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Hunting Peaks and Hollows

Valued Contributor II

So I have some experimental results that tell me that the FFT peaks are at 13 and 25. 

I set up a nice little structures model and run it through Pardiso (I know it is MKL) but I think this is a more Fortran.

I get my results from Pardiso as follows




which in this case runs into the problem that the model is axisymmetric and one ends up with multiple identical modes. 

If I slowly perturb the model -- I get 


more modes which is akin to the look of the real FFT - one has 8000 points in the FFT map -- it is easy to identify the FFT peaks - simple sort does it -- but anyone got any ideas for perturbing a model to seek the changed peaks as the FT changes - in this case the middle beam element is made thinner?

There are at least 10 variables that can change and each is a rv so it is interesting.


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