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ADINA - Eigenvalue problem

ADINA - Eigenvalue problem

ADINA - Eigenvalue problem

(OP)
I am doing an linearized buckling analysis using ADINA for a column-type structure. For the same model of the structure, with the same load, I am do two analysis. In the first analysis I ask two modes and 15 modes in the second. The results are different.

My question is what is the resason of this difference?

RE: ADINA - Eigenvalue problem

You need to explain some more.  Were modes 1 and 2 not the same in both?  They should be.  Beyond mode 2 you've got nothing to compare to.

Does your software allow a shift? This could be different between your two models.  It's really hard to say without seeing the model.

Please post some more info and I'll try and help some more. (If I remember, my forgetter is working pretty good.)

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