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On the trajectory tracking and coordination of multi-robot systems with communication delay

On the trajectory tracking and coordination of multi-robot s...

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

作者： Yassine Bouteraa Gerard Poisson Jawhar Ghommam Nabil Derbel Institut PRISME Équipe de recherche: Systèmes Robotiques Interactifs Université d''Oran-Es-senia France Engineering School of Sfax (ENIS) Research unit on Intelligent Control design and Optimization of complex Systems (ICOS) University of Sfax Tunisia

We develop new control approach to position synchronization of lagrangian systems based on emergent consenus algorithms. The proposed control approach works to accomplish multi-robot systems synchronization. The control strategy is to synchronize the angular position and the velocity of each robot in the group. The cooperative strategy only requires local neighbor-to-neighbor information exchange between systems and does not assume the existence of an explicit leader in the team. A combination of the lyapunov-based techniques and graph theory have been used to establish the multi-robot system asymptotic stability. The developed control combines trajectory tracking and coordination algorithms. To address the time delays problem in the cooperative network communication, the suggested synchronization control law is shown to synchronize multiple robots as well as to track given trajectory, taking into account the presence of the time delay. To this end, Krasovskii functional method has been used to deal with the delay-dependent stability problem.

关键词： Robot kinematics Synchronization Delay effects Manipulators Trajectory Tracking

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intelligent model of continuous improvement mechanisms scope of QMS

Intelligent model of continuous improvement mechanisms scope...

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IEEE International Conference on systems, Man and Cybernetics

作者： Sofiene Hermi Taieb Ben Romdhane Raouf Ketata Department of Physics and Instrumentation Engineering National Institute of Applied Science and Technology Tunis Tunisia Research Unit on Intelligent Control Design and Optimization of Complex System (ICOS) National Engineering School of Sfax Sfax Tunisia

This work proposes a new methodology to evaluate and improve the QMS (Quality Management System) effectiveness and efficiency to succeed for a factual approach including all monitoring parameters. This idea is justified by the difficulties incurred by the organizations to establish a continuous improvement's system based on the objectives and the process approach. In addition, the guidelines defined by the FDX 50-174 part published by AFNOR to assess the QMS effectiveness, still guides defining the assessment criteria and progress levels. Indeed, to facilitate the continuous improvement system's integration, we propose a new methodology based on a broad range of monitoring tools (functional and operational indicators, audits, quality control, customer satisfaction) and including the requirements of the process and the system approach.

关键词： Continuous improvement design engineering Quality management Condition monitoring Customer satisfaction ISO standards Physics Instruments Management training Cybernetics

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Parameters effect on basic DC to DC converter structures

Parameters effect on basic DC to DC converter structures

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

作者： N. Ben Amor O. Kanoun N. Derbel Measurement and Sensor Technology University of Chemnitz Germany Research Unit of Intelligent Control design & Optimisation of complex Systems (ICOS) BPW Sfax National Engineering School Tunisia

ISBN: (纸本)9781457704130

Progress in low power Very Large Scale Integration (VLSI) design open up possibilities of powering wireless devises from scavenged ambient energy. An energy management system should be designed to manage the harvested energy. DC to DC converters represent the key element in energy management systems. Knowing the diversity of DC-DC converters generally designed for specific applications, basic converters are under scope in this paper. Operation principles and simulation patterns of basic DC to DC converters are first presented. Parameter simulation occurring the effect of duty cycle, inductance, capacity and switch polarisation is studied in depth. The gaol of this paper is to show main parameters effect on output voltage behaviour. Simulation results show that the main parameters in DC-DC converters design play a key role to avoid extra-lose of harvested energy.

关键词： Energy harvesting Energy management DC-DC converter

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Multiple model reduction based control approach for non linear systems

Multiple model reduction based control approach for non line...

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

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

ISBN: (纸本)9781457704130

For linear plants, IMC have been shown good robustness properties against disturbances and model mismatches. However, when uncertain processes are concerned, the original IMC structure cannot be directly used for control system implementation. In this paper, an internal multiple model control (IMMC) based on linear model's library is introduced. This approach supposes the definition of a set of local models developed within each cluster. Such decomposition is obtained using the fuzzy c-means (FCM) clustering algorithm. Then the gap metric concept has been designed as a criterion to analyze the relationships among candidate models to get a reduced model bank.

关键词： Measurement Mathematical model Computational modeling Analytical models Adaptation model Clustering algorithms Data models

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Aerial sequence registration for vehicle detection

Aerial sequence registration for vehicle detection

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

作者： Ines Hadj Mtir Khaled Kaâniche Mohamed Chtourou Pascal Vasseur Intelligent Control design and Optimization of complex Systems ENIS University of Sfax Sfax Tunisia Laboratoire dInformatique du Traitement de lInformation et des Systèmes LITIS Université de Rouen Rouen France

ISBN: (纸本)9781467315906

In this paper we present a system that aims at detecting and tracking moving objects from aerial video streams. These sequences are obtained from a camera mounted on an aerial vehicle which flies over roads and highways. In order to compensate the motion introduced by the dynamic behavior of the camera, we have to estimate geometrical transformations which stabilize consecutive frames. Our system is based on the use of Mutual Information as a criterion to find an affine model which relates a frame to a reference one. Then, moving regions are extracted using residual motion. The tracking module takes as input these regions to eliminate false alarms and to track vehicles all over the time.

关键词： Vehicles Joints Histograms Roads Streaming media Mutual information Feature extraction

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Wavelet autoregressive forecasting of climatic parameters for photovoltaic systems

Wavelet autoregressive forecasting of climatic parameters fo...

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

作者： Chokri Ben Salah Anouar Ben Mabrouk Mohamed Ouali Research Unit on Intelligent Control Optimization design & optimization of complex Systems (ICOS) Department of Electrical Engineering National School of Engineers of Sfax Sfax Tunisia Department of Computer Sciences Higher Institute for Applied Sciences and Technology HIAST Sousse Tunisia Department of Electrical Engineering National School of Engineers of Sfax Sfax Tunisia

ISBN: (纸本)9781457704130

In this paper wavelet decomposition is combined with autoregressive models to analyze and predict climate time series such as solar radiation and photovoltaic cell temperature. The method is tested on climate parameters for analysis, and solar radiation and cell temperature for prediction. The work effectiveness is evaluated by the prediction of the electric energy produced by a 100 Wp photovoltaic panel. Finally, the performance of predictor is measured by standardized error.

关键词： Mathematical model Temperature measurement Time series analysis Predictive models Solar radiation Wavelet analysis Photovoltaic systems

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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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Path tracking design by input/output Davidson-Cole transfer function

Path tracking design by input/output Davidson-Cole transfer ...

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

作者： Najah Yousfi Pierre Melchior Chokri Rekik Nabil Derbel Alain Oustaloup Research unit on Intelligent Control design & Optimization of complex Systems (ICOS) Sfax Engineering School BPW University of Sfax Sfax Tunisia Département LAPS 351 cours de la Liberation IMS CNRS UMR 5218 Université Bordeaux 1 Talence France

ISBN: (纸本)9781457704130

Autonomous vehicle navigation requires the integration of many technologies such as path tracking. In path tracking design, we must take into account the dynamic of actuators in order to reduce overshoots appearing for small displacements. It permits the generation of an optimal movement reference-input giving a minimum path completion time, taking into consideration the maximum velocity, acceleration and jerk, and the bandwidth of the closed-loop on which the input is applied. Different methods were studied. The work presented here focuses on the fractional differentiation prefilter applied to nonvarying plants. A new approach to path tracking using fractional differentiation by direct optimization of an I/O transfer function was developed. Fractional differentiation is used here through a Davidson-Cole filter (DC) whose main property is having no overshoot on the plant output, whatever the values of its constitutive parameters. A simulation on a motor model validates the methodology.

关键词： Transfer functions Acceleration Bandwidth optimization Resonant frequency DC motors Tracking

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Face recognition under varying facial expression based on Perceived Facial Images and local feature matching

Face recognition under varying facial expression based on Pe...

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International Conference on Information Technology and e-Services (ICITeS)

作者： Hayet Boughrara Liming Chen Chokri Ben Amar Mohamed Chtourou Research unit on Intelligent Control design and Optimization of complex Systems (ICOS) Sfax Engineering School University of Sfax Tunisia Laboratoire d'InfoRmatique en Image et Systèmes d'information (LIRIS) CNRS Ecole Centrale Lyon (ECL) Université de Lyon France

Face recognition is becoming a difficult process because of the generally similar shapes of faces and because of the numerous variations between images of the same face. A face recognition system aims at recognizing a face in a manner that is as independent as possible of these image variations. Such variations make face recognition, on the basis of appearance, a difficult task. This paper attempts to overcome the variations of facial expression and proposes a biological vision-based facial description, namely Perceived Facial Images (PFIs), applied to facial images for 2D face recognition. Based on the intermediate facial description, SIFT-based feature matching is then carried out to calculate similarity measures between a given probe face and the gallery ones. Because the proposed biological vision-based facial description generates a PFI for each quantized gradient orientation of facial images, we further propose a weighted sum rule based fusion scheme. The proposed approach was tested on three facial expression databases: the Cohn and Kanade Facial Expression Database, the Japanese Female Facial Expression (JAFFE) Database and the FEEDTUM Database. The experimental results demonstrate the effectiveness of the proposed method.

关键词： Databases Face recognition Face Vectors Neurons Feature extraction Probes

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Crane control by flatness

Crane control by flatness

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

作者： Haifa Souilem Hassen Mekki Nabil Derbel Research unit on Intelligent Control design and Optimisation of complex Systems (ICOS) National School of Engineers of Sfax Sfax Tunisia National School of Engineers of Sousse National School of Engineers of Sfax Sfax Tunisia

This work is aimed at looking into the flatness control of the crane detailing adopted mechanisms and approaches in order to be able to control this system and to solve problems encountered during its functioning. The control objective is the sway free transportation of the crane s load taking the commands of the crane operator into account. Based on the mathematical model linearizing and stabilizing control laws for the slewing and luffing motion are derived using the input/output linearization approach. The method allows for transportation of the payload to a selected point and ensures minimisation of its swings when the motion is finished. To achieve this goal a mathematical model of the control system of the displacement of the payload has been constructed. A theory of control which ensures swing free stop of the payload is presented. Selected results of numerical simulations are shown. At the end of this work, a comparative study between the real moving and the desired one has been presented.

关键词： Cranes Trajectory Payloads Mathematical model Load modeling Pulleys

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