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Unformatted text preview: of instability 14.11 for the control shown, the characteristics equation is ) 1 ( 4 6 4 2 3 4 = + + + + + k s s s s (a) determine value of k above which the system is unstable. (b) Determine the value of k for which the two of the roots are on the imaginary axis, and determine the values of these imaginary roots and remaining roots are real. ) 1 ( 4 6 4 2 3 4 = + + + + + k s s s s...
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- Spring '10