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An Introduction to Simulink

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Title: Simulink Starting Info Author: pattichis Last modified by: pattichis Created Date: 12/21/2006 8:05:52 PM Document presentation format: On-screen Show – PowerPoint PPT presentation

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Title: An Introduction to Simulink


1
An Introduction to Simulink
  • Marios S. Pattichis

2
Configuration Parameters
  • Simulink is designed to be a front-end tool for
  • integrating ordinary differential equations
  • (ODEs). So, you need to keep sampling
  • issues in mind
  • Experiment with the ODE Solver parameters to
    make things appear correctly.

3
Setting the Configuration Parameters
  • To start
  • 1. Click on the Simulink icon to open up
  • Simulink in Matlab.
  • 2. In the new model window, click on the
  • configuration parameters.

4
Starting and Ending Time Parameters
  • Simulation time
  • Start time 0.0 End time 100
  • Note that these times come from the Sources
  • parameters. Keep in mind that the Sources are
  • usually designed for continuous-time (not
    discrete
  • time) simulations.

5
Solver Configuration Parameters
  • Solver Options
  • Type Variable-step
  • Solver discrete (no continuous-states)
  • Max Step Size 0.5 lt- Set lower for better
    simulations!
  • Or
  • Type Fixed-step
  • Solver discrete (no continuous-states)
  • Fixed Step Size (fundamental sample size)
    0.5
  • Set lower Fixed Step Size for better
    simulations!
  • The rest are not as important

6
Connecting Things
  • 1. Hold down the Control key down.
  • 2. Click on the source icon.
  • 3. Click on the sink icon.
  • 4. Press the left mouse key to make the
  • connection.

7
Displaying Things
  • Can use the scope attached to any signal.
  • Use the Autoscale function that appears as
    binoculars in order to look at the results of the
    entire simulations
  • Click on the X, the Y or the zoom functions
    to look at any specific part of the simulation

8
Documenting Your Work
  • Use Alt PrntScrn to capture a window of
    your work
  • Then, in Word, simple use Paste to get the
    window of your simulation

9
A Simple Example Displaying a Chirp Signal in
Simulink
The Model -gt
10
Chirp Parameters
Thus, the correct display should show a slowly
varying sinusoid that is speeding up. From the
source parameters Start time 0 End time
100
11
Configuration Parameters
Notice the Fixed-step size of 0.1.
12
After Running the Simulation
After clicking on Autoscale, it all appears to
be working.
13
Aliasing Due to Insufficient Sampling
After changing the Fixed-step size to 1 ...
TOO LARGE!
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