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Topic: StateSpace in simulink
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Justin A

Posts: 52
Registered: 12/7/04
StateSpace in simulink
Posted: Sep 20, 2007 1:25 PM
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Hi folks,

I have a simple - maybe stupid - question !?

I have used the system identification toolbox to identify a
statespace-model with multiple inputs and a single output
(MISO). I now want to use this ss-model in simulink ....

The model is a continuous model with sampletime = 1, I use
the workspace model's parameters (model.A, model.B etc.) in
my simulink statespace-block, set simulation configurations
to fixedstepsize=1 (ODE5) and reconstruct my input vector
according to the one I used for identification with a mux
block ..... but simulation doesn't work, the output diverges ...

I'm not that much of a simulink user, but the model itself
is not unstable when I use it with matlab (sim, step,
compare etc.) .....
What am I doing wrong, do I have to regard something about
the configuration parameters, stepsizes, do I have to choose
another block (discrete statespace ??) ... ?? I'm a little
confused now, should be possible to use the model in
simulink, so it must be a simple mistake ..... but I don't
get it ... Glad if someone could help ...

Andreas




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