A process with a transfer function Gp(s) is controlled by a proportional controller in a standard feedback control loop.

(a) Discuss whether the process is stable or not.

(b) Transfer function of the fnal control valve, one of the other standard elements in the loop Gv(s) and the transfer function of the measuring element is Gh(s) given. Draw the block diagram of the feedback control loop.

(c) At what range value should the gain of the K_C proportional controller be for the loop to be stable?

(d) Show that the feedback loop system is stable by trying one of the K_C values at which the system is stable

A process with a transfer function GP(s)=(s2+1.6s4)10 is controlled by a proportional controller in a standard feedback control loop. (a) Discuss whether the process is stable or not. (b) Transfer function of the final control valve, one of the other standard elements in the loop GV(s)=(s+10)1 and the transfer function of the measuring element is GH=(s+5)1 given. Draw the block diagram of the feedback control loop. (c) At what range value should the gain of the KC proportional controller be for the loop to be stable? (d) Show that the feedback loop system is stable by trying one of the KC values at which the system is stable