Question: Proportional control action applied to the flow rate qmi can be used to control the liquid height of the system shown in Figure P11.20. Consider

Proportional control action applied to the flow rate qmi can be used to control the liquid height of the system shown in Figure P11.20. Consider the specific plant
Gp (s) = H2 (s) / Qmi (s) = 1 / s2 + 3s + 2
Use the root locus plot to design a PI controller for this system to minimize the dominant time constant, with a damping ratio of ( = 0.707.

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