Fault tolerant flight control applications for a fixed wing UAV using linear and nonlinear approaches

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2019

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Ergöçmen, Burak

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Control surface or actuator faults or failures in any flight, lead to system-induced loss of control in flight (LOC-I) and results can be fatal. In this thesis, to prevent these accidents, an active fault-tolerant flight control (FTFC) is proposed. The system consists of the nonlinear control technique, state-dependent Riccati equation (SDRE) and linear controller techniques. Besides, examples for emergency cases; control surface damage, degradation, stuck and turbulence are studied for different levels. In addition, if there is a problem with regard to the construction of the state-dependent coefficient (SDC) matrices for SDRE controller, the solution is to change to a Linear Quadratic Regulator (LQR) and Linear Quadratic Tracking (LQT). To prevent these emergencies, a Reconfigure Mechanism (RM) sends signals in real-time to the SDRE controller to slow down or accelerate the control surface movement or change to LQR/LQT controller to prevent LOC-I. Comparative figures are given to illustrate the effectiveness of the hybrid controller architecture.

Subject Keywords

Flight control., Drone aircraft., Flying-machines., Autonomous vehicles., Vehicles, Remotely piloted.

URI

http://etd.lib.metu.edu.tr/upload/12623074/index.pdf
https://hdl.handle.net/11511/28057

Collections

Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

B. Ergöçmen, “Fault tolerant flight control applications for a fixed wing UAV using linear and nonlinear approaches,” M.S. - Master of Science, Middle East Technical University, 2019.