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  1. dfanfan

    Rank Deficient

    Thanks rb1957
  2. dfanfan

    Rank Deficient

    Yes, this error was pasted from the f06 file. Just to give you a little background information, I am taking a solid model and created midsurfaces on all the parts. I meshed all the midsurfaces and connected the panels with rigid elements. The model is about 30 thousand nodes and 30 thousand...
  3. dfanfan

    Rank Deficient

    PLEASE HELP ANYONE!
  4. dfanfan

    Rank Deficient

    I take that back. It didn't work. Same error but now the rank = 13848
  5. dfanfan

    Rank Deficient

    I figured it out everyone. My model was not fully connected therefore, producing singularities. Thanks for all your help.
  6. 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...
  7. dfanfan

    MWFRS vs C&C

    JAE: Figure 6.5.12.1.3 says "Tributary" Areas Greater than 700 ft^2. I thought tributary area referred to only the first surface to hit normal to the wind direction. Others: How do we account for the suction elements on the leeward face? A Ph. D at Berkeley agrees with me that MWFRS is the way...
  8. 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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