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Ovaysi, Elham, Kamali, Marzieh. (1402). Adaptive Output-Feedback Control for Switched Nonlinear Systems with Unknown Control Directions. نشریه مهندسی عمران امیرکبیر, 55(Issue 3 (Special Issue)), 405-416. doi: 10.22060/eej.2023.22317.5532
Elham Ovaysi; Marzieh Kamali. "Adaptive Output-Feedback Control for Switched Nonlinear Systems with Unknown Control Directions". نشریه مهندسی عمران امیرکبیر, 55, Issue 3 (Special Issue), 1402, 405-416. doi: 10.22060/eej.2023.22317.5532
Ovaysi, Elham, Kamali, Marzieh. (1402). 'Adaptive Output-Feedback Control for Switched Nonlinear Systems with Unknown Control Directions', نشریه مهندسی عمران امیرکبیر, 55(Issue 3 (Special Issue)), pp. 405-416. doi: 10.22060/eej.2023.22317.5532
Ovaysi, Elham, Kamali, Marzieh. Adaptive Output-Feedback Control for Switched Nonlinear Systems with Unknown Control Directions. نشریه مهندسی عمران امیرکبیر, 1402; 55(Issue 3 (Special Issue)): 405-416. doi: 10.22060/eej.2023.22317.5532

Adaptive Output-Feedback Control for Switched Nonlinear Systems with Unknown Control Directions

AUT Journal of Electrical Engineering
مقاله 8، دوره 55، Issue 3 (Special Issue)، 2023، صفحه 405-416    اصل مقاله (1.01 M)
نوع مقاله: Research Article
شناسه دیجیتال (DOI): 10.22060/eej.2023.22317.5532
نویسندگان
Elham Ovaysi* ؛ Marzieh Kamali
Department of Electrical and Computer Engineering, Isfahan University of Technology, Isfahan, Iran
چکیده
This article deals with the design of an adaptive controller for switched non-strict feedback nonlinear systems. In the studied system, the switching signal is arbitrary, the states are not measurable, and the signs of the control gain functions that describe the control directions are completely unknown. First, the unknown nonlinear functions in the switched system are approximated using the universal approximation theorem. Then, the unmeasured states are estimated using the linear state observer, and the controller is designed through an adaptive back-stepping design procedure. Due to the appropriate change of coordinates, 1) neither fuzzy nor radial basis function is used in the design of the controller, 2) only one adaptation law is designed to estimate the unknown parameters in the switched non-strict feedback nonlinear system, and 3) there is no Nussbaum function in the proposed adaptive controller so, the large control signal in the initial stages and the consequent damage to the actuators can be prevented. These features can lead to the simplicity of controller design and the reduction of computational burden. Therefore, the proposed method can be used for practical systems. The stability of the closed-loop system is proved using Lyapunov stability theory. It is shown that, in addition to the semi-globally uniformly ultimately boundedness of all closed loop signals, the tracking error converges to a small neighborhood around zero. In the end, the efficiency of the proposed control method is confirmed through the simulation results of an example.
کلیدواژه‌ها
Adaptive control؛ Switched nonlinear systems؛ Non-strict feedback nonlinear systems؛ Control directions
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