Consider the system shown in Fig. 6.97. (a) Construct an inverse Nyquist plot of
Chapter 6, Problem 6.69(choose chapter or problem)
Consider the system shown in Fig. 6.97. (a) Construct an inverse Nyquist plot of [Y(j)/E(j)] 1 . (See Appendix W6.) (b) Show how the value of K for neutral stability can be read directly from the inverse Nyquist plot. (c) For K = 4, 2, and 1, determine the gain and phase margins. (d) Construct a root-locus plot for the system, and identify corresponding points in the two plots. To what damping ratios do the GM and PM of part (c) correspond?
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