ELE 639 Lecture Notes - Lecture 4: Step Response, Settling Time, Rise Time
10 Apr 2016
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Document Summary
Recall that the implicit control objective is to ensure that the closed loop system is stable. Once that is achieved, the explicit control objective is to force the process output to follow, or track, a desired reference signal, even in presence of an unexpected, and unwanted, disturbance. The reference signal may be constant, in which case we refer to the control system as the regulator system, or varying, in which case we refer to the control system as the tracking system. A special case of regulation is when the constant reference signal is equal to zero. In regulation, the most important objective is to effectively reject disturbances. In case of tracking, the accuracy, or quality, of the response (i. e. how close the output is to the reference) is important both in the steady state and in transient. Examples of signals - steps, ramps, sinusoids, parabolic, and any arbitrary time varying signals.
