CP10.10 Consider the feedback control system shown in Figure CP10.10. The time delay is T = 0.7 s. Plot the phase margin for the system versus the gain in the range 0.1 ≤ ≤ K 10. Determine the gain K that maximizes the phase margin. What is the stability limit for K?

R(s) FIGURE CP10.10 Feedback control system with a time delay. Time delay e-st Process k(s +0.1) 3+55 Y(s)