How to use Power Spectral density block in Simulink?

Question

Vineeth Ravulapalli 2020-4-22

1
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https://ww2.mathworks.cn/matlabcentral/answers/519751-how-to-use-power-spectral-density-block-in-simulink

回答： Priyanshu Mishra 2020-4-28

Hello there,

I would like to plot a PSD of a signal that's generated in Simulink, and for this purpose, I thought of using the "Power Spectral Density " block that's avaible in the "Additional Sinks" of the Simulink Library. But, I am unable to understand the definitions of the block paramters. My Signal has a lenght of 1000001 data points with a time resolution (Δt) of 7.32e-07. So, kindly help me understand what these parameters mean.

Thanks and regards

Vineeth R

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Answer 1

Priyanshu Mishra 2020-4-28

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/519751-how-to-use-power-spectral-density-block-in-simulink#answer_428950

Hi Vineeth,

Power Spectral Density block displays the frequency content of the buffer in graph window. The block calculates the power spectral analysis using ffts.

It stores buffer of output and input points then plots the power spectral density.
You may define number of points to be used for calculating fft.
You may define how often you want to plot the fft
Fourth parameter is the sampling time.

A similar question is also asked in the community earlier. You may refer the following link for further explanation.

https://www.mathworks.com/matlabcentral/answers/89942-how-to-plot-the-frequency-spectrum-in-simulink