An autopilot designed to hold an aircraft in straight and level flight is shown in Figure CP5.7.
Question:
(a) Suppose the controller is a constant gain controller given by Gc(s) = 2. Using the Isim function, compute and plot the ramp response for θd(t) = at, where a = 0.5°/s. Determine the attitude error after 10 seconds.
(b) If we increase the complexity of the controller, we can reduce the steady-state tracking error. With this objective in mind, suppose we replace the constant gain controller with the more sophisticated controller
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This type of controller is known as a proportional plus integral (PI) controller. Repeat the simulation of part (a) with the PI controller, and compare the steady-state tracking errors of the constant gain controller versus the PI controller.
Figure CP5.7
An aircraft autopilot block diagram.
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The mfile script and the simulations are shown in Figure CP57 FIGURE CP57 Closedloop system response ...View the full answer
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