Control Systems Course Overview

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ELEC3114 : Control Systems
Course convener: Dr. Branislav Hredzak, Room 204,
54895, b.hredzak@unsw.edu.au

Consultations: Students are encouraged to use the open
consultation hour rather than contact by email; students may seek
consultation with the course convener at other times by
appointment.
Contact hours: The course consists of:
• 3 hours of lectures per week,
• 1 hour of tutorial every two weeks
• 3 hours of laboratory every two weeks

Dr Branislav Hredzak
Control Systems Engineering, Fourth Edition by Norman S. Nise
Copyright © 2004 by John Wiley & Sons. All rights reserved.

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• Tutorials start in Week 4.
• Laboratory starts in Week 2.
• Consultation sessions start in Week 3.

Lectures
The lecture times will largely be used for formal lectures and
some will be used for short quizzes. The lectures will cover the
same topics as in the text book, so lecture notes will not be
distributed. It is your responsibility to make your own notes. You
are expected to attend the lectures and prepare yourself for them.


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Tutorials
You are expected to attend the tutorials and are expected to
attempt to solve given tutorial questions before attending the
tutorial.

Laboratories
The laboratory sessions will focus on your learning about the
equipment and what the control issues really are. You will be
expected to be competent in the lab by the end of the course. Most
laboratory sessions will be flexible in that you may work in
groups or individually, helping each other and consulting the
demonstrators to the extent you need. However, you will be tested
individually on what you have learned in the laboratory sessions.


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Assessment
There are three components of the assessment in this course:

Final examination (65%) - The final examination is a standard
closed-book three hours written examination. The examination
will test knowledge and understanding of all major aspects
covered in the course.

Laboratory test (15%) - A practical test will be run during the
laboratory time in weeks 12 and 13.

Quizzes (20%) – There will be two short quizzes conducted
during the lecture times in Week 5 (10%) and Week 10
(10%). You will be advised of exact timing.


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Note:
• Requests for lab exemptions must be submitted by the end of
Week 2. If the lab exemption is granted, then the exam
weightage will be increased by the lab test weightage (15%)

• If a student has a valid reason not to attend a quiz then the
exam weightage will be increased by the quiz weightage
(10%).

• Students who are unable to attend a lab session must arrange
for a make-up lab session with the lab demonstrator.


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Prescribed textbook

The following textbook is prescribed for the course:

N. S. Nise, Control Systems Engineering, John Wiley & Sons, 4th
Edition (5th Edition)

Students are strongly encouraged to purchase a copy of this book
as it provides coverage of the topics in the syllabus. Lecture notes
will not be handed out.


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Online resources

Some additional on-line resources relevant to the course:

Resource:

Blackboard http://lms-
blackboard.telt.unsw.edu.au/webapps/portal/frameset.jsp

book website http://www.wiley.com/college/nise
MATLAB http://www.mathworks.com
library resources http://info.library.unsw.edu.au/web/
services/teaching.html


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MATLAB

A CD containing Matlab may be borrowed overnight (against a
student card) from room EE G15A. For those students who do
not have their own computers, access to these two programs is
available in the undergraduate computer laboratory (EE G16).


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Course Schedule
Lectures

Week Topic(s)
1 Introduction, Modelling in the Frequency Domain
2 Modelling in the Frequency Domain
3 Modelling in the Time Domain
4 Time Response
5 Reduction of Multiple Subsystems
6 Stability
7 Steady-State Errors
8 Root Locus Techniques
9 Design via Root Locus
10 Frequency Response Techniques
11 Design via Frequency Response
12 Design via State Space


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Laboratory sessions
- will be flexible in that you may work in groups or individually,
helping each other and consulting the demonstrators to the extent
you need. However, you will be tested individually on what you
have learned in the laboratory sessions.

Lab schedule:
Laboratory 1 Week 2, 3 Assignments 1, 2, 3
Laboratory 2 Week 4, 5 Assignments 4, 5
Laboratory 6 Week 12, 13 Test


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Introduction

• Control system applications
• How you can benefit from studying control systems
The basic features and configurations of control
systems
• Analysis and design objectives
• The design process


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Introduction


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Introduction

• a control system provides an output or response for a
given input or stimulus

Simplified description of a control system


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Introduction

Advantages of Control Systems

1. Power amplification (a radar antenna)
2. Remote control (robots)
3. Convenience of input form (temperature control)
4. Compensation for disturbances


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Response Characteristics and System
Configurations


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Two major configurations of control systems:
• open loop - does not correct for disturbances and is commanded by the
input (eg toaster)

• closed loop - compensates for disturbances by measuring the output
response, feeding that measurement back through a feedback path, and
comparing that response to the input at the summing junction.


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Analysis and Design Objectives

• Control system responds to an input by
undergoing a transient response before reaching a
steady-state response

There are several major objectives of systems analysis and design:

1. producing the desired transient response
2. reducing steady-state error
3. achieving stability
4. robust design


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Stability

• Natural response is dependent only on the
system, not the input

• Forced response is dependent on the input.

In a control system, the natural response must:
(1) eventually approach zero, thus leaving only the forced
response, or (2) oscillate.


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Antenna Azimuth: An lntroduction to
Position Control Systems
• converts a position input command to a position output
response

Antenna azimuth position control system


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Antenna Azimuth


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Antenna Azimuth

Response of a position control system
showing effect of high and low
controller gain on the output response Dr Branislav Hredzak

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The Design Process

The control system design process


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The Design Process (Antenna Azimuth)

Step 1: Transform Requirements into a Physical System
• Requirements: desire to position the antenna from a remote
location; weight, dimensions of the system

• Design specifications: desired transient response, steady-
state accuracy


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Step 2: Draw a Functional Block Diagram


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Step 3: Create a Schematic


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Step 4: Develop a Mathematical Model (Block Diagram)

• Use physical laws, such as Kirchhoff's laws for electrical
networks and Newton's law for mechanical systems

• Mathematical models can be described using
1. Differential equations
2. Laplace transform
3. State-space representation


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Step 5: Reduce the Block Diagram
• In order to evaluate the system response we reduce the large system's
block diagram to a single block with a mathematical description that
represents the system from its input to its output

Equivalent block diagram for the antenna azimuth
position control system


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Step 6: Analyze and Design

• analyze the system to see if the response specifications and performance
requirements can be met by simple adjustments of system parameters

• if specifications cannot be met, the designer designs additional
hardware in order to achieve a desired performance


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Step 6: Analyze and Design
Test waveforms used in control systems


Control Systems Course Overview

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