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Control Systems Engineering, 3rd Edition by S. K. Bhattacharya

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5

Feedback Control System and Effect of Feedback on System Performance

5.1  OPEN-LOOP AND CLOSED-LOOP CONTROL SYSTEM

Introduction to control system and the concept of feedback was introduced in Chapter 1. In this chapter we are, once again, discussing the same topic in some more details.

A control system is formed by interconnecting various components to give a desired system response. An open-loop or non-feedback system (Fig. 5.1), with the help of a controller or actuating device, directly generates the output in response to an input.

Fig. 5.1

Fig. 5.1 Open-loop or non-feedback system

A closed-loop or feedback system (Fig. 5.2) generates the output ...

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