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Unformatted text preview: -4-2 2 4 6 8 Root Locus Real Axis Assignment #23 (Revised) p.2 ECSE-2410 Signals & Systems - Spring 2009 Due Fri 04/24/09 4(30). Using Nyquist and Bode plots and Bode approximations, find gain constant K at which the feedback systems shown are just on the verge of instability. Sketch the Nyquist and Bode (straight line magnitude and smooth phase) diagrams. (a) ( ) 3 1 1 ) ( + = s s G (b) ( ) 2 1 1 ) ( + = s s s G-+ ) ( s G X ( s ) (c) ( ) 1 ) ( 5 + = s s e s G s Revised Problem 5: 5(30). Using the feedback block diagram in problem 4 above where + + + = 100 1 10 1 1 1 400 ) ( s s s s G , (a) Sketch both the Bode straight line magnitude and the smooth phase diagrams. (b) Use Bode approximations to show that this system is unstable. (c) Sketch the Nyquist plot. Y ( s ) K...
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