基于模糊树逆方法的高超飞行器变质心控制

本文针对高超飞行器变质心姿态动力学模型所具有的高度非线性、多变量、强耦合特性,通过合理的简化,得到了一个耦合的非线性动力学系统;根据简化模型的特点,将该模型分为俯仰偏航通道模型和滚动通道模型,通道间耦合视为扰动.应用模糊树模型逼近俯仰偏航通道的逆模型,实现了俯仰偏航通道解耦线性化,对各线性子系统设计闭环控制器,实现了飞行器俯仰偏航通道姿态角的跟踪;应用预测变结构方法保证了滚动通道的快速稳定并且无抖振现象.最后,将该方法应用于高超飞行器姿态系统控制的仿真研究,表明了本文方法的有效性和可行性.     

BTT导弹变结构自适应控制仿真研究

一种变结构自适应控制律,可以不依赖于系统的精确数学模型,但对于BTT导弹气动参数不确定性具有良好的控制效果.采用Matlab,分别对BTT导弹滚转、偏航以及俯仰三个通道进行数值仿真,接着又对闭环系统进行了仿真验证,根据对仿真结果的分析,对该控制律进行了进一步的改进.所设计的改进控制律很好地解决了导弹数学模型不能精确获得以及参数大范围变化的问题,并且在很大程度上克服了导弹各通道间存在的耦合现象,与其它控制方法比较,具有算法相对简单,并且易于仿真验证的特点,对BTT导弹自动驾驶仪研究具有很好的指导意义.     

航空布撒器倾斜转弯自动驾驶仪设计与仿真

航空布撒器动力学具有非线性、强耦合、大参变的特点.针对动力学模型耦合和气动系数不确定性,给出了倾斜转弯自动驾驶仪的三通道独立设计方法.首先,采用混合灵敏度理论设计俯仰和滚转通道自动驾驶仪,以保证弹体在大空域范围内有较好的指令响应特性和稳定性.针对快速滚转引起的耦合,在偏航通道中引入攻角和滚转角速率信息,实现滚转/偏航运动解耦,抑制侧滑角.全弹道仿真表明,该方法设计的驾驶仪能适应大范围的气动参数变化,具有很好的鲁棒性,并能有效地实现倾斜转弯控制的好r forl coordinated law for yaw channel is givenaft Using .     

卫星制导炸弹参数空间法控制器设计

针对卫星制导炸弹在飞行过程中存在的参数摄动问题,特别是大空域参数时变,经典控制理论所设计的控制器难以满足要求.为消除干扰,保证系统的稳定性,采用参数空间法设计卫星制导炸弹的飞行控制系统,以适应其参数的大范围的变化,提高了控制精度.对某型号卫星制导炸弹,设计了俯仰通道的参数空间法控制律,给出了卫星制导炸弹控制系统计算机辅助设计的算法.数字仿真结果表明,方法能有效地解决卫星制导炸弹参数摄动带来的控制器设计问题,增强了控制系统的稳定性和鲁棒性.     

SSB炸弹俯仰/偏航通道控制系统设计与仿真

SSB炸弹姿态控制系统是一个多种因素耦合的多输入多输出时变系统,俯仰/偏航通道的控制是整个姿态控制稳定性优化的难点问题.为了保证SSB炸弹在飞行过程中俯仰/偏航通道的稳定性以及具有期望的动态品质,给出了一种基于特征结构配置算法的全局状态反馈控制律设计.首先,在SSB炸弹飞行包线内选取有代表性的特征点,应用系数冻结法得到若干局部子系统.然后,配置算法和控制系统设计性能要求,建立局部子控制器设计的优化数学模型.用Matlab工具箱求解子系统数学模型,得到局部子控制器.最后采用一种平滑变增益方法,得到带前馈控制器的全局状态控制律.仿真结果表明,SSB炸弹俯仰/偏航通道控制系统具有良好的解耦特性,对给定过载指令信号具有良好的跟踪特性,满足性能指标要求.     

空空导弹增益调度鲁棒H_∞控制自动驾驶仪设计

为了满足空空导弹大空域、高机动飞行的技术指标要求,提出了BTT导弹的增益调度鲁棒H∞自动驾驶仪设计方法;建立了BTT导弹线性变参数(LPV)系统数学模型;提出了LPV系统增益调度鲁棒H∞控制设计方法和设计过程;通过把BTT导弹自动驾驶仪分为俯仰、偏航/滚转通道分别进行设计,并以俯仰通道为例进行了仿真验证;仿真结果表明该控制算法具有良好的控制性能,从而,验证了增益调度鲁棒H∞控制算法的正确性和有效性。     

俯仰/偏航式半捷联导引头光学平台稳定控制技术

针对战术导弹导引头对光轴稳定与目标快速跟踪需求,研究了一种无导引头陀螺的俯仰/偏航式半捷联导引头光学平台稳定技术;该方法利用弹体惯导测量弹体三轴姿态运动,通过控制光学平台的俯仰和偏航两通道伺服系统实现对光轴的惯性空间稳定;设计中考虑到导引头视场、跟踪精度和快速性要求,以及平台框架间的角度耦合、力矩耦合和电机非理想性等约束,通过设计解耦指令分配算法和伺服控制算法实现了对光轴的高精度稳定控制和跟踪;最后通过在Matlab/Simulink环境下的数学建模和仿真,得出无导引头陀螺的俯仰/偏航式半捷联导引头能够实现滚转通道小角度晃动导弹的导引头三轴光学平台稳定。     

飞航导弹横测通道协调变结构飞行控制系统设计

某型面对称布局飞航导弹采取BTT控制方式,可以使战术导弹在各方面获得良好的性能.但由于其横侧向通道之间具有强烈的耦合,传统的STT导弹采用的控制系统及其综合方法已经不再适用于BTT导弹,一个具有运动学耦合,惯性耦合,以及控制作用耦合的多自由度的系统综合问题被提出;应用变结构控制理论,结合经典的双回路飞行控制系统方案分别设计了偏航和滚动通道自动驾驶仪;仿真结果表明用该方法设计的飞行控制系统能够有效克服横侧向通道间的耦合以及参数摄动影响.     

高超声速飞行器模型参考变结构自动驾驶仪设计

与传统飞行器相比,高超声速的高度一体化设计造成空气动力学、推进系统和结构动态严重耦合,导致其对飞行条件的变化极其敏感,并且使得气动特性难以准确分析,这些都给其飞行控制系统设计带来了极大的挑战;文章引入了一种能够抵抗参数大范围变化的控制方法一模型参考变结构控制(MRVSC)对飞行器俯仰通道自动驾驶仪进行设计,并应用MATLAB分别对PID控制和MRVSC两种方法进行仿真分析;仿真结果表明,和经典控制方式相比,MRVSC能够更好地抵抗参数扰动影响,具有很好的控制效果.     

BTT导弹滚转通道模型参考变结构自动驾驶仪设计

BTT导弹的气动参数强烈变化特点、大机动需求和控制技术要求导弹滚转通道必须具有快的响应速度和强的抗干扰能力.针对这些特点,引入了模型参考变结构控制(MRVSC)设计导弹滚转通道自动驾驶仪,应用Simulink对PID和MRVSC两种自动驾驶仪进行仿真分析;在飞行高度为200m时,PID和MRVSC自动驾驶仪对理想弹道的跟踪效果几乎相同;在10km高度,PID方法的跟踪效果明显变差,而MRVSC具有同样的跟踪效果;仿真结果表明,MRVSC自动驾驶仪能够保证快的响应速度和抵抗参数大范围变化.     

Stabilization And Tracking Of Underactuated Surface Vessels In Random Waves With Fin Based On Adaptive Hierarchical Sliding Mode Technique

Trajectory tracking and roll stabilization are both vital practices in ship motion control. Trajectory tracking is a kind of low‐frequency control, while roll stabilization by means of fins is a kind of high‐frequency control. However, they have been studied separately previously; most tracking control of underactuated surface vessels in the previous studies do not account for roll stabilization by means of fins. In reality, however, they are an integral system. In this paper, a simple control strategy is proposed to achieve trajectory tracking and fin roll stabilization simultaneously. Four degrees of freedom derived from a six degrees of freedom mathematical model of a surface vessel is considered, including surge, sway, roll and yaw. Surge force, roll moment and yaw moment are considered as control inputs, while position, yaw angle and roll angle are controlled. The number of control inputs is fewer than the outputs to be controlled. Therefore, we are dealing with an underactuated problem. An adaptive hierarchical sliding mode control technique is employed to deal with the underactuation. Stabilization of underactuated surface vessels is studied as a special case. Random waves are applied to test the robustness of the designed controllers. Lyapunov stability theory is used to show the stability of closed‐loop system. The simulation results verify the effectiveness of the proposed strategy.     

基于小波的热连轧轧辊偏心控制

本文提出了一种用于热连轧的基于小波分析的轧辊偏心控制方法,该方法首先根据偏心信号的特点,利用小波对轧制力信号进行多分辨分解,把偏心从轧制力信号中提取出来,然后在控制中对偏心进行补偿。仿真试验表明该方法是有效的,为继续深入这方面研究与应用提供了良好的基础。     

Control of strip casting process: decentralization and optimal roll force control

In this paper, modeling and control of a twin-roll strip caster are investigated. The control objectives are to achieve a constant strip thickness and to maintain a constant roll separating force. Mathematical models are derived by analyzing five critical areas: molten steel level in the pool, solidification process, roll separating force and torque, roll gap dynamics, and roll drive dynamics. A two-level control strategy is proposed. At low level, three local controllers regulate three subsystems independently. They are a variable structure controller for the molten steel level of the pool, an adaptive predictive controller for the roll gap, which is directly related to the strip thickness, and a two-degree-of-freedom robust servo controller for the roll speed. At high level, an H₂ optimal controller governs the interaction dynamics among subsystems and generates a reference signal to the local roll speed controller in the fashion that a constant roll separating force is maintained. In designing the high level controller, the complex strip casting dynamics is linearized at an operating point and parameter estimation and uncertainty quantification methods are used. Simulation results are provided.     

Robust roll motion control of a vehicle using integrated control strategy

This paper presents an electrically actuated roll motion control of a vehicle using simulation and experimental analysis. The controller is designed with an H_∞ control scheme based on the 3 DOF vehicle model considering parameter variations, which affect the roll dynamics. To investigate the feasibility of the active roll control system, its performance is evaluated by simulation in a full vehicle model under various conditions. The Hil setup with the electrically actuated roll control system was devised and its performance was investigated through experimental works. Finally, to enhance the performance in a transient region, an integrated control strategy is presented.     

Robust adaptive backstepping sliding mode control for motion mode decoupling of two‐axle vehicles with active kinetic dynamic suspension systems

A mode decoupling control strategy is proposed for the active Kinetic Dynamic Suspension Systems (KDSS) with electrohydrostatic actuator (EHA) to improve the roll and warp mode performances. A matrix transfer method is employed to derive the modes of body and wheel station motions for full vehicle with active KDSS. The additional mode stiffness produced by the active KDSS is obtained and quantitatively described with the typical physical parameters. A new hierarchical feedback control strategy is proposed for the active KDSS to improve the roll and warp motion performances and simultaneously accounting for nonlinear dynamics of the actuators with hydraulic uncertainties. H∞ static output‐feedback control is employed to obtain the desirable mode forces, and a new projection‐based adaptive backstepping sliding mode tracking controller is designed for EHA to deal with address the nonlinearity and parameters uncertainty. This controller is used to realize the desirable pressure difference of EHA required from the target mode forces. Numerical simulations are presented to compare the roll and warp performances between the active KDSS, conventional spring‐damper suspension, and suspension with antiroll bar under typical excitation conditions. The evaluation indices are normalized and compared with radar chart. The obtained results illustrate that the proposed active KDSS with proposed controller does not produce additional warp motion for vehicle body, and has achieved more reasonable tire force distribution among wheel stations, the roll stability, road holding, and significantly improved ride comfort simultaneously.     

Hybrid attitude control in steering maneuver using ARC Hil setup

This paper presents the design of an active roll controller for a vehicle and an experimental study using an electric actuating roll control system. Firstly, based on a three degrees of freedom linear vehicle model, the controller is designed using lateral acceleration and rollrate feedback. In order to investigate the feasibility of an active control system, experimental work is carried out using a hardware-in-the-loop (Hil) setup which has been constructed using the devised electric actuating system and the full vehicle model including tire characteristics. The performance is evaluated by an experiment using the Hil setup in which steering maneuvers are carried out. Finally, in order to enhance the control performance in a transient region, the hybrid control strategy is proposed and evaluated.     

Effective Turning Motion Control of Internally Actuated Autonomous Underwater Vehicles

This paper presents a novel roll mechanism and an efficient control strategy for internally actuated autonomous underwater vehicles (AUVs). The developed control algorithms are tested on Michigan Tech’s custom research glider, ROUGHIE (Research Oriented Underwater Glider for Hands-on Investigative Engineering), in a controlled environment. The ROUGHIE’s design parameters and operational constraints were driven by its requirement to be man portable, expandable, and maneuverable in shallow water. As an underwater glider, the ROUGHIE is underactuated with direct control of only depth, pitch, and roll. A switching control method is implemented on the ROUGHIE to improve its maneuverability, enabling smooth transitions between different motion patterns. This approach uses multiple feedforward-feedback controllers. Different aspects of the roll mechanism and the effectiveness of the controller on turning motion are discussed based on experimental results. The results illustrate that the ROUGHIE is capable of achieving tight turns with a radius of 2.4 meters in less than 3 meters of water, or one order of magnitude improvement on existing internally actuated platforms. The developed roll mechanism is not specific to underwater gliders and is applicable to all AUVs, especially at lower speeds and in shallower water when external rudder is less effective in maneuvering the vehicle.     

Robust attitude tracking control of small-scale unmanned helicopter

Robust attitude control problem for small-scale unmanned helicopters is investigated to improve attitude control performances of roll and pitch channels under both small and large amplitude manoeuvre flight conditions. The model of the roll or pitch angular dynamics is regarded as a nominal single-input single-output linear system with equivalent disturbances which contain nonlinear uncertainties, coupling-effects, parameter perturbations, and external disturbances. Based on the signal compensation method, a robust controller is designed with two parts: a proportional-derivative controller and a robust compensator. The designed controller is linear and time-invariant, so it can be easily realised. The robust properties of the closed-loop system are proven. According to the ADS-33E-PRF military rotorcraft standard, the controller can achieve top control performances. Experimental results demonstrate the effectiveness of the proposed control strategy.     

基于混合控制的冷轧带钢厚控系统仿真

带钢轧制是一个复杂的非线性过程，轧辊偏心是高精度冷轧机厚度控制不能忽视的问题。当带钢原料性质、处理量变化等也会导致过程模型发生变化。该文提出一种基于重复控制进行偏心补偿、鲁棒PID控制器对模型不确定性不敏感的带钢厚度控制系统。重复控制是基于内模原理的一种新型控制策略，优点是对周期信号的初始状态没有要求，对轧辊偏心扰动有很强的抑制力；鲁棒PID采用基于最小-最大原理的参数整定方法，对于过程模型在一定变化范围内，控制器具有良好的控制性能。仿真结果证明：系统具有良好的跟随和抗扰性能，表明这种混合控制方法有一定的适用性。     

大型辊弯成型连轧机组计算机控制系统

介绍了大型辊弯成型连轧机组计算机控制系统,阐述了SIEMENSS7－300可编程控制器和欧陆SSD590全数字直流传动系统在该系统中的应用,并说明了采用微张力控制方案后系统的运行情况和控制效果。