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A New CMOS Current controlled Quadrature Oscillator Based on a MCCII

Circuits and systems 2011年第4期2卷 269-273页

作者： Ashwek Ben Saied Samir Ben Salem Dorra Sellami Masmoudi Computor Imaging and Electronic Systems Group (CIEL) Research Unit on Intelligent Design and Control of complex Systems (ICOS) University of Sfax National Engineering School of Sfax (ENIS) Development Group in Electronics and Communications (EleCom)

In this paper, we propose a design of a current controlled Quadrature Sinusoidal Oscillator. The proposed circuit employs three optimized Multi-output translinear second generation current conveyer (MCCII). The oscillation condition and the oscillation frequency are independently controllable. The proposed Quadrature Oscillator frequency can be tuned in the range of [198 MHz –261 MHz] by a simple variation of a DC current. PSpice simulation results are performed using CMOS 0.35 μm process of AMS.

关键词： Quadrature Sinusoidal Oscillator Optimized MCCII

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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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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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Leader-follower based formation control of nonholonomic robots using the virtual vehicle approach

Leader-follower based formation control of nonholonomic robo...

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International Conference on Mechatronics (ICM)

作者： Jawhar Ghommam Hasan Mehrjerdi Maarouf Saad Research Unit on Intelligent Control and Optimization of Complex Systems National School of Engineer of Sfax ENIS Tunisia Department of Electrical Engineering École de technologie supérieure Québec Canada

In this paper we investigate the leader follower motion coordination of multiple nonholonomic mobile robots. A combination of the virtual vehicle and trajectory tracking approach is used to derive the formation architecture. A virtual vehicle is steered in such away it stabilizes to a shifted reference position/heading deflned by the leader, the velocity of the virtual vehicle is then provided for further use in designing control law for the follower independent from the measurement of leader's velocity. Position tracking control is then constructed for the follower to track the virtual vehicle using the backstepping and Lyapunov direct design technique. Simulations are provided to show the effectiveness of the proposed approach.

关键词： Lead Vehicles Robot kinematics

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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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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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Robust adaptive path following for a nonlinear third order Nomoto's ship model

Robust adaptive path following for a nonlinear third order N...

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International Multi-Conference on systems, Signals and Devices

作者： Taktak-Meziou, M. Ghommam, J. Derbel, N. Intelligent Control Design and Optimization of Complex Systems Unit ENIS Tunisia

ISBN: (纸本)9781424475346

In this paper, an adaptive backstepping method is used for a ship course tracking control. This has been done by applying a reference signal derived from a LOS algorithm. The ship model is described by a third order nonlinear model whose parameters are unknown. The control design uses estimate values of the unknown parameters of the system. Then, adaptive laws of the estimation of these values have been proposed. The stability of the controlled system has been ensured by the use of a Lyapunov function. Simulation results show the effectiveness of the proposed approach and the designed controller can be used to the ship course tracking with good performances. ©2010 IEEE.

关键词： Lyapunov functions

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Hierarchical Fuzzy Signatures approach for a piloted quality management system

Hierarchical Fuzzy Signatures approach for a piloted quality...

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

作者： Hajer Ben Mahmoud Raouf Ketata Taieb Ben Romdhane Samir Ben Ahmed National Institute of Applied Science and Technology (INSAT) Research units on Intelligent Control design and Optimisation of Complex System ICOS Corporation Tunisia National Institute of Applied Science and Technology INSAT Tunisia Research units on Methods and tools for Complex Computer Systems MOSIC Tunisia

There are many areas where objects with very complex and sometimes interdependent features are to be classified; similarities and dissimilarities are to be evaluated. This makes a complex decision model difficult to construct effectively. This paper presents a Hierarchical Fuzzy Signatures (HFS) approach for improving the effectiveness and efficiency of quality-management system (QMS). The goal is to classify the objectives for a real-world case study. The latter was chosen because it presents a major problem for controlling the quality levels of its production lines. With the use of this fuzzy signature structure, complex decision models in the quality management field should be able to be constructed more effectively. In fact, this study provides a path for designing a tool for decision support to ensure the effectiveness of a corporate QMS.

关键词： Companies Quality management Biological system modeling Computational modeling Production Availability ISO standards

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Robust adaptive path following for a nonlinear third order Nomoto's ship model

Robust adaptive path following for a nonlinear third order N...

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

作者： M. Taktak-Meziou J. Ghommam N. Derbel Intelligent Control Design and Optimization of Complex Systems Unit ENIS Engineering School Tunisia

关键词： Marine vehicles

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