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19th IFAC World Congress on International Federation of automatic control, IFAC 2014

作者： Gassara, Hamdi El Hajjaji, Ahmed Chaabane, Mohamed Modeling Information and Systems Laboratory University of Picardie Jules Verne Amiens80000 France Laboratory of Sciences and Techniques of Automatic Control and Computer Engineering Lab-STA National School of Engineering of Sfax University of Sfax Tunisia

ISBN: (纸本)9783902823625

This paper investigates the problem of stabilization of time delay linear singular systems subject to actuator saturation. A polytopic approach is used to describe the saturation behavior. By using an augmented Lyaponuv-Krasovskii functional and adopting the delay partitioning technique, less conservative sufficient conditions are established to ensure the closed loop system to be locally admissible based on a state feedback controller. In this paper, all the conditions are transformed into minimization problem involving LMI conditions by adopting the idea of the cone complementarity algorithm. A numerical example illustrates the effectiveness of the design. © IFAC.

关键词： Time delay

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Parametric estimation for wiener-hammerstein models by the recursive instrumental variable method

Parametric estimation for wiener-hammerstein models by the r...

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International Conference on sciences and techniques of automatic control and computer engineering (STA)

作者： Marai Ghanmi Afef Salhi Houda Hajji Sofien Kamoun Samira Laboratory of Sciences and Techniques of Automatic Control and computer engineering (Lab-STA)

ISBN: (纸本)9781509034086

This document aims to solve the parametric estimation problem of nonlinear time-varying systems modeled by Wiener-Hammerstein models (W-H) with unknown time-varying parameters. A recursive instrumental variable estimation method is developed in order to estimate the parameters of the considered blocks-oriented models despite the existence of a correlated noise with observations. The estimation method is based on the least square technique. Furthermore, an example is devoted to appear and justify the availability of the detailed and proposed method.

关键词： Mathematical model Estimation Instruments Nonlinear systems Computational modeling Prediction algorithms Predictive models

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Higher Order Sliding Mode control of Uncertain Robot Manipulators

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Journal of Electrical engineering 2014年第3期2卷 116-123页

作者： Neila Mezghani Ben Romdhane Tarak Damak Lab-STA (Laboratory of Sciences and Techniques of Automatic Control and Computer Engineering) National Engineering School ofSfax Sfax 3038 Tunisia

This paper proposes a higher order sliding mode controller for uncertain robot manipulators. The motivation for using high order sliding mode mainly relies on its appreciable features, such as high precision and elimination of chattering in addition to assure the same performance of conventional sliding mode like robustness. Instead of a regular control input, the derivative of the control input is used in the proposed control law. The discontinuity in the controller is made to act on the time derivative of the control input. The actual control signal obtained by integrating the derivative control signal is smooth and chattering free. The stability and the robustness of the proposed controller can be easily verified by using the classical Lyapunov criterion. The proposed controller is tested to a three-degree-of-freedom robot to prove its effectiveness.

关键词： High order sliding mode control of robot Lyapunov method

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Structural estimation of Wiener-Hammerstein mathematical models

Structural estimation of Wiener-Hammerstein mathematical mod...

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International Conference on Systems and control (ICSC)

作者： Afef Ghanmi Samira Kamoun Sofien Hajji Laboratory of Sciences and Techniques of Automatic Control and computer engineering (Lab-STA) Tunis University Tunis Tunisia Laboratory of Sciences and Techniques of Automatic Control and computer engineering (Lab-STA) University of Sfax Sfax BP Tunisia

In nonlinear system identification, block-oriented models such as Wiener and Hammerstein models have the advantage that they are quite simple to understand and easy to use. This paper presents a structural estimation of the Wiener-Hammerstein model, which is a block-oriented model where a static nonlinear system is surrounded by two linear dynamics at its input and output. The first part concerns the estimation of the order that is made by the ratio method of determining (DR). The second part describes the problem of estimating the delay. In this sense, estimation method is proposed namely estimation algorithm RLSVT. The analytical results are validated by numerical simulation examples.

关键词： Mathematical model Delays Estimation Polynomials Nonlinear dynamical systems Numerical models

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A novel maximum power point tracking algorithm for photovoltaic systems

A novel maximum power point tracking algorithm for photovolt...

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International Conference on sciences and techniques of automatic control and computer engineering (STA)

作者： Asma Zaidi Karim Dahech Tarek Damak Laboratory of Sciences and Techniques of Automatic Control and Computer Engineering (Lab-STA) University of Sfax Sfax Tunisia

ISBN: (纸本)9781509034086

A maximum power point tracking method based on fast terminal sliding mode control (FTSMC) for photovoltaic systems is introduced in this work. The control scheme contains two loops: the first achieves the maximum power point (MPP) searching via an incremental conductance algorithm which provides the reference voltage (MPV). The second loop performs the regulation of the operating point to the reference MPV. Simulations results have proved the efficiency of the proposed method.

关键词： Mathematical model Maximum power point trackers Photovoltaic systems Temperature Sliding mode control Algorithm design and analysis

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Robust self-tuning regulation for the stochastic systems described by ARARMAX mathematical models

Robust self-tuning regulation for the stochastic systems des...

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International Conference on sciences and techniques of automatic control and computer engineering (STA)

作者： Nabiha Touijer Samira Kamoun Laboratory of Sciences and Techniques of Automatic control and computer engineering (Lab-STA) University of Sfax Sfax Tunisia

This communication deals with the explicit scheme of robust self-tuning regulation of a class of stochastic systems, which can be described by the input-output Auto-Regressive Auto-Regressive Moving Average with exogenous (ARARMAX) mathematical model with unknown and time-varying parameters in presence of unmodelled dynamics. This explicit regulation scheme is based on the proposed modified filtering recursive least squares algorithm with dead zone (m-F-RLS) in the step of estimation. Numerical simulation results of the developed explicit schemes of minimum variance self-tuning regulator, which are applied to the climate control in building, are given.

关键词： Estimation Mathematical model Heuristic algorithms Stochastic systems Robustness computers Noise

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Robust control of wheeled mobile robot in presence of disturbances and uncertainties

Robust control of wheeled mobile robot in presence of distur...

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International Conference on sciences and techniques of automatic control and computer engineering (STA)

作者： Yasmine Koubaa Mohamed Boukattaya Tarak Damak University of Sfax Laboratory of Sciences and Techniques of Automatic control & computer engineering (Lab-STA) Sfax Tunisia

This paper deals with the trajectory tracking control problem of nonholonomic wheeled mobile robot, in the presence of external disturbances and parameters uncertainties. The computed torque controller may be used to make convergence of WMR on desired trajectory. Due to the weak of performance against external disturbances, a sliding mode controller is presented. The stability of the controllers is proven by utilizing the Lyapunov stability theory.

关键词： Mobile robots Wheels Kinematics Uncertainty Vectors Equations Torque

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Sliding mode multiple observer for perturbed output nonlinear systems

Sliding mode multiple observer for perturbed output nonlinea...

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International Conference on sciences and techniques of automatic control and computer engineering (STA)

作者： Kaïs Hfaiedh Karim Dahech Yosra Massaoudi Tarak Damak Laboratory of Sciences and Techniques of Automatic control and computer engineering (Lab-STA) University of Sfax Sfax Tunisia

ISBN: (纸本)9781467392358

This paper deals with the problem of state estimation for perturbed output nonlinear systems. A multiple models approach is used to describe such class of systems. Then a structure of Lyapunov based sliding mode multiple observer is presented. The stability proof of the observer is ensured by a suitable choice of estimation gains which are solutions of a set Linear Matrix Inequalities(LMI). The simulation results for the denitrification application demonstrate the effectiveness of the developed estimator scheme.

关键词： Observers Nonlinear systems Robustness Stability analysis Asymptotic stability computers

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Comparison of adaptive input-output linearization & fuzzy sliding-mode control for induction motor

Comparison of adaptive input-output linearization & fuzzy sl...

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International Conference on sciences and techniques of automatic control and computer engineering (STA)

作者： Saïd Boubzizi Hafedh Abid Maher Kharrat Ahmed El Hajjaji Mohamed Chaabane Laboratory of Sciences and Techniques of Automatic & Computer Engineering University of Sfax Tunisia

ISBN: (纸本)9781467392358

This paper presents a comparison between adaptive input-output linearization and adaptive fuzzy sliding mode control (FSMC) for induction motor. At first, we describe the adaptive linearization control method, which consists in the cancelling of the nonlinearities and decoupling between speed and flux of the system when Rr and TL are unknowns constants. The adaptive sliding mode control, which is insensitive to parameter variations and external disturbances. The substituting of discontinuous control by fuzzy system can be solution for the chattering problem and minimize the control effort.

关键词： Induction motors Sliding mode control Adaptation models Fuzzy systems Mathematical model Rotors

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On the Stabilization of a Class of OSL Conformable Fractional Order Nonlinear Systems 11

On the Stabilization of a Class of OSL Conformable Fractiona...

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11th IEEE International Conference on Systems and control, ICSC 2023

作者： Alsharif, Ali Omar M. Jmal, A. Naifar, O. Ahmed, Ausama H. Gassara, Hamdi Makhlouf, A. Ben Electrical Engineering Department BP 1173 Sfax3038 Tunisia Elmergib University Faculty of Engineering Department of Electrical & Computer Engineering Alkhums Libya National School of Engineering of Sfax University of Sfax Laboratory of Sciences and Techniques of Automatic Control and Computer Engineering Tunisia Faculty of Sciences of Sfax Department of Mathematics Route Soukra BP 1171 Sfax3000 Tunisia

ISBN: (纸本)9798350304886

One-Sided Lipschitz (OSL) fractional order modeling is a top choice for solving the stabilization issue of nonlinear systems. Despite numerous studies on the subject, there remains a gap in understanding when it comes to fractional calculus. By providing a stabilizing strategy for a certain type of OSL fractional order nonlinear systems, this study fills the gap. A numerical example demonstrating the correctness of the suggested approach and demonstrating its efficacy for the tested class. © 2023 IEEE.

关键词： Stabilization

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