The Nyquist diagrams for two stable, open-loop systems are sketched in Fig. 6.100. The
Chapter 6, Problem 6.38(choose chapter or problem)
The Nyquist diagrams for two stable, open-loop systems are sketched in Fig. 6.100. The proposed operating gain is indicated as K0 , and arrows indicate increasing frequency. In each case give a rough estimate of the following quantities for the closed-loop (unity feedback) system: (a) Phase margin (b) Damping ratio (c) Range of gain for stability (if any) (d) System type (0, 1, or 2) Figure 6.100 Nyquist plots for 6.38
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