Transcription of SECTION 19
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SECTION 19
CONTROL SYSTEMSC ontrol is used to modify the behavior of a system so it behaves in a specific desirable way over time. Forexample, we may want the speed of a car on the highway to remain as close as possible to 60 miles per hourin spite of possible hills or adverse wind; or we may want an aircraft to follow a desired altitude, heading,and velocity profile independent of wind gusts; or we may want the temperature and pressure in a reactorvessel in a chemical process plant to be maintained at desired levels. All these are being accomplished todayby control methods and the above are examples of what automatic control systems are designed to do,without human intervention. Control is used whenever quantities such as speed, altitude, temperature, orvoltage must be made to behave in some desirable way over SECTION provides an introduction to control system design methods.
system (ABS), emission control, and tracking control. The use of feedback control preceded control theory, outlined in the following sections, by over 2000 years. The first feedback device on record is the famous Water Clock of Ktesibios in Alexandria, Egypt, from the third century BC. Proportional-Integral-Derivative Control
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