The block diagram of an autopilot designed to maintain the pitch attitude of an aircraft is shown in Fig. 3.64. The transfer function relating the elevator angle de and the pitch attitude is 0(s) δε (3) G(s) 50(8+1)(8+2) (825840) (s² + 0.03s + 0.06)' where is the pitch attitude in degrees and de is the elevator angle in 0 degrees. The autopilot controller uses the pitch attitude error e to adjust the elevator according to the transfer function de(8) e(s) = De(s) = K(s+3) 8 + 10 Using MATLAB, find a value of K that will provide an overshoot of less than 10% and a rise time faster than 0.5 sec for a unit-step change in 0. After examining the step response of the system for various values of K, 2A A Amplitude 0 A Time Control Aircraft 8 Ꮎ Σ De(s) G(s) Figure 3.64: Block diagram of autopilot for Problem 3.50 comment on the difficulty associated with making rise-time and overshoot measurements for complicated systems.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
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Hints: Find the closed loop transfer function and then plot the step response for diFerent
values of K in MATLAB. Show step response plot for different values of K.

 

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The block diagram of an autopilot designed to maintain the pitch attitude
of an aircraft is shown in Fig. 3.64. The transfer function relating the
elevator angle de and the pitch attitude is
0(s)
δε (3)
G(s)
50(8+1)(8+2)
(825840) (s² + 0.03s + 0.06)'
where is the pitch attitude in degrees and de is the elevator angle in
0
degrees. The autopilot controller uses the pitch attitude error e to adjust
the elevator according to the transfer function
de(8)
e(s)
=
De(s) =
K(s+3)
8 + 10
Using MATLAB, find a value of K that will provide an overshoot of less
than 10% and a rise time faster than 0.5 sec for a unit-step change in 0.
After examining the step response of the system for various values of K,
2A
A
Amplitude
0
A
Time
Control
Aircraft
8
Ꮎ
Σ
De(s)
G(s)
Figure 3.64: Block diagram of autopilot for Problem 3.50
comment on the difficulty associated with making rise-time and overshoot
measurements for complicated systems.
Transcribed Image Text:The block diagram of an autopilot designed to maintain the pitch attitude of an aircraft is shown in Fig. 3.64. The transfer function relating the elevator angle de and the pitch attitude is 0(s) δε (3) G(s) 50(8+1)(8+2) (825840) (s² + 0.03s + 0.06)' where is the pitch attitude in degrees and de is the elevator angle in 0 degrees. The autopilot controller uses the pitch attitude error e to adjust the elevator according to the transfer function de(8) e(s) = De(s) = K(s+3) 8 + 10 Using MATLAB, find a value of K that will provide an overshoot of less than 10% and a rise time faster than 0.5 sec for a unit-step change in 0. After examining the step response of the system for various values of K, 2A A Amplitude 0 A Time Control Aircraft 8 Ꮎ Σ De(s) G(s) Figure 3.64: Block diagram of autopilot for Problem 3.50 comment on the difficulty associated with making rise-time and overshoot measurements for complicated systems.
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