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Delay-dependent Stabilization Conditions of Controlled Positive Continuous-time Systems

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International Journal of Automation and computing 2014年第6期11卷 653-660页

作者： Wafa Elloumi Abdellah Benzaouia mohamed chaabane Lab-STA National School of Engineering of Sfax University of Sfax PB 1173 3038 Sfax Tunisia LAEPT URAC 28 University Cadi Ayyad Faculty of Science Semlalia BP 2390 Marrakech Morocco

The stabilization problem for a class of linear continuous-time systems with time-varying non differentiable delay is solved while imposing positivity in closed-loop. In particular, the synthesis of state-feedback controllers is studied by giving sufficient conditions in terms of linear matrix inequalities(LMIs). The obtained results are then extended to systems with non positive delay matrix by applying a memory controller. The effectiveness of the proposed method is shown by using numerical examples.

关键词： Positive systems delay systems stabilization linear matrix inequalities (LMIs) time-varying delay non differentiable delay

Absolute Stability of Nonlinear Systems with Two Additive Time-varying Delay Components

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International Journal of Automation and computing 2011年第4期8卷 391-402页

作者： Bassem Ben Hamed mohamed chaabane Walid Kacem Higher Institute of Applied Sciences and Technology of Gab`es Department of Mathematics Street Amor Ben El Khatab 6029 Gab`es Tunisia National Engineering School of Sfax Department of Electrical Engineering Street Soukra km 3.5 B.P. 1173 3038 Sfax Tunisia

In this paper, we present a new sufficient condition for absolute stability of Lure system with two additive time-varying delay components. This criterion is expressed as a set of linear matrix inequalities （LMIs）, which can be readily tested by using standard numerical software. We use this new criterion to stabilize a class of nonlinear time-delay systems. Some numerical examples are given to illustrate the applicability of the results using standard numerical software.

关键词： Time-varying delay system additive delay absolute stability linear matrix inequalities (LMIs) S-procedure Lyapunov Krasovskii functional stabilization.

Sensor Faults Observer Design with H_∞ Performance for Non-linear T-S systems

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International Journal of Automation and computing 2013年第6期10卷 563-570页

作者： Imen Haj Brahim Maha Bouattour Driss Mehdi mohamed chaabane Ghani Hashim Laboratory of Sciences and Techniques of Automatic Control&Computer Engineering(Lab-STA) National School of Engineering of SfaxUniversity of Sfax LIAS-ENSIP University of PoitiersLIAS-ENSIP2 rue Pierre Brousse Computer Science Department Cihan University

This paper deals with the problem of the state estimation and the sensor faults detection for nonlinear perturbed systems described by Takagi-Sugeno （T-S） fuzzy models with unmeasurable premise variables. Indeed, a T-S observer is synthesized, in descriptor form, to estimate both the system states and the sensor faults simultaneously. The idea of the proposed approach is to introduce the sensor fault as an auxiliary variable in the state vector. Besides, the T-S model with unmeasurable premise variables is reduced to a perturbed model with measurable variables. Convergence conditions are established with Lyapunov theory and the H∞ performance in order to guarantee the best robustness to disturbances. These conditions are expressed in terms of linear matrix inequalities （LMIs）. The parameters of the observer are computed using the solution of the LMI conditions. Finally, a numerical example is given to illustrate the design procedures. Simulation results show the satisfactory performances.

关键词： Takagi-Sugeno (T-S) fuzzy system sensor faults H∞ performance descriptor approach observer linear matrix inequality(LMI).

Comparative study of three types of controllers for DFIG in wind energy conversion system

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Protection and Control of Modern Power Systems 2018年第1期3卷 223-234页

作者： Saïd Boubzizi Hafedh Abid Ahmed El hajjaji mohamed chaabane Lab-STA Laboratory National Engineering School of SfaxRoute de la Soukra3029 SfaxTunisia MIS Laboratory University of Picardie Jules Verne33Rue Saint-Leu80039 AmiensFrance

This paper presents an enhanced control strategy for Wind Energy Conversion System(WECS)using Doubly-Fed Induction Generator(DFIG).A robust Super-Twisting(STW)sliding mode control for variable speed wind turbine is developed to produce the optimal aerodynamic torque and improve the dynamic performance of the *** electromagnetic torque of the DFIG is directly tracked using the proposed control to achieve maximum power *** performance and the effectiveness of the STW control strategy are compared to conventional Sliding Mode(SM)and Proportional-Integral(PI)*** proposed STW algorithm shows interesting features in terms of chattering reduction,finite convergence time and robustness against parameters variations and system disturbances.

关键词： Wind turbine(WT) Doubly-fed induction generator(DFIG) Power generation STW(super-twisting) Second order sliding mode control(SOSMC) PI controller

Sliding Mode Control, with Integrator, for a Class of Mimo Nonlinear Systems

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Engineering（科研） 2011年第5期3卷 435-444页

作者： Anouar Benamor Larbi Chrifi-alaui Hassani Messaoud mohamed chaabane 不详

In this paper, the robust control problem of general nonlinear multi-input multi-output (MIMO) systems is proposed. The robustness against unknown disturbances is considered. Two algorithms based on the Sliding Mode Control (SMC) for nonlinear coupled multi-input multi-output (MIMO) systems are proposed: the first order sliding mode control (FOSMC) with saturation (sat) function and the FOSMC with sat combined with integrator controller. Those algorithms were simulated and implemented on the three tanks test-bed system and the exprimental results confirm the effectiveness of our control design.

关键词： Sliding Mode Control Integrator Nonlinear Systems Coupled Mimo Uncertain Liquid Level Control

Topological Modeling of a One Stage Spur Gear Transmission

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Chinese Journal of Mechanical Engineering 2014年第5期27卷 900-908页

作者： MILADI chaabane Mariem PLATEAUX Régis CHOLEY Jean-Yves KARRA Chafik RIVIERE Alain HADDAR mohamed Mechanical Modeling and Manufacturing Unit National Engineering School of Sfax(ENIS) BP 1173 – 3038 – Sfax – Tunisia Laboratory of Engineering of the Mechanical Structures and Materials High Institute of Mechanic of Paris(SUPMECA)3 rue Fernand HainautNational 93407 Saint-Ouen Cedex Mechanical Modeling and Manufacturing Unit National Engineering School of Sfax(ENIS) BP 1173–3038–Sfax–Tunisia

Finding a basis of unification for the modeling of mechatronic systems is the search subject of several *** paper is a part of a general research designed to the application of topology as a new approach for the modeling of mechatronic ***,the modeling of a one stage spur gear transmission using a topological approach is *** approach is based on the concepts of topological collections and transformations and implemented using the MGS（modeling of general systems）*** topological collections are used to specify the interconnection laws of the one stage spur gear transmission and the transformations are used to specify the local behavior laws of its different *** order to validate this approach,simulation results are presented and compared with those obtained with MODELICA language using Dymola *** good results are achieved,this approach might be used as a basis of unification for the modeling of mechatronic systems.

关键词： topological modeling topological collections transformations MGS language one stage spur gear