How to get transfer function (approximation) of unknown system in matlab/simulink? -



How to get transfer function (approximation) of unknown system in matlab/simulink? -

i have unknown scheme in simulink model (non-linear) , dont know how tf describe in interval of input data. im sorry im asking such abstract question im lost.

i tried 'tfest(data,number_of_poles,number_of_zeroes)' tried 'ident' , import input , output ident gui , click estimate tf. both returned me transfer function behave completly different system.

im not sure input should generate system, should imput noise? appreciate kind of advice or help here.

if have simulink command design, can utilize frequency response estimation functionality or linearise simulink model around operating point.

you need provide more info (data, code, etc...) why tfest , ident didn't work. there lot of different models , options available within scheme identifcation gui, may matter of choosing right one.

matlab simulink system-identification

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