Is it possible to use an FRD (Frequency Response Data) model in Simulink?

Hello,

I am using Simulink to develop models of a dynamic structural system, and wish to use FRD estimates of the structural response in my simulations. However, I am unclear as to whether or not it is possible to use FRD objects in Simulink.

Can anyone advise me one way or the other? This doesn't seem to be covered in the Simulink documentation.

Thanks,

Chris

Answer 1

[Arnaud Miege]

I'm afraid not. The way to do this would be with the LTI System block, but that only supports state-space, zero/pole/gain and transfer function LTI objects.

There are other ways in which you can incorporate frequency-domain estimated models in Simulink using the System Identification Toolbox. See this answer for more details.

HTH,

Arnaud

Answer 2

[Joan Vazquez]

This may work:

sys = frd(response, frequency, 'FrequencyUnit', 'Hz');
opt = tfestOptions('EnforceStability', true);
TF = tfest(sys, n, opt);

and then use a transfer function block

Answer 3

[Nils Schmidt]

I am facing the same challenge, but it looks like you either need the controls and/or the identification toolbox to do the job.

I'm looking forward to other suggestions.

Regards

Nils