仿真在HiMAT飞行器研制和飞行试验中的作用

仿真部件高机动飞机技术(Highly Maneuverable aircraft technology,缩写成HiMAT)的设计,共研制出4种仿真方法。第一种叫作BASIC仿真(基本仿真),全部部件的模型都用软件表示。BASIC仿真,是设计和研究控制系统的主要工具,可用在飞行员训练和制订飞行计划中。第二种叫作VERIFICATION仿真(检验仿真),它使用驻留在计算机(与飞行时使用的地面基地控制规律计算机一样)里的主要控制规律。这种方法用来对主飞行控制系统进行验证试验。第三种叫作CASH(Computation and Simulation of HiMAT,计算和仿真),它使用驻留在计算机里的主控制规律和辅助控制规律,当然这些计算机与飞行中使用的计算机是一样的。     

基于FlightGear的制导弹药飞行实测数据可视化研究

为分析飞行数据是否满足飞行性能要求,观测飞行过程中制导弹药部件间的相对运动,应用FlightGear飞行模拟平台,研究了制导弹药三维模型建模方法、可视化场景绘制技术、飞行实测数据的处理方法和三维模型的实测数据驱动技术,构建了制导弹药飞行实测数据驱动的数据可视化系统,实现了制导弹药飞行过程的多视角可视化,直观再现了制导弹药飞行过程中的飞行轨迹以及不同部件之间的相对运动关系,为判断制导弹药飞行数据有效性和飞行控制过程等提供了可视的技术手段。     

地地战术导弹制导控制系统仿真

建立了包括外弹道、内弹道和控制系统在内的导弹制导控制系统数学模型,用数值积分法将数学模型转化为计算机程序,仿真了导弹飞行过程中的制导与控制.仿真曲线、数据与地面试验和靶场飞行试验结果的对比分析,验证了仿真模型的正确有效性.     

激光制导炸弹半实物仿真模型的校核与验证

为了检验激光制导炸弹半实物仿真模型的准确性,建立了激光制导炸弹的飞行动力学、运动学方程及其计算程序,将激光制导炸弹、激光目标模拟器、五轴转台与仿真计算机联接,构建半实物仿真系统,进行半实物仿真实验,获得仿真数据;运用制导炸弹的概念和飞行力学理论校核仿真模型的正确性;利用无人机挂载激光制导炸弹实施投弹试验,分析、对比试验数据与仿真数据,验证仿真模型的准确性.     

导弹与火箭计算机辅助分析系统

介绍了导弹与火箭计算机辅助分析系统的研究方法、软件组成和各模块的功能，用于陆军导弹与火箭武器的总体方案分析、基准弹道与主要设计参数分析、导引弹道分析与设计(对导弹)、系统动力学分析与设计(对导弹)、弹体外形分析与设计、发动机内弹道仿真、外弹道仿真(含控制飞行性能仿真和扰动飞行性能仿真)、作战过程模拟对抗及作战效能分析．通过实例验证了软件的正确性，详细介绍了软件的应用。     

某型自转旋翼无人机半实物仿真系统

针对某型自转旋翼无人机飞行控制,设计一种半实物仿真系统。介绍半实物仿真系统功能及组成、平台总体设计,详细论述系统硬件、软件设计,并对系统进行仿真试验。结果表明,该半实物仿真系统能真实地模拟自转旋翼无人机飞行控制系统运行环境,验证飞行控制系统逻辑功能及品质,缩短此型号的自转旋翼无人机研制周期。     

某小型低空高速无人机控制律设计与仿真

利用自动控制理论的知识,分析并建立了某小型低空高速无人机飞行控制系统的控制律,并采用飞机小扰动运动方程进行了初步的验证计算。利用飞机系统仿真的方法,采用飞机全量扰动运动方程对该型无人机飞行控制系统的控制律进行了仿真验证,结果表明,文中所设计的该型无人机飞行控制系统的控制律可以实现该无人机安全发射、稳定爬升、高度稳定、姿态稳定、航向稳定的要求,进而可以实现无人机按预定航路的飞行。     

无人机飞行控制计算机中的FlexRay 总线节点设计

为解决基于CAN总线的飞行控制计算机总线通信带宽受限问题,笔者根据新型分布式结构飞行控制计算机对内部总线通信信息传输的要求,设计了基于MPC565为中央处理单元的FlexRay总线节点。详细介绍FlexRay总线节点硬件设计特点、通信控制器配置和通信软件开发等。通过模拟分布式结构飞行控制计算机工作状态的测试环境,测试与验证FlexRay总线节点实时数据接收和发送的功能与性能。测试结果表明:该方法满足设计要求,可为解决新型分布式无人机飞行控制计算机内部通信瓶颈奠定坚实基础。     

一种无人机自主航线控制策略

为控制无人机按预定航线飞行,提出一种无人机自主飞行控制策略.介绍自主飞行控制策略和控制律,包括在水平方向上的飞行控制规律和在竖直方向的飞行控制规律,分析软件流程图和半物理仿真系统,并进行无人机半物理仿真.仿真结果表明:该控制策略易编程实现,可靠性好,可有效完成无人机自主航迹飞行.     

基于自适应控制器的无人机飞行控制系统研究

针对一种大展弦比、V形尾翼常规布局小型无人机,在低空低速大扰动条件下飞行的飞行控制策略进行了研究.对无人机运动状态建模分析,设计了一种自适应PID控制器,采用六自由度非线性运动模型进行控制率的仿真验证,并将算法融合在定姿、定高和定航迹跟踪飞行控制实验中.仿真及实际飞行实验结果表明,所设计的自适应PID控制器有效的抑制了大扰动条件下对飞机姿态、位置的影响,满足了飞行任务的需求,并获得了良好的动态性能指标.     

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.