Browsing by Author "Loubar, Hocine"

Now showing 1 - 6 of 6

Active surge control of the recycle compression system by hybrid adaptive controller
(IEEE, 2019) Aribi, Yacine; Zammoum Boushaki, Razika; Loubar, Hocine
Centrifugal compressors are a Type of widely used compression systems for industrial gases. Practically, centrifugal and axial compressors often suffer huge and irreversible damages due to a major non-stability feature widely known as surge. In this paper, a control strategy is proposed in order to avoid falling into surge and to recover the system from deep surge state. An auto-tuned, PID-Based, model free approach based on Multi-stage Fuzzy Inference system is used to provide a real-time tuning for PID parameters in order to achieve optimal control for the Compression system’s recycle valve. The proposed control solution comes to prevent the system from falling into surge and shows promising results while recovering the system back into stability and maintaining stable operating point. Furthermore, a stable and robust, model free control, has been achieved for deep surge control
Altitude Back-stepping control of quadcopter
(IEEE, 2019) Loubar, Hocine; Zammoum Boushaki, Razika; Aribi, Yacine; Kouzou, Abdellah
This work deals with the study of the stabilization process of a nonlinear control system taking a certain model and derive state space equations through implementation of kinetic and dynamic equations where we present a challenging tool known as backstepping controllers based on Energy functions concept as presented by the famous Russian mathematician Lyaponuv. Simulation of the obtained results is done with Simulink
Feedback linearization control of multivariable and nonlinear systems (UAV)
(2022) Loubar, Hocine; Boushaki, Razika(Directeur de thèse)
ors have been widely used for many applications; furthermore, various techniques for their modelling and control have been proposed. Among the challenges encountered in the design of controllers for a quadrotor is the fact that it is a highly coupled and nonlinear multivariable system. It is also nown as being an under-actuated system because it uses four actuators to control six degrees of freedom. In this work, the nonlinear dynamic model of the quadrotor is formulated using the Newton-Euler method. Then different linear and nonlinear control techniques for quadrotor trajectory tracking are investigated. First, SMC and PD controllers for linear and nonlinear trajectory tracking of the quadrotor are implemented, and genetic algorithm is used to optimize the controller parameters according to different objective functions. Both techniques are evaluated and compared in terms of trajectory tracking capabilities, dynamic performance, and the effect of possible disturbances. Then, backstepping and gain scheduling ontrol techniques are designed in order to control the altitude and attitude of the quadrotor, in the absence of disturbances and also in a windy environment. Finally, a new feedback nearization approach based on coordinate transformation and state feedback, is proposed. In this approach, the state space description of nonlinear quadrotor system is transformed into a linear quasi block controller decoupled form, then eigenstructure assignment using state feedback is applied. The proposed approach is used to control a quadrotor, in order to assess its performance in terms of trajectory tracking capabilities, time response performance, robustness and robust stability. The simulation is carried out using MATLAB/Simulink software.
Modeling and control of UAV quadrotor
(IEEE, 2019) Zammoum Boushaki, Razika; Aribi, Yacine; Loubar, Hocine; Hamza, Younes; Kouzou, Abdellah
Since the advances in technologies and the ability to manufacture miniature sensors and controllers using the Micro-Electro-Mechanical Systems (MEMS) technologies, there have been a lot of advances in the Unmanned Aerial Vehicle (UAV) area. A lot of the research conducted focused on the quadrotor due to its previously mentioned advantages of easier manufacturing, compactness and maneuverability among others. a detailed description of the dynamic modelling of the Quadrotor is presented. Various control strategies like the Proportional Derivative Control, the Sliding Mode Control and the Backstepping Control methods have been elucidated and implemented in MATLAB and SIMULINK. Simulations have been carried out and the results have been presented
Modeling and simulation of three control techniques for UAV quadrotor
(IEEE, 2019) Loubar, Hocine; Zammoum Boushaki, Razika; Aribi, Yacine; Azouaou, Ait Said; Dorbane, Sedik; Kouzou, Abdellah
This paper presents the modeling of a four rotor type unmanned aerial vehicle (UAV) called the quadrotor and three techniques to control its altitude, attitude, heading and position. The dynamic model of the quadrotor is nonlinear and has been derived using Newton's and Euler's laws. The first approach is designed using a linear Proportional-Integral-Derivative (PID) control technique. The second approach is based on a nonlinear Back-stepping controller while the third one is a gain Gain-Scheduling based PID controller. The Genetic Algorithm technique has been used to get an optimal tuning for the gains and parameters of the three mentioned controllers. MATLAB/Simulink software was used to evaluate and compare the three designed control approaches in terms of the stability, the effect of possible disturbances and the dynamic performance
Sliding mode controller for linear and nonlinear trajectory tracking of a quadrotor
(Praise Worthy Prize, 2020) Loubar, Hocine; Boushaki, Razika Zamoum; Aouati, Ayoub; Bouanzoul, Mahdi
During the last decades, Unmanned Aerial Vehicles (UAV) quadrotors have been widely used for many applications; furthermore, various techniques for their modelling and control have been proposed. Among the challenges encountered in the design of controllers for a quadrotor is the fact that it is a highly coupled and nonlinear multivariable system. It is also known as being an under-actuated system because it uses four actuators to control six degrees of freedom. In this work, the nonlinear dynamic model of the quadrotor is formulated using the Newton-Euler method. Then SMC and PD controllers are designed in order to investigate linear and nonlinear trajectory tracking capabilities of the quadrotor. Step input response tests are also performed in order to study the performance of both controllers. Chattering effect of SMC controller is minimized using the boundary layer solution technique and genetic algorithm (GA) is used to tune the parameters of both PD and SMC controllers for better performance. The simulation is carried out using MATLAB Simulink and both techniques are compared in order to evaluate their dynamic performance and tracking capabilities