How to add measured frequency response function to Simulink as a transfer function block?
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I have a set of frequency response data gathered by modal analysis, which are stored in format (frequency, Re, Im) like the following. The frequency resolution is 0.5 Hz and measured field is up to 200 Hz. Can I put this measured Gxx list as a transfer function block in a simulink model?
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/887715/image.png)
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Answers (2)
Benjamin Thompson
on 8 Feb 2022
Yes, Simulink has transfer function blocks. You will need to select transfer function coefficients that match your response curves well enough. There are a few apps in the Control System Toolbox that may help with that process.
Benjamin Thompson
on 10 Feb 2022
See the System Identification Toolbox documentation article "Frequency-Response Models", maybe the spa function.
Also if you Google the topic "transfer function estimation from bode plot" you will find many resources including YouTube videos, as this is usualy a first year controls class topic. Transitions in the slope and level of the plots correpond to roots in the transfer function equation.
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