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IEEE SSD International Multi-Conference on systems, Signals and Devices

作者： Nabil Derbel Research Unit on Intelligent Control design &Optimisation of complex Systems (ICOS) National school of Engineers of Sfax (ENIS) University of Sfax Tunisia

This work is aimed at looking into the use of fuzzy systems for the study of nonlinear systems. In a first step, zero-order and first-order Sugeno fuzzy models are defined as approximators of nonlinear systems. It has been found that zero-order fuzzy systems are equivalent to the classical interpolation approach. Nonlinear terms have been limited by two fuzzy systems. The mean fuzzy system gives good accuracy. As illustrations, some numerical applications have been considered to show the efficiency of the use of fuzzy systems to study nonlinear problems.

关键词： Approximation methods Fuzzy systems Linear approximation Fuzzy control Nonlinear systems Differential equations Accuracy

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Some clustering techniques for modelling uncertain nonlinear systems

Some clustering techniques for modelling uncertain nonlinear...

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IEEE SSD International Multi-Conference on systems, Signals and Devices

作者： Ali Zribi Mohamed Djemel Mohamed Chtourou Research Unit on Intelligent Control design & Optimisation of Complex Systems (ICOS) Department of Electrical Engineering ENIS Engineering School Sfax Tunisia

This paper presents popular unsupervised clustering algorithms based on neuro-fuzzy, fuzzy c-means (FCM) and agglomerative techniques. The purpose of this paper is to provide clustering methods able to cluster the data patterns without a priori information about the number of clusters. We will show that it is possible to reconcile the FCM algorithm with the unsupervised clustering algorithms. Finally, to show the efficiencies of these algorithms, we will apply them to model the behaviour of uncertain system.

关键词： Clustering algorithms Distance measurement Classification algorithms Support vector machine classification Partitioning algorithms Algorithm design and analysis Equations

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Variable structure control for set-point stabilization OF 2-DOF underactuated manipulators

Variable structure control for set-point stabilization OF 2-...

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IEEE SSD International Multi-Conference on systems, Signals and Devices

作者： S. Mahjoub F. Mnif N. Derbel Research unit on Intelligent Control Design &Optimization of complex Systems (ICOS) École Nationale d''lngenieurs de Sfax Sfax Tunisia Department of Electrical and Computer Engineering Sultan Qaboos University Muscat Oman Res. unit on Intell. Control Ecole Nat. d'Ing. de Sfax Sfax

controlling an underactuated manipulator with less actuators than degree of freedom is a challenging problem, specifically when it is to force the underactuated manipulator to track a given trajectory or to be configurated at a specific position in the work space. This paper presents a cascade sliding mode tracking controller for set-point regulation of 2-DOF underactuated manipulators. This work builds on an observation that an underactuated manipulator can be treated as two subsystems. Consequently, a cascade sliding mode tracking controller can be designed as follows. First, a sliding mode surface is designed for both subsystems, this two sliding surfaces represent a first layer in the design architecture. A second layer sliding mode surface is then constructed based on the first layer sliding surface. The cascaded sliding mode controller is therefor deduced in terms of Lyapunov stability theorem. Robustness issues to bounded disturbances are then investigated. Simulation results on 2-DOF whiling pendulum are presented to demonstrate the effectiveness of the approach.

关键词： control systems Manipulators Lyapunov method Joints Evolution (biology) Robustness Mechanical systems

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ON THE ADAPTIVE FUZZY STABILIZATION OF UNKNOWN NONLINEAR systems

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control AND intelligent systems 2007年第4期35卷 337-350页

作者： Halima, D. B. Chtourou, M. Intelligent Control Optimization and Design of Complex Systems (ICOS) Department of Electrical Engineering National School of Engineers of Sfax ENIS P.B.W. 3038 Sfax Tunisia

In this work, we present a state feedback adaptive fuzzy control method, applied to the stabilization of a nonlinear system whose mathematical model is unknown or/and with varying time parameters. The synthesis of the control law is based on fuzzy models developed by a local description of the considered system's dynamics. Therefore, two steps, at each time, are necessary to the adaptive control of such system. The first one consists in estimating every local model parameters, using a gradient method as parameter's adjustment method. The second one consists in the computation, of the control law based on the classical methods applied for the linear system control as the state feedback control. The stability of the proposed adaptive control method is discussed.

关键词： Fuzzy dynamic system adaptive fuzzy control state feedback control gradient method stability analysis

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Investigation to the use of vibration energy for supply of hearing aids

Investigation to the use of vibration energy for supply of h...

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24th IEEE Instrumentation and Measurement Technology Conference

作者： Ben Amor, N. Kanoun, O. Sfax National School of Engineering Research Unit on Intelligent Control Design and Optimization of Complex Systems (ICOS) BPW 303B Tunisia Department of Metrology University of Kassel Germany

ISBN: (纸本)9781424405886

Using ambient energy, the operation time of batteries in mobile applications can be increased and the acceptability by the user can be improved In this paper we investigate the possibilities to design hearing aids as power aware system scavenging energy directly from its environment. The energy source we consider is vibration produced by movements primarily in the neighbourhood of the ear and other movements of the human body. Experimental measurements of vibration were evaluated by means of a theoretical model. The results show that an interesting improvement of battery operation time can be reached.

关键词： energy autonomous systems power aware systems hearing aid vibration energy

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Investigation to the Use of Vibration Energy for Supply of Hearing Aids

Investigation to the Use of Vibration Energy for Supply of H...

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IEEE Instrumentation and Measurement Technology Conference

作者： N. Ben Amor O. Kanoun Sfax National School of Engineering Research unit on Intelligent Control design& Optimization of complex Systems (ICOS) BPW Tunisia Chair of Metrology University of Kassel Germany

Using ambient energy, the operation time of batteries in mobile applications can be increased and the acceptability by the user can be improved. In this paper we investigate the possibilities to design hearing aids as power aware system scavenging energy directly from its environment. The energy source we consider is vibration produced by movements primarily in the neighbourhood of the ear and other movements of the human body. Experimental measurements of vibration were evaluated by means of a theoretical model. The results show that an interesting improvement of battery operation time can be reached.

关键词： Hearing aids Auditory system Batteries Testing Humans Vibration measurement Power supplies Energy consumption Costs Detectors

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Nonlinear Formation control of a Group of Underactuated Ships

Nonlinear Formation Control of a Group of Underactuated Ship...

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OCEANS - Europe

作者： J. Ghommem F. Mnif G. Poisson N. Derbel Research unit on Intelligent Control design & Optimization of complex Systems (ICOS) Ecole Nationale d''Ingenieurs de Sfax Sfax Tunisia Laboratoire de Vision et de Robotique Bourges France

ISBN: (纸本)9781424406340

This paper addresses a nonlinear formation control of a group of underactuated ship at a dynamic level of planar formation control, while holding a desired inter-ship formation pattern. In particular we propose a combination of the virtual structure and the path following approaches to derive the formation architecture. Ship coordination is achieved by adjusting the speed of each of the ships along its path, in the sense that the derivative of the path is left as a free input to synchronize the ships motion. The proposed controller is basically based on Lyapunov direct method and backstepping technique. Simulations illustrate the efficacy of the proposed approach.

关键词： Marine vehicles Robot kinematics Feedback Nonlinear control systems control systems Vehicle dynamics Remotely operated vehicles Space vehicles Communication system control Backstepping

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MARKOV DECISION PROCESSES WITH UNCERTAIN TRANSITION RATES: SENSITIVITY AND MAX HYPHEN MIN control

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Asian Journal of control 2008年第2期6卷

作者： Suresh Kalyanasundaram Edwin K. P. Chong Ness B. Shroff Motorola India Electronics Limited No. 66/1 Plot 5 Bagmane Techpark C. V. Raman Nagar Post Bangalore 560 093 India. Department of Electrical and Computer Engineering Colorado State University Fort Collins CO 80523-1373 USA. Professor Edwin K. P. Chong received the B.E.(Hons.) degree with First Class Honors from the University of Adelaide South Australia in 1987 graduating top of his class and the M.A. and Ph.D. degrees in 1989 and 1991 respectively both from Princeton University where he held an IBM Fellowship. He joined the School of Electrical and Computer Engineering at Purdue University in 1991 where he was named a University Faculty Scholar in 1999 and promoted to Full Professor in 2001. Since August 2001 he has been a Professor of Electrical and Computer Engineering and Professor of Mathematics at Colorado State University. His current interests are in communication networks and optimization methods. He coauthored the best-selling book An Introduction to Optimization 2nd Edition Wiley-Interscience 2001. He received the NSF CAREER Award in 1995 and the ASEE Frederick Emmons Terman Award in 1998. He coauthored a paper that was awarded Best Paper in the journal Computer Networks 2003. Professor Chong is a Fellow of the IEEE. He was founding chairman of the IEEE Control Systems Society Technical Committee on Discrete Event Systems and until recently served as an IEEE Control Systems Society Distinguished Lecturer. He has been on the editorial board of the IEEE Transactions on Automatic Control. He is currently on the editorial board of the journal Computer Networks. He has also served on the organizing committees of several international conferences. He has been on the program committees for the IEEE Conference on Decision and Control the American Control Conference the IEEE International Symposium on Intelligent Control IEEE Symposium on Computers and Communications and the IEEE Global Telecommunications Conference. He has also served in the executive committees for the IEEE Co

Solution techniques for Markov decision problems rely on exact knowledge of the transition rates, which may be difficult or impossible to obtain. In this paper, we consider Markov decision problems with uncertain transition rates represented as compact sets. We first consider the problem of sensitivity analysis where the aim is to quantify the range of uncertainty of the average per-unit-time reward given the range of uncertainty of the transition rates. We then develop solution techniques for the problem of obtaining the max-min optimal policy, which maximizes the worst-case average per-unit-time reward. In each of these problems, we distinguish between systems that can have their transition rates chosen independently and those where the transition rates depend on each other. Our solution techniques are applicable to Markov decision processes with fixed but unknown transition rates and to those with time-varying transition rates.

关键词： Markov decision processes sensitivity max-min control call admission control policy iteration

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SYNCHRONIZATION OF GENERALIZED LORENZ SYSTEM USING ADAPTIVE controlLER

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IFAC Proceedings Volumes 2006年第8期39卷 2-6页

作者： Moez Feki Research unit on Intelligent Control design & Optimization of complex Systems (ICOS) Ecole Nationale d'Ingénieurs de Sfax BP W 3038Sfax Tunisia

This paper proposes a synchronization scheme for a class of continuous-time chaotic systems. We show that two systems belonging to the class of generalized Lorenz systems can be synchronized using an adaptive feedback controller. This controller is added to the response system to force a subset of its state variables to oscillate synchronously with their counterpart of the drive system. We show that the controller gain vector is tuned without any knowledge of the system model. To illustrate the efficiency of the proposed scheme, we present numerical simulations to synchronize two-by-two a Lorenz-like system, Chen system and Lü system.

关键词： Chaotic systems Chaotic synchronization Adaptive control Output regulation Lyapunov stability

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An optimized low voltage and High Frequency CCII based multifunction Filters

An optimized low voltage and High Frequency CCII based multi...

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ICECS 2006 - 13th IEEE International Conference on Electronics, Circuits and systems

作者： Salem, Samir Ben Masmoudi, Dorra Sellami Said, Ashwek Ben Loulou, Mourad Laboratoire de l'Electronique et des Technologies de l'Information National Engineering School of Sfax Tunisia Research Unit on Intelligent Design and Control of Complex Systems National Engineering School of Sfax Tunisia

ISBN: (纸本)1424403952

In this paper, a low voltage current conveyor (CCII) based multifunction filter is presented. Firstly, thanks to an optimizing heuristic, an optimal sizing of a low voltage low power CMOS current conveyor (CCII) was done. Hence, we improve static and dynamic performances of this configuration. The optimized CCII configuration has a current bandwidth of 1.103GHz and a voltage bandwidth of 1.18GHz and 33.4 Ω as RX parasitic resistance value. Secondly, implementation of a multifunction filter based on this configuration was done. The current mode filter has a tunable central frequency in the range [50MHz-800MHz]. PSPICE simulations are presented to demonstrate these results. ©2006 IEEE.

关键词： Bandwidth

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