random vibration environment analysis
random vibration environment analysis
(OP)
Hello everyone,
could anyone plase tell me what is the correct procedure to perform a structural analysis by FEA on an item subjucted to random vibration? I work in aerospace field and use NX.Nastran with Femap. I know the input PSD for this item and I would like to verify its strength. It includes some welded connections also: how are they usually modelled?
Thanks and regards
could anyone plase tell me what is the correct procedure to perform a structural analysis by FEA on an item subjucted to random vibration? I work in aerospace field and use NX.Nastran with Femap. I know the input PSD for this item and I would like to verify its strength. It includes some welded connections also: how are they usually modelled?
Thanks and regards





RE: random vibration environment analysis
Garland E. Borowski, PE
Engineering Manager
Star Aviation
RE: random vibration environment analysis
The NX documentation should be able to give you all the information you need about setting up and running the models?
RE: random vibration environment analysis
I don't use NX but Nastran with Femap as pre-post, with the licence for dynamic analysis. I am able to perform freq response and to apply PSD, but I would like to know how to consider the results, since I can have PSD of component stresses, and not Von Mises. Is there any standard procedure?
RE: random vibration environment analysis
I know NASTRAN is capable of calculating the RMS VonMises Stress. I can also get X-Y plots of the PSD of VonMises stresses for an individual element.