Browsing by Author "Castanho, Emanuel da Costa"
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- Aircraft Attitude Tracking using a Model Reference Adaptive ControlPublication . Castanho, Emanuel da Costa; Bousson, KouamanaA discrete-time explicit Model Reference Adaptive Control (MRAC) with constant trace algorithm is applied to a linearized aircraft model during longitudinal and lateral-directional motions in order to test the performance of this type of control during specific flight conditions. The model was obtained through system identification with data generated from the linearized state equations of the F-4C. In the longitudinal case the aircraft behaves like a Single-Input-Single-Output (SISO) system and simulations are performed for two examples of pitch angle data, in which two expressions for the control (classic and penalized) are applied in each example to compare their performance. In the lateral-directional case the airplane behaves like a Multi-Input-Multi-Output (MIMO) system with equal number of inputs and outputs and the MRAC control law must be modified to describe a decoupling process. Simulations are performed in order to verify if the controller is able to handle the coupling relation between some variables, such as lateral velocity, roll angle, aileron angle and rudder angle. The adaptive control in both study cases and for the chosen initial conditions showed good tracking when following the reference output, presenting no drift problems. The choice of the initial simulation conditions is also analyzed, in order to prevent actuator saturation.