Includes bibliographical references and index. ISBN ( hardback). 1. Digital control systems. I. Visioli, Antonio. II. Title. TJM53F33 PDF | Digital control is a branch of control theory that uses digital computers to act as system controllers. Depending on the requirements. Digital Control System. Analysis and Design. Third Edition. CHARLES L. PHILLIPS. Department of Electrical Engineering. Auburn University. H. TROY NAGLE.
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Digital Control Systems is a revised translation of Commande des systèmes: The closed loop control systems studied in this book are. ELG Digital Control Systems. Discrete Equivalents. Z-Transform. Stability Criteria. Steady State Error. Design of Digital Control Systems. 1. Introduction to Digital Control, Lecture 1, Lecture 1, 57 kb. Introduction Design of sampled data control systems, Lecture15, Controller types, 78 kb. Design of.
Topics covered include:. A number of recent methodological developments in control design and system identification, driven by applications, are presented, including:.
Measurement and Instrumentation, Second Edition: Theory and Application
The text of Digital Control Systems is enhanced, for practical and tutorial purposes, by the use of software which illustrates the various concepts and algorithms and gives a feeling for the phenomena, discussed. The book also provides practising engineers wishing to enhance their skills in this area with efficient and co-ordinated methods for the design and implementation of computer-based controllers.
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Authors Ioan D. Continuous Control Systems: A Review.
Pages Computer Control Systems. Robust Digital Controller Design Methods. System Identification: The Bases.
System Identification Methods. In order for a digital computer to accomplish these tasks, the differential equations describing compensation must be approximated by reducing them to algebraic equations involving addition, division, and multiplication. Since the computer receives data only at specific intervals, it is necessary to develop a method for describing and analyzing the performance of computer control systems.
This signal has a range of amplitude, and a range of frequencies that can present. This continuously varying electrical signal may then be converted to a sequence of digital values, called samples, by some analog to digital conversion circuit.
If the input is a vector, all elements of the vector are held for the same sample period.
For slow-to-fast transitions, use the unit delay block. It plays a similar role to the one the Laplace transform does in the continuous time domain. The z-transform opens up new ways of solving problems and designing discrete domain applications.
The z- transform converts a discrete time domain signal, which is a sequence of real numbers, into a complex frequency domain representation. Accordingly the imaginary axis of the s-plane corresponds to the unit circle in the z-plane, and the inside of the unit circle corresponds to the left half of the s-plane.
A sampled system is stable if all the poles of the closed-loop transfer function T z lie within the unit circle of the z-plane.
The sinusoid is a unique input signal, and the resulting output signal for a linear system, as well as signals throughout the system, is sinusoidal in the steady-state; it differs form the input waveform only in amplitude and phase. A bode plot of a phase-lead compensator looks like the following Phase-Lead Compensator Using Frequency Response Additional positive phase increases the phase margin and thus increases the stability of the system.
This type of compensator is designed by determining alfa from the amount of phase needed to satisfy the phase margin requirements. Another effect of the lead compensator can be seen in the magnitude plot.
The lead compensator increases the gain of the system at high frequencies the amount of this gain is equal to alfa.
This can increase the crossover frequency, which will help to decrease the rise time and settling time of the system. A phase-lag compensator tends to shift the root locus to the right, which is undesirable.Click here to sign up. We will attempt to design Gc s so that we achieve s 0.
If the input is a vector, all elements of the vector are held for the same sample period. A bode plot of a phase-lead compensator looks like the following Phase-Lead Compensator Using Frequency Response Additional positive phase increases the phase margin and thus increases the stability of the system. The overshoot is 0. Teaches the fundamentals of digital control, enabling the student to exploit the complete potential of digital systems.
Design of a digital compensator Let us design a compensator D z that will result in a stable system when G p s is as described in Example This continuously varying electrical signal may then be converted to a sequence of digital values, called samples, by some analog to digital conversion circuit.
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