Page 905 - Mechanical Engineers' Handbook (Volume 2)

Index 897

Phase shift distortion (PSD), 206, 207 in z-domain, 532, 535–539
Phase-variable form, converting I/O to, Pole placement design method, 758–763
321 advantages of, 760
Phase variables, 371 constant reference/disturbance inputs
Phenolic adhesives, 77 modification, 761–763
Physical variables, 303, 304 regulation problem, 758–761
PI control, see Proportional-integral Pole–zero cancellation, 337, 528, 529
control Policy capture, 283
PID control, see Proportional-integral- Policy iteration, 815
derivative control Policy (planning) modeling, 275
PID controllers, 656, 658–666 Polyimide adhesives, 77
frequency compensation equivalence, Poorly damped systems, 637–644
656, 658–659 Popov’s method, 441
generalized, 658 Position control systems, 386–387
systems with inherent integration, 660– Position error coefficient (c ), 389
0
666 Position feedback, 543
systems with no inherent integration, Positioning controllers, 701
659, 660 Position sensors, 853–855
Pistons, 575 Postprocessors, 706
Piston servomotors, 575–578 Potentials, 38
Plant (term), 388 Potentiometers, 386, 389, 390, 494, 853
Plant control hierarchy, 679 Pound, 116
Plant equations, 318 Power, 303, 304
Platinum resistance thermometer, 157 for electrohydraulic servosystems, 614–
PLCs, see Programmable logic controllers 616
PM, see Phase margin as term, 828
PM motors, see Permanent-magnet motors Power amplifiers, 670, 672
Pneumatic actuators, 396–399 Power drain, 120
Pneumatic controllers, 407 Power exchange:
Point-by-point approximation, 19, 20 as input–output interaction example, 34
Point objects, 66 operating points in a, 46–48
Point-to-point numerical controllers, 701 Power spectrum, 363, 378
Poisson probability, 30 Power systems, 444
Polar plots, 343 Precision, 5, 10, 117, 213–214
for common transfer functions, 345, Precision indexes (W ), 10–12
x
347, 349 Predictive (forecasting) modeling, 275
definition of, 339 Predictor–corrector methods, 357
as design tool in frequency domain, Prefilters, 651–654
506–509 lag, 651–652
and stability, 481 lead, 652–654
Poles: Preliminary conceptual design phase
complex, 325–326 (system design), 289–290
effects of additional, 474–475, 477 Preparatory functions (G-codes), 702
of F(s), 324 Pressure drop, 61
and impulse responses, 470–471 Pressure feedback servovalves, 611, 613,
repeated, 325 614
in z-plane, 461 Prewarping, 202
Pole locations: Primary physical variables, 303, 304
and impulse responses, 532, 533 Primary transfer function, 388