lab01 simulink tutorial

8/12/2019 Lab01 Simulink Tutorial

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Getting started with Simulink

An introductory tutorial

Wireless LANsDepartment of Telecommunication Systems and Networks

Technological Education Institute of Messolonghi

F. Plessas 2012


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Launch Matlab

Start All Programs Matlab 7.0


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Launch Simulink (1/2)

In theMATLAB

window,

at the >>prompt, type

simulinkand pressEnter


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Launch Simulink (2/2)


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Create a new model

Click the new-modelicon in the upper leftcorner to start a new

mu n e Select the Simulink

icon to obtain

elements of themodel


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Your workspace

Library of elements Model is created in this window


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Save your model

You might create a new folder, like the oneshown below, called simulink_files

Use the .mdl suffix when savin


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Example 1: a simple model

Build a Simulink model that solves thedifferential equation

=&

Initial condition x(0) = -1.

First, sketch a simulation diagram of

this mathematical model (equation)


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Simulation diagram

Input is the forcing function 3sin(2t) Output is the solution of the differential

e uation x t 1)0( =x

Now build this model in Simulink

xx&

s

13sin(2t)

(input)

x(t)

(output)

integrator


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Select an input block

Drag a Sine Waveblockfrom the Sourceslibraryto the model window


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Select an operator block

Drag an Integratorblockfrom the Continuouslibraryto the model window


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Select an output block

Drag a Scopeblock from theSinkslibrary to the model


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Connect blocks with signals

Place your cursor onthe output port (>) ofthe Sine Waveblock

Drag from the SineWaveoutput to theIntegratorinput

Drag from theIntegratoroutput tothe Scopeinput Arrows indicate the

direction of the signal flow.


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Select simulation parameters

Double-click onthe Sine Waveblock to set

amplitude = 3and freq = 2.

This produces thedesired input of3sin(2t)


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Double-click onthe Integrator

initial condition= -1.

This sets our ICx(0) = -1.


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Double-click onthe Scopeto view

results


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Run the simulation

In the modelwindow, from the

-

down menu,select Start

View the outputx(t) in the Scope

window.


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Simulation results

To verify that this plotrepresents the solution tothe problem, solve the

.

The analytical result,

x(t)=1/2 (3/2)cos(2t)

matches the plot (thesimulation result) exactly.


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Example 2

Constructing and simulating a simple circuitmodel:


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Create the simulation diagram


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Constructing and simulating asimple circuit model


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Notes

Simulink blocks have zero, one or more inputs andzero, one or more outputs

Inputs and outputs are all considered signals

Unlike circuit-oriented simulators (e.g. Spice),Simulink has no knowledge of whether a signal isvoltage, current, power, torque, speed, , which

makes it a very general tool for simulations of various dynamicalsystems, but

requires a user to decide which signals are inputs and which signalsare outputs, and make block connections to correctly model system

equations; as a result, Simulink block diagrams may not be asintuitive as circuit diagrams


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End of tutorial

lab01 simulink tutorial

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