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This page shows the Simulink blocks used to simulate the open-loop response and implement the closed-loop autopilot controllers for the longitudinal and lateral-directional axes.
Longitudinal Open-Loop System
Longitudinal Open-Loop System
At sea-level operating conditions, a doublet input was applied to simulate elevator deflection. The pole-zero plot showed that the system was neutrally stable, and after 1000 seconds, the response of the state space variables exhibited slowly growing oscillation. To improve system performance and ensure that the system does not diverge, a controller is necessary.
Pitch Angle Controller
Pitch Angle Controller
A PID controller with actuator dynamics was applied to achieve a target pitch angle of 0°.
Lateral-Directional Open-Loop System
Lateral-Directional Open-Loop System
At sea-level operating conditions, a doublet input was applied to simulate aileron and rudder deflection. The pole-zero map showed that the system was unstable, and after 700 seconds, the response of the state-space variables exponentially diverged, showing the need for a controller.
Roll Angle Controller
Roll Angle Controller
A PID controller with actuator dynamics and an actuator saturation limit of 15° was used to obtain the target roll angle of 5°.
Heading Angle Controller
Heading Angle Controller
A PID controller with actuator dynamics and an actuator saturation limit of 15° was used to obtain the target heading angle of 10°.
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