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Dynamic output feedback variable structure control for the output stabhjzation of MIMO uncertain plants with actuator and sensor hysteresis nonlinearities 4

Dynamic output feedback variable structure control for the o...

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4th IFAC symposium on Robust control design, ROCOND 2003

作者： Corradini, M.L. Parlangeli, G. Dipartimento di Ingegneria dell'Innovazione Università di Lecce strada per Montemni Lecce73100 Italy

This paper addresses the measured output zeroing problem of a square plant containing non-smooth nonlinear Sties in actuator and sensor devices. An "extended" hysteresis model has been proposed, and a robust sliding mode controller, based on the output of a reduced order observer, has been synthesized;such control law ensures both the measured output zeroing and the boundedness of the unavailable states. Theoretical results have been validated by simulation. © 2003 IFAC.

关键词： Robust control

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Anti-windup feedforward/feedback control for a class of nonlinear systems 4

Anti-windup feedforward/feedback control for a class of nonl...

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4th IFAC symposium on Robust control design, ROCOND 2003

作者： Méndez-Acosta, H.O. Femat, R. Campos-Delgado, D.U. Gonzalez-Alvarez, V. Depto. Ingenieria Quimica Universidad de Guadalajara Guadalajara-Jalisco44860 Mexico Fac. de Ciencias Universidad Autónoma de San Luis Potosí San Luis Potosi-S.L.P.78290 Mexico Depto. Matemáticas Aplicadas y Sistemas Computacionales IPICyT Apdo. Postal 3-90 San Luis Potosi-S.L.P78231 Mexico

In this paper an anti-windup scheme is proposed for two robust feedforward/feedback control laws: one linear and the other nonlinear. Since the control laws present an observer-based structure, the anti-windup scheme results in a natural manner by taking into account the actuator constraints. It is shown that the anti-windup scheme improves the performance of the control laws. The resulting strategies are implemented in an anaerobic digester for wastewater treatment. Performance is illustrated by numerical simulations. © 2003 IF AC.

关键词： Wastewater treatment

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A robust asymptotic observer for chemical and biochemical reactors 4

A robust asymptotic observer for chemical and biochemical re...

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4th IFAC symposium on Robust control design, ROCOND 2003

作者： González, A.-V. And, Harm J. Dochain, D. Rapaport, A. Steyer, J.P. Pelayo Ortiz, C. Alvarez, G.-V. INRA-LBE Avenue des Etangs Narbonne11100 France INRA-LASB 2 Place Viala Montpellier34060 France CESAME Universite Catholtque de Louvain 4-6 avenue Georges Lemaitre Louvain la NeuveB-I348 Belgium Universidad de Guadalajara CUCEI Calz. Gral M. Garcia Barragan 1451 Guadalajara Mexico

A simple state observer is proposed for a class of lumped nonlinear time-varying systems useful in chemical and biochemical engineering. It is shown that this asymptotic nonlinear observer is stable in the presence of time-varying elements and robust in the face of initial conditions uncertainty and a total lack of knowledge on the nonlinearities of the system. Experimental results are presented using a model of an anaerobic digestion process for the treatment of industrial wastewater from a wine distillery and tested using real data obtained from a 1 m3 continuous fixed bed pilot bioreactor. © 2003 IF AC.

关键词： Distilleries

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Robust H/sub /spl infin// state observer design for a class of nonlinear systems via switching

Robust H/sub /spl infin// state observer design for a class ...

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IEEE International symposium on Intelligent control (ISIC)

作者： Hong Nie Jun Zhao Yueming Hu School of Information Science and Engineering Northeastern University Shenyang China College of Automation Science and Engineering South China University of Technology Guangzhou China

A robust H/sub /spl infin// hybrid state observer design method for a class of nonlinear systems is put forward. Suppose that there exist finite candidate observers in a given set of observers, and none of the individual observers is robust H/sub /spl infin// observer which makes the error system of nonlinear system stabilizable with H/sub /spl infin// disturbance attenuation. The problem is to design a switching law under which the switched observation process remains robustly stable and the specified upper bound constraint of the L/sub 2/ gain from exogenous disturbances to error state outputs is simultaneously guaranteed. Based on single Lyapunov function technique and multiple Lyapunov function technique, respectively, two sufficient conditions for the switched nonlinear error systems to be stabilizable with H/sub /spl infin// disturbance attenuation are derived and the gain matrices of observers are designed. All results are given by linear matrix inequalities (LMIs). Finally, a simulation example illustrates the main results of this paper.

关键词： Robustness nonlinear systems Linear matrix inequalities Attenuation design engineering Lyapunov method Uncertainty observers Riccati equations Information science

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Output derivative estimation and disturbance attenuation using PI observer with application to a class of nonlinear systems

Output derivative estimation and disturbance attenuation usi...

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Southeastern symposium on System Theory

作者： B. Shafai H.M. Oloomi Department of Electrical and Computer Engineering Northeastern University Boston MA USA Department of Electrical Engineering Purdue University at Fort Wayne Fort Wayne IN USA

High-gain observers have been used to estimate derivatives of the output in different applications. These observers have shown great advantages in the design of nonlinear output feedback control of nonlinear systems. However, when disturbances and/or noises are present in the systems, the performance of high-gain observers is degraded. We try to overcome this deficiency by investigating the applicability of proportional integral (PI) observers. A PI observer has successfully been used in LTR design and it has shown the ability of simultaneous estimation of states and disturbances. This paper proposes a new output derivative estimation using a PI observer for certain classes of nonlinear systems. Simulation results demonstrate the robustness of PI observers.

关键词： Attenuation nonlinear systems observers Application software nonlinear control systems Output feedback control systems Noise robustness Degradation State estimation

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Fault detection and isolation based on Takagi-Sugeno modelling

Fault detection and isolation based on Takagi-Sugeno modelli...

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IEEE International symposium on Intelligent control (ISIC)

作者： E. Alcorta-Garcia S. Saucedo-Flores Facultad de Ingeniería Mecánica y Eléctrica Universidad Autónoma de Nuevo León Mexico Escuela Superior de Ingeniería Mec. y Eléc Institute Politecnico Nacional Mexico

One of the difficulties to detect and isolate faults in nonlinear systems via observer-based methods is the design of a residual generator. In this work a procedure to approach the fault detection and isolation problem in nonlinear systems is proposed. The result is obtained by deriving several subsystems, each subsystem containing information about specific faults, from the plant under consideration. Takagi-Sugeno modelling is used to design fuzzy observers and generate residuals. The detection and isolation task is solved by evaluating these residuals. The advantage of the proposed approach is that the design condition for the observers is relaxed. Furthermore the potential use of decoupling techniques is reinforced. The design methodology is shown using a laboratory three tank system.

关键词： Fault detection Takagi-Sugeno model nonlinear systems design methodology Intelligent control Laboratories Sensor systems Actuators Power generation economics Fault diagnosis

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observer-based strict positive real (SPR) feedback control system design

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AUTOMATICA 2002年第9期38卷 1557-1564页

作者： Johansson, R Robertson, A Lund Univ Lund Inst Technol Dept Automat Control SE-22100 Lund Sweden

This paper presents theory for stability analysis and design for a class of observer-based feedback control systems. Relaxation of the controllability and observability conditions imposed in the Yakubovich-Kalman-Popov (YKP) lemma can be made for a class of nonlinear systems described by a linear time-invariant system (LTI) with a feedback-connected cone-bounded nonlinear element. It is shown how a circle-criterion approach can be used to design an observer-based state feedback control which yields a closed-loop system with specified robustness characteristics. The approach is relevant for design with preservation of stability when a cone-bounded nonlinearity is introduced in the feedback loop. Important applications are to be found in nonlinear control with high robustness requirements. (C) 2002 Elsevier Science Ltd. All rights reserved.

关键词： observers stability strict positive realness (SPR) robustness

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design of a nonlinear distributed parameter observer for a pressure swing adsorption plant

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JOURNAL OF PROCESS control 2002年第4期12卷 533-543页

作者： Bitzer, M Zeitz, M Univ Stuttgart Inst Syst Dunam & Regelungstech D-70550 Stuttgart Germany

As an integral part of an advanced process monitoring and control scheme, the reconstruction of the spatial concentration, temperature, and pressure profiles of an oxygen production plant is studied by the design of a nonlinear observer with distributed parameters. The considered pressure swing adsorption process consists of two adsorbers and each adsorber of two layers. The design of the nonlinear observer with distributed parameters is illustrated for a single adsorption layer, which is described by six quasilinear partial differential equations and related boundary conditions. Thereby, a late lumping approach is used in order to design the injected correction functions in the observer equations and to introduce tuning parameters with a physical meaning. The observer is extended to the entire adsorption process and its simulation shows an excellent convergence behavior. (C) 2002 Elsevier Science Ltd. All rights reserved.

关键词： distributed parameter systems late lumping observer designs adsorption process wave propagation phenomena sensor location process monitoring and control

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design of a nonlinear distributed parameter observer for a pressure swing adsorption plant

Design of a nonlinear distributed parameter observer for a p...

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International symposium on Advanced control of Chemical Processes

作者： Bitzer, M Zeitz, M Univ Stuttgart Inst Syst Dunam & Regelungstech D-70550 Stuttgart Germany

关键词： distributed parameter systems late lumping observer designs adsorption process wave propagation phenomena sensor location process monitoring and control

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Speed Sensorless Field Oriented control of an Induction Motor at zero speed with identification of inverter model parameters

Speed Sensorless Field Oriented Control of an Induction Moto...

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IEEE International symposium on Industrial Electronics

作者： Rasmussen, H Vadstrup, P Borsting, H Univ Aalborg DK-9220 Aalborg Denmark

ISBN: (纸本)0780373693

Using adaptive Lyapunov design a new approach for the design of an observer for speed sensorless control is developed. The resulting scheme leads to a nonlinear full order observer for the motor states and for the motor and inverter parameters including the rotor speed. Assuming motor parameters known the design achieves stability with guaranteed region of attraction. Experiments demonstrate high dynamic performance even at zero rotor speed based only on the slip frequency caused by the load torque.

关键词： Induction motors

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