MISO State-space Model

RZ
2011 4 25
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Hi, I have a state-space model with 1 input and 1 output that works just fine. I want to change one of the constants in that model to an input, which is to be determined by a controller. I have the model in state-space and i have it modelled in SIMULINK. I know how to change it in SIMULINK but I don't know how to change the state-space model. Help is very much appreciated :)

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Arnaud Miege
Arnaud Miege 2011-4-26

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I assume that you are using the State-Space block. You'll need to reconstruct your state-space model using basic Simulink blocks. Have a look at the following:
HTH,
Arnaud

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RZ
RZ 2011-4-26
Hi Arnaud,
Thanks for your reply. I used exactly that technique. I replaced a gain block which represented the damping coefficient with an input and product block so I can enter the damping coefficient manually, or control it using some form of a controller I would design later. However, when I try to convert the system into a state-space block using the "linmod" function in matlab, it doesn't work. It gives me the state-space matrices, and when I use them in the state-space block in SIMULINK I get a wrong output. It seems that the model is taking only the first input and assuming the 2nd is zero. But the model still requires 2 inputs or it gives me an error. Is it possible to send you the files so you can check them for yourself?
Thanks alot for your help.
Arnaud Miege
Arnaud Miege 2011-4-26
Could you upload the files on a filesharing site instead? Then, they're accessible to the rest of the community.

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RZ
RZ
2011-4-25

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