Hello guys,
I'm trying to do a Random fatigue analysis thanks to Optistruct. So first of all, I know that 2017 version has its own module which does this kind of analysis, and I already did it.
I'm now trying to compare Optistruct results with a VBA code I did.
So here are the step I did:
- FRF and Random Subcases (with RANDPS, TABLED1 etc)
- I ask for STRESS PSDF .Peak files for X to Z1, X to Z2, Y to Z1, Y to Z2, XY to Z1 and XY to Z2
Here, I can already see the number of positive crossing (which allow me to calculate life). First Question, do I have to divide this number by 2PI?
My second question is, is it okay to create a derivated results on Hyperview, which does : RMS VELOCITY / (2*PI RMS DISPLACEMENT) in order to obtain the number of positive zero crossing directly on HyperView?
This whole zero crossing things is kind of getting me crazy, a lot of people use it but I do'nt really understand how it works.
(By the way, I can give you the files I have on my simple model if it is needed)
Thanks for your answers!
