How can I optimize function output by tuning 3 input parameters?

19 次查看（过去 30 天）

显示更早的评论

Yossef Yossefi 2021-1-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/710823-how-can-i-optimize-function-output-by-tuning-3-input-parameters

评论： Bjorn Gustavsson 2021-1-7

在 MATLAB Online 中打开

I want to optimize a non-linear output (Pressures) by finding the best 3 input parameters (Kp,Kd,Ki).

An optimized output is a constrained output.

Attached an example for unconstrained output for the input (0.0001,0.0008,0.000002). Thats not optimized.

I have tried using fminimax. It did not go well because Preasures is a long scalar vector (1x300) while the input is 3 scalars.
I have tried using live editor optimization tool. It did not go well because I have 3 parameters to tune in order to find the best output.
Unfortunately I do not know the system transfer function so I can not use the tune controller.

Thanks in advance.

function [Pressures] = myFunc(Kp,Kd,Ki)
    for i = 1:500
        ...
    end
end

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Bjorn Gustavsson 2021-1-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/710823-how-can-i-optimize-function-output-by-tuning-3-input-parameters#answer_592743

在 MATLAB Online 中打开

You'll have to modify (at least for simplicity) your function to something like this:

function [Pressures] = myFunc(KpKdKi)
    Kp = KpKdKi(1);
    Kd = KpKdKi(2);
    Ki = KpKdKi(3);
    for i = 1:500
        ...
    end
end

Then you can use fminimax or some of the other optimization-functions. The important point is to combine all the input parameters into one array - that is the format the optimization-tools expect things to have.

HTH