Presentation is loading. Please wait.

Presentation is loading. Please wait.

By Dr. Hong Zhang.  Octave ◦ ◦ Very Similar commands ◦ Can run most M-files.

Similar presentations


Presentation on theme: "By Dr. Hong Zhang.  Octave ◦ ◦ Very Similar commands ◦ Can run most M-files."— Presentation transcript:

1 By Dr. Hong Zhang

2

3  Octave ◦ ◦ Very Similar commands ◦ Can run most M-files ◦ No built-in Simulink package ◦ Pure command line

4  Scilab ◦ ◦ Some commands are different ◦ Built-in Xcos to clone Simulink ◦ Some Graphic interface

5 Given a transfer function a 2 s 2 + a 1 s + a 0 b 2 s 2 + b 1 s + b 0 We can define it in Matlab as num = [a 2, a 1, a 0 ]; den = [b 2, b 1, b 0 ]; sys = tf(num, den);

6  Unit step response step(sys)  Unit impulse response impulse(sys)  Arbitrary input response t = t start : t interval : t finish ; u = f(t); % u is a function of t, e.g. ramp is u=t; lsim(sys, u, t)

7  Just bring the output to a variable. E.g. y1 = step(sys); y2 = impule(sys); y3 = lsim(sys, u, t);  Then we can use the variable. E.g. plot(t,y1, t, y2) plot(t, u, t, y3)

8 [r, p, k] = residue(num, den); Where r: root p: pole k: constant If there are complex terms, we can add the two conjugate ones together to get a 2 nd order real term.

9 Click the Simulink icon in Matlab window Simulink library browserSimulink modeling window Matlab main window

10  Find, drag and drop following blocks to the window ◦ Simulink  Continuous  Transfer Function ◦ Sources  Step ◦ Sinks  Scope You will get Building Blocks Output Input Except sources and sinks, every block should have an input and an output.

11  Double click the Transfer function block. Change Numerator to [1], denominator to [1 3 2]

12  Link the blocks by drag the output to input  Double click Scope to show Scope window  Click Ctrl+T or Simulation  Start or button

13  Change the spring constant and damping ratio, then you can have different response. [1 2 12][1 2 1] Hint: Hit the binocular to auto-scale the plot.

14  Replace the source with a Sine wave with frequency =3 Hint: Double click the block name to change it.

15  Hint: ◦ Hold Ctrl and click to tap an output line ◦ Right click a block and select Format to flip or rotate a block

16 Rewrite as Assume m=2kg c=3NSec/m k=3N/m f(t)=1(t)N


Download ppt "By Dr. Hong Zhang.  Octave ◦ ◦ Very Similar commands ◦ Can run most M-files."

Similar presentations


Ads by Google