Saturation function in Simulink

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Peppe
Peppe 2017-7-14
回答： Endrias 2019-1-21
Hi, I would like to implement following block in simulink. How do I do it in Simulink: U = u_d - K/b * sat(σ /θ)
where: sat(σ/θ) = {1 if σ>θ, σ/θ if −θ ≤ σ ≤ θ, −1, σ < −θ}
u_d is input, K and b are constant. If possible even a matlab function would be appritiated.

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回答（2 个）

Sruthi Geetha
Sruthi Geetha 2017-7-17
In Simulink, you can implement this using If block and If action subsystem block. In the If block you can specify the number of inputs, If, elseif and else conditions. Connect three If action subsystems to each condition and generate the outputs as 1, sigma/theta and -1 for each of the conditions. You can also do this using a simple code in MATLAB Fcn block:
if sigma>theta
out = 1;
elseif (sigma>=-theta)&&(sigma<=theta)
out = sigma/theta;
else
out = -1;
end
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Leigh Boyd
Leigh Boyd 2017-8-11
did you ever get an answer to this? I have a similar problrm
Peppe
Peppe 2017-8-27
I did it manually in a matlab function. not by using any blocks.

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Endrias
Endrias 2019-1-21
Simulink have a nice IF expression block which you can program the sat(.) function without any matlab written code. If anybody interested to see the block code, let me know.

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