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Random response analysis with NX.Nastran 5

Random response analysis with NX.Nastran 5

Random response analysis with NX.Nastran 5

(OP)
Hello,
I'm looking for someone expert in random response analysis for help, since Nastran
and Femap guides are not very explicative. I try to list some doubts:

-I apply an acceleration load on 4 nodes with a PSD input (in g^2/Hz) with a model
in SI units. When I ask as output acceleration I expect to get again g^2/Hz, right?
And for displacements, forces and stresses which units do I get?

-Is it possible in some way to have a Von Mises stress as output from a random analysis?

-I was asked to calculate differential displacement output between 2 nodes as PSD
by random analysis: is there any way to do that? Is it possible to simply subtract
2 PSD displacement curves (taking absolute value)?

Thanks a lot, and any reference to tutorials or guides is helpful.

Marco

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