机电伺服系统的组合式能源技术研究

针对当前伺服能源论证需求分析,结合机电伺服系统长时小功率、瞬时高功率、制动负功率的用电特性,提出采用基于能量管理的组合式伺服能源方法,提高了伺服系统的能量利用率;通过试验验证,该方法既满足用电要求,又保证了伺服电源高可靠性、轻小型化的设计,为伺服能源设计提出新思路、新方法。     

基于ARINC429总线的导弹综合测试系统

基于ARINC429总线的导弹综合测试系统由地面测试计算机和弹上任务计算机构成,软件包括地面检测及弹上内置测试程序.分项测试时,任务计算机工作在弹内自检测状态,接受测试计算机指令进行弹上电气系统的测试;模拟挂飞测试时,任务计算机运行正常作战程序,测试设备模拟载机火控信号.     

伺服系统模块化设计在光电跟踪设备中的应用

文中介绍了一种伺服系统模块化设计方法．提供了一个在高精度两轴光电跟踪设备中．应用伺服系统模块化设计的实例,研究了模块选择、开发、组合及调试等问题．并采用频率响应法设计控制模块算法和确定算法参数。     

某主动悬挂液压伺服系统性能分析

对某主动悬挂液压伺服系统的开环频率响应、稳定性和瞬态响应等性能进行分析,为液压伺服系统执行机构的工程设计提供理论基础,确保设计的液压伺服系统性能满足要求。     

某型装备搜索雷达天线伺服系统检测诊断系统

为完成某型装备搜索雷达天线伺服系统的离线快速检测维修任务,研制一套检测诊断系统。该系统模拟 产生外部输入信号、各种控制信号,通过模拟负载模拟天线伺服系统的执行机构对输出的控制信号进行响应,在离 线状态下复现天线伺服系统控制搜索雷达天线竖起、撤收、旋转的工作过程,自动判定测试结果,并给出故障代码 以指导维修。实装维修应用结果表明：该系统具有操作简单、智能化程度高、检测诊断快速高效等特点,能完成要 求的测试项目,测试结果均达到技术要求。     

基于面向对象的机械传动试验台控制系统

基于面向对象的机械传动试验台控制系统,以交流变频调速实现无级调速,并采用数字液压加载控制液压加载器实现无级加载和载荷谱的模拟.试验台以586个人计算机为核心,通过可编程控制器、单片机分别控制交流变频调速和液压加载系统.系统将试验台设备的各属性和方法封装于设备对象中.采用分层程序设计,提供友好的用户接口,由此提高试验台的自动化程度.     

雷达导引头天线液压控制

设计导引头天线液压控制的关键是确认液压伺服机构的特性,通过理论分析、试验校正等方法可提高模型的有效性。分析了伺服阀控制的液压机构特性,用古典控制理论设计了一种雷达导引头天线液压伺服系统,讨论了预定精度分配、稳定回路去耦性能设计、改善系统低速平稳性等问题,仿真结果表明设计方法有效。导引头液压控制设计的基本方法,可应用于其它形式的伺服系统中。     

某火炮伺服系统数字电流环研究

针对火炮伺服系统模拟电流环存在控制参数不易调整、抗噪声干扰能力不足等缺点,基于现场可编程门阵列(field-programmable gate array,FPGA)设计了数字电流环的硬件电路和软件代码,并对电流环进行dSPACE扫频测试、仿真分析和性能测试.结果表明:基于FPGA的数字电流环性能优越,可满足火炮伺服系统的要求.     

用MATLAB进行三相交-交变频电源的仿真设计

三相交－交变频电源在低频拖动控制中有广泛的应用，通过晶闸管设计的静止式变频电源具有效率高，无噪声的优点，但却存在设计复杂、成本高，高速困难等缺点，而利用MATLAB软件中的Simlink仿真工具来实现三相交－交变频电源的仿真设计和分析，能做到省时，省成本，易于操作，在静止式变频电源设计中有很好的使用价值。采用MATLAB仿真工具完成了一个全数字控制的三相交－交变频电源的设计。     

3405碱液压伺服系统在战术导弹上的应用及发展

简略介绍了液压伺服技术在国内外战术导弹上的应用和发展;详细介绍了我厂为适应我国战术导弹的发展需要,进行液压伺服系统研究的过程及液压伺服系统的特点,并着重介绍了具有我厂特色的两种液压伺服机构,其中一种属国内首创、具有国际先进水平.同时为确保我厂液压伺服系统更可靠地工作,还对其未来的发展作了一些探讨.     

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.