How to obtain FRF if sampling frequency for INPUT and OUTPUT data is different?
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I am trying to compute FRF and then modal parameters using modalfrf and modalfit commands using data obtained from FE simulations. The load is applied for a certain time and then free response of structure is observed (as in case of impulse loading). Both sampling time and total time for load and response parameters (say displacment) are different. I can obtain FFT for these input and output separatey but can not get frequency response function as sampling time and total time is different. Is there any way to obtain FRF and modal parameters in such case?
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dpb
on 1 Feb 2021
You'll need to resample one or both to a corresponding time base.
This will introduce some error into the estimation; if the sampling rates aren't too markedly different it shouldn't be too bad.
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