Advanced Sim: how to specify only (+) buckling modes? (NX6)

[potrero]

NX6.0.1.5 MP1 Advanced Simulation

Is there a way to filter calculated modes so that only positive (or negative) modes are returned? Might this be an input parameter or user specified text etc?

Solver is NX Nastran.

 

[bojanv]

I'm not quite sure what do you mean by positive and negative modes?

 

[potrero]

Buckling modes can be positive or negative; oftentimes you are really only interested in one or the other.

 

[potrero]

Answer:

To limit the returned buckling modes, change the Buckling Method Mode Generation setting from Modes Only to Modes/Frequency. (Right-click on Subcase - Buckling Method under the buckling solution in Sim -> Edit Solution Step ...). Change the Lower Limit in the Frequency Range from 0 (default) to 1 or whatever you desire. Also, in the same settings dialoge, you can change the number of desired modes to be output.