Eigen Analysis Fails.

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Nero
Posts: 51
Joined: Wed Jun 22, 2005 2:19 am

Eigen Analysis Fails.

Post by Nero »

Ever since moving up to 1.7, I cant seem to perform an Eigen analysis. I have tried an extremely simple model, and when I try to get the eigen values, I get the following errors:

BandArpackSolver::Error in dgbtrf_
Warning FrequencyAlgo::solveCurrentStep() - the EigenSOE failed in solve().
EigenAnalysis::analyze() - algorithm failed

The command I am issuing is: [puts eigen 6] to attemt to get the first 6 eigen values. Any ideas?
silvia
Posts: 3909
Joined: Tue Jan 11, 2005 7:44 am
Location: Degenkolb Engineers
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Post by silvia »

please post the script.
also, you might need to add additional negligible masses to other dof's to help the eigensolver. but this would have given you a different error message, but worth trying.
Silvia Mazzoni, PhD
Structural Consultant
Degenkolb Engineers
235 Montgomery Street, Suite 500
San Francisco, CA. 94104
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