What means SYSTEM FATAL MESSAGE 5407 (LNCCKS) ?

Currently running Nastran2017,1.0 SOL111 with Acoustic Cavity and ACMS Version=0ld. The Eigenmodes for structure were solved. But "SYSTEM FATAL MESSAGE 5407 (LNCCKS)

INERTIA (STURM SEQUENCE) COUNT DISAGREES WITH THE NUMBER OF MODES ACTUALLY COMPUTED IN A (PARTIAL) INTERVAL

FOUND 448 MODES BETWEEN -1.0000000E+00 HZ AND 1.2000000E+03 HZ BUT THERE SHOULD BE ONLY 438 MODES." occurs.

Does anybody know what this means ?

0 Hrishikesh Phadke over 5 years ago

I would try to confirm that the model runs without ACMS first. If the model runs without ACMS, then this is something specific to ACMS issue.

If the model also fails with Lanczos then try to identify the modeling issue. Run SOL 103 on the structural model and fluid model seperately to identify the problem being specific to structural model or fluid model.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel