HW11 - K for stability. (a) ) 3 )( 1 )( 1 ( ) 2 ( 3 ) ( + +...

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ECE 313 – Fall 2008 Homework # 11 Due Wednesday, November 19, 2008 The following problems apply to a feedback system with in the forward path and in the feedback path. The gain ) ( s G ) ( s H K is positive. For each of the following systems, 1. Sketch the Nyquist plot when 1 = K and use the Nyquist criterion to find out whether the system is stable; 2. Using the Nyquist criterion, find the range of
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Unformatted text preview: K for stability. (a) ) 3 )( 1 )( 1 ( ) 2 ( 3 ) ( + + + = s s s s K s G , 1 = H (b) ) 10 )( 1 ( ) ( + + = s s s K s G , 1 = H (c) ) 3 ( ) ( 2 + = s s K s G , ) 6 ( ) ( + = s s H You can use Matlab to draw the polar part of the Nyquist plot, but calculate the real-axis crossing points analytically....
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