巡航导弹鲁棒轨迹线性化控制器设计

基于轨迹线性化控制方法研究了巡航导弹控制器的设计问题。考虑到系统建模误差和外界干扰等不确定因素对TLC控制器性能的影响,研究了鲁棒轨迹线性化控制方法,设计了相应的控制器,并采用Lyapunov方法严格证明了闭环系统所有误差信号一致最终有界。最后应用新控制方案设计了巡航导弹飞行控制系统,仿真结果表明了方法的有效性。     

基于状态观测器的高超声速滑翔飞行器控制系统设计

以再入滑翔飞行器为研究对象,基于状态观测器设计了高超声速滑翔飞行器控制系统.为了满足高超声速滑翔飞行器高精度、高稳定控制的要求,针对滑翔飞行过程中可能存在的测量误差等不确定性因素,在快慢回路假设的基础上,基于轨迹线性化方法分别设计了快慢回路状态观测器,分析表明,基于轨迹线性化状态观测器-轨迹线性化控制器设计的控制闭环回...     

防空导弹侧向过载积分变结构控制研究

防空导弹在作大机动飞行时，弹体气动参数剧烈非线性变化。在分析弹体特性的基础上，采用积分变结构控制（IVSC）方法设计了侧向过载控制器，通过积分稳定控制回路，保证了高精度稳态传输比，利用变结构控制回路增强控制系统对弹体参数摄动的鲁棒性。仿真结果表明：设计的控制器稳态精度和鲁棒性能指标优良。     

防空导弹侧向过载积分变结构控制研究

防空导弹在作大机动飞行时,弹体气动参数剧烈非线性变化.在分析弹体特性的基础上,采用积分变结构控制(IVSC)方法设计了侧向过载控制器,通过积分稳定控制回路,保证了高精度稳态传输比,利用变结构控制回路增强控制系统对弹体参数摄动的鲁棒性.仿真结果表明:设计的控制器稳态精度和鲁棒性能指标优良.     

基于单隐层神经网络的空天飞行器鲁棒自适应轨迹线性化控制

研究了一种新的空天飞行器鲁棒自适应轨迹线性化飞行控制系统设计方案。利用单隐层神经网络的逼近能力在线估计系统中存在的不确定性，神经网络输出用以抵消不确定性对轨迹线性化方法控制性能的影响。鲁棒自适应控制器用以克服逼近误差，并使闭环系统具有更好的性能。严格的理论证明表明，给定的自适应调节律能够保证闭环系统跟踪误差最终收敛至任意小紧集。空天飞行器高超声速飞行条件下的仿真结果表明，即使在很恶劣的条件下，新方法仍然表现出很好的响应性能。     

滑翔制导炸弹变增益鲁棒控制器设计与仿真

针对滑翔制导炸弹,提出了一种变增益鲁棒控制器设计方法.通过将作战空域划分为几个小空域,并在其中一边界点对线性化后的系统,采用双回路鲁棒设计方法,设计满足系统性能和动态性能的鲁棒控制器.然后在各个边界点,采用插值方法将控制器内回路设计成与高度和速度相关的连续变增益控制回路,使内回路控制参数随着滑翔制导炸弹的飞行状态变化而变化,从而提高系统的性能.仿真结果表明,设计的控制器具有良好的时域响应性能,可以控制滑翔制导炸弹在大范围飞行过程中稳定,获得了满意的控制效果.     

混合H2/H∞鲁棒控制在飞行器控制中的应用

利用混合H2／H∞。鲁棒控制技术设计了某型飞行器运动控制系统。用小扰动方法对飞行器非线性运动控制系统进行线性化，之后建立了混合H2／H∞。鲁棒控制问题的系统模型，设计了H2／H∞鲁棒控制器，使飞行器运动系统有较大的鲁棒稳定性同时满足一定的鲁棒性能要求。仿真结果表明，系统具有满意的鲁棒稳定性和闭环噪声抑制性能。     

四旋翼飞行器鲁棒自适应姿态控制器设计

为实现四旋翼飞行器姿态的稳定控制,针对该系统的非线性、易受外界干扰和参数摄动影响等问题,提 出一种鲁棒自适应控制方法。首先通过分析四旋翼飞行器的工作原理,建立了动力学模型;其次在线性化飞行器模 型的基础上,设计了基于最优二次型鲁棒伺服控制方法的姿态控制器;然后应用模型参考自适应控制方法设计了自 适应补偿器消除系统不确定性的影响;最后对加入了鲁棒自适应控制的飞行器进行仿真。仿真结果表明：该控制器 具有稳定精确的指令跟踪性能和强鲁棒性,能够在复杂环境下实现稳定良好的姿态控制。     

无人机倾斜转弯非线性飞行控制系统设计

研究无人机(UAV)的倾斜转弯(BTT)飞行控制系统的设计方法，解决UAV高机动倾斜转弯飞行时运动强烈耦合、气动特性强非线性和参数非定常性等特性带来的飞行控制系统设计难题。采用线性二次型最优调节规律对UAV非线性运动零动态系统进行增稳调节；运用非线性控制系统中精确反馈线性化方法对UAV非线性系统进行线性化处理；运用滑模变结构控制方法设计了UAV的BTT控制规律，得到由增稳最优调节规律和滑模变结构控制规律构成的UAV的BTT非线性鲁棒飞行控制系统。基于无人机六自由度非线性动力学模型，进行BTT非线性飞行控制系统数字仿真，仿真结果表明：该控制系统即使在扰动条件下也能达到满意的控制品质，控制糸统的鲁棒性和控制精度能满足UAV高机动倾斜转弯飞行时的控制要求。     

高超声速飞行器自抗扰轨迹线性化控制器的优化设计

为了进一步提高自抗扰轨迹线性化控制方法的工程实用价值,对基于自抗扰轨迹线性化的再入飞行器姿态控制器进行了优化设计。首先,分别对开环前馈控制器和闭环误差反馈控制器的优化机理进行了分析。接着,基于该优化机理,分别对开环前馈控制器和闭环误差反馈控制器进行了优化设计。仿真结果验证了所提优化控制器方案的合理性和有效性,能够满足高超声速飞行器的快时变、高精度以及强鲁棒的控制需求,进一步提高了自抗扰轨迹线性化控制方法的工程实用价值。     

Expert Systems Aimed at General Design of Projectiles

Expert systems aimed at the general design of projectiles can implement a series of intelligent designs, such as the design of HE shell, the scheme expounded and proved, the emulation analysis and calculation, etc. Aiming at the product design feature, the expert system adopts the object-oriented knowledge representation and all kinds of inference control engines to describe and reason the relevant knowledge regarding the product through the microcomputer. It embodies the foundation of emulation analysis and simulated manufacturing of the shell. It makes use of the method that knowledge expression is combined with condition of inference to carry out the overall design and emulation and reference.The paper gives the ways through which the functions can be achieved, gives the modularization of reference and the design methods of systematization, puts forward the method of knowledge expression and working interface, and supplies a platform for similar products of the shell category that can be quickly designed.     

Three-dimensional Numerical Simulation of Combustion Field in the Combustion Chamber

In order to study the effect of rotation on the combustion in the underwater vehicle, a two-phase turbulent combustion process is described with Reynolds stress turbulence model, eddy-dissipation turbulent combustion model, P-1 radiation model and particle tracking model of liquid. The flow in the rotating combustion chamber is simulated at two different working speeds, 0 r/min and 1 000 r/min by Fluent software. The temperature, gas velocity, static pressure of wall and fuel concentration are computed and compared. The results show that the combustion in rotating combustor is faster and more effective.     

Software Communication Architecture Implementation and Its Waveform Application

This paper attempts to do a research on the development of software defined radio（SDR） based on software communication architecture（SCA）. Firstly, SCA is studied and a whole reference model of SCA3.0 core framework （CF） is realized; Secondly, an application-specific FM3TR waveform is implemented on the platform of common software based on the reference model; Thirdly, from the point of view of real-time performance and software reuse, tests and validations are made on the above realized CF reference model and FM3TR waveform. As a result, the SCA-compliant SDR has favorable interoperability and software portability and can satisfy the real-time performance requirements which are not too rigorous.     

Parameter Identification for the Valve Control Cylinder System of a Hydraulic Manipulator

In mechanical, hydraulic and electronic systems, the determination of system parameters is often challenging because liquid parameters often change significantly, due to variations in working and environmental conditions. Therefore, it is of significant practical importance to identify those parameters through experimental procedures. A systematic approach to identifying parameters in the valve controlling cylinder system of hydraulic manipulators is provided. It first derives the transfer function of the system, and then uses P control of PID control to predict system parameters. The predicted parameters are further validated using PID control. The prediction through simulation using MatLab language is utilized, which agrees well with experimental results.     

Dynamic Simulation of the Tank Gun Recoil Response

By using the ATV module of MSC. ADAMS, the dynamic simulation of recoil response of tank gun is analyzed.How the recoil force affects the bodywork and the suspension during gun firing, as well as the changing status of the gun muzzle‘s velocity are gained. All results and analyzing methods are offered for the designing basis of optimizing tank vehicle-gun match. The constructive exploration is beneficial to improving the general capability of tank.     

Survey of Controllable Suspension System for Off-road Vehicles

The controllable suspension system can improve the performances of off-road vehicles both on road and cross-country. So far, four controllable suspensions, that is, body height control, active, semi-active and slow-active suspensions, have been developed. For off-road vehicles, the slow-active suspension and the semi-active suspension which have controllable stiffness, damping and body height are more appropriate to use. For many years, some control methodologies for controllable suspension systems have been developed along with the development of modern control theory, and two or more original control methods are integrated as a new control method. Today, for military or civilian off-road vehicles, the R&D of controllable suspension systems is ongoing.     

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.     

An Efficient Key Agreement Framework to MANET

Protocols for key management are compared and evaluated from the point of view on mobile ad hoe networks （MANET）. The issues of fault-tolerance and efficiency of key distribution protocols for group communications in MANET are addressed. Most key distribution protocols existing today are primarily designed for wlre-line networks. These protocols either fail to work as intended or cannot work at all when they are applied to the demanding environment of MANET. Parameters and performance of different protocols are analyzed, and then a fiat is given out, on which new protocols or existing ones are designed and modified, so that they can be robust, scalable and efficient in MANET.     

Finite Element Analysis of Fretting Behavior Between an Engine Cylinder Block and a Main Bearing Cap

The finite element analysis of the fretting behavior between a cylinder block and a main bearing cap is presented. The stresses, relative fretting slip, fretting friction work parameter W and crack initiation location parameter G on the fretting contact surface of the cylinder block are obtained and analyzed. It shows that the fretting fatigue problem of the cylinder block can be quantitatively explained by W or G. The effects of pretightening force, friction factor and material combination of the cylinder block and the main bearing cap are studied. The computational results indicate that the fretting fatigue of the cylinder block can be allayed by increasing the elastic modulus of the cylinder block, but not by changing the other two factors.     

A Physical Model of Electromagnetic Force from PEMA Acted on Metal Projectiles

Electromagnetic armor is a new conceptual combat vehicle technology, which improves remarkably the defensive capability and maneuverability of vehicles. The authors present definitely to apply the electromagnetic theory to analyze the electromagnetic armor. Based on electromagnetics, the experienced expression of projectile and the physical model of PEMA （passive electromagnetic armor） are obtained when electric current flows through the system, and a computer sim- ulation is given.