How to do Feedback Loop on Simulink with different frequinces

Question

Esin Derin 2022-6-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1746895-how-to-do-feedback-loop-on-simulink-with-different-frequinces

评论： Paul 2022-6-24

Ekran Resmi 2022-06-23 22.33.47.png

Hello, I'm trying to build a Simulink for a open and closed loop. I have to put harmonic input signal (instead of step) with amplitude 3. Input the signal into closed and open system. And found the amplitude of the output signal for both systems. Then I have to change the signal frequency 0.1 Hz to 100 Hz with increasing step ( 0.1Hz, 0.2 Hz, 0.4 Hz .... )

Attached here, you can find my diagram.

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Answer 1

Sam Chak 2022-6-24

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https://ww2.mathworks.cn/matlabcentral/answers/1746895-how-to-do-feedback-loop-on-simulink-with-different-frequinces#answer_992225

编辑：Sam Chak 2022-6-24

Hi @Esin Derin

First, you need to construct the frequency {0.1, 0.2, 0.4, 0.8, 1.6, ...} based on the following sequence that depends on the integer variable

, which is constructed using a summation of Step functions. Note that mathematically, the sequence won't arrive exactly at 100 Hz, but 102.4 Hz.

Next, construct the Input Sine wave with varying sequential frequency.

The overall system looks like this. The step times of the 11 Step function blocks are implied in the Block names.

Then, run the simulation and plot the outputs.

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Esin Derin 2022-6-24

Thank you:)

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Answer 2

Paul 2022-6-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1746895-how-to-do-feedback-loop-on-simulink-with-different-frequinces#answer_992285

在 MATLAB Online 中打开

I'm assuming the question is how to run the same simulation multiple times for different frequencies. With this assumption ....

1. Replace the block labeled Sine Wave Function with the Sine Wave block

2. Double click the Sine Wave block, set the Amplitude parameter to 3, set the Frequency parameter to: freqHz*2*pi (enter it exactly that way).

3. In the Matlab workspace, or in a script, implement

freqvec = [0.1 0.2 0.4]; % choose whatever frequencies are needed
for ii = 1:numel(freqvec)
    freqHz = freqvec(ii);
    out = sim('Esin'); % use the actual name of the .slx file
    % do whatever processing is needed on out
end