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485 results on '"Giri, Fouad"'

26. A Note on Sampled-Data Observers

Author

Karafyllis, Iasson, Ahmed-Ali, Tarek, and Giri, Fouad

Subjects
Mathematics - Optimization and Control, Electrical Engineering and Systems Science - Systems and Control
Abstract

We present a new approach for deriving sampled-data observers from continuous-time observers that feature an Input-to-Output Stability property with respect to the output measurement noise and exponential convergence in the noiseless case. The design approach applies to a wide class of systems and yields sampled-data observers that inherit all performance characteristics of the underlying continuous-time observers. The main component of the proposed sampled-data observer is a novel output predictor that encompasses both inter-sample predictors and ZOH-predictors., Comment: 14 pages, 1 figure, submitted to IEEE TAC for possible publication

Published
2019

30. Sampled-Data Observers for Delay Systems and Hyperbolic PDE-ODE Loops

Author

Ahmed-Ali, Tarek, Karafyllis, Iasson, and Giri, Fouad

Subjects
Mathematics - Optimization and Control, Electrical Engineering and Systems Science - Systems and Control
Abstract

This paper studies the problem of designing sampled-data observers and observer-based, sampled-data, output feedback stabilizers for systems with both discrete and distributed, state and output time-delays. The obtained results can be applied to time delay systems of strict-feedback structure, transport Partial Differential Equations (PDEs) with nonlocal terms, and feedback interconnections of Ordinary Differential Equations with a transport PDE. The proposed design approach consists in exploiting an existing observer, which features robust exponential convergence of the error when continuous-time output measurements are available. The observer is then modified, mainly by adding an inter-sample output predictor, to compensate for the effect of data-sampling. Using Lyapunov stability tools and small-gain analysis, we show that robust exponential stability of the error is preserved, provided the sampling period is not too large. The general result is illustrated with different examples including state observation and output-feedback stabilization of a chemical reactor., Comment: 32 pages, submitted for possible publication to SIAM Journal on Control and Optimization

Published
2019

31. Sampled-Data Observers for 1-D Parabolic PDEs with Non-Local Outputs

Author

Karafyllis, Iasson, Ahmed-Ali, Tarek, and Giri, Fouad

Subjects
Mathematics - Optimization and Control, Computer Science - Systems and Control
Abstract

The present work provides a systematic approach for the design of sampled-data observers to a wide class of 1-D, parabolic PDEs with non-local outputs. The studied class of parabolic PDEs allows the presence of globally Lipschitz nonlinear and non-local terms in the PDE. Two different sampled-data observers are presented: one with an inter-sample predictor for the unavailable continuous measurement signal and one without an inter-sample predictor. Explicit conditions on the upper diameter of the (uncertain) sampling schedule for both designs are derived for exponential convergence of the observer error to zero in the absence of measurement noise and modeling errors. Moreover, explicit estimates of the convergence rate can be deduced based on the knowledge of the upper diameter of the sampling schedule. When measurement noise and/or modeling errors are present, Input-to-Output Stability (IOS) estimates of the observer error hold for both designs with respect to noise and modeling errors. The main results are illustrated by two examples which show how the proposed methodology can be extended to other cases (e.g., boundary point measurements)., Comment: 20 pages, submitted to Systems and Control Letters for possible publication

Published
2019

47. Modeling and adaptive neuro-fuzzy inference system control of quarter electric vehicle.

Author

Baz, Rachida, El Majdoub, Khalid, Giri, Fouad, and Ammari, Ossama

Subjects
TRAFFIC safety, BRUSHLESS electric motors, VEHICLE models, DYNAMIC stability, ACCELERATION (Mechanics)
Abstract

Electric vehicles (EVs) have gained importance in recent years, prompting the development of several control systems to improve their efficiency and performance. In this work, a quarter electric vehicle (QEV) was controlled using a conventional proportional integral derivative (PID) and fuzzy controller to examine and compare with the response of the adaptive neurofuzzy inference system (ANFIS) controller. The response of the ANFIS controller was evaluated using MATLAB/Simulink according to different parameters and compared with those of other controllers. In addition, the simulation was based on different driving conditions such as the acceleration and deceleration modes and the type of road: wet and dry. The simulations were carried out on a longitudinal electric vehicle model based on a brushless DC motor, including the Pacejka tire model. The results showed that the ANFIS controller outperformed the PID and fuzzy logic controllers, providing superior dynamic responsiveness and stability when the ANFIS controller smoothly followed the input speed and the longitudinal slip value reached 3%. [ABSTRACT FROM AUTHOR]

Published
2024
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48. Sliding Mode Control of a Cascade Boost Converter for Fuel Cell Energy Generation System

Author

Belhaj, Fatima Zahra, El Fadil, Hassan, Tahri, Abdelouahad, Gaouzi, Khawla, Rachid, Aziz, Giri, Fouad, Abdalla, Hassan, Editorial Board Member, Abdul Mannan, Md., Editorial Board Member, Alalouch, Chaham, Editorial Board Member, Boemi, Sofia Natalia, Editorial Board Member, Bougdah, Hocine, Editorial Board Member, Bozonnet, Emmanuel, Editorial Board Member, De Bonis, Luciano, Editorial Board Member, Hawkes, Dean, Editorial Board Member, Kostopoulou, Stella, Editorial Board Member, Mahgoub, Yasser, Editorial Board Member, Mesbah Elkaffas, Saleh, Editorial Board Member, Mohareb, Nabil, Editorial Board Member, O. Gawad, Iman, Editorial Board Member, Oostra, Mieke, Editorial Board Member, Pignatta, Gloria, Editorial Board Member, Pisello, Anna Laura, Editorial Board Member, Rosso, Federica, Editorial Board Member, Pradhan, Biswajeet, Editorial Board Member, Amer, Mourad, Series Editor, El Hani, Soumia, editor, and Essaaidi, Mohamad, editor

Published
2019
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49. Lyapunov-Based Control of Single-Phase AC–DC Power Converter for BEV Charger

Author

Rachid, Aziz, EL Fadil, Hassan, Belhaj, F. Z., Gaouzi, K., Giri, Fouad, Abdalla, Hassan, Editorial Board Member, Abdul Mannan, Md., Editorial Board Member, Alalouch, Chaham, Editorial Board Member, Boemi, Sofia Natalia, Editorial Board Member, Bougdah, Hocine, Editorial Board Member, Bozonnet, Emmanuel, Editorial Board Member, De Bonis, Luciano, Editorial Board Member, Hawkes, Dean, Editorial Board Member, Kostopoulou, Stella, Editorial Board Member, Mahgoub, Yasser, Editorial Board Member, Mesbah Elkaffas, Saleh, Editorial Board Member, Mohareb, Nabil, Editorial Board Member, O. Gawad, Iman, Editorial Board Member, Oostra, Mieke, Editorial Board Member, Pignatta, Gloria, Editorial Board Member, Pisello, Anna Laura, Editorial Board Member, Rosso, Federica, Editorial Board Member, Pradhan, Biswajeet, Editorial Board Member, Amer, Mourad, Series Editor, El Hani, Soumia, editor, and Essaaidi, Mohamad, editor

Published
2019
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