Simulink Present

8/3/2019 Simulink Present

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Simulation in Simulink


Bruce A. Desmarais

Odum Institute for Research in Social Science

February 14, 2009

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Introduction

Welcome!

Who am I?

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Introduction

Welcome!

Who am I?

Bruce Desmarais; Red Sox Fan and PhD student in the UNC PoliSci Dept.

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Introduction

Welcome!

Who am I?


Extensive experience with matrix algebra, simulation and statistical

computing in Matlab and other software/languages

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Introduction

Welcome!

Who am I?




No formal training in the instruction of Matlab(comments/suggestions will be much appreciated)

What will we cover?

S S

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Introduction

Welcome!

Who am I?





What will we cover?

Basic System design and Simulation in Simulink

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Introduction

Welcome!

Who am I?





What will we cover?


Manipulation of Simulink Model files

Simulink Interface with Matlab


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Introduction

Welcome!

Who am I?





What will we cover?


Manipulation of Simulink Model files

Simulink Interface with Matlab

Examples


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Introduction

What is Simulink?


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Introduction

What is Simulink?

Graphical extension to MATLAB for modeling and simulationof systems; Similar to Winbugs


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Introduction

What is Simulink?


Systems drawn on screen as block diagrams


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Introduction

What is Simulink?



Integrated with MATLAB


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Introduction

What is Simulink?




Combines intuitive graphical-user interface with excellentspeed and storage capabilities


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Introduction

What is Simulink?




Combines intuitive graphical-user interface with excellentspeed and storage capabilities

Is free to you!! (or included in tuition; however you want tolook at it)


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Introduction

New Model...First Steps

Open Matlab


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Introduction


Open Matlab

Type simulink


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Introduction


Open Matlab

Type simulink

Simulink library browser pops up


I

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Introduction


Open Matlab

Type simulink


Start a new model file Crtl + N


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Introduction


Open Matlab

Type simulink



The blank file is where model will be built..save it


Introduction

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Introduction


Open Matlab

Type simulink



The blank file is where model will be built..save it

Libraries contain building blocks


Basics

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Basics

Blocks

Model is a collection of blocks connected by lines. There are anumber of different classes of blocks:


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Basics

Blocks


Sources: Used to generate signals


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Blocks



Sinks: Used to output


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s cs

Blocks




Discrete: Linear, discrete-time system elements (transfer-functions)


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Blocks





Nonlinear: Arbitrary nonlinear operators


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Blocks






Connections: Multiplex, Demultiplex


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Blocks








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Blocks







Blocks have input and output terminals indicated by wedges pointing

towards and away from the block respectively. Lines transmit signals

from input to output.


Basics

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Lets build our first model

Click on Source


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Click on Source

Drag the radnom box into the left of the model


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Click on Source


Produces a gaussian signal with set parameters.


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Click on Source



Return to library main, click on User Defined


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Click on Source




Drag the Matlab Fcn into the model


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Click on Source





Return to library main, click on Sinks


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Click on Source





Return to library main, click on SinksDrag Scope into the model, connect all


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Block Manipulation

Blocks have many sorts of parameters


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Block Manipulation


To set a block’s parameters, right-click on a block and select theparameters option

Simulation in SimulinkBasics

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Block Manipulation



Our gaussian signal has mean and variance and seed parameters.Right click and set them to 0.5 and 1.5 respectively, be sure to noteor set seed in rng’s


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Block Manipulation




The Matlab Function takes a function as a parameter with

vector-valued argument u . Lets set it to sin(u ) + 1.


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Block Manipulation





vector-valued argumentu

. Lets set it tosin

(u

) + 1.Time arguments tell blocks ‘when’ to act during a simulation


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Block Manipulation





vector-valued argumentu

. Lets set it tosin

(u

) + 1.Time arguments tell blocks ‘when’ to act during a simulation

The scope box


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A First Run


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A First Run

1 Open a useful monitor of the simulation by double clicking on

the scope box


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A First Run


the scope box2 Now lets run the simulation...


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A First Run



3 First set the simulation parameters typing Ctrl + E


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A First Run




4 Many options; lets set the time from 0 to 25


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A First Run




4 Many options; lets set the time from 0 to 25

5 Now click on Simulation, Start


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Output to Matlab


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Output to Matlab

1 We often want the simulation data in Matlab


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Output to Matlab


2 Go to the library main, click on sinks


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Output to Matlab



3 Drag simout into the model and connect before scope


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Output to Matlab




4 Right click and call the object output


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Output to Matlab




4 Right click and call the object output

5 Returns a matlab structure...run the sim and lets take a look


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Output More to Matlab


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1 Suppose we want to get the signal at different points in thesimulation


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2 Drag another simout onto the screen


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O M M

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3 Lets grab the original gaussian signal


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O M M

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4 Name the second simout output


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O M M

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4 Name the second simout output

5 Connect to the line between the signal and the function..run

the simulation


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Output to File


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Output to File

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Output to File

1 The best way to assure your simulated data is not lost is tosave it immediately


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Output to File

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Output to File


2 Go into sinks again and select a untitled.mat file.


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Output to File

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Output to File



3 Right click to set file extension...will write to workingdirectory if no extension is provided


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Output to File

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Output to File




4 The signal can be saved in different times along the modelpath


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Output to File

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Output to File




4 The signal can be saved in different times along the modelpath

5 Somewhat inconvenient, every time you want a new positionon the path, you need a new file.


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Using Data From Matlab Workspace I

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There are many reasons we could want to use data from thematlab workspace


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We may want to use data in memory rather than generate it


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We may want to use data in memory rather than generate it2 It may be useful to use real-world data in the model.


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3 It may be difficult to use specific generators/rng streams inthe simulation


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3 It may be difficult to use specific generators/rng streams inthe simulation

4 We could use the inputs/outputs of previous simulations asinputs to the current simulation


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Using Data From Matlab Workspace II

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All of the objects in the workspace are available


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1 First, lets put something in the workspace, issue the commandx = [1:100; rand(1,100)]’


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Creates a 100x2 matrix with the first column indicating thetime stamp


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3 Right Click and delete the random generator

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4 Now go to Sources and drag simin

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Right click on simin and tell it to use x


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5

Right click on simin and tell it to use x6 Now lets set the simulation time to 0-250 and run it


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5

Right click on simin and tell it to use x6 Now lets set the simulation time to 0-250 and run it

7 Notice anything odd?...extrapolation


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Scope Plot of Multiple Characteristics

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It is easy to visualize how things move together


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1 Go to search, enter mux


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2 This block concatenates multiple signals into larger

vector-valued signals


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vector-valued signals3 Drag to the graphic


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4 Connect the input and output to the two mux input wedges


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5 Run the simulation and observe


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6 Look at the Scope


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6 Look at the Scope7 Which is which? We need a legend.


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An Alternative Multiple Characteristic Plot

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It is easy to visualize how things move together..again


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1 Right click in model area and choose Signal & Scope manager


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2 Under viewers expand Simulink


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3

Double Click Scope


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3

Double Click Scope4 Right click on the scope and choose Edit Signal

Connections


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Connections

5 Select the inputs and outputs then close.


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3


Connections


6

Run the simulation and double click on the glasses


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3


Connections


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Run the simulation and double click on the glasses7 Now right click on the plot space and select legend to get a

legend

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