Problems with idnlgrey object simulation

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Pierangelo
Pierangelo 2013-2-15
Hi everyone,
I am trying to identify the parameters of a system using a non-linear greyBox object. My system is defined as a state-space and the estimation, run by means of 'pem' command, seems to give good results.
After the estimation process, I use the command 'compare' to have a look on the results with respect to the measured data, and this results good as well.
The problem appears when I simulate the greyBox object on Simulink. The outputs it gives are completely different from the ones given by 'compare', altough I use the same input data.
Why does it happen? Which outputs should I trust more?
Thank you very much.

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Arkadiy Turevskiy
Arkadiy Turevskiy 2013-2-15
编辑：Arkadiy Turevskiy 2013-2-15
This issue was addressed several times previously, here is a link to the earlier question that was answered alerady. You need to set the initial states correctly. Take a look at this function for doing that.
HTH.
Arkadiy

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