DIGITAL PID CONTROLLER DESIGN FOR DELAYED MULTIVARIABLE SYSTEMS

A new methodology is proposed to design digital PID controllers for multivariable systems with time delays. Except for a few parameters that are preliminarily selected, most of the PID parameters are systematically tuned using the developed plant state‐feedback and controller state‐feedforward LQR approach, such that satisfactory performance with guaranteed closed‐loop stability is achieved. In order to deal with the modeling error owing to the delay time rational approximation, an IMC structure is utilized, such that robust stability is achieved, without need for an observer, and with improved online tuning convenience. Using the prediction‐based digital redesign method, the digital implementation is obtained based on the above‐proposed analog controller, such that the resulting mixed‐signal system performance will closely match that of the analog controlled system. An illustrative example is given for comparison with alternative techniques.     

多变量非线性问题计算机图示的数学模型及其应用

本文将三维空间中非线性问题计算机图示的方法推广到多维空间中非线性问题,导出了一般多变量非线性问题计算机图示的数学模型,从而为计算机图示多变量非线性问题,获得多变量非线性问题总体的,直观的形象,以方便地把握问题总体变化趋势,提供了工具.     

一类非线性相似组合系统的鲁棒分散控制器的设计

对于一类非线性组合系统提出了系统的相似性结构的定义,讨论了这类具有相似性结构的非线性结构不确定组合系统的鲁棒分散镇定问题.利用系统的相似性结构,采用输入、输出线性化与滑模控制原理相结合的方法所设计出的鲁棒分散控制器可确保闭环系统是渐近稳定的.研究结果表明系统的相似性结构使设计的滑动面和分散控制器亦具有相似结构,从而简化了对系统的分析与设计.     

MODEL‐REFERENCE OUTPUT‐FEEDBACK SLIDING MODE CONTROLLER FOR A CLASS OF MULTIVARIABLE NONLINEAR SYSTEMS

This paper proposes an output‐feedback sliding mode control design for a class of uncertain multivariable plants with nonlinear disturbances. The approach used here is based on the control parameterization employed in model‐reference adaptive control. The disturbances are allowed to be unmatched and to depend not only on the plant output but also on its unmeas‐urable state. A less restrictive condition on the uncertainty of the high frequency gain matrix is also obtained.     

一个通用的混合非线性规划问题的演化算法

提出了一种新的求解非线性规划问题的演化算法，它是在郭涛算法的基础上提出的，新算法的主要特点是引入了变维子空间，加入了子空间搜索过程和规范化约束条件以及增加了处理带等式约束的实数规划，整数规划，0－1规划和混合整数规划问题的功能，使之成为一种求解非线性规划（NLP）问题的通用算法，数值实验表明，新算法不仅是一种通用的算法，而且与已有算法的计算结果相比，其解的精确度也最好。     

基于高次神经网络的一类非线性组合大系统的鲁棒控制器设计

对于一类非线性组合大系统,本文提出了基于 高次神经网络的一种新型控制器的设计方法．本文首先用高次神经网络逼近非线性组合大系 统中的互联项,然后基于高次神经网络设计一种新型控制器,这种设计方法不仅解决了大系 统中的最为复杂的互联项问题,较以往采用的办法在工程上易于实现．仿真结果表明了该方 法的有效性．     

STATE‐SPACE DIGITAL PID CONTROLLER DESIGN FOR MULTIVARIABLE ANALOG SYSTEMS WITH MULTIPLE TIME DELAYS

This paper presents a discrete‐time state‐space methodology for optimal design of digital PID controllers for multivariable analog systems with multiple time delays. The multiple time‐delayed multivariable analog systems are formulated in a state‐space generic form so that the exact discrete‐time state‐space model can be constructed. Then, the optimal digital PID controller is designed via a state‐feedback and state‐feedforward LQR approach. The developed PID controller can be applied to a general time‐delayed multivariable analog system represented by a semi‐proper or strictly proper transfer function matrix. Illustrative examples are given to compare the performance of the proposed approach with alternative techniques.     

一类多变量非线性动态系统的鲁棒自适应模糊控制

对一类非线性多变量未知动态系统,提出了一种自适应模糊控制策略.策略中采用IF-THEN推理规则来构造模糊逻辑系统,实现对系统中未知函数的估计,在建模误差为零的条件下设计状态反馈控制器及参数的自适应律.分析了当存在建模误差时,闭环系统的稳定性和鲁棒性.     

ABSOLUTE STABILITY AND APPLICATION TO DESIGN OF OBSERVER‐BASED CONTROLLER FOR NONLINEAR TIME‐DELAY SYSTEMS

In this paper we present a new sufficient condition for absolute stability of delay Lure system. This condition improves the one given in [1]. We use this new criterion to construct an observer‐based control for a class of nonlinear time‐delay systems. Some examples are given to illustrate the results of this paper.     

ROBUST NONLINEAR CONTROLLER DESIGN FOR A LONGITUDINAL FLIGHT CONTROL PROBLEM

In this paper, the H_∞ approximate I/O linearization formulation and μ‐synthesis are employed to design a nonlinear controller for an aircraft longitudinal flight control problem. We propose modified nonlinear H_∞ controller formulas to approximately linearize the system and use μ‐synthesis to address tracking, regulation, and robustness issues.     

一类时变非线性系统的参数反馈模糊控制器分析与设计

本文针对工业控制中一类常见的非线性时变系统，提出了一种利用参数反馈在线修正 规则的模糊控制器；在全面介绍控制器结构与功能的同时，详细阐述了模糊规则修正器的原 理和设计方法，并采用基于功能评价的方法进行系统分析．在这个控制系统中，基本模糊控 制器简单实用；模糊规则修正器能充分利用对被控对象的分析成果；GA寻优算法能进一步简 化设计，提高性能．仿真结果表明，这种控制器的效果是令人满意的．     

严格反馈随机非线性系统风险灵敏度输出反馈控制器设计

研究了一类严格反馈随机非线性系统的输出反馈设计问题.在无限时区风险灵敏度指标下,应用积分反推(integrator backstepping)技术,设计了控制器.所设计的控制器能够保障对任意风险灵敏度系数具有任意小的指标,并且闭环系统为概率意义下有界的.特别地,所设计的控制器还能保证控制器的平衡条件.仿真例子验证了理论结果的正确性.     

一般非线性系统的控制解耦

本文利用微分几何方法,讨论了一般非线性系统的反馈解耦和无交互控制问题,给出了一般非线性系统的状态方程反馈解耦及块输入-块输出无交互控制问题可解的充分必要条件.     

一类非线性时变结构系统的辨识方法和预报器

本文对一类非线性时变结构系统,给出一种新型的递推梯度法和结构适应式自校正递推预报器.这种算法能自动改变模型的结构.通过油田预报实践,表明这种预报器能跟踪系统结构性变化,从而提高变结构系统预报的精度.     

非线性扰动不确定时滞系统时滞相关鲁棒观测器设计

研究一类具有非线性扰动的不确定时滞系统的时滞相关鲁棒稳定性及其基于观测器的时滞相关鲁棒控制问题.将线性矩阵不等式(LMI,1inear matrix inequality)与数值不等式(AVI,algebraic value inequality)方法相结合给出了开环系统渐近稳定及其指数稳定的时滞相关条件.并设计了系统的观测器,给出了该系统基于观测器的时滞相关可镇定条件.     

ON SOCIAL LEARNING AND ROBUST EVOLUTIONARY ALGORITHM DESIGN IN THE COURNOT OLIGOPOLY GAME

Agent-based computational economics (ACE) combines elements from economics and computer science. In this article, the focus is on the relation between the evolutionary technique that is used and the economic problem that is modeled. In the field of ACE, economic simulations often derive parameter settings for the genetic algorithm directly from the values of the economic model parameters.
This article compares two important approaches that are dominating in ACE and shows that the above practice may hinder the performance of the genetic algorithm and thereby hinder agent learning. More specifically, it is shown that economic model parameters and evolutionary algorithm parameters should be treated separately by comparing the two widely used approaches to social learning with respect to their convergence properties and robustness. This leads to new considerations for the methodological aspects of evolutionary algorithm design within the field of ACE.     

非线性NARMAX模型结构与参数一体化辨识的改进算法

本文针对现有辨识算法所存在的缺陷,作了如 下改进工作：提出了一种新的模型选项准则（[ERR]准则）,克服了原[err]准则易导致 冗余项被错误选入的缺陷,保证了模型结构的正确辨识;对原算法做了较大改进,克服了原 算法使用时遭遇的存储困难问题,极大程度地改善了辨识算法的数值稳定性．理论分析及仿 真结果均证明了改进算法的优越性及有效性．     

A ROBUST ADAPTIVE CONTROL DESIGN FOR A CLASS OF UNCERTAIN NONLINEAR MARKOVIAN JUMP SYSTEMS

A direct robust adaptive nonlinear control scheme for a class of uncertain nonlinear Markovian jump systems with nonlinear state‐dependent uncertainty is presented. The proposed scheme is Lyapunov‐based and guarantees the global uniform ultimate boundedness of the closed‐loop system in the mean sense. A numerical example is given to demonstrate the validity of the results.     

一类不确定时滞系统的鲁棒H∞控制器设计

一类不确定时滞系统的鲁棒Ｈ∞控制器设计王景成（上海交通大学自动化系上海２０００３０）苏宏业褚健（浙江大学工业控制技术研究所杭州３１００２７）关键词线性时滞系统，鲁棒Ｈ∞控制，不确定性，静态状态反馈，二次稳定性．１）国家自然科学基金资助项目（Ｎｏ．６９...     

具有状态和控制滞后不确定系统的保性能控制器设计

1　引言本文的目的在于将文献 [1 ]的结论推广到同时具有状态和控制滞后的不确定系统 ,并进而研究其最优保性能控制问题 .考虑具有状态和控制滞后的不确定系统x( t) =[A DF( t) E1 ] x( t) [Ad DF( t) Ed] x( t-d) [B DF( t) E2 ] u( t) [Bh DF( t) Eh]《u》( t-