Process Control Systems Episode 7 ppsx
Process Control Systems Episode 7 ppsx
... its
control systems ought never to interfere with this aspiration.
Multivariable Process Control
I
1 97
FIG 7. 7. The effect of m2 on
cl
de-
pends on the ratio of their periods.
Equation (7. 20) ... expanded in Chap. 7,
Multivariable Process Control.
But the deepest penetration into the
194
1
Multiple-loop Systems
component blending system be as follows:
am
-I-
bm
(7....
Process Control Systems Episode 2 pps
... Feedback Control
Since
72
= 2,
n2
+ n
4+2
3
zz-=
2 2
and
3:
= (2.618)(0.382) = 1.00
With three capacities of time constant
7,
Tl
-
= 5.0503
7
72
-
= 0.6403
i-
73 .
-
=
0.3090
7
G.0000
and ... con-
tribution of
71
is 45”. This occurs where
70
=
2 ~7~ .
Here 135” of phase
FIG 1.25. Zntegral control of dead
time (aboue) is the same as propor-
tional control of a dea...
Process Control Systems Episode 4 ppt
... 0
125
-36
P
127r&,
158
220
361
llOTd/T,
1 27
196
22%,/T,
254
540
Process
70
Gain
4.OOsd
0.64rd/r,
4.80 0 .76
6.00
0.95
8.00 1. 27
-__
3.197d
0.5 17& amp;1
4.00 0.64
5. 37 0.86
2.867d
0.45rJn
4.00 ... by
Process
I
1
ml -7- 7gg+
Controller ,
FIG 4.10. The complementary
controller has a model of the process
in its positive feedback loop.
L l
Linear Controllers 99
I
loop. For...
Process Control Systems Episode 6 pot
... than
one control loop.
CASCADE CONTROL
The output of one controller may be used to manipulate the set point
of another. The two controllers are then said to be cascaded, one upon
the other. Each controller ... prime variable.
Secondary
Controller
Primary
controller
FIG 6.1. Cascade control resolves the process
into two parts, each within a closed loop.
156 1 Multiple-loop Systems
Th...
Process Control Systems Episode 8 doc
... Manipulated
variable
-
c
*
Process
Controlled
variable
*
I
I
FIG 8.1. The control system embodies a for-
ward flow of information.
Feedforward Control
I
223
MzY
FIG 8. 17. The complete control
system for ... given in Eq. (7. 16).
Feedforward Control
I
PO7
feedforward system to force the process to respond as it was designed-
to follow the set points as directed without regard to...
Process Control Systems Episode 9 pps
... The control system for
once-through boiler must be as
closely knit as the process itself.
Control of Energy Transfer
h
P
a
Set boint
to
combustion-
:ontrol
system
Set point
to
feedwater
flow controller
match ... the significance
of the design procedures that follow will be lost.
Alany
processes can
tolerate poorly designed control systems, particularly if they are protected
from a...
Process Control Systems Episode 12 pdf
... 206.2”F.
lo.2
TT
=
-3
min;
70
= 4.8 min; P = 71 %.
The loop is marginally stable.
10.3
71 9
= -7. 8 min;
70
= 4.3 min; P = 72 %. For the second calculation,
TT
=
+lO
min;
70
= 3.9 min; P = 65%.
342
... similarity to the control equation for distillation-but in this
350
[
Appendix
Chapter
P
9.1
Noninteracting:
7,
=
2 47,
G,
= 0.60. Interacting:
7,
= 3 37,
G...
Process Control Systems Episode 13 docx
... decoupling systems, 199
in feedforward systems, 219
Acids, ionization of, 275 - 277
Adaptation in feedforward-feedback
systems, 223, 224
Adaptive control, 170 - 179
dividers in, 176 , 177
dynamic, 171 - 174 , ... 171 - 174 , 223
feedforward, 175 , 223-2 27
programmed, 172
self-adaptive, 173 , 176 - 179
steady-state, 174 - 179 , 225-2 27
Adiabatic drying, 344, 345
ex
Adjusting contr...
Automotive Quality Systems Handbook Episode 7 ppsx
... members of the review panel being independent.
Design control 2 57
auto204.qxd 10/04/00 21:33 Page 2 57
Design procedures (4.4.1)
Procedures to control the design (4.4.1)
The standard requires the ... a process of choosing solutions from avail-
able technologies. You may require two types of design control procedures, standards,
and guides: those for controlling all designs and thos...
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