CZ-2F火箭遥测仿真系统

CZ-2F火箭遥测仿真系统作为地面逃逸判决软件的测试系统已经成功地应用在载人航天工程首次载人飞行任务中.本文对遥测仿真系统的研制原则、研制任务和系统硬件结构、软件结构及软件、系统功能、系统特色等方面进行了介绍.     

载人运载火箭最大化利用有限遥测容量的方法研究

CZ-2F运载火箭是中国唯一的载人运载火箭型号,在遥测系统领域具有特别的要求.随着日新月异的科技发展和技术进步,载人火箭对测量的精细化,飞行判定的准确性的需求不断提高.通过分析总结载人运载火箭在遥测系统领域需求特点,结合相关领域的技术发展变化,提出了适合中国载人运载火箭在有限遥测容量下,利用多种路径实现资源利用的最大化...     

CZ-2F火箭可靠性技术

对载人运载CZ-2F在研制过程中应用的可靠性技术和开展的可靠性工作进行了介绍,包括可靠性设计、分析、试验和管理等.CZ-2F火箭可靠性技术为载人首飞成功奠定了坚实的基础.     

高加速度遥测系统的研究

本文介绍的高加速度无线电遥测系统在承受20,000 Gal以上直线加速度及23,000 rpm~(-1)以上高速旋转的恶劣环境条件下可以稳定可靠地工作。它可用于火箭、炮弹的弹道参数及其内部部件工作参数的测量,也可以用于其他高速离心工作状态下的各种设备及器件的测量。文章详述了高强度的遥测发射机及高频塑封技术、采用厚膜集成技术的高频率稳定度的副载频振荡器、飞行校准器等部件,还介绍了快速捕捉信号的自动调谐接收机、过渡过程极短的解调器,最后,给出了此系统实际应用及实验实例。     

某型号液体火箭飞行末段推进剂夹气影响分析

通过判读某型号液体火箭的燃烧室压力等异常遥测参数，对引起一级飞行末段火箭发动机燃烧室压力下降原因进行了故障定位，分析了产生推进剂输送管路夹气的机理；针对推进剂夹气对发动机系统、姿态控制系统的影响程度进行了重点分析，并提出调整推进剂加注量来消除故障，完善了火箭设计方案。     

运载火箭飞行载荷测量与分析

为获取运载火箭结构在飞行过程中准确的截面动态载荷,基于应变测量原理设计了一套飞行载荷测量系统,通过多向载荷标定试验获得结构的灵敏度矩阵,采用非线性载荷模型将飞行过程测量的应变响应转换为截面的动态飞行载荷。在某型号中首次开展了运载火箭飞行载荷测量工作,获得了二级箱间段和有效载荷支架在整个飞行过程中的轴向力、弯矩载荷,并与飞行时序、地面模态试验结果进行了详细对比,结果表明：2个部段的飞行载荷数据质量良好,飞行载荷有变化的时段均与飞行时序对应,并与过载的遥测结果趋势一致,同时也发现了多项飞行动态载荷的特点,为载荷设计提供了数据支撑,有助于后续型号的优化与改进设计。     

基于火箭遥测的星箭天线方向监视方法

在入轨段测控任务中,为了实时监视火箭和卫星的天线方向性,基于测量船跟踪计算软件的实际,通过分析入轨段火箭飞行姿态、位置等测量数据,设计利用火箭实时遥测数据计算火箭和卫星天线方向性的方案,规定了具体流程,并通过实例计算,验证了该方法的可行性。     

高码率全程天基测控关键技术研究

随着未来运载火箭技术不断发展,对下行遥测参数的数据量需求大大增加。目前中国运载火箭的飞行测控主要依赖地面测控站和测控船分段接力实现全程遥测数据接收、外弹道测量,对于地面测控网络的依赖程度高。随着中继卫星网络的逐步建设,现役运载火箭部分飞行段已经开始依靠天基下传少量关键遥测数据。本项研究突破了多星/多天线智能切换技术、自适应跟踪中继星技术、瓦片式相控阵天线、高效双向递归编码算法等关键技术,为实现火箭飞行全程高码率的天基测控奠定技术基础。     

引信天线罩形变遥测图像动态测试方法

针对传统形变测试方法不适用于在高速、高温、高过载的恶劣环境中进行引信天线罩形变动态测试的问题,提出一种基于遥测的非接触式引信天线罩形变动态测试方法。该方法将CMOS图像传感器安装在天线罩内部,对飞行过程中引信天线罩内表面进行在线拍摄,将拍摄到的图像利用无线遥测传输到地面,通过地面图像分析和特征解算获得引信天线罩的变形量曲线。其中变形量计算的关键技术采用了Hough圆检测方法,具有精度高、抗干扰能力强等优点。实验结果表明,该方法满足天线罩动态测试需求,能够测量出天线罩飞行过程中产生的形变量。     

火箭滑车激光测速系统

对火箭滑车自身动态参数的精确测试是试验顺利进行的基本条件。本文介绍了一种用于测量火箭滑车速度的激光测试系统。它具有体积小、结构简单、可靠性性高、成本低等优点。文中详细描述了该系统的结构及其工作原理,并给出了实测曲线。实验表明这是一种直接的、有效的测量方法。     

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.     

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.     

Experimental Research on Output Performances of Giant Magnetostrictive Actuator

The paper introduces the performances of magnetostrictive actuators and its applications, discusses the design methods for the structure and internal magnetic circuit of a giant magnetostrictive actuator, and makes tests on the output displacement and force characteristics for an actuator using homemade magnetostrictive material. The experimental result shows that the actuator has satisfactory output precisions and ranges in transient and stable states, and can be used in lowfrequency vibration control system of precise equipment.     

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.