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经典最小方差控制不能用于u(t)最高次幂u(t)p的系数多项式Bp(q-1)是不稳定的Hammerstein系统。基于经典二次型指标的控制加权一步最优控制亦难以推广到H系统。本文指出了文[3, 4]在研究此问题时的错误,提出采用对u(t)p加权的新性能指标,由此导出一种简单的直接自适应控制算法,证明了算法的局部收敛性。该算法可用于Bi(q-1), j=1, …, p稳定和非稳定的H系统的自适应控制。仿真结果证实了算法的优良性。 相似文献
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本文针对一类SISO不确定非线性大系统,提出了一种混杂间接和直接自适应分散模糊H∞控制器.通过组合模糊系统和H∞跟踪技术开发的分散自适应模糊控制算法避免了控制设计中含有的符号函数.两种自适应模糊控制器的组合消除了它们各自均不能够同时融合被控对象知识与控制知识的局限.闭环大系统被证明是稳定的,且具有H∞跟踪性能.该算法应用于自动化公路系统中车辆的纵向跟随控制,仿真结果表明混杂自适应模糊H∞控制系统的跟踪性能更好而相应的控制幅值却更小. 相似文献
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《计算机测量与控制》2014,(3):720-722
针对非线性不确定机械手系统的轨迹跟踪控制问题,提出一种具有H∞性能的神经自适应控制算法;该算法为机械手系统分别设计了主控制器和监督控制器;主控制器由神经网络控制为基础,基于滑模控制原理得到神经网络权值的自适应律;基于李亚普诺夫稳定性理论和鲁棒控制设计的监督控制器,补偿自适应神经网络对系统不确定项学习的误差,同时使系统具有H∞性能;通过二自由度机械手模型进行仿真实验,仿真结果验证了方法的有效性。 相似文献
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混沌同步问题的研究是混沌控制中的一个热点问题.文中利用自适应 H∞同步控制方法和非线性自适应同步方法,为参数相同的陈氏混沌系统设计了自适应同步控制器.根据Lyapunov稳定性原理,从理论上讨论并证明了陈氏混沌系统H∞自适应同步控制器和非线性自适应同步控制器的存在条件,并根据其存在条件进一步得到了陈氏混沌系统H∞自适应同步控制器和非线性自适应同步控制器的的构造方法,通过仿真数值计算的结果表明了这两种方法的有效性. 相似文献
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针对多输入多输出非线性多时滞系统,提出了一种直接自适应模糊跟踪控制方案.该方案有机综合了自适应控制和H∞ 控制,构建了一种自适应时滞模糊逻辑系统用来逼近有多重时滞的未知函数;设计了H∞ 补偿器来抵消模糊逼近误差和外部扰动.根据跟踪误差给出了参数调节规律,构造了包含时滞的李亚普诺夫函数,从而证明了误差闭环系统满足期望的H∞ 跟踪性能.仿真结果表明了该方案的可行性. 相似文献
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本文针对一类同时具有参数不确定性和外部扰动的非线性系统,讨论了其自适应鲁棒H∞输出反馈控制问题。提出的设计方法结合自适应控制和鲁棒H∞控制,基于Hamilton-Jacobi不等式得到了控制问题可解的充分条件和动态输出反馈控制器的形式。 相似文献
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针对多输入多输出多重时延非线性系统,提出了一种自适应模糊跟踪控制方案.该方案有机综合了自适应控制和H∞控制.文中构建了一种自适应时延模糊逻辑系统用来逼近有多重时延的未知函数;设计了H∞补偿器来抵消模糊逼近误差和外部扰动.根据跟踪误差给出了参数调节规律.构造了包含时延的李雅普诺夫函数,从而证明了误差闭环系统满足期望的H∞跟踪性能.仿真结果表明了该方案的可行性. 相似文献
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针对多输入多输出多重时延非线性系统,提出了一种自适应模糊跟踪控制方案.该方案有机综合了自适应控制和H∞控制.文中构建了一种自适应时延模糊逻辑系统用来逼近有多重时延的未知函数;设计了H∞补偿器来抵消模糊逼近误差和外部扰动.根据跟踪误差给出了参数调节规律.构造了包含时延的李雅普诺夫函数,从而证明了误差闭环系统满足期望的H∞跟踪性能.仿真结果表明了该方案的可行性. 相似文献
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智能厂房温湿度控制系统 总被引:4,自引:0,他引:4
首先分析了厂房温湿度控制与一般建筑物空调系统的区别,指出现在流行的空调控制方法不适合厂房温湿度控制;接着提出一种智能温度控制方法,它不需要确定系统的数学模型,用专控制的方法,在不同控制阶段分别采用开关控制,模糊控制和智能PID控制;最后介绍了实行结果。 相似文献
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模型跟踪广义预测鲁棒自适应控制器 总被引:4,自引:1,他引:4
本文采用滤波CARMA模型,基于内模原理,提出了一种新的广义预测鲁棒自适应控制器,并分析了闭环系统性能,在新的控制器中,引入适当的前馈作用,使得跟踪和调节问题解耦,利用部分状态跟踪、模型参考以及极点配置方法解决跟踪问题,利用多步预测滚动优化方法解决调节问题;适当选择滤波器可以保证对平稳随机扰动有满意的响应,减少可调参数对闭环系统响应的影响,增强系统对未建模动态的鲁棒性,仿真结果表明:该控制器对确定性和非平稳随机扰动具有不变性,对系统时延和阶次变化具有鲁棒性,适用于非最小相位和开环不稳定系统。 相似文献
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This article presents a novel three-loop control system, which supplements control structures known from the literature as model following control (MFC). The major advantage of the proposed system is its high robustness to process parameter variations; it is much higher than that offered by single-loop or two-loop control systems. Features of the new structure are revealed by a theoretical analysis that has been carried out from the viewpoint of requirements for a force/pose controller of a Stäubli RX60 manipulator. This article shows how the proposed control structure responds to such strong process parameter variations and makes a comparison to results yielded by single-loop control structures. 相似文献
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An approach to the synthesis of control laws stabilizing motion and force in contact tasks, based on the exponential stability of the closed-loop control system, is described. When using the synthesized control laws, simultaneous stabilization of both motion and force is achieved with a preset quality of the transient responses. The task is solved in a most general form, taking into account the constraints on robot control, its position and the force of interaction of the robot and the environment, and the external perturbations and inaccuracies of the measuring sensors, when the environment dynamics is being described by nonlinear second-order differential equation, and the robot dynamics includes the third-order equations of the robot actuators dynamics. 相似文献
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一种专家智能控制器的仿真研究 总被引:1,自引:0,他引:1
该文提出一种专家智能控制器(简称为EI控制器).该控制器的参数可基于专家知识和过程参数的变化实时进行调整。仿真结果表明对于工业过程中的大纯滞后、非线性、变参数特性能获得较为满意的调节效果。 相似文献
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Juan Garrido Francisco Vázquez Fernando Morilla 《International journal of systems science》2016,47(5):1054-1072
This paper presents a new methodology to design multivariable proportional-integral-derivative (PID) controllers based on decoupling control. The method is presented for general n × n processes. In the design procedure, an ideal decoupling control with integral action is designed to minimise interactions. It depends on the desired open-loop processes that are specified according to realisability conditions and desired closed-loop performance specifications. These realisability conditions are stated and three common cases to define the open-loop processes are studied and proposed. Then, controller elements are approximated to PID structure. From a practical point of view, the wind-up problem is also considered and a new anti-wind-up scheme for multivariable PID controller is proposed. Comparisons with other works demonstrate the effectiveness of the methodology through the use of several simulation examples and an experimental lab process. 相似文献
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Jorge Diaz-Salgado Jesus Alvarez Alexander SchaumJaime A. Moreno 《Journal of Process Control》2012,22(1):303-320
The robust feedforward (FF) output-feedback (OF) control problem of (possibly open-loop unstable) continuous exothermic jacketed reactors with isotonic kinetics with respect to reactant concentration is considered. The volume, temperature, and concentration must be regulated by manipulating the feed, exit and coolant flowrates on the basis of volume and temperature measurements. The problem is addressed as an interlaced controller-observer design within a constructive control framework. The result is a quasi linear-decentralized (qLD) FF-OF dynamic controller which: (i) recovers (up to observer convergence) the behavior of a robust nonlinear FF-SF controller, (ii) has closed-loop stability conditions coupled with conventional-like tuning guidelines, and (iii) constitutes an add-on to the PI control scheme commonly employed in industrial reactors. The approach is tested with an open-loop unstable reactor example through simulations. 相似文献