Transfer function G(s) with plot or data

Hi

I have data and a graph from this data.

How to do transfer function G (s) from a chart or data?

Somebody knows?

Answer 1

[krishna teja]

hi

you could use

np = 2; % number of poles
nz = 1; % number of zeros
exp_data = readmatrix('data.csv'); %read data
u = exp_data(:,1); % input data
y = exp_data(:,2); % output data
Ts = 0.01; % sampling time in seconds

data = iddata(y,u,Ts);

sys = tfest(data,np,nz)

in MATLAB for estimating transfer function from data

more details can be found here

tfest

iddata