Feedback control scheme, proportional-only controller & bias problem. Consider t

Question

Feedback control scheme, proportional-only controller & bias problem.

Consider the pressure vessel below. Draw a feedback control scheme to control the pressure in the tank. Define the control variables and elements. The pressure transmitter, PT77, has a range of 0 to 100 psig. The controller will be a proportional-only controller its bias value is set at mid-scale, and its set point is 10 psig. Obtain the correct action of the controller and the proportional band required so that when the pressure in the tank is 30 psig, the valve will be wide open.

Explanation / Answer

The forces acting are the total pressures caused by the internal pressure p and the total tension in the walls T.
F=pA=pDLF=pA=pDL

T=tAwall=ttLT=tAwall=ttL

FH=0FH=0

F=2TF=2T

pDL=2(ttL)

Related Questions

Navigate

• Browse (All)
• Browse F
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.