how to vary parameters in Simulink

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Gabriel Oliviero 2016-3-30

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评论： Fred Tabash 2022-5-7

Hello, I have the attached system and I would like to vary the frequency of the AC source, to make a frequency sweep. Can anyone help with that?

Thank you.

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Muhammed Fasil 2016-3-31

Near RUN(green) button , there is a left side directed button. Click on that and enter a time in that Pause block. So when simulation reaches that time, it pauses. At that time u manually change input frequency

Gabriel Oliviero 2016-4-1

when you press pause during the simulation, the parameters of the blocks are blocked and you can't change.

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Answer 1

Sebastian Castro 2016-3-31

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Do you mean changing frequency during simulation, or being able to run multiple simulations with different frequencies each?

If you want to change frequency during simulation, you can change the input with a Controlled Voltage Source block and pass in a Sine wave of varying frequency into this block.
If you want to change frequency between simulations, you can set the AC Voltage Source's frequency to a MATLAB variable and change the value of the variable between simulations. This lends itself well for scripting, too.

Also, what is your end goal? Simulink Control Design has a way to automatically perform frequency response estimation and get an experimental Bode plot.

- Sebastian

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Sebastian Castro 2016-4-6

I see... did you see this new video on sensitivity analysis in R2016a?

http://www.mathworks.com/videos/design-exploration-using-the-sensitivity-analysis-tool-118699.html

Fred Tabash 2022-5-7

Greetings, Sebastian...

In fact, I did see the video and am practicing on it right now...

however, I have a problem when I want to build a physical model, such as a circuit with diodes, resistors, capacitors, and so on...

My goal is to perform sensitivity analysis and Monte Carlo simulation... but I can't find these parameters in the App sensitivity analysis. Would you mind if I asked how I could specify the parameter as a variable for the app to be able to select and analyze it?

I appreciate your help.

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