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Types of Feedback Control Systems



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Types of Feedback Control Systems
by B. Kuo & F. Golnaraghi

Feedback control systems may be classified in a number of ways, depending upon the purpose of the classification. For instance, according to the method of analysis and design, control systems are classified as linear or nonlinear, and time-varying or time-invariant. According to the types of signal found in the system, reference is often made to continuous-data or discrete-data systems, and modulated or unmodulated systems. Control systems are often classified according to the main purpose of the system. For instance, a position-control system and a velocity-control system control the output variables just as the names imply. In a particular case, the type of control system is defined according to the form of the open-loop transfer function. In general, there are many other ways of identifying control systems according to some special features of the system. It is important to know some of the more common ways of classifying control systems before embarking on the analysis and design of these systems.


Kuo, B., Golnaraghi, F. Automatic Control Systems. – 9th Ed. – Wiley, 2010. – 944 p. (P. 11).




18. Make a sentence out of the two parts:

  1. Feedback –




  1. Driver –

3) Transducer –

a) a defect in a circuit, which prevents the current from following the intended course.


b) an electromagnetic device controlling a larger current or activating other devices in the same or another electric circuit.
c) an instrument for measuring, comparing or controlling electric voltage.

  1. Potentiometer-

5) Relay –


6) Detector –


7) Amplifier –
8) Regulator –

9) Fault –


10 Assembly -


d) a device used to increase the strength of an electric signal.
e) any machine part that communicates motion to another part.
f) any device that transmits energy from one system to another or converts the energy in form.
g) a mechanism for controlling the movement of machinery, the flow of liquids, gases, electricity, steam, etc.
h) an apparatus for indicating the presence of smth., as electric waves.
i) a fitting together of parts to make the whole.

j) a transfer of [part of the output of an active circuit or device back to the inpu





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