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Flexibility. An analog controller is difficult to modify or redesignonce implemented in hardware. A digital controller is
implemented in firmware or software, and its modification ispossible without a complete replacement of the originalcontroller. Furthermore, the structure of the digital controllerneed not follow one of the simple forms that are typically usedin analog control. More complex controller structures involve afew extra arithmetic operations and are easily realizable.
Speed. The speed of computer hardware has increasedexponentially since the 1980s. This increase in processingspeed has made it possible to sample and process controlsignals at very high speeds. Because the interval between
samples, the sampling period, can be made very small,digital controllers achieve performance that is essentially thesame as that based on continuous monitoring of the controlledvariable.
Cost. Although the prices of most goods and serviceshave steadily increased, the cost of digital circuitrycontinues to decrease. Advances in very large scaleintegration (VLSI) technology have made it possible tomanufacture better, faster, and more reliable integratedcircuits and to offer them to the consumer at a lower price.This has made the use of digital controllers moreeconomical even for small, low-cost applications.
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Computer Control of an aircraft turbojet engine
Control of a robotic manipulator
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Course: Digital Control
Instructor: Dr. Mojtaba Barkhorari Yazdi
Scope: Introduction to system analysisand controllersynthesisfor discrete time signals and systems, includingcontroller realizationwith microcontrollers.
Prerequisites: Signals and Systems, Linear ControlSystems, Modern Control systems
Homework: There will be on the average one homeworkset every two weeks. Homework should be an individualeffort. However, group discussion is strongly encouraged.
Project: The course project will involve the modeling,analysis, design and realistic simulation of a physicalsystem under digital control.
Exams: Quizzes, Final Exam
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References:
M. Sam Fadali and A. Visioli, Digital Control Engineering,Academic Press, Burlington, MA, 2012.
D. Ibrahim, Microcontroller Based Applied Digital Control ,Wiley, 1st edition, 2006.
K. Ogata, Digital Control Engineering, Prentice Hall,Englewood Cliffs, NJ, 1995.
G. F. Franklin, J. D. Powell, M.L. Workman, Digital Control
of Dynamic Systems, Addison-Wesley, Reading, MA,1998.
