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RISS 인기검색어
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- 저자 : Allaoua, Boumediene (검색결과 7 건)
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Allaoua, Boumediene,Laoufi, Abdellah The Korean Institute of Electrical Engineers 2011 Journal of Electrical Engineering & Technology Vol.6 No.1
The development of electric vehicle power electronics system control, composed of DC-AC inverters and DC-DC converters, attract much research interest in the modern industry. A DC-AC inverter supplies the high-power motor torques of the propulsion system and utility loads of electric vehicles, whereas a DC-DC converter supplies the conventional low-power and low-voltage loads. However, the need for high-power bidirectional DC-DC converters in future electric vehicles has led to the development of many new topologies of DC-DC converters. The nonlinear control of power converters is an active research area in the field of power electronics. This paper focuses on the use of the fuzzy sliding mode strategy as a control strategy for buck-boost DC-DC converter power supplies in electric vehicles. The proposed fuzzy controller specifies changes in control signals based on the surface and knowledge on surface changes to satisfy the sliding mode stability and attraction conditions. The performance of the proposed fuzzy sliding controller is compared to that of the classical sliding mode controller. The satisfactory simulation results show the efficiency of the proposed control law, which reduces the chattering phenomenon. Moreover, the obtained results prove the robustness of the proposed control law against variations in load resistance and input voltage in the studied converter.
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Fine Granularity Access Rights for Information Flow Control in Object Oriented Systems
Allaoua Maamir,Abdelaziz Fellah,Lina A. Salem 보안공학연구지원센터 2008 International Journal of Security and Its Applicat Vol.2 No.3
One of the main features of information flow control is to ensure the enforcement of privacy and regulated accessibility. However, most information flow control models that have been proposed do not provide substantial assurance to enforce end-to-end confidentiality policies or they are too restrictive, overprotected, and inflexible. We present a model for discretionary access controls that is in harmony with the object oriented paradigm. The model uses access rights applied to object attributes and methods, thus allowing considerable flexibility without compromising system security by leaking sensitive information. Models based on message filtering intercept every message exchanged among objects to control the flow of information. We present an algorithm which enforces message filtering based on the defined access rights.
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Boumediene ALLAOUA,Abdellah LAOUFI 대한전기학회 2011 Journal of Electrical Engineering & Technology Vol.6 No.1
The development of electric vehicle power electronics system control, composed of DC-AC inverters and DC-DC converters, attract much research interest in the modern industry. A DC-AC inverter supplies the high-power motor torques of the propulsion system and utility loads of electric vehicles, whereas a DC-DC converter supplies the conventional low-power and low-voltage loads. However, the need for high-power bidirectional DC-DC converters in future electric vehicles has led to the development of many new topologies of DC-DC converters. The nonlinear control of power converters is an active research area in the field of power electronics. This paper focuses on the use of the fuzzy sliding mode strategy as a control strategy for buck-boost DC-DC converter power supplies in electric vehicles. The proposed fuzzy controller specifies changes in control signals based on the surface and knowledge on surface changes to satisfy the sliding mode stability and attraction conditions. The performance of the proposed fuzzy sliding controller is compared to that of the classical sliding mode controller. The satisfactory simulation results show the efficiency of the proposed control law, which reduces the chattering phenomenon. Moreover, the obtained results prove the robustness of the proposed control law against variations in load resistance and input voltage in the studied converter.
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Gain Scheduling GMV using Gaussian Function for Nonlinear hysteretic Structural Systems
L. GUENFAF,S. ALLAOUA,M. DJEBIRI,M.S. BOUCHERIT,F. BOUDJEMA 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
In this paper, a generalized minimum variance algorithm using the gain scheduling technique is presented. First, we linearize the nonlinear model of the structure around a number of desired states representing regions of evolution of the structural response. Around each state, an Auto-Regressive-Moving-Average-eXogen (ARMAX) model of the structure is determined and a local GMV control law is developed. The control consists on switching-on or switching-off a local GMV controller depending on the actual state of the system. The approach consists on using gaussian membership functions related to the domains around the points of linearization. The control from the local GMV controllers is weighed by these functions and added together to produce the final control.
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Linear Quadratic AMD Controller with an Observer for Buildings under Seismic Ground Motion
L. Guenfaf,S. Allaoua 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
This paper is devoted to the study of active control with an observer for the control of structural vibration using an electric servomotor active mass driver (AMD) system. Composed primarily of an electric servomotor and a ball screw, the electrical AMD system is free from noise problems, oil leakage, and labor-intensive maintenance that commonly are associated with hydraulic AMD systems. For technological reasons and for cost reasons the number of sensors is limited by using the Luenberger observer. This observer is based on the synthesis of a static gain to stabilize the error state estimation and the convergence of the observer status to the state of the real system. In this study an instantaneous linear quadratic control algorithm is adopted using an observer. Numerical simulation is performed using a single sensor on the top floor of a five-story steel frame structure under the conditions of a Kanai-Tajimi power spectral density function of ground acceleration.
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Flux Oriented Control of Active Mass Damper Induction Motor for Buildings Under Seismic Excitation
L. Guenfaf,S. Allaoua 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
This study investigated a flux oriented control of Active Mass Damper (AMD) induction motor for buildings under seismic ground motion. Composed primarily of an induction motor, a mass bloc and a ball screw, the electric-type active mass damper (AMD) system is free from noise problems, oil leakage, and labor-intensive maintenance that commonly are associated with hydraulic AMD systems. In this study a five steel-frame structure is implemented with the electric type AMD system. An LQR control algorithm is adopted for displacement reduction of the structure subjected to ground acceleration. The indirect flux oriented control method is used for the control of the AMD induction motor. The great advantage of this method resides in the fact that we do not need to use the amplitude of the rotor flux but only its position. Numerical simulation is performed under the conditions of a Kanai-Tajimi power spectral density function of ground motion and the simulation results show that the torque supplied by the induction motor pursuits its reference provided by the LQR control algorithm. Significant reductions of 65% and 78% respectively in the roof acceleration and roof displacement have been reached. And the proposed system is recommended for practical implementation.
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