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Delay-dependent decentralized H_∞ filtering for uncertain interconnected systems

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Journal of Systems Engineering and Electronics 2008年第4期19卷 766-774页

作者： chen ning gui weihua Zhang Xiaofeng School of Information Science and Engineering Central South Univ. Changsha 410083 P. R. China

This article considers delay dependent decentralized H∞ filtering for a class of uncertain interconnected systems, where the uncertainties are assumed to be time varying and satisfy the norm-bounded conditions. First, combining the Lyapunov-Krasovskii functional approach and the delay integral inequality of matrices, a sufficient condition of the existence of the robust decentralized H∞ filter is derived, which makes the error systems asymptotically stable and satisfies the H∞ norm of the transfer function from noise input to error output less than the specified up-bound on the basis of the form of uncertainties. Then, the above sufficient condition is transformed to a system of easily solvable LMIs via a series of equivalent transformation. Finally, the numerical simulation shows the efficiency of the main results.

关键词： interconnected systems H∞ filtering delay-dependent LMI.

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基于混沌离散序列的图像加密算法研究

上海交通大学学报 2017年第10期51卷 1273-1280页

作者：陈宁贺小滨桂卫华阳春华中南大学信息科学与工程学院长沙410083

针对传统加密算法密钥空间小、加密结构简单等不足,提出了一种能极大扩充加密密钥的双重图像加密算法.在发送端,通过连续混沌系统产生图像位置映射矩阵对图像像素位置进行置乱,再通过将图像像素值信息加入离散混沌系统进行扰乱.加密的... 详细信息

针对传统加密算法密钥空间小、加密结构简单等不足,提出了一种能极大扩充加密密钥的双重图像加密算法.在发送端,通过连续混沌系统产生图像位置映射矩阵对图像像素位置进行置乱,再通过将图像像素值信息加入离散混沌系统进行扰乱.加密的图像通过以太网进行传输,并在接收端进行像素值同步解密和位置复原.该方法同时利用混沌系统的初值敏感性和混沌系统的同步性对图像进行双重加密.构造的双重混沌图像加密系统结构复杂不易破解且具有极大的密钥空间.实验表明,基于Liu混沌系统与离散混沌同步系统的双重图像加密能够抵挡图像统计攻击与无穷举攻击,并能够在Windows系统上进行实现.

关键词：图像混沌加密连续混沌系统离散混沌系统

Robust Decentralized H∞ Control for Multi-Channel Continuous-Time Systems with Time-Delays

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Robust Decentralized H∞ Control for Multi-Channel Continuou...

Robust Decentralized Generalized H2 Control of Multi-Channel Uncertain Descriptor Systems with Time-Delays

第二十七届中国控制会议

作者： chen ning,gui weihua School of Information Science and Engineering,Central South University,Changsha 410083,P.R.China

This paper considers a robust decentralized H control problem for multi-channel continuous-time *** uncertainties are assumed to be time-invariant,norm-bounded,and exist in the system,delay and control input *** interest is focused on dynamic output feedback.A sufficient condition for an uncertain multi-channel continuous-time delay system to be robustly stabilizable with H norm is derived in terms of a nonlinear matrix inequality(NMI) .A two-stage homotopy method is employed to solve the NMI ***,a decentralized controller for the nominal continuous-time delay system is computed by imposing block-diagonal constraints on the coefficient matrices of the controller ***,the decentralized controller is modified,again gradually,to cope with the *** each stage,groups of variables are fixed alternately at the iterations to reduce the NMI to linear matrix inequalities(LMIs) .An example is given to show the usefulness of this method.

关键词： Multi-Channel systems Decentralized H∞ control Time delays Homotopy method

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Robust Decentralized Generalized H2 Control of Multi-Channel...

Asynchronous Fuzzy Cognitive Networks Modeling and Control for Goethite Iron Precipitation Process

第二十七届中国控制会议

作者： chen ning,gui weihua School of Information Science and Engineering,Central South University,Changsha 410083,P.R.China

This paper considers a decentralized generalized H2 control problem for uncertain multi-channel descriptor systems with *** uncertainties are assumed to be time-invariant,norm-bounded,and exist in the system,time-delay and output *** interest is focused on dynamic output feedback.A sufficient condition for the uncertain multi-channel time-delay system to be admissible with a specified disturbance attenuation level is derived based on the theorem of Lyapunov stability *** setting the Lyapunov matrix as block diagonal appropriately according to the desired order of the con-troller,the problem is reduced to linear matrix inequalities which are sufficient to the existence condition but much more *** example is given to show the efficiency of this method.

关键词： Multi-Channel descriptor systems Decentralized H2 control Time delays

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Journal of Systems Science & Complexity 2020年第5期33卷 1422-1445页

作者： chen ning PENG Junjie gui weihua ZHOU Jiaqi DAI Jiayang School of Automation Central South UniversityChangsha 410083China School of ElectricalEngineering Guangxi UniversityNanning 530004China

Goethite iron precipitation process is a key step in direct leaching process of zinc,whose aim is to remove ferrous ions from zinc sulphate *** process consists of several cascade reactors,and each of them contains complex chemical reactions featured by strong nonlinearity and large time ***,it is hard to build up an accurate mathematical model to describe the dynamic changes in the *** this paper,by studying the mechanism of these reactions and combining historical data and expert experience,the modeling method called asynchronous fuzzy cognitive networks(AFCN)is proposed to solve the various time delay ***,the corresponding AFCN model for goethite iron precipitation process is *** control the process according to fuzzy rules,the nonlinear Hebbian learning algorithm(NHL)terminal constraints is firstly adopted for weights *** the model parameters of equilibrium intervals corresponding to different operating conditions can be ***,the matrix meeting the expected value and the weight value of steady states is stored into fuzzy rules as prior *** simulation shows that the AFCN model for goethite iron precipitation process could precisely describe the dynamic changes in the system,and verifies the superiority of control method based on fuzzy rules.

关键词： Asynchronous fuzzy cognitive networks fuzzy rules database Goethite iron precipitation process Hebbian learning

Quantizer design for interconnected feedback control systems

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控制理论与应用（英文版） 2010年第1期8卷 93-98页

作者： guisheng ZHAI ning chen weihua gui Department of Mechanical Engineering Osaka Prefecture University Sakai Osaka 599-8531 Japan School of Information Science & Engineering Central South University Changsha Hunan 410083 China

In this paper, we consider the design of interconnected H-infinity feedback control systems with quantized signals. We assume that a decentralized static output feedback has been designed for an interconnected continuous-time LTI system so that the closed-loop system is stable and a desired H-infinity disturbance attenuation level is achieved, and that the subsystems＇ measurement outputs are quantized before they are passed to the local controller. We propose a local-output-dependent strategy for updating the quantizers＇ parameters, so that the overall closed-loop system is asymptotically stable and achieves the same H-infinity disturbance attenuation level. Both the pre-designed controllers and the quantizers＇ parameters are constructed in a decentralized manner, depending on local information.

关键词： Interconnected continuous-time LTI system Decentralized H-infinity control Quantizer Quantization Matrix inequality Static output feedback

A hybrid prediction model with a selectively updating strategy for iron removal process in zinc hydrometallurgy

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Science China(Information Sciences) 2020年第1期63卷 250-252页

作者： ning chen Jiayang DAI weihua gui Yuqian GUO Jiaqi ZHOU School of Information Science and Engineering Central South University

Dear editor,In the zinc hydrometallurgy process, iron removal using goethite is an important step [1]. The goethite process involves several reactors that are arranged from high to low. A zinc sulfate solution, which is rich in ferrous ions, overflows from the first reactor and flows into the next one. Oxygen and zinc oxide are added to each reactor, respectively, to remove ferrous ions into goethite.

关键词： A hybrid prediction model with a selectively updating strategy for iron removal process in zinc hydrometallurgy LSSVR

DECENTRALIZED H_∞ SUBOPTIMAL DESIGN:AN LMI APPROACH

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Journal of Central South University 1999年第1期11卷 64-67页

作者： weihua gui Yongfang Xie ning chen Min Wu 1. College of Information Engineering Central South University of Technology 410083 Changsha China

Address the design of state feedback H ∞ suboptimal controllers. Through parameterization of decentralized controllers, the design condition for the feedback gain is given in the form of a biaffine matrix inequality. An iterative algorithm based on linear matrix inequality(LMI) is proposed to obtain the decentralized controller which ensures the closed loop system asymptotically stable and the H ∞ norm less than constant number 1.

关键词： decentralized robust control state feedback linear matrix inequalities iterative algorithm

Fault-tolerant decentralized H-infinity control for multi-channel systems using homotopy method

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控制理论与应用（英文版） 2007年第1期5卷 77-82页

作者： ning chen weihua gui Masao IKEDA School of Information Science ＆ Engineering Central South University Changsha Hunan 410083 China Graduate School of Engineering Osaka University Suita Osaka 565-0871 Japan

This paper considers a fault-tolerant decentralized H-infinity control problem for multi-channel linear time-invariant systems. The purpose is to design a decentralized H-infinity output feedback controller *** the given system and achieve a certain H-infinity performance requirement both in the normal situation and in the situation where any one of the local controllers fails. The designed problem is reduced to a feasibility problem of a set of bilinear matrix inequalities （BMIs）. An algorithm is proposed to solve the BMIs. First, the normal situation is considered where all the local controllers are functioning. The local controllers are obtained from a standard centralized H-infinity controller by using a homotopy method imposing a structural constraint progressively. Secondly, the above case is extended to the one where any one of the local controllers fails. We again use a homotopy method where the coefficient matrices of the failed controller are decreased progressively to zero. The efficiency of the proposed algorithm is demonstrated by an example.

关键词： Decentralized control H-infinity control Fault-tolerant Control BMI Homotopy method