防空多管火箭炮位置控制器的模糊滑模设计

针对防空多管火箭炮交流位置伺服系统转动惯量和负载力矩变化大等特性,设计了基于模糊滑模控制的位置控制器。利用模糊控制调整滑模切换部分的控制,使系统对内部参数变化和外部干扰等不确定项均具有全局鲁棒性。仿真结果表明该控制策略不仅保证了系统的静、动态特性,而且有效消除了系统的抖振现象。     

某舰载火箭炮交流伺服系统并行复合控制方法

针对舰载火箭炮在发射过程中会受到风浪以及自身扰动的影响而导致射击精度和稳定性降低的问题,提出一种RBF神经网络滑模-模糊PID控制方法。利用RBF神经网络来削弱滑模的抖振,在误差较小时提高响应速度和鲁棒性;利用模糊规则对PID参数进行调整,在误差较大时提高控制精度。仿真结果表明：该复合控制策略可使舰载火箭炮交流伺服系统具有更高的射击精度和反应速度,提高系统性能。     

自适应反演滑模控制在火箭炮交流伺服系统中的应用

针对某火箭炮俯仰运动的位置控制问题,采用了一种自适应反演滑模控制方法.自适应反演控制律保证了闭环系统最终有界,使伺服系统能够全局渐进跟踪参考位置指令,从而达到交流伺服系统稳定跟踪控制的目的,滑模控制抑制了模型参数摄动和外界干扰的影响.通过不同条件下的仿真研究,分析了自适应机制和滑模控制在运动控制中的作用,结果表明该方法...     

火箭炮交流位置伺服系统滑模变结构控制策略

对多管火箭炮负载特性，转动惯量变化规律及其燃气流冲击力矩作用规律进行了定量分析，基于此设计了多管火箭炮交流位置伺服系统结构并提出了滑模变结构控制策略，对其具体控制结构的形式进行了分析，提出了统一滑模变结构控制和串级滑模变结构控制两种方案。最后给出了两种滑模变结构控制结构的计算机仿真结果，结果表明该控制策略具有较强的抗负载扰动能力和参数鲁棒性，可以适应多管火箭炮的负载干扰力矩以及转动惯量的变化。     

带积分项的火箭炮最优化滑模伺服控制

针对某防空火箭炮交流位置伺服系统负载、参数大范围变化以及发射时具有强干扰力矩的特点,提出了带积分项的基于最优化的滑模变结构控制方法并设计了控制器。计算机仿真结果表明,该控制器不仅消除了经典控制所存在的静差,同时对负载扰动和系统参数摄动具有较强的鲁棒性,并保证了系统的瞬态性能指标。     

基于复瞄的某火箭炮位置伺服系统研究

火箭炮在发射状态时存在燃气流冲击力矩等强干扰,使得发射后炮管偏离初始位置,故提出基于复瞄的火箭炮伺服系统控制。以火箭炮伺服系统为对象,建立系统数学模型,在此基础上运用自抗扰理论设计了非线性扩张状态观测器及相应的控制律,来减弱燃气流等强扰动对系统发射精度的影响,提高火箭炮的复瞄速度与精度。数字仿真结果显示,系统具有良好的跟踪性能,并且在燃气流冲击等干扰下能够很快返回初始位置,证明了该方法的有效性。     

基于RBF+NTSMC的舰载火箭炮随动系统控制研究

针对舰载火箭炮控制系统存在火箭炮射速、跟踪精度的问题,提出了一种基于RBF神经网络的非奇异终端滑模控制(NTSMC)策略。基于非奇异终端滑模控制强鲁棒性的特点,用RBF神经网络对未建模动态进行自适应逼近,将RBF神经网络与非奇异终端滑模控制相结合,既保持系统良好的鲁棒性又提高了火箭炮发射精度。仿真结果表明:与传统的NTSMC相比,该控制策略有效地提高舰载火箭炮系统的响应速度、鲁棒性以及发射的命中精度。     

火箭炮自动操瞄系统动态滑模控制

火箭炮自动操瞄系统包含俯仰/方位子系统,两子系统联动时存在轴间耦合非线性力矩,影响到系统的控制精度,甚至使得系统发散。针对上述特性,对系统进行输入输出解耦线性化,并在此基础上引入动态滑模控制方法,设计火箭炮操瞄系统位置控制器,实现火箭炮高精度操瞄。文中仿真对比了传统滑模与动态滑模控制方法的控制特性,结果表明,动态滑模控制方法优于传统滑模控制方法,能够高精度、快速平稳的实现自动跟踪。     

火箭炮位置伺服系统自抗扰控制

针对火箭炮发射时燃气流冲击干扰强和系统参数变化大的特点,以含有速度闭环的实际伺服系统为对象,建立系统模型并进行频域分析,建立了系统的低频和中频近似模型,并在此基础上分别设计了火箭炮位置伺服系统2阶和3阶线性扩张状态观测器及相应的自抗扰控制律,估计系统未建模干扰并在控制输入中予以补偿。比较分析了设计的自抗扰控制律和传统PID控制在伺服跟踪和燃气流冲击干扰下的控制效果。仿真结果表明,火箭炮伺服系统采用提出的控制方法能有效提高跟踪精度,充分抑制燃气流冲击干扰引起的发射平台振动,保证后续射弹命中精度。     

火箭炮位置伺服系统模糊自适应滑模控制

针对火箭炮位置伺服系统强耦合、变负载、非线性的特性,提出了一种具有积分滑模面的模糊自适应滑模控制方法。为了使控制律不依赖对象的精确数学模型,利用模糊系统的万能逼近原理,设计了一个模糊系统,实现了理想控制律的逼近。为了抑制滑模抖振,设计了基于切换增益的自适应律,实现了系统参数的动态调节。仿真研究表明,该方法不仅保证了系统的动、静态品质,有效削弱了控制信号的抖振,而且对参数的不确定性具有较强的鲁棒性。     

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.