Loading...
Search for:
adaptive-back-stepping
0.005 seconds
Suppression of torsional vibrations in drilling systems by using the optimization-based adaptive back-stepping controller
, Article International Journal of Mechanics and Control ; Volume 20, Issue 1 , 2019 , Pages 105-110 ; 15908844 (ISSN) ; Fakhar, M ; Sharif University of Technology
Levrotto and Bella
2019
Abstract
Stick-slip oscillations are one of the main sources of system failure and bit damage in a rotary drilling system. Thus, suppressing such vibrations is of great importance. There are different modelling approaches demonstrating drill string dynamics, among which lumped parameter models are more common in control studies due to faster computations. Since the system dynamic includes uncertain terms, in this paper an adaptive back-stepping controller is proposed. To tune controller gains, particle swarm optimization algorithm has been employed which guarantees a better control performance. The simulation results demonstrate the feasibility of the designed controller. The results have been also...
Adaptive integrated guidance and fault tolerant control using backstepping and sliding mode
, Article International Journal of Aerospace Engineering ; Volume 2015 , September , 2015 ; 16875966 (ISSN) ; Ashrafifar, A ; Mohsenipour, R ; Sharif University of Technology
Hindawi Publishing Corporation
2015
Abstract
A new method of integrated guidance and control for homing missiles with actuator fault against manoeuvring targets is proposed. Model of the integrated guidance and control system in the pitch plane with actuator fault and some uncertainty is developed. A control law using combination of adaptive backstepping and sliding mode approaches is designed to achieve interception in the presence of bounded uncertainties and actuator fault. Simulation results show that new approach has better performance than adaptive backstepping and has good performance in the presence of actuator fault
Tracking control of an underwater vehicle using adaptive back-stepping with tuning function
, Article DETC2005: ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, Long Beach, CA, 24 September 2005 through 28 September 2005 ; Volume 4 , 2005 , Pages 131-138 ; 0791847411 (ISBN); 9780791847411 (ISBN) ; Saghafi, M. M ; Sharif University of Technology
American Society of Mechanical Engineers
2005
Abstract
In this article the design and simulation of a velocity and position control for an underwater Remotely Operated Vehicle (ROV) is addressed. The system has a nonlinear dynamic with parametric uncertainties making it a reasonable test-bed for investigating the effectiveness of robust nonlinear control algorithms. The studied ROV can be actively controlled along the 3 Cartesian coordinate directions and rotated about the vertical axis using 4 thrusters positioned on the ROV. The dynamics of the actuator system, consisting of thrusters, is assumed to be a first order linear system with an unknown parameter. To control this system adaptive back-stepping, as a robust adaptive nonlinear control...
Satellite Attitude Control with Consideration of the Fuel Sloshing Dynamics
, M.Sc. Thesis Sharif University of Technology ; Salarieh, Hassan (Supervisor) ; Nejat Pishkenari, Hossein (Supervisor)
Abstract
Modeling and Controlling of a satellites fuel slosh is considered a vital problem in the field of satellite attitude control. In this paper modeling and control of the attitude of a satellite carrying a partially filled spherical fuel tank, which uses the diaphragm as a propellant management device (PMD), has been studied. The fuel slosh dynamics is modeled using a spherical pendulum with two degrees of freedom and a rigid arm, which represents the first mode of sloshing. The effects of the diaphragm that surround the fuel surface, are considered as torsional springs and dampers attached to the satellite body. The combined dynamics equations of the satellite rigid motion and the fuel slosh...
Nonlinear integrated guidance and control based on adaptive backstepping scheme
, Article Aircraft Engineering and Aerospace Technology ; Volume 89, Issue 3 , 2017 , Pages 415-424 ; 17488842 (ISSN) ; Fathi Jegarkandi, M ; Shamaghdari, S ; Sharif University of Technology
Emerald Group Publishing Ltd
2017
Abstract
Purpose: The purpose of this paper is to design an adaptive nonlinear controller for a nonlinear system of integrated guidance and control. Design/methodology/approach: A nonlinear integrated guidance and control approach is applied to a homing, tail-controlled air vehicle. Adaptive backstepping controller technique is used to deal with the problem, and the Lyapanov theory is used in the stability analysis of the nonlinear system. A nonlinear model of normal force coefficient is obtained from an existing nonlinear model of lift coefficient which was validated by open loop response. The simulation was performed in the pitch plane to prove the benefits of the proposed scheme; however, it can...