汽车转向/防抱死制动系统协同误差控制

为了研究汽车转向过程中防抱死制动稳定性问题,提出一种新的协同控制系统.该协同控制结构由转向控制器和制动控制器组成.在汽车转向控制设计中基于主动前轮最优滑模控制器和横摆力矩控制器力求改善汽车动态响应和稳定性.针对转向系统和制动系统之间的补偿控制律难以确定的困难,先定义协同误差和协同模型,然后设计防抱死制动快速终端滑模控制...     

基于干扰观测器的电液位置伺服系统跟踪控制

针对电液位置伺服系统存在匹配和不匹配模型不确定性的问题,提出一种基于滑模的模型不确定性补偿控制策略。通过设计滑模观测器估计电液位置伺服系统的匹配和不匹配模型不确定性,以在控制器设计中将其补偿,有效地削减控制器不连续项增益。将观测器滑模面引入到控制器滑模面中构造新的控制器滑模面,消除不确定性的估计误差,以保证控制器良好的动态性能。此外,不使用系统加速度信息,以降低可测噪声对跟踪性能的恶化。通过Lyapunov稳定性理论验证了闭环系统的全局稳定性。仿真结果显示,与积分滑模控制策略相比,所提方法能够补偿电液位置伺服系统中存在的匹配和不匹配模型不确定性,同时削弱滑模控制的抖振,具有良好的跟踪性能和较强的鲁棒性。     

基于ATSMC的破障武器随动系统控制研究

针对电动缸驱动的车载破障武器随动系统控制问题,提出了一种基于指数收敛的干扰观测器和反正切滑模控制器的方法。研究了电动缸传动时系统具有的非线性增益,推导了电动缸机构的变传动比和变负载力矩的公式。为了对随动系统进行位置和速度控制,根据多项式Terminal滑模控制器的思想,采用等效趋近律的方法,设计了反正切Terminal滑模控制器(ATSMC),其具有全局鲁棒性和有限时间可达的能力;为了对系统内部的不确定性和外部扰动进行观测和补偿,设计了一种基于指数收敛的干扰观测器。对控制系统进行仿真,结果表明,ATSMC具有更好的鲁棒性,提高了随动系统控制精度,缩短了响应时间;基于指数收敛的干扰观测器能较好地补偿系统运行中产生的各种扰动,降低了系统稳态误差。     

超精密加工伺服系统滑模控制技术研究

按超精密加工伺服系统原理建立的交流永磁同步电机伺服系统模型，其控制装置处理输入数控指令和检测系统反馈数据后，送伺服驱动单元数字控制板，经放大器控制电机运转．模型用带扰动观测器补偿的滑模变结构控制。对控制函数切换并受滑动模态控制．由伺服电机转子坐标系电压方程建立的伺服系统数学模型。以电机动态角度期望值和实际角度值描述角误差和角速误差．滑模控制器输入结构为滑模等效控制项、切换控制项、扰动前馈补偿项，其控制参数在线性切换函数中引入积分环节，通过滑模等效条件推导出等效控制，即可得出具有扰动补偿的控制模型．Matlab仿真表明对外在扰动有较强鲁棒性．     

滑模预测控制在纯时滞系统中的应用

针对纯时滞系统跟踪问题,设计一种离散滑模预测控制器.通过引入预测模型来预估未来的输出,从而消除时滞带来的控制误差.用估计输出设计滑模面,计算出对应的滑模控制律,并针对某时滞系统进行跟踪控制仿真实验.结果表明:该控制器可以有效克服时滞,具有良好的跟踪和抗干扰能力.     

无人炮塔火力线跟踪神经滑模控制

针对无人炮塔火力线跟踪动力系统中存在的火力瞄准机构运动使系统动力参数摄动和火炮射击时冲击使系统输入存在外部干扰问题,提出了一种神经滑模控制策略。采用非奇异终端滑模面保证系统状态能够在有限时间内到达滑模面和平衡点;采用径向基函数神经网络自适应地补偿系统摄动和冲击干扰,保证滑模控制在滑模面的运动。应用李亚普诺夫稳定性判据证明了控制器稳定性和火力线跟踪误差收敛性。仿真结果表明,通过神经网络的在线学习实现了火力线位置精确和鲁棒跟踪,并充分抑制了滑模控制中的抖振现象。该方法是有效的。针对无人炮塔火力线跟踪动力系统中存在的火力瞄准机构运动使系统动力参数摄动和火炮射击时冲击使系统输入存在外部干扰问题,提出了一种神经滑模控制策略。采用非奇异终端滑模面保证系统状态能够在有限时间内到达滑模面和平衡点;采用径向基函数神经网络自适应地补偿系统摄动和冲击干扰,保证滑模控制在滑模面的运动。应用李亚普诺夫稳定性判据证明了控制器稳定性和火力线跟踪误差收敛性。仿真结果表明,通过神经网络的在线学习实现了火力线位置精确和鲁棒跟踪,并充分抑制了滑模控制中的抖振现象。该方法是有效的。     

舰炮随动系统的模糊滑模控制

为提升末端反导舰炮的射击精度,提出一种舰炮随动系统的模糊滑模控制方法。采用LuGre 模型对末端 反导舰炮随动系统中的非线性摩擦进行建模,应用滑模控制算法对摩擦力矩进行补偿,通过模糊规则对滑模控制增 益进行调节以降低抖振。仿真结果表明：该模糊滑模控制器减小了控制输入的抖振,提高了随动系统跟踪稳定性和 跟踪精度。     

导弹姿态控制系统的全程模糊滑模控制设计与仿真

结合模糊控制器和变结构控制器的各自优点,给出导弹姿态控制系统的模糊滑模控制,同时为消除模糊滑模控制的能达阶段,在控制器中引入全程滑模因子,最终实现导弹姿态控制系统的全程模糊滑模控制,取得了较好的效果。     

基于积分滑模的BTT导弹鲁棒反演控制律设计

针对不确定非线性强耦合BTT导弹的控制器设计问题,将滑模控制与反演控制思想相结合,在标称模型的基础上进行反演控制器设计.针对系统所存在的模型不确定性和外界干扰,增加一个积分滑模补偿器,提高系统的鲁棒性能.该方法通过合理地设计积分滑模面,保证系统初始状态处于滑模面上,消除了滑模到达阶段,从而有效地提高了系统的鲁棒性.仿真...     

基于干扰观测器的运载火箭助推段姿态控制

针对刚体运载火箭助推飞行段的姿态控制问题,提出了一种基于干扰观测器的自适应滑模控制方法。首先,根据姿态动力学模型建立了面向姿态控制的通用模型。其次,针对通用模型中参数不确定性和外界干扰,设计了干扰观测器实时观测后补偿到自适应滑模控制器中,并结合Lyapunov稳定性理论分析了控制器的稳定性。最后,对比传统的PD控制器,在模拟大气环境中进行了姿态控制系统仿真。仿真结果表明,该方法与传统控制方法相比,控制精度和鲁棒性显著提高。     

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.     

Method for Measuring Velocity of Warhead Fragments Based on Photoelectric Detection

For measuring velocity and impacting position of single fragment of warhead, a non-contact measuring method is proposed, in which a six-light-screen array, a position indicator, a multi-channel chronograph and a computer are used.The principle of measurement is described. The key device of the system is a light screen array sensor which consists of six light screens allocated with certain geometrical parameters. When the fragment flies through the light screen array, the time of passing through each of the screens is recorded by the multi-channel chronograph. According to the time data and the geometrical parameters of the array, the velocity vector and the location of the fragment can be calculated immediately. The presented method can be used to locate the fragment and to measure the real velocity on its flying direction. It can also be used to measure the velocity of a fragment swarm after the system is engineered further.     

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.