Simulink: Sine wave generation. Configuration problem.

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ANUBHAV SINHA
ANUBHAV SINHA 2011-2-6
评论： yassine amine 2018-3-24
Hi, While using Simulink, I simply connect a 'sine wave generator' (picked from Simulink>>Sources) to the scope and set the frequency at 100*pi rad/s.
However, on running the simulation, I get a randomly increasing waveform and not a sinusoidal signal of above freq. However, if I set a frequcny such as 1 rad/s, a perfect sine wave is obtained.
I think I must choose a 'continuous' scale to run it and right now maybe a 'discrete scale' is chosen with large step size. May someone suggest a possible remedy?
Thanks.
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yassine amine
yassine amine 2018-3-24
exempel: tried with time=10s , Amplitude=200 , Frequency=100*pi , sample time=0.00001 it gives you a better result

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Guy Rouleau
Guy Rouleau 2011-2-6
By default, the Simulink solver chooses the time steps using:
dt = (t_stop-t_start)/50
With the default parameters, it gives 50 Hz, or a period of 0.02. this is why you do not see the 100rad/s sine way proprerly... Nyquist criteria and aliasing!
I made the following blog post exactly on this topic:
http://blogs.mathworks.com/seth/2009/07/14/refining-the-output-of-a-simulation/
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