Abstract
The D.C servo motor is a stable system. In a real-time, stable system is easy to control and it fit for any controllers. This D.C servo motor is used for aircraft rudder position control. Fuzzy logic based LQR controller is proposed to control the position of DC servo motor. This process is useful to control the rudder position of the aircraft system. The D.C servo motor consists of a weight disk that mounted on the rotor. If there is a change in the weight of the disk produces an error value. The error value and rate of change error value are given as the two inputs to the fuzzy logic. The output of fuzzy logic gives the Q value by which plant control action is done effectively. The weight disk acts as a disturbance to the servo motor, it moves stables system to an unstable system. The fuzzy logic implemented with LQR controller helps to reduce the error and it automatically controls the servo motor. From this fuzzy output, Q value makes changes in the LQR controller it helpful to obtain optimal gain value. Fuzzy-based LQR controller produces better steady-state position output than the PID controller steady-state position output.
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