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Sigma Value in Random vibration simulation (1, 2 and 3 sigma inputs?)

Creator
Creator

Hello,

 

I would like to give Sigma value in the Random Vibration Simulation as it is a probabilistic value,

 

If not possible to give, what will be the intial sigma value is considering by the software?

 

Thank You.

2 REPLIES

Re: Sigma Value in Random vibration simulation (1, 2 and 3 sigma inputs?)

Legend
Legend

NX Nastran will calculate RMS vlaues.  Force, acceleration and displacements are easy, 3-sigma = 3xRMS...  For stress, we use a Seaglman approach to compute 3-sigma from RMS...

Re: Sigma Value in Random vibration simulation (1, 2 and 3 sigma inputs?)

Creator
Creator

Thanks for solution.

 

I would like to view that sigma value in results, for highligting that in presentation.

 

How can I view that?