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ECE4510/ECE5510, INTRODUCTION TO FEEDBACK CONTROL 1–6

The control problem/solution methodology

Now that we have identiﬁed the main components of a feedback

control system, we consider the problem that a control system is

designed to solve, and the methodology for solution.

The objectives of any control-system design include:

• “Reject” disturbance (plant response to disturbance input

minimized).

• Acceptable steady state errors (response after a “long” time).

• Acceptable transient response (short-term dynamics).

• Minimize sensitivity to plant parameter changes (“robustness”).

Solutions are reached via the methodology:

1. Choosing output sensors.

2. Choosing actuators.

*3. Developing plant, actuator, sensor equations (models).

*4. Designing compensator based on the models and design criteria.

*5. Evaluating design analytically, with simulation and prototype.

*6. Iteration!! (In part because actual system will be different from

model.)

Steps 1 and 2 are sometimes out of our purview. Our focus in this

course is on steps 3–6.

In the next section, we will look at a lengthy example of these six

steps.

Lecture notes prepared by and copyright

! 1998–2013, Gregory L. Plett and M. Scott Trimboli

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APC UCCS Temperature Control Manual de usuario Pagina 6