一种惯性导航与瞄准线稳定组合的陀螺平台设计

阐述了惯性导航平台与瞄准线稳定平台对稳定回路设计的不同要求。针对雷达／惯性中段制导、红外末段制导的需要,设计一种惯性导航与瞄准线稳定组合的三轴陀螺平台,惯性测量器件与红外探测器件均置于平台之上。平台选用速率陀螺反馈,通过极点配置的方法设计了一种PⅡ2加前置滤波器的校正形式,能够实现较大的平台进动速率和保证平台稳定角度无静差。获得了较好的动静态性能,实验验证同时满足了惯性导航系统与瞄准线稳定系统的性能要求。     

惯性平台结构系统振动特性的实验分析与控制

应用动态测振实验和分析方法,针对某型号平台系统在生产和调试过程中出现的动、静态测试参数不一致的问题进行了分析.通过对平台结构系统进行了大量振动实验,测出了平台结构系统的动态特性,找出了产生问题的主要原因.结合惯性平台回路系统和控制系统,提出了简单有效的控制方法,并进行了实验验证.     

惯性平台结构系统振动特性的实验分析与控制

应用动态测振实验和分析方法，针对某型号平台系统在生产和调试过程中出现的动、静态测试参数不一致的问题进行了分析。通过对平台结构系统进行了大量振动实验。测出了平台结构系统的动态特性，找出了产生问题的主要原因。结合惯性平台回路系统和控制系统，提出了简单有效的控制方法．并进行了实验验证。     

基于RBF算法的前馈惯性稳定平台PID控制回路的设计

在数字惯性稳定平台系统中,由于无法实现前馈惯性稳定平台控制回路的全补偿条件,控制回路的稳定精度和跟踪能力仍提高有限.针对这一问题,采用以RBF单神经网络自动校正比例、微分、积分3个参数的算法来提高控制回路性能,研究结果表明:采用该算法的控制回路在跟踪能力上明显优于传统PID控制回路,该算法在阶跃响应时不仅超调量满意,而且上升时间与调节时间非常理想,跟踪误差小于千分之一,同时对于惯性稳定平台控制回路参数的摄动以及输出扭矩的干扰都有很强的自适应能力.     

液浮陀螺仪全温动态调参再平衡电路的研究

基于通用LVDT(线性可变差动变压器)信号调节器件AD698,本文给出了一种可在全温工作范围(-40℃～ 65℃)内自动调节陀螺仪闭环回路动态特性参数的陀螺仪再平衡电路,它与YST-02A型单自由度液浮积分速率陀螺形成闭环回路,用于某型号地空导弹.该再平衡电路首次应用了PI校正环节,使系统由Ⅰ型系统变为Ⅱ型系统,实现了陀螺仪无速度位置误差跟踪,大大提高了陀螺仪的动静态性能.     

液浮陀螺仪全温动态调参再平衡电路的研究

基于通用LVDT(线性可变差动变压器)信号调节器件AD698，本文给出了一种可在全温工作范围(—40℃～ 65℃)内自动调节陀螺仪闭环回路动态特性参数的陀螺仪再平衡电路，它与YST—02A型单自由度掖浮积分速率陀螺形成闭环回路，用于某型号地空导弹。该再平衡电路首次应用了四校正环节，使系统由I型系统变为厦型系统，实现了陀螺仪无速度位置误差跟踪，大大提高了陀螺仪的动静态性能。     

惯导平台稳定回路的高精度控制方法对比分析

平台式惯性导航凭借其独特的优势被广泛运用于工程领域中。导航精度是衡量惯性导航系统性能优劣的重要指标,而平台惯性导航系统的精度绝大程度上取决于稳定回路的控制方法。以某型号的惯性平台稳定回路为例,介绍了几种常见的高精度平台稳定回路控制技术:PID控制、模糊PID控制、多环控制和滑模变结构控制,并通过仿真对比分析了4种控制策略的可行性与优缺点,对研究稳定回路的高精度控制具有积极的指导意义。     

基于FTA的平台系统调平故障模式分析

阐述了平台系统调平回路和稳定回路工作原理，并针对某型号平台系统调平电流异常问题，用故障树分析方法(FTA)对平台调平异常问题的各种故障模式进行了分析。     

扰动观测器在惯导平台稳定回路中的应用方法

惯性技术的发展对惯导平台稳定回路稳定性、抗干扰性等性能的要求越来越高,但摩擦力矩以及其他各种干扰力矩对稳定回路性能的进一步提高产生了严重影响。为了有效克服这些干扰力矩对稳定回路性能的影响,在传统比例微分积分(PID)方法对稳定回路进行控制的基础上,提出了一种利用扰动观测器来抑制干扰力矩以提高稳定回路性能的方法。通过利用回路中力矩电流和角速度信息构成扰动观测器,对作用于平台系统的干扰力矩进行抑制。仿真结果表明,扰动观测器的引入没有影响原有PID控制稳定回路的动态性能,且能够对干扰进行有效的抑制,提高了稳定回路的稳定精度和抗干扰性。     

基于dSPACE 的光电稳瞄半实物仿真系统设计

为了提高光电稳瞄控制系统的设计能力,提出一种以dSPACE作为硬件平台的设计方法。介绍了dSPACE实时仿真平台的原理、配置和稳瞄接口电路,建立了稳瞄伺服控制系统的模型,并针对该模型设计了速率稳定回路、位置回路和跟踪回路控制器。试验结果证明:隔离度达到2.1%,120°阶跃时间小于1.2 s,满足瞄准线稳定的要求。     

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.     

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.     

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.