Wollo University

Kombolcha Institute of Technology

Department of Electrical and Computer Engineering
Course Title and Code: - Introduction to Control Systems [ECEg − 3132]
Target Group: - 3rd Year BSC Electrical and Computer Engineering Regular Students
Year and Semester: 2015 E.C. 2nd Semester
Name and contact of Instructors: - Amanuel Abbere{amanuel.abere@wu.edu.et}
Pre-requisites:- Signal and Systems Analysis

Course Objectives & Competences to be acquired

 Students will add to their knowledge-base in the fundamentals of Electrical Engineering modeling
and design.
 Students will develop basic skills of utilizing mathematical tools needed to analyze and design
classical linear dynamic control systems.
 Each student will get real-world experience in control systems problems, design and
implementation.
Course Contents
1. Chapter 1. Review of Laplace Transform
1.1. Complex variables and complex functions
1.2. Basic control signals
1.3. Laplace and Inverse Laplace transformation
1.4. Solving LTI differential equations.
2. Chapter 2. Introduction to Control Systems
2.1. Introduction (History of Control Systems, Definition of Automatic Control, Characteristics of
Automatic Control, Application areas of Automatic control systems)
2.2. Example of Control systems
2.3. Elements of a basic structure of control system
2.4. Types of control systems (Natural versus Manmade, Manual versus Automatic, Closed loop
versus open).
3. Chapter 3. Mathematical Modeling of Dynamic Systems
3.1. Introduction
3.2. Classical Mathematical modeling techniques of a dynamic system
3.2.1. Differential equation
3.2.2. Transfer function
3.2.3. Impulse response function
3.3. Mathematical models of electrical systems
3.4. Mathematical models of mechanical systems
3.5. Poles and zeros of a transfer functionWollo University
3.6. Diagrammatical representation mechanisms of a systems dynamic models
3.6.1. Block diagrams
3.6.2. Signal flow graphs
 3.7. Introduction about Automatic industrial controllers
3.8. Mathematical models of thermal and fluid systems (reading assignment)
Chapter 4. Time Domain (Transient and Steady State response) Analysis of Control systems
 Introduction
 Time domain transient response specification (design) parameters
 Analysis of first order systems
 Analysis of second order systems
 Introduction about Second order systems
 Unit step response of second order systems
 Transient response specification parameters of under-damped Second-Order
Systems
 Impulse response of second order systems (reading assignment )
 Analysis of higher order systems
 Stability of control systems
 Definition of stability
 Analysis of stability
By using the location of the pole in the complex plane
By using Routh’s stability criterion
 Effect of derivative and integral control actions on system performance
 Steady state errors in unity feedback control systems
 Feedback Characteristics of Control Systems
 Effect of feedback on overall gain
 Effect of feedback on system stability
 Effect of feedback on system sensitivity
 Effect of feedback on steady state error
 Effect of feedback on disturbance
Chapter 5. Root locus analysis
 Introduction
 Root locus plots for Negative feedback systems
 Root locus plot of Positive feedback systems
 Conditionally stable systems
Chapter 6. Frequency response Analysis
 Introduction
 Presenting Frequency-Response Characteristics in Graphical Forms
 Polar plot
 Nyquist plot
 Bode plot
 Nichols plot (Log-magnitude Versus phase plot)
 Nyquist stability criterion
Chapter 7. Control Systems Design by Root locus method
  Design considerations, Lead compensation, Lag compensation, Lead-lag compensation, parallel
compensation
Chapter 8. Control Systems Design by Frequency Response
 Introduction, Lead compensation, Lag compensation, Lead-lag compensation
Teaching & Learning Methods: - Lecture, tutorial and presentation.
Assessment/Evaluation: - Quiz’s and Assignments (30 %), Lab and project (40 %), Final exam (30%).
Literature:-
Text books:
 Katsuhiko Ogata: Modern Control Engineering (4th Edition), Prentice Hall; 4 edition (November
13, 2001).
References:
 Modern Control systems by Richard C. Dorf & Hobert . Bishope
 Control Systems Engineering by Norman S. Nise
 Automatic Control Systems by Kuo & Wiley
 Introduction to Control Engineering by Girma Mulisa
 Control System Engineering by I.J. Nagrath and Gopal
 Norman S. Nise: Control Systems Engineering, John Wiley & Sons; 4th Edition edition
Aug19,2003.
 Azzo and Houpis: Feedback Control system analysis and synthesis, 2002.