[System Identification] Estimate and validate transfer function

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Ivan Teng
Ivan Teng 2024-5-24
评论： Mathieu NOE 2024-5-24
Hi!
There are 4 sets of data in the attached mat file:
  • Data_estimate_dry
  • Data_validate_dry
  • Data_estimate_wet
  • Data_validate_wet
Note that for the wet, the output data (y1) decreases at a much faster rate than the dry.
I used the following to estimate the transfer function based on dry set of data:
Opt = tfestOptions('Display','on');
mtf = tfest(Data_estimate_dry, 2,2,13,Opt);
Used another set to check the fit:
figure, compare(Data_validate_dry,mtf)
The resulting fit looks good with 88% fit.
Then I used wet data to run it through the estimated transfer function:
figure, compare(Data_validate_wet,mtf)
As expected, the fit is not good. However, during the decay phase, I expected to see a big different between simulated data and the wet data.
Is this due to different input signals for wet and dry data?

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