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Fundamental Objectives 5 Study Questions and Problems
Dead Time Lag 14 Study Questions and Problems 15 References
Complex Numbers 17 Basic Concepts of the Frequency Response
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15 psig actual assumed block diagram Bode plot calculated cascade control Chapter characteristic chart circuit closed loop components constant contacts on line control loop control system control valve controlled variable controller gain controller output curve cycle damping dead time lag defined determine dynamics element and transmitter energized equal example exponential lag feedback feedforward first-order flow rate heat exchanger incomplete response increase initial overpeak input signal Laplace transform linear load changes loop frequency response loop gain measured variable measuring element obtained offset open loop operating period phase angle PI controller pressure drop problem procedure Process Control product flow proportional controller proportional plus reset psig range span rate control reader reduced reference or set relay reset controller result sensing element set point change shown in Figure sine wave solution spring-mass system start-up steady-state steam flow step input STEP RESPONSE tank technique temperature tion transfer function transmission line vector