Question: The Bode plot for an open-loop transfer function (K G(s)) is shown in Figure 10.80. a. Determine the stability of the closed-loop system. b. Assume

The Bode plot for an open-loop transfer function $K G(s)$ is shown in Figure 10.80.

a. Determine the stability of the closed-loop system.

b. Assume that the proportional control gain $K$ is increased by a factor of 10 and 100, respectively. Will the closed-loop system still be stable with the new values of $K$ ?

FIGURE 10.80 Problem 6. Phase (degrees) Magnitude (dB) -180 -50 -100 0

FIGURE 10.80 Problem 6. Phase (degrees) Magnitude (dB) -180 -50 -100 0 -150 10-1 100 101 102 -270 10-1 100 10 102 Frequency (rad/s)

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