Robust Adaptive Attitude Stabilization of a Fighter Aircraft in the Presence of Input Constraints

Publish Year: 1395
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:

JR_JECEI-4-2_006

تاریخ نمایه سازی: 23 دی 1396

Abstract:

The problem of attitude stabilization of a fighter aircraft is investigated in this paper. The practical aspects of a real physical system like existence of external disturbance with unknown upper bound and actuator saturation are considered in the process of controller design for this aircraft. In order to design a robust autopilot in the presence of the actuator saturation, the Composite Nonlinear Feedback (CNF) controller along with the Adaptive Integral Sliding Mode (AISM) controller and the new robust controller that is called AISM-CNF control law is proposed. The CNF part of the controller is used for stabilization of the nominal system and also improvement of the transient performance by considering the actuator saturation. The AISM part guarantees robustness against the model uncertainties and/or external disturbances. Since in the proposed approach, the upper bound of the uncertain terms is estimated and therefore there is no need to the prior knowledge about the upper bound of the model uncertainties. Finally, simulation results show the performance of the proposed AISM-CNF controller in terms of attitude stabilization of fighter aircraft, robustness, and the good characteristics of the transient responses of the autopilot system in spite of actuator saturation and external disturbance.

Keywords:

Fighter Aircraft , Input Constraints , Composite Nonlinear Feedback (CNF) , Adaptive Integral Sliding Mode (AISM)

Authors

Majid Bahmani

Department of Electrical and Electronic Engineering, Shiraz University of Technology, Shiraz, Iran.

Tahereh Binazadeh

Department of Electrical and Electronic Engineering, Shiraz University of Technology, Shiraz, Iran.