problem in designing state feedback controller

I derived a model that is a Mimo model with 3 inputs and one output. I wanted to design a state feedback controller to control only one of the input because the others are constants that cannot be physically controlled. The approach I addressed is finding the transfer function of the desired control input to the output. Then I convert the system to state space so it turns to be siso system. Is my approach correct?

Thank you

Answer 1

[Azzi Abdelmalek]

You can consider your model as SISO with two disturbance signals. Set those two constant signal to 0 and find the transfer function, and convert it to whatever you want (state space representation, or others)

[Abdulaziz AlKuwari]

Thank you :)