EE 428
LINEAR CONTROL SYSTEMS ANALYSIS
FALL 2007
EE 428 Laboratory #3: ComputerAided Control System Analysis and Design
1
Objectives
The objectives of the third laboratory session is to show how to use the SIMULINK block diagram environment for
simulation.
2
SIMULINK
SIMULINK is a graphical user interface to MATLAB and provides a convenient means for representing and analyzing
signals and systems using block diagrams. For example, Figure 1 shows a SIMULINK representation of a system
represented by the transfer function
Y
(
s
)
F
(
s
)
=
P
(
s
)
Q
(
s
)
In order to compute the zerostate unitstep response of the system in Figure 1 using the SIMULINK environment,
follow the steps below.
P(s)
Q(s)
Transfer Fcn
t
To Workspace2
f
To Workspace1
y
To Workspace
Step
Clock
Figure 1: SIMULINK model of a system represented by the transfer function
H
(
s
)=
P
(
s
)
/Q
(
s
).
1. To start SIMULINK, type
simulink
at the MATLAB command prompt. After the
Library Browser
window
opens, select
new model
from the
fle
menu and a new window will appear. Within this window, you can
construct a block diagram representation of a system by clicking on the desired block in the Library Browser
Window and dragging it into your model. The SIMULINK model in Figure 1 contains six blocks.
2. Add a
Transfer Fcn
block by ±rst opening the
Continuous
block in the
Library Browser
window, then
click on and drag the
Transfer Fcn
block into your model window. The
Transfer Fcn
block represents the
system using the polynomials
P
(
s
) and
Q
(
s
) from the ODE description.
3. Specify the polynomials
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 Fall '07
 SCHIANO
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