Can someone help me on how can I get second order plus time delay model from the input-output data.

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Saraswathi S
Saraswathi S 2021-7-29
评论： Francisco J. Triveno Vargas 2024-10-7
I have a set of input and output data of a process and I need to fit it into a second order plus time delay. I used the system identification app and imported the data and estimated using transfer function model. Here they asked about number of poles and zeros and input delay if any. But I have no idea about input or output delay. I just want to fit these data into SOPTD model.
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Francisco J. Triveno Vargas
Francisco J. Triveno Vargas 2024-10-7
HI, could be usefull
clear,
close all,
load steamdata ttsteam
head(ttsteam,4) % system in matlab
np = 2; % Poles number
nz = 2; % Zeros number
iodelay = 0.2; % delay
sysdef = tfest(ttsteam,np,nz); % identification without delay
% sysdef = tfest(z2,np,nz,iodelay); % identificaiton with delay
Regards
Francisco

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