Papers by Ahmed Said Nouri
International journal of electrical & electronics research, Mar 20, 2024
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In this work, we investigated the sliding mode control (SMC) for uncertain systems with both stat... more In this work, we investigated the sliding mode control (SMC) for uncertain systems with both state and input varying delays. In most existing SMC, a common input and delayed input matrix are considered to apply the conventional method, which is very restrictive assumption. Therefore, we proposed a new sliding surface which takes account of the system state and the control input in order to remove the restrictive assumption. The parameters of the sliding function are obtained using the linear matrix inequality. Furthermore, the Jensen's inequality and reciprocally convex approach are employed, to further reduce the conservatism in the existing results. A simulation example is studied to illustrates the advantages of this method.
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Mathematics, May 16, 2023
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In the case of linear and nonlinear dynamical systems generally, the full state vector is unknown... more In the case of linear and nonlinear dynamical systems generally, the full state vector is unknown on account to the nature of the system and the difficulty of the measure of some components of the state vector. The objective of this paper is an experimental comparison between two different sliding surface algorithms applied to the two real one link manipulators.
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Transactions of the Institute of Measurement and Control, Jun 1, 2017
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Mathématiques et applications, 2006
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Proceedings Of The Institution Of Mechanical Engineers, Part I: Journal Of Systems And Control Engineering, Jul 5, 2022
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Mathématiques & Applications, 2006
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International journal of computer applications, Aug 30, 2012
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The classical techniques of linear and nonlinear control of the non-constant parameters systems o... more The classical techniques of linear and nonlinear control of the non-constant parameters systems or nonlinear systems (the case of robots) do not often give very acceptable results. This is due to the margin between the control system and the system model chosen to elaborate the control of the actuator. The adaptive control represents a solution to the modelling gaps because
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2022 19th International Multi-Conference on Systems, Signals & Devices (SSD)
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2018 15th International Multi-Conference on Systems, Signals & Devices (SSD)
Discrete-time integral sliding mode control is widely applied using state space model. Therefore,... more Discrete-time integral sliding mode control is widely applied using state space model. Therefore, some systems are known only by their input-output measurement. In this work, a discrete-time integral sliding mode controller (DISMC) based only on Input-Output model is presented. The proposed approach is developed and considered as a new method for voltage controller of electronic power systems, such as DC-DC buck converter. The simulation results prove the efficiency of the proposed DISMC.
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Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering, 2021
The problem of sensitivity to uncertainties and disturbances is still a challenging task in the t... more The problem of sensitivity to uncertainties and disturbances is still a challenging task in the theory of discrete sliding mode controller. In this article, a discrete repetitive adaptive sliding mode control using only input-output measurements of linear time-varying system with periodic disturbances is proposed. A new indirect adaptive algorithm taken into account the periodicity of disturbances is used to identify parameter variations of the considered system. Based on this identification, discrete sliding mode controller is developed. Then, the structure of plug-in repetitive control is integrated into the previous controller to reject harmonic disturbances. A robustness analysis is achieved to ensure the asymptotic stability of the proposed controller. An example of time-varying DC-DC buck converter subject to harmonic disturbances is carried out to illustrate the effectiveness of the designed discrete repetitive adaptive sliding mode control.
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Systems, Automation, and Control, 2019
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2016 17th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering (STA), 2016
The study of retarded systems have been enticed many researchers due their potential in many prac... more The study of retarded systems have been enticed many researchers due their potential in many practical applications. In this work, a novel DSMC scheme for a linear system with state and input varying delay will be investigated. Using the LMI, the asymptotic stability of the closed loop system can be ensured, and the sliding surface can be designed at the same time. The celebrated cone complementarity linearization (CCL) is presented to solve a non-linear problem. Two simulations examples are studied to illustrates the advantages of this method.
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Lecture Notes in Electrical Engineering, 2016
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Studies in Systems, Decision and Control, 2016
Harmonic disturbance rejection is an important field of control theory and applications. In this ... more Harmonic disturbance rejection is an important field of control theory and applications. In this paper a discrete first and second order sliding mode control for multivariable systems are investigated. The necessary conditions of harmonic disturbances rejection using first and second order sliding mode control laws are elaborated. In order to improve the performances of sliding mode control in periodic disturbances rejection, a discrete repetitive sliding mode control is presented. A necessary condition for the choice of the discontinuous terms in discrete repetitive sliding mode control is then developed. The different proposed control strategies have been tested on numerical simulation example. The obtained results are very satisfactory in terms of compensation of periodic disturbances using discrete repetitive sliding mode control.
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2017 6th International Conference on Systems and Control (ICSC), 2017
The design of robust controller for an uncertain discrete-time nonlinear systems is considered in... more The design of robust controller for an uncertain discrete-time nonlinear systems is considered in this paper. Firstly, a discrete sliding mode control, based on using the inverse of nonlinear function, is proposed. While in the case of relatively high time varying parameters, the implementation of this control law requires the knowledge of parameters's values at each sample time which is not always possible. To resolve this problem, we develop a new indirect adaptive sliding mode control which is based on adapting the parameters of the control law using Matrix Recursive Least Square algorithm (M-RLS). The performances of the proposed strategies are confirmed by simulation example. The related results show that the robust adaptive method provides better performance compared with those given by sliding mode control.
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Journal of Control and Decision, 2016
A guaranteed cost sliding mode control (SMC) algorithm is investigated to further improve the con... more A guaranteed cost sliding mode control (SMC) algorithm is investigated to further improve the control accuracy of looper-tension systems in hot strip finishing mills. First, a global sliding mode surface function is designed by linear matrix inequalities and guaranteed cost technique, which can force the system states into switching region initially, and can guarantee the system robustness with a good performance during the whole control process. Then, a novel reaching law is designed, which can satisfy the sliding mode reaching conditions. Simulation results demonstrate that the proposed control scheme has good stability and robustness comparing with traditional SMC. The designed controller can regulate the strip tension and looper angle to ensure better performance, which is very suitable for complex looper systems.
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Papers by Ahmed Said Nouri