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Frequency Response values FREQi

User: "Nathan_22110"
Nathan_22110
Altair Community Member
Updated by Nathan_22110

Dear Altair community,

 

I just want to be sure about something in FRF FREQi specified values. I know that when you are doing a Frequency Response Analysis, then you are computing the structure's response at the frequency points specified in FREQi cards. But if I use the computed FRF in a Random Response Analysis which basically multiply the square of this FRF by a (PSD) input, then I know that if a computed value of the FRF (let's say for f=10) which is not a specified value in the PSD, then it will be computed either with linear or logarithmic interpolation. But on the contrary, if a PSD point is specified at f=10 whereas f=10 is not a specified value of the FRF specified in the FREQi card, then will it be just ignored? Only specified frequency values in FREQi are used, so if a point on the Input PSD does not line up with a point on the Transfer Function, that Input PSD point is ignored in the Response PSD calculation? Or is it interpolated too? I have found nothing about it in OptiStruct help.

 

Thank you :)/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' />

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