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ECE4510/ECE5510, INTRODUCTION TO FEEDBACK CONTROL 1–2

Usually deﬁned in terms

of the system’s step re-

sponse, as we’ll see in

notes Chapter 3.

0.1

0.9

DEFINITION: Feedback is the process of measuring the controlled

variable (e.g.,temperature)andusingthatinformationtoinﬂuencethe

value of the controlled variable.

Feedback is not necessary for control. But, it is necessary to cater for

system

uncertainty, which is the principal role of feedback.

Control theory is tr uly a multi-disciplinary study that cuts across

boundaries of many disciplines.

• Math is the cornerstone of control theory.

• Electrical engineering is also an important building block, though

mostly from the aspect of signals and systems, and less from

circuits.

• Mechanical engineering is likewise an important fundamental,

chieﬂy from the standpoint of dynamic system behavior.

• Other important foundational elements come from: physics

(conservation of energy), thermodynamics (entropy), and other

scientiﬁc ﬁrst principles.

Control engineers bring value across a very wide array of industries:

• Automotive, aerospace, electronic, medical, ﬁnancial. . . (see

next page for a synopsis).

Lecture notes prepared by and copyright

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

1 2 3 4 5 6 7 ... 13 14

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