Question 8.4.6: An automatic control system for controlling the thickness of...
An automatic control system for controlling the thickness of sheet metal is given in Figure 1.10. A simplified block diagram of this system is given in Figure 8.32.
Construct the Nyquist diagram and determine the range of values of K for which the closed-loop system is stable. The controller transfer function G_c(s) is specified as follows:
(a) G_c(s)=K, i.e., the controller is a gain amplifier
(b) G_c(s)=K(0.5+s), i.e., when the controller is a PD controller (see Subsec.9.6.2).
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