MATLAB: Is there a blank zone at the start of the simulink simulation

simulinktime zero

I am quite new to Simulink and am trying a simple RL circuit to test it out. When I try to run the simulation for say 10 sec, in my scope (the output) the signal is blank (not zero just blank) for first 8 seconds and then there is the signal. If I change the total simulation time to say 5, the blank area is around 1 sec.

Is this inherent problem of Simulink, or am I doing something wrong?

NB: A colleague suggested that the blank time is the time Simulink is trying to solve the problem and after solving, it starts to show the results. I haven't seen any other simulation software that cannot give an output at time 0.0.

Best Answer

Probably in your Scope block, you have a parameter checked. Go to Settings->Logging and uncheck Limit data points to last parameter then rerun the simulation.

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Hi,

My guess is that you forget to change your simulation parameters.

In the toolbar :

Simulation -> Model Configuration Parameters.

change the solver to fixed-step, and put a small sample time to force Simulink to simulate at a desired rate.

MATLAB: Zone identification on curve

Try this:

D = load('identification.mat');
var = D.var;
x = 0:numel(var)-1;
varfilt = sgolayfilt(var, 5, 271);
Lmx = find(islocalmax(varfilt, 'MinSeparation',900));
Lmn = find(islocalmin(varfilt, 'MinSeparation',900));
figure
plot(x, var)
hold on
% plot(x, varfilt)
for k = 1:numel(Lmn)
    idxrng = Lmn(k):Lmx(k);
    plot(x(idxrng), var(Lmn(k):Lmx(k)),'-r', 'LineWidth',2)
end
% plot(x(Lmx), var(Lmx), '^r')
% plot(x(Lmn), var(Lmn), 'vr')
hold off
grid

producing this plot:

That is likely as good as it is possible to get. I left other graphics calls in the code (commented-out) so if you un-comment them, you can see how the code works in more detail.

Best Answer

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MATLAB: OBSERVING SIGNAL GENERATOR OUTPUT AT HIGH FREQUENCY IN SIMULINK

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