垂直命中机动目标的鱼雷三维拦截导引律设计

本文研究了三维空间中鱼雷垂直命中机动目标的最优导引律设计问题。首先将拦截几何的非线性模型变为模糊 T- S线性模型 ,然后利用 RH控制方法和伴随技术 ,在目标作对抗性机动条件下 ,获得了垂直命中机动目标的三维拦截导引律。仿真结果表明 ,这种导引律能够达到较高的点命中和角命中拦截精度。     

基于扩张状态观测器的反鱼雷鱼雷迎面拦截制导律

基于雷目相对运动方程,把迎面拦截问题描述成具有终端角约束的最优控制问题,针对鱼雷自导头难以测量视线角速率的难题,提出了一种基于扩张状态观测器的目标视线角速率实时在线估计方法,同时估计出目标机动引起的不确定干扰量,并基于线性化的侧向运动方程求解出反鱼雷鱼雷舵角控制指令,从而实现了含有干扰补偿的迎面拦截最优制导律。仿真结果表明,与传统的比例导引律相比,该最优制导律具有很好的迎面拦截效果。     

拦截跳跃式机动目标的制导律设计

针对攻击型临近空间飞行器的跳跃机动突防对常规拦截导弹提出的挑战,本文首先建立了视线坐标系下的三维弹-目相对运动方程,引入目标跳跃幅度变化率估计目标跳跃机动的能力,基于滑模变结构控制理论,设计了随弹-目距离和目标跳跃幅度变化率自适应调节的滑模趋近律,推导了视线坐标系下导弹的三维制导律。其次,采用轨控直接力控制技术,设计了直接力/气动力复合控制的分配方案。仿真结果表明:采用该制导律与控制策略的拦截弹能够精确拦截高速、大机动目标,同时拦截弹弹道平缓,需用过载和能量消耗均较小。     

带初始前置角和末端攻击角约束的偏置比例导引律设计以及剩余飞行时间估计

针对导弹飞行过程中受到外部干扰导致前置角变化较大的问题,设计了满足任意初始前置角和末端攻击角度约束的偏置比例导引律,并对该导引律下系统参数的收敛性给出了证明。基于现有分段迭代求解剩余飞行时间的方法进行拓展,解决了现有分段迭代求解方法在前置角等于π/2 rad时存在奇点的问题,并用该改进方法给出了该导引律的剩余飞行时间估计。对提出的导引律和改进的分段迭代求解方法进行仿真,结果表明：该导引律能够满足任意初始前置角和末端攻击角度约束下导弹的脱靶量和末端角度要求,且在飞行末端加速度指令收敛至0;与以往研究结果相比,该导引律在前置角大于π/2 rad时能够实现对导弹的更有效控制;使用改进的分段迭代求解方法对提出的导引律进行剩余飞行时间估计,估计误差小,误差收敛快。仿真结果验证了该偏置比例导引律和剩余飞行时间估算方法的有效性。     

基于模糊变系数策略的迎击拦截变结构制导律设计

迎击拦截是拦截问题中常见的一种制导方式。为提高拦截器的末制导精度,基于变结构控制设计零化视线角速率的变结构制导律是一种典型方法。对高速目标的迎击拦截出现相对速度过大,目标机动能力引起的导引初段需用过载过大的问题,应用模糊控制设计制导律的导航项及变结构项系数随剩余导引时间变化的策略以延长系统进入滑模面的时间,使系统进入滑模面的同时有效减小末制导初段的控制量。建模及仿真结果显示,该制导律在使视线角速率收敛的同时显著地减小了导引初段的需用过载,验证了该方法的有效性及对传统比例导引律的优越性。     

基于模糊逻辑的前置点导引和无干扰导引的混合导引律

基于模糊逻辑理论,文中提出了一种能自动实现前置点导引和无干扰导引的混合导引律.该导引律通过两组误差信号和多目标规则库,使得水下航行器可在无干扰导引法和前置点导引法之间自由切换,避免了传统方法需要人工切换的缺陷,所设计出的模糊导引律不受本艇、航行器、目标自由运动的影响,而且可以连续地适应各种工作环境.     

拦截高超导弹的末制导控制律研究

导弹轨道控制采用改进的比例导引律,针对高超战术弹道导弹的拦截特点,文中在导引律中使用视线角等观测量的预测信息,并与直接使用测量信息的导引律相比较。导弹姿态控制采用模糊PID方法,以提高控制系统的鲁棒性,并与滑模方法相比较。数值仿真结果表明,无论采用哪种姿控方法,使用预测信息导引律的脱靶量都要大大小于使用测量信息导引律的脱靶量;无论采用哪种导引律,模糊PID方法的脱靶量都要优于滑模方法。     

基于主动螺旋变轨的三维末制导律研究

针对解决我方导弹既能够规避敌方拦截导弹又能够准确命中海面机动目标的问题,提出了一种超声速反舰导弹自寻的主动螺旋变轨的三维导引设计方案。首先建立了三者在三维空间中的运动几何关系模型;然后基于自适应变结构控制的思想采用让视线角速率跟踪给定衰减螺旋指令信号的方法使导弹在打击目标的过程中实现螺旋变轨,以逃避敌方导弹的拦截;同时选择合理的参数使弹目间视线角速率在飞行过程中趋于零,以保证我方导弹能够准确命中海面机动目标。仿真结果表明,该制导律既能够使反舰导弹进行主动螺旋变轨,在4.41S使敌方拦截弹的脱靶量达到最小值209.233 m,又能以脱靶量0.932 m的精度命中其机动舰艇。     

反鱼雷鱼雷自适应滑模导引律

针对在目标机动性加大的情况下常规鱼雷导引方法不能满足反鱼雷鱼雷迎面拦截来袭鱼雷需求的问题,为提高反鱼雷鱼雷拦截概率,提出了利用滑模观测/微分器对来袭鱼雷视线角速率进行估计的方法,基于李雅普诺夫稳定性理论,根据准平行接近的原理,推导出一种自适应滑模导引律。将该方法运用于反鱼雷鱼雷跟踪拦截,仿真结果表明,该导引律对干扰和参数摄动具有强鲁棒性,与传统比例导引法相比,其对机动目标的导引精度高,脱靶量小,可以满足反鱼雷战技术的需求。     

垂直命中机动目标的鱼雷三维栏截导引律设计

本文研究了三维空间中鱼雷垂直命中机动目标的最优引导律设计问题,首先将拦截几何的非线性模型变为模糊T－S线性模型,然后利用RH控制方法和伴随技术,在目标作对抗性机动条件下,获得了垂直命中机动目标的三维拦截导引律,仿真结果表明,这种民引律能够达到较高的点命中和角命中拦截精度。     

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.     

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.     

Overview of Anti-tank Mines

First the different anti-tank mines laying possibilities are shortly summarized： hand emplaced, with mine layers, ground or helicopter relatively topographical well defined, and with cluster systems of projectiles, rockets and aircraft dispensers. Then examples of the three generations of anti-tank mines are presented：Ⅰ generation： detonating only beneath the track; Ⅱ generation： detonating beneath the track and belly; Ⅲ generation： mines with off-route actions. Weight and cost comparisons are strongly favoring the off-route Ⅲ-generation mines.     

A Finite Element Analysis on Static Strength of a Complex Section

A static finite element analysis （FEA） of an impulsive controller section is presented. The boundary condition and a part of the loads are applied. Considering the grades of the stress around the holes being large, the dense grids are adjusted accordingly. Four cases with different loads are compared, thus the influences of different loads on the section are analyzed. Numerical results show that the maximum stress of the section is lower than the strength limit of the material, and the section will not be broken with the static loads.     

Discussion on Mechanism of Breech-Blow Caused by Propellant Charge

From the view point of launch safety caused by fracture of propellant charge, this paper points out that the safety criterion of pressure wave is inadequate to evaluate the launch safety of propellant charge based on the initial negative differential pressure and sensitivity tests. Generally, the maximum barrel pressure does not depend upon the intensity of pressure wave correspondingly. The pressure wave intensity can not describe the fracture degree of propellant charge in chamber and reflect the mechanical environment of propellant charge fracturing exactly and wholly. The evaluation criterion for launch safety of propellant charge should be built on the basis of depicting the fracture degree of propellant bed.     

Experimental Studies of Toxicity on HNIW and Its Intermediates

The polycyclic nitramine hexanitrohexaazaisowurtane（HNIW） is a compound of high energy density. HNIW can replace 1, 3, 5-trinitro-1, 3, 5-triazacyclohexane（RDX） or HMX, hut its toxicity is unknown. In this paper, HNIW, hexabenzylhexaazaisowurtzitane （HBIW）, tetraacetyldibenzulhexaazaisowurtzitane （TADBIW）, tetraacetyldiformylhexaazaisowurtzitane（TADFIW） and tetraacetylhexaazaisowurtzitane（TAIW）, which are intermediates of the synthesis of the HNIW, were selected as the tested objects in acute toxicity test, acute eye stimulation test and skin irritation test according to the standards of ＂chemical product testing method-401 ： acute oral toxicity test＂, ＂chemical product testing means-405： acute eye irritation/corrosion test＂ and ＂chemical product testing means-404： acute dermal irritation/corrosion test＂ of National Circumstance Protect Bureau. The results show that all of the five objects have no toxicity, no stimulation to eye and skin under the tested conditions.     

Dynamic Simulation for Missile Erection System

In order to study the dynamic characteristics of the missile erection system, it can be considered as a rigid-flexible coupling multi-body system. Firstly, the actual system is abstracted as an equal and simplified one and then the forces applied to it are analyzed. Secondly, the rigid-flexible coupling dynamic simulation for erection system is accomplished by use of the system simulation software, for example Pro/E, ADAMS, ANSYS, MATLAB/Simulink, etc. Finally, having the aid of simulation results, the kinetic and dynamic characteristics of the flexible bodies in erection system are analyzed.The simulation considering the erection system as a rigid-flexible coupling system can provide valuable results to the research of its kinetic, dynamic and vibrational characteristics.