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  • Users: dfanfan
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  1. dfanfan

    Rank Deficient

    I am running an extensive FEMAP model and I keep getting the following errors: *** USER WARNING MESSAGE 6137 (UDSNRD) INPUT MATRIX IS RANK DEFICIENT, RANK = 12720 IERROR USER ACTION: CHECK MODEL User information: One of your matrices is singular. See the NX NASTRAN...
  2. dfanfan

    MWFRS vs C&C

    I have a weather/sound enclosure for a piece of rooftop equipment that I am running a finite element model for 150 mph winds (Miami-Dade). The enclosure is 25 ft by 9 ft in plan and stands about 10 ft high. (Attached is a picture of my NASTRAN model) It is made of 5052 H32 aluminum and I am...

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