Problem #4 ' Consider the gas pressure control system shown below. The relationship betv flow rate of the two feed streams is given by the following Laplace domain m 0.4 0.4 P'(s) = Q{(s) + (0.15s + 1)(0.8s + 1) (0.15s + 1)(0.8s +1 The tank pressure is in psig, the flow rates are in ft/min (cfm), the time const gains have units of psi/cfm. The pressure is controlled by adjusting the flow : operated control valve has the following transfer function in which the time c gain has units of cfm/psi:

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Problem #4 !
Consider the gas pressure control system shown below. The relationship between tank pressure and the
flow rate of the two feed streams is given by the following Laplace domain model:
0.4
0.4
P'(s) =
- Q; (s) +
Q¿(s)
(0.15s + 1)(0.8s + 1)
(0.15s + 1)(0.8s +1)
The tank pressure is in psig, the flow rates are in ft/min (cfm), the time constants are in minutes, and the
gains have units of psi/cfm. The pressure is controlled by adjusting the flow rate of stream-2, q2. The air
operated control valve has the following transfer function in which the time constant is in minutes and the
gain has units of cfm/psi:
Q;(s)
P(s)
0.10s +1
The output from the pressure transmitter (PT) varies linearly from 4 to 20 mA as the pressure in the tank
varies from 0 to 32 psig. The sensor/ transmitter time constant is negligible. The proportional controller
(PC) output signal range is 4-20 mA, and it is transmitted to a current-to-pressure transducer (KIP).
(a) Draw a block diagram for the control system, and place the actual transfer function of each element
in the appropriate block of the diagram. Note: using the generic notation Ge, Gv, Gp, Gm, etc is not
ассеptable.
(b) Develop an approximate FOPDT for the open-loop model of the using Skogestad methodology.
(d) Design a pressure controller for the system that will provide good disturbance rejection and prevent
offset. Clearly identify the method you used to design your controller and the reasoning for your
choice. Determine the numerical values for your controller tuning parameters.
93
(PT
(PC
I/P
よ。
91
Transcribed Image Text:Problem #4 ! Consider the gas pressure control system shown below. The relationship between tank pressure and the flow rate of the two feed streams is given by the following Laplace domain model: 0.4 0.4 P'(s) = - Q; (s) + Q¿(s) (0.15s + 1)(0.8s + 1) (0.15s + 1)(0.8s +1) The tank pressure is in psig, the flow rates are in ft/min (cfm), the time constants are in minutes, and the gains have units of psi/cfm. The pressure is controlled by adjusting the flow rate of stream-2, q2. The air operated control valve has the following transfer function in which the time constant is in minutes and the gain has units of cfm/psi: Q;(s) P(s) 0.10s +1 The output from the pressure transmitter (PT) varies linearly from 4 to 20 mA as the pressure in the tank varies from 0 to 32 psig. The sensor/ transmitter time constant is negligible. The proportional controller (PC) output signal range is 4-20 mA, and it is transmitted to a current-to-pressure transducer (KIP). (a) Draw a block diagram for the control system, and place the actual transfer function of each element in the appropriate block of the diagram. Note: using the generic notation Ge, Gv, Gp, Gm, etc is not ассеptable. (b) Develop an approximate FOPDT for the open-loop model of the using Skogestad methodology. (d) Design a pressure controller for the system that will provide good disturbance rejection and prevent offset. Clearly identify the method you used to design your controller and the reasoning for your choice. Determine the numerical values for your controller tuning parameters. 93 (PT (PC I/P よ。 91
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