Q2. Experimental data from a stable open-loop system result in the frequency response shown in the Nyquist plot below. Imag 0.8 0.6 F0.4 0.2 Re -1.0 -0.8 -0.6 -0.4 -0.2 0.2 0,4 0.6 0.8 E-0.2 E-0.4 0.6 -0.8 (a) Show that the closed-loop system with unity negative feedback is also stable. (b) Comment on the stability if the magnitude is increased by 20DB (a factor of 10).
Q2. Experimental data from a stable open-loop system result in the frequency response shown in the Nyquist plot below. Imag 0.8 0.6 F0.4 0.2 Re -1.0 -0.8 -0.6 -0.4 -0.2 0.2 0,4 0.6 0.8 E-0.2 E-0.4 0.6 -0.8 (a) Show that the closed-loop system with unity negative feedback is also stable. (b) Comment on the stability if the magnitude is increased by 20DB (a factor of 10).
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Transcribed Image Text:Q2. Experimental data from a stable open-loop system result in the frequency response
shown in the Nyquist plot below.
Imag
0.8
F0.6
0.4
0.2
Re
-1.0
-0.8
-0.6
-0.4 -0.2
0.2
0,4
0.6
0.8
-0.2
E-0.4
-0.6
-0.8
(a) Show that the closed-loop system with unity negative feedback is also stable.
(b) Comment on the stability if the magnitude is increased by 20DB (a factor of 10).
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