Autor: Hammami, M. A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: On the region of attraction of dynamical systems: Application to Lorenz equations
Autorzy:: Hammami, M. A.
Rettab, N. H.
Powiązania:: https://bibliotekanauki.pl/articles/229791.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: nonlinear dynamical systems
Lyapunov function
basin of attraction
Lorenz equations
Opis:: Many nonlinear dynamical systems can present a challenge for the stability analysis in particular the estimation of the region of attraction of an equilibrium point. The usual methodis based on Lyapunov techniques. For the validity of the analysis it should be supposed that the initial conditions lie in the domain of attraction. In this paper, we investigate such problem for a class of dynamical systems where the origin is not necessarily an equilibrium point. In this case, a small compact neighborhood of the origin can be estimated as an attractor for the system. We give a method to estimate the basin of attraction based on the construction of a suitable Lyapunov function. Furthermore, an application to Lorenz system is given to verify the effectiveness of the proposed method.
Źródło:: Archives of Control Sciences; 2020, 30, 3; 389-409
1230-2384
Pojawia się w:: Archives of Control Sciences
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: An exponential observer and a controller for a class of nonlinear systems
Autorzy:: Hammami, M. A.
Zribi, M
Kallel, J
Powiązania:: https://bibliotekanauki.pl/articles/229713.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: nonlinear system
observer
stability
controller
stabilization
Opis:: In this paper, we study the observer design problem for a class of nonlinear systems. Specifically, we design an exponential observer for a separately excited DC motor. Moreover, a stabilizing controller is designed for the system to ensure the exponential stability of the solutions toward their desired values. Simulations results show that proposed observer is able to reconstruct the states of the system. In addition, the simulation results indicate that the designed controller works well.
Źródło:: Archives of Control Sciences; 2013, 23, 1; 79-92
1230-2384
Pojawia się w:: Archives of Control Sciences
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Stabilization of a certain class of fuzzy control systems with uncertainties
Autorzy:: Taieb, N. H.
Hammami, M. A.
Delmotte, F.
Powiązania:: https://bibliotekanauki.pl/articles/229196.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Takagi-Sugeno fuzzy systems
PDC controller
global uniform practical exponential stability
Lyapunov stability
parametric uncertainty
Opis:: In this paper, we investigate the global uniform practical exponential stability for a class of uncertain Takagi-Sugeno fuzzy systems. The uncertainties are supposed uniformly to be bounded by some known integrable functions to obtain an exponential convergence toward a neighborhood of the origin. Therefore, we use common quadratic Lyapunov function (CQLF) and parallel distributed compensation (PDC) controller techniques to show the global uniform practical exponential stability of the closed-loop system. Numeric simulations are given to validate the proposed approach.
Źródło:: Archives of Control Sciences; 2017, 27, 3; 453-481
1230-2384
Pojawia się w:: Archives of Control Sciences
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: A separation principle for Takagi-Sugeno control fuzzy systems
Autorzy:: Hadj Taieb, N.
Hammami, M. A.
Delmotte, F.
Powiązania:: https://bibliotekanauki.pl/articles/229205.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: T-S model
PDC controller
fuzzy observer
separation principle
Opis:: An important application of state estimation is feedback control: an estimate of the state (typically the mean estimate) is used as input to a state-feedback controller. This scheme is known as observer based control, and it is a common way of designing an output-feedback controller (i. e. a controller that does not have access to perfect state measurements). In this paper, under the fact that both the estimator dynamics and the state feedback dynamics are stable we propose a separation principle for Takagi-Sugeno fuzzy control systems with Lipschitz nonlinearities. The considered nonlinearities are Lipschitz or meets an integrability condition which have no influence on the LMI to prove the stability of the associated closed-loop system. Furthermore, we give an example to ullistrate the applicability of the main result.
Źródło:: Archives of Control Sciences; 2019, 29, 2; 227-245
1230-2384
Pojawia się w:: Archives of Control Sciences
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Modal analysis of back-to-back planetary gear: experiments and correlation against lumped-parameter model
Autorzy:: Hammami, A.
Rincon, A. F. del
Rueda, F. V.
Chaari, F.
Haddar, M.
Powiązania:: https://bibliotekanauki.pl/articles/280785.pdf
Data publikacji:: 2015
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: back-to-back planetary gears
modal analysis
lumped-parameter
impact test
Opis:: In order to characterize the dynamic behaviour of a back-to-back planetary gear, experimental and numerical modal analysis techniques are achieved. Rotational and translational modal deflections are highlighted. Natural frequencies are compared to the results from the lumped-parameter model. The modes are presented in the numerical studies in low-frequency and high-frequency bands. Distributions of modal kinetic and strain energies are studied.
Źródło:: Journal of Theoretical and Applied Mechanics; 2015, 53, 1; 125-138
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 6.

Tytuł:: Biochemical characterization of fennel (Ferula communis L.) different parts through their essential oils, fatty acids and phenolics
Autorzy:: Rahali, F.Z.
Lamine, M.
Rebey, I.B.
Wannes, W.A.
Hammami, M.
Selmi, S.
Mliki, A.
Sellami, I.H.
Powiązania:: https://bibliotekanauki.pl/articles/13078790.pdf
Data publikacji:: 2021
Wydawca:: Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Źródło:: Acta Scientiarum Polonorum. Hortorum Cultus; 2021, 20, 1; 3-14
1644-0692
Pojawia się w:: Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:: Biblioteka Nauki

Artykuł

Informacja