonic Cruise Missile

A Passive Acoustic Radar is presented as a necessary complement to electromagnetic wave radar, which will be expected to be an effective means for detecting cruise missiles. Acoustic characteristics of supersonic flying projectiles with diverse shapes are expounded via experiment. It is pointed out that simulation experiment could be implemented using bullet or shell instead of cruise missile. Based on theoretical analysis and experiment, the ““acoustic fingerprint““ character of cruise missile is illustrated to identify it in a strong noise environment. After establishing a locating mathematical model, the technique of acoustic embattling is utilized to resolve a problem of confirming the time of early-warning, considering the fact that velocity of sound is much slower than that of light. Thereby, a whole system of passive acoustic radar for detecting supersonic cruise missile is formed.     

Super-resolution Restoration of Remote-sensing Images

A novel image restoration scheme, which is super-resolution image restoration algorithm Poisson-maximum-afterword-probability based on Markvo constraint （MPMAP） combined with evaluating image detail parameter D, has been proposed. The advantage of super-resolution algorithm MPMAP incorporated with parameter D lies in the fact that superresolution algorithm MPMAP model is discrete, which is in accordance with remote-sensing imaging model, and the algorithm MPMAP is proved applicable to linear and non-linear imaging models with a unique solution when noise is not severe. According to simulation experiments for practical images, super-resolution algorithm MPMAP can retain image details better than most of traditional restoration methods; at the same time, the proposed parameter D can help to identify real point spread function （PSF） value of degradation process. Processing result of practical remote-sensing images by MPMAP combined with parameter D are given, it illustrates that MPMAP restoration scheme combined PSF estimation has a better restoration result than that of Photoshop processing, based on the same original images. It is proved that the proposed scheme is helpful to offset the lack of resolution of the original remote-sensing images and has its extensive application foreground.     

Design and Simulation of TF and TA Controller for Missile

A nonlinear terrain following(TF) and terrain avoidance(TA) controller is proposed for missile control systems. Based on classical TF algorithm (adaptive angle method), a new method for TF controller is proposed by using angle of attack. A method of obtaining terrain outline data from digital elevation map (DEM) for TF control is discussed in order to save store space. A TA algorithm is proposed by using bank-to-turn technique. The block control model, which is suitable for backstepping design, is given for nonlinear model of missile. Making full use of the characteristics of the system and combining block control principle and backstepping technique, a robust controller design method is proposed. Uncertainties in every sub-block are allowed, and can be canceled by using the idea of nonlinear damping. It is proved that the state tracking errors are converged to a neighborhood of the origin exponentially. Finally, nonlinear six-degree-of-freedom simulation results for the missile model are presented to demonstrate the effectiveness of the proposed control law.