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Observer-based adaptive fuzzy controller for nonlinear systems with unknown control directions and input saturation
, Article Fuzzy Sets and Systems ; Volume 314 , 2017 , Pages 24-45 ; 01650114 (ISSN) ; Shahrokhi, M ; Khajeh Talkhoncheh, M ; Sharif University of Technology
Elsevier B.V
2017
Abstract
This paper addresses design of an observer-based adaptive fuzzy controller for a class of single-input–single-output (SISO) nonlinear systems with unknown dynamics subject to input nonlinearity and unknown direction. The proposed controller is singularity free. A high-gain observer is designed to estimate the unmeasured states, and the Lipschitz condition for proving boundedness of the estimated states is relaxed. The Nussbaum function is used to handle the unknown virtual control directions and the backstepping technique has been applied for controller design. It is proved that all closed loop signals are semi-globally uniformly ultimately bounded (SGUUB) and the output tracking error...
Observer-based adaptive fuzzy controller for nonlinear systems with unknown control directions and input saturation
, Article Fuzzy Sets and Systems ; May , 2016 ; 01650114 (ISSN) ; Shahrokhi, M ; Khajeh Talkhoncheh, M ; Sharif University of Technology
Elsevier
2016
Abstract
This paper addresses design of an observer-based adaptive fuzzy controller for a class of single-input-single-output (SISO) nonlinear systems with unknown dynamics subject to input nonlinearity and unknown direction. The proposed controller is singularity free. A high-gain observer is designed to estimate the unmeasured states, and the Lipschitz condition for proving boundedness of the estimated states is relaxed. The Nussbaum function is used to handle the unknown virtual control directions and the backstepping technique has been applied for controller design. It is proved that all closed loop signals are semi-globally uniformly ultimately bounded (SGUUB) and the output tracking error...
Evaluation of Several Design Methods of Nonlinear Observers and Comparing their Performances
, M.Sc. Thesis Sharif University of Technology ; Shahrokhi, Mohammad (Supervisor)
Abstract
The main objective of this study is evaluation of several nonlinear observers and comparing their performances.First, the literature review is presented; and then the process model is described. Second, observability and the observer design is disscused. Performances of Lunberger, sliding, and high gain nonlinear observers have been compared. Finally, the performance of a high gain observer in a closed-loop system including the back stepping controller has been evaluated.
Design of a Sliding Mode Observer to Estimate the Charge of Vanadium Redox Flow Batteries
, M.Sc. Thesis Sharif University of Technology ; Pishvaie, Mahmood Reza (Supervisor)
Abstract
One of the main challenges in managing flow batteries usage is estimating their state of charge. Since The concentration of ions in the battery indicates the battery's charge and, on the other hand, the sensors for measuring the concentration are expensive, observers should be used to estimate the concentrations of the ions in the battery. This work is done by measuring the cell voltage, and finally, using the mathematical model of the battery, the amount of concentrations and state of charge is calculated. In this work, a vanadium flow battery was initially modeled accurately and mechanistically using COMSOL software to replace an actual flow battery in subsequent studies. Also, two...