Process Control Systems Episode 12 pdf

... 182 Pairing Controlled and Manipulated Variables 188 Decoupling Control Systems 198 Summary 202 References 202 Problems 203 8. Feedforward Control 204 The Control System as a Model of the Process 206’ Applying ... 228 Problems 228 APPLICATIONS 9. Control of Energy Transfer 233 Heat Transfer 23.4 Combustion Control 241 Steam-plant Control Systems 243 Pumps and Compresso...

Ngày tải lên: 01/04/2014, 11:09

... + − + − + − − − + ⎛⎞ −− + −+ ΦΘ+ − + ⎜⎟ ⎜⎟ ⎝⎠ +−−+Φ    () () 1 33 3 3 11 1 33 3 33 3 des,0 22 3 3 3 33 3 01 1 33 33 3 1 3 1 1 ˆ ˆˆ trace trace ˆ trace ii ii i TT T F TT T T T T FF B B i FFF ... ref 3 [] T Xpqr= with the angular rates 3 X . Defining the tracking errors des 33 3 ZXX=− (32 ) and taking the derivatives results in () () ( ) () des 33 3 3 3 3...

Ngày tải lên: 19/06/2014, 23:20

Ngày tải lên: 27/06/2014, 05:20

... gain at 70 = 2. 5~~ be 1.0: G(+!!=lO 1 2 P . Substituting for the dynamic gains of ~~ and 72, Substituting 2. 5~~ for TV, 2. 5 ~2 2. 5 ~2 P = 100 ~ ~ 2TTl 2lrr2 r=1s; (1 .25 ) This is the ... Fig. 2. 1. As a 40 1 Understanding Feedback Control Since 72 = 2, n2 + n 4 +2 3 zz-= 2 2 and 3: = (2. 618)(0.3 82) = 1.00 With three capacities of time constant 7, T...

Ngày tải lên: 12/08/2014, 16:21

... 0 125 -36 P 127r&, 158 220 361 llOTd/T, 127 196 22%,/T, 2 54 540 Process 70 Gain 4. OOsd 0.64rd/r, 4. 80 0.76 6.00 0.95 8.00 1.27 -__ 3.197d 0.517&1 4. 00 0. 64 5.37 0.86 2.867d 0 .45 rJn 4. 00 0. 64 6.79 1.08 Perform- ance, PR/100 m 4 .52sd2/rl 3.65 4. 58 0.9772/71 0.81 0.96 2. ... 0.86 Interacting three-mode _- ? 1 , D 0 0 0 0 __- 0,907d 0. 64 0. 54 ,Controller R...

Ngày tải lên: 12/08/2014, 16:21

... prime variable. Secondary Controller Primary controller FIG 6. 1. Cascade control resolves the process into two parts, each within a closed loop. 1 56 1 Multiple-loop Systems The vector gain of ... constant gain for the primary loop. RATIO CONTROL SYSTEMS In a ratio control system, the true controlled variable is the ratio K of two measured variables X and Y: K=; (6. 3) Contr...

Ngày tải lên: 12/08/2014, 16:21

... 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 (...

Ngày tải lên: 12/08/2014, 16:21

... 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 ... Appara- tus, British Patent No. 86 0, 485 , February 8, 1961. 3. MacMullan, E. C., and F. G. Shinskey: Feedforward Analog Computer Control of a Superfractionator, Cont...

Ngày tải lên: 12/08/2014, 16:21

... WCCC/WHCH) (9. 11) (9. 12) To envision what effect flow rates have upon exit temperature, Eg. (9. 11) is plot’ted in Fig. 9. 4 with the same abscissa and parameter that were used in Fig. 9. 3. FIG 9. 4. ... with Eq. (9. 11) yields: THI - THZ 1 THI - TCI = CH/AkH -k 96 ãk ( WHCH/WCCC)(CC/A~C -k 35) (9. 13) A plot of Eq. (9. 13) for conditions of CH/AkH = Cc/Akc = 1 is given...

Ngày tải lên: 12/08/2014, 16:21

... balance: V(1 - y) = F(l - 2) (12. 7) The combination of Eqs. (12. 5) through (12. 7) permit’s solution for the value of the manipulated variable L required to control either y or 2, the other ... -Y) (12. 8) n’otice the resemblance of Eq. (12. 8) to t’he feedforward control equat’ion for binary distillation. As in distillation, there is a relationship between y and Z, of...

Ngày tải lên: 12/08/2014, 16:21

... 124 on-off, 131 with differential gap, 132 in dual-mode systems, 137 -141 limit cycle due to, 131 with proportional time, 133 , 134 with reset and derivative, 135 three-state, 134 , 135 peak-seeking, ... 278 discontinuous, 149 for pH control, 279 dual-mode, 136 -144 on-off, 131 with differential gap, 132 proportional time, 133 , 134 three-state, 134 , 135 Nonlinear...

Ngày tải lên: 12/08/2014, 16:21

... of parameters. Figure 9.15 Display unit. (Reproduced courtesy Litton Marine Systems. ) 344 Electronic Navigation Systems 9.9 Glossary Adaptive autopilot One in which all the control signals ... omnidirectional antenna system. 342 Electronic Navigation Systems Table 9.3 Sperry ADG 3000 VT fault codes and corrective action chart. (Reproduced courtesy of Litton Marine Systems)...

Ngày tải lên: 13/08/2014, 16:21

... 200 203 2 05 213 213 214 2 15 217 218 222 226 230 232 234 2 35 236 240 243 2 45 253 253 253 253 256 7.2.1.2 Physicists, Chemists and Metallurgists Cooperate 259 7.2.1.3 ... 43 1 432 433 436 438 439 444 446 448 449 449 45 1 452 454 456 456 4 65 4 65 468 469 47 1 473 474 474 4 75 4 75 478 48 1 482 Contents Dedic...

Ngày tải lên: 13/08/2014, 17:20