Programatically changing block parameter during simulation.

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Janez
Janez 2012-8-23
I am automatically changing the amplitude value of my sin wave block in my model. But the problem is that my program runs the simulation multiple times and do not change the values of amplitude during one simulation. this is the code:
amplitude_vec=(0.5:0.2:2.3);
for i=1:10
amplitude=amplitude_vec(i);
sim('Amplifier.mdl');
end;
How do i write a program that will change the values of amplitude of my sin wave block in one simulation run ?
Thanks for your help,
Janez
  2 个评论
TAB
TAB 2012-8-23
编辑：TAB 2012-8-23
"my program runs the simulation multiple times and do not change the values of amplitude during one simulation"...??? Confusing line.
You have never changed any block parameter value in existing code.
Janez
Janez 2012-8-23
编辑：Janez 2012-8-23
yes i did.
Here : amplitude=amplitude_vec(i);
This changes the amplitude parameter of the sine wave. I placed variable 'amplitude' in that block.
This changes the amplitude of the sine wave for every simulation. Which means that my program runs ten simulation each with different sine wave amplitude. Believe me, i have run it.
But i want it to happen in one simulation for different time intervals in that simulation.

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2012-8-25
编辑：Azzi Abdelmalek 2012-8-26
amplitude_vec=(0.5:0.2:2.3);
for k=1:10
amplitude=amplitude_vec(k);
set_param('Amplifier/Sine Wave','Amplitude',num2str(amplitude))
%check if "Sine Wave" is the name of your sine block, if not, replace it
sim('Amplifier');
end;
or you can use (you don't need to pause simulation)
  1. the below code allows to create a signal with multiple amplitude saved in "file.mat"
  2. you set sine amplitude to 1
amplitude_vec=(0.5:0.2:2.3);
t0=0;tf=5;te=0.1;
tf1=tf;t=[];amp=[];
for k=1:length(amplitude_vec)
t1=t0:te:tf;
t=[t t1 ];
amp=[ amp amplitude_vec(k)*ones(1,length(t1))];
t0=tf+te;tf=t0+tf1
end
close;plot(t,amp);
ty=[t;amp];
save file ty

更多回答（1 个）

Mariano Lizarraga
Mariano Lizarraga 2012-8-25
编辑：Mariano Lizarraga 2012-8-25
I might be misunderstanding your problem statement but if you only want to change the amplitude base on the time of the simualtion then you could do an embedded matlab function as follows:
function y = timeDependentSine(t, amplitude, freq, phase, bias)
y = amplitude*sin(freq*t + phase) + bias;
and now all the parameters for the sine function can be time varying if you so desire. You can implement all in Simulink as shown here: http://skit.ch/nwn1

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