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A new stability analysis and controller design method for discrete-time linear systems with saturation nonlinearities

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控制理论与应用（英文版） 2011年第4期9卷 604-610页

作者： Wei GUAN guanghong yang School of Automation Shenyang Aerospace UniversityShenyang Liaoning 1 10136China CollegeofInformationScienceandEngineering NortheasternUniversityShenyangLiaoning110004China

The problems of stability analysis and controllers design for discrete-time linear systems subject to state saturation nonlinearities are investigated in this paper. Both full state saturation and partial state saturation are considered. It is well known to all that the controller design problem under state saturation is very difficult and complex to deal with. In order to overcome the difficulty, a new and tractable system is constructed, and it can be proved that the constructed system is with the same domain of attraction as the original system. With the aid of this property, to estimate the domain of attraction of the original system, an LMI-based method is presented for estimating the domain of attraction of the origin for the new constructed system under state saturation. Further, two optimization algorithms are developed for constructing dynamic output-feedback controllers and state feedback controllers, respectively, which guarantee that the domain of attraction of the origin for the closed-loop system is as ＇large＇ as possible. An example is provided to demonstrate the effectiveness of the new method.

关键词： State saturation Linear systems LMIs

Backstepping adaptive fuzzy control of uncertain nonlinear systems against actuator faults

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控制理论与应用（英文版） 2009年第3期7卷 248-256页

作者： Ping LI guanghong yang Key Laboratory of Integrated Automation for the Process Industry Ministry of Educationand College of Information Science and Engineering Northeastern University Shenyang Liaoning 110004 China

A class of unknown nonlinear systems subject to uncertain actuator faults and external disturbances will be studied in this paper with the help of fuzzy approximation theory. Using backstepping technique, a novel adaptive fuzzy control approach is proposed to accommodate the uncertain actuator faults during operation and deal with the external disturbances though the systems cannot be linearized by feedback. The considered faults are modeled as both loss of effectiveness and lock-in-place （stuck at some unknown place）. It is proved that the proposed control scheme can guarantee all signals of the closed-loop system to be semi-globally uniformly ultimately bounded and the tracking error between the system output and the reference signal converge to a small neighborhood of zero, though the nonlinear functions of the controlled system as well as the actuator faults and the external disturbances are all unknown. Simulation results demonstrate the effectiveness of the control approach.

关键词： Adaptive control Fuzzy system Backstepping Uncertain nonlinear system Actuator fault

H-infinity performance optimization for networked control systems with limited communication channels

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控制理论与应用（英文版） 2010年第1期8卷 99-104页

作者： Yulong WANG guanghong yang School of Electronics and Information Jiangsu University of Science and Technology Zhenjiang Jiangsu 212003 China College of Information Science and Engineering Northeastern University Shenyang Liaoning 110004 China

This paper studies the problems of H-infinity performance optimization and controller design for continuous-time NCSs with both sensor-to-controller and controller-to-actuator communication constraints （limited communication channels）. By taking the derivative character of network-induced delay into full consideration and defining new Lyapunov functions, linear matrix inequalities （LMIs）-based H-infinity performance optimization and controller design are presented for NCSs with limited communication channels. If there do not exist any constraints on the communication channels, the proposed design methods are also applicable. The merit of the proposed methods lies in their Jess conservativeness, which is achieved by avoiding the utilization of bounding inequalities for cross products of vectors. The simulation results illustrate the merit and effectiveness of the proposed H-infinity controller design for NCSs with limited communication channels.

关键词： Networked control systems (NCSs) Limited communication channels Performance optimization Controller design

An adaptive fuzzy design for fault-tolerant control of MIMO nonlinear uncertain systems

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控制理论与应用（英文版） 2011年第2期9卷 244-250页

作者： Li, Ping yang, guanghong College of Information Science and Engineering Huaqiao University Xiamen Fujian 361021 China College of Information Science and Engineering Northeastern University Shenyang Liaoning 110004 China

This paper presents a novel control method for accommodating actuator faults in a class of multiple-input multiple-output (MIMO) nonlinear uncertain *** designed control scheme can tolerate both the time-varying lock-in-place and loss of effectiveness actuator *** each subsystem of the considered MIMO system,the controller is obtained from a backstepping procedure;an adaptive fuzzy approximator with minimal learning parameterization is employed to approximate the package of unknown nonlinear functions in each design *** control effort is taken to deal with the approximation error and external disturbance *** is proven that the closed-loop stability and desired tracking performance can be guaranteed by the proposed control *** example is used to show the effectiveness of the designed controller.

关键词： Fault-tolerant control MIMO nonlinear system Adaptive fuzzy control Backstepping

Non-fragile state feedback H-infinity control for discrete-time systems with quantized signals

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控制理论与应用（英文版） 2009年第1期7卷 63-67页

作者： Weiwei CHE guanghong yang Key Laboratory of Integrated Automation for the Process Industry Ministry of Education College of Information Science and Engineering Northeastern University Shenyang Liaoning 110004 China

This paper presents a study on the problem of non-fragile state feedback H-infinity controller design for linear discrete-time systems with quantized signals. The quantizers considered here are dynamic and time-varying. With the consideration of controller gain variations and quantized signals at the same time, a new non-fragile H-infinity control strategy is proposed with updating quantizer＇s parameters, such that the quantized closed-loop system is asymptotically stable and with a prescribed H-infinity performance bound. An example is presented to illustrate the effectiveness of the proposed control strategy.

关键词： Linear systems Non-fragile Dynamic quantizer H-infinity control LMI

Observer-based H-infinity control in multiple channel networked control systems with random packet dropouts

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控制理论与应用（英文版） 2010年第3期8卷 359-367页

作者： Weiwei CHE Jianliang WANG guanghong yang School of Electrical and Electronic Engineering Nanyang Technological University Singapore 639798 School of Information Science and Engineering Northeastern University Shenyang Liaoning 110004 China

This paper investigates the observer-based H-infinity control problem for networked control systems （NCSs） with random packet dropouts. A general packet dropout model with multiple independent stochastic variables in the multiple channels case is adopted to describe the data missing in the limited communication channels. With the consideration of the sensor-to-controller and controller-to-actuator packet dropouts at the same time, a new method is pro- posed based on a separation lemma to design an observer-based H-infinity controller, which exponentially stabilizes the closed-loop system in the sense of mean square and also achieves a prescribed H-infinity disturbance attenuation level. A numerical example is given to illustrate the effectiveness of the proposed control method.

关键词： Networked control system (NCS) H-infinity control Separation lemma Random packet dropouts LMI

H-infinity filtering for discrete-time switched linear systems under arbitrary switching

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控制理论与应用（英文版） 2011年第2期9卷 261-266页

作者： Ding, Dawei yang, guanghong Li, Xiaoli University of Science and Technology Beijing Beijing 100083 China College of Information Science and Engineering And State Key Laboratory of Integrated Automation for Process Industry Northeastern University Shenyang 110004 China

This paper is concerned with the problem of H-infinity filtering for discrete-time switched linear systems under arbitrary switching *** sufficient conditions for the solvability of the problem are given via switched quadratic Lyapunov *** on Finsler's lemma,two sets of slack variables with special structure are introduced to provide extra degrees of freedom in optimizing the guaranteed H-infinity *** to the existing methods,the proposed one has better performances and less *** example is given to illustrate its effectiveness.

关键词： Switched systems Switched quadratic Lyapunov function Finsler's lemma Filtering Linear matrix inequality (LMI)

Robust fault-tolerant controller design for linear time-invariant systems with actuator failures:an indirect adaptive method

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控制理论与应用（英文版） 2010年第4期8卷 471-478页

作者： Xiaozheng JIN guanghong yang Yanping LI Key Laboratory of Manufacturing Industrial Integrated Automation Shenyang University Shenyang Liaoning 110044 China Key Laboratory of Integrated Automation for the Process Industry Ministry of Education and College of Information Science and Engineering Northeastern University Shenyang Liaoning 110004 China

In this paper,indirect adaptive state feedback control schemes are developed to solve the robust fault-tolerant control （FTC） design problem of actuator fault and perturbation compensations for linear time-invariant systems.A more general and practical model of actuator faults is *** both eventual faults on actuators and perturbations are unknown,the adaptive schemes are addressed to estimate the lower and upper bounds of actuator-stuck faults and perturbations online,as well as to estimate control effectiveness on ***,on the basis of the information from adaptive schemes,an adaptive robust state feed-back controller is designed to compensate the effects of faults and perturbations *** to Lyapunov stability theory,it is shown that the robust adaptive closed-loop systems can be ensured to be asymptotically stable under the influence of actuator faults and bounded *** example is provided to further illustrate the fault compensation effectiveness.

关键词： Fault-tolerant control Actuator failures Adaptive robust control Asymptotic stability

Nonlinear Fault Tolerant Control for Polynomial Systems with Input Saturation

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Nonlinear Fault Tolerant Control for Polynomial Systems with...