How to take feedback from a state for a MIMO design

Question

Shilp Dixit 2012-10-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/51522-how-to-take-feedback-from-a-state-for-a-mimo-design

评论： Mr. NailGuy 2017-10-28

采纳的回答： Arkadiy Turevskiy

Hi,

How can i create a control system model with feedback taken from state instead of output i.e. State Feedback?

I have 4 states, 2 inputs and 2 outputs.

Feedback from state 2,x(2) and state 4, x(4) to be used to create input function for u(2) = fs. u(1) does not depend on state.
I have another concern. While creating the state space model i had my input vector as a 2 X N matrix. However while using a lsim function I had to provide input in the form N X 2. Is there something deeply wrong with my approach?...

Code and document in the links below.

http://sdrv.ms/X0IJVR (Document)

http://pastebin.com/1UEgD5KU (Code)

Thanks for all the help...

Regards

Shilp

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Answer 1

Arkadiy Turevskiy 2012-10-22

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https://ww2.mathworks.cn/matlabcentral/answers/51522-how-to-take-feedback-from-a-state-for-a-mimo-design#answer_62851

You can add 2 more rows to your C and D matrices:

for C: [0 1 0 0;

0 0 0 1];

for D: [0 0;

0 0];

This would give you 4 outputs and 2 inputs, with outputs 3 and 4 being your states 2 and 4.

Arkadiy

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Shilp Dixit 2012-10-23

Thank you very much for the help.

I am still a bit confused about the explanation of matrix C and D. 1. Do I create another pseudo system with states as input and my dependent input as the output.

OR

1. Modify my current matrix C and D to accommodate the control signal.

How can I achieve the same result by working on transfer functions?

Mr. NailGuy 2017-10-28

If I want to get the step response of the output of the system instead of the state variables and plot it using Simulink, how can I get it? Same as this problem posted, I was able to feedback the state to the system but when I check the output of the system it shows the graph of my state instead of my output. Can you help me on this?

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