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Recent content by Spirit

  1. Spirit

    Problems with Rotor

    Supituki, I assume you must also have NASTRAN installed on your WS. So, when you are in the 'Analysis' menu in PATRAN, choose the 'Analysis Deck' option instead of 'Full Run'. This should produce the appropriate .bdf file without running it. At this point, you can open the .bdf, edit it...
  2. Spirit

    Problems with Rotor

    Supituki, the problem is indeed not in the number value, but in the number itself. The current syntax for the RSPINR card for the NASTRAN2008 version is: RSPINR ROTORID GRIDA GRIDB SPDUNT SPDINT For versions up to 2005 it was indeed: RSPINR ROTORID GRIDA GRIDB GR...
  3. Spirit

    Problems with Rotor

    Supituki, try to rewrite your card like: RSPINR 1 1 21 RPM 300. This should be the correct sintax, I assume numbers are correct. Regards, Spirit 'Ability is 10% inspiration and 90% perspiration.'
  4. Spirit

    Panel Flutter

    http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19640000491_1964000491.pdf Typewritten documents still have some beauty :-) . Regards Spirit 'Ability is 10% inspiration and 90% perspiration.'
  5. Spirit

    How to view a slice

    Hello Adam I think you could find very useful the utilities collected in the 'Insight' menu of PATRAN. You should first create some isosurfaces based on coordinates (your 'slices') and then plot a stress result map onto these isosurfaces. You can also make the isos move across the...
  6. Spirit

    Notch, Special case of stress distribution

    sartorbjk, two remarks: 1) you are working with an orthotropic material; 2) you are analysing the MAX principal stress. I expect that if you do the same run on an isotropic material and check the Von Mises stress you should obtain what you are indeed expecting (max stress at the...
  7. Spirit

    Nastran Punch Files for Stiffness Matrix

    Hello feajob, the PAX matrix indeed refers to the reduced matrix of loads. I don't know the exact meaning of the VAX part, I read somewhere that it should be related to the rigid mody motion of your model (not sure though). I usually erase it happily from my reduced structures...
  8. Spirit

    Nastran Punch Files for Stiffness Matrix

    Hello feajob, what you should do is run a file where the GRIDs for which you require the stiffness values are defined via the ASET card: ASET1 123456 GRID1 GRID2 ... GRIDn and add in the parameter section of the same file the line PARAM,EXTOUT,DMIGPCH It should give...
  9. Spirit

    Duplicate grid error

    neema1984, I would say that you are using twice the same node to define a triangular element. Just a guess based on what you posted. Regards, Spirit 'Ability is 10% inspiration and 90% perspiration.'
  10. Spirit

    Design Optimization - Sol 200

    Hello Guisouza, I've done some work on it, so feel free to share. Regards, Spirit 'Ability is 10% inspiration and 90% perspiration.'
  11. Spirit

    large mass method

    Plzzhelp, the Large Mass Method is the standard procedure to apply accelerations for NASTRAN previous to 2001 release; from this version, a more robust method has been implemented that does not require the large mass and allows the excitation via forced displacements, velocities or...
  12. Spirit

    Using Output(plot) Set Command

    Hi flambter, try to modify your Case Control as follows: SUBCASE 1 TITLE=3G_Up SUBTITLE=3G_Up SET 200 = QUAD4 SPC = 2 LOAD = 3 SPCFORCES(SORT1,REAL)=ALL FORCE(SORT1,PRINT,PLOT,REAL,BILIN)=200 the PRINT command sets the output on the .f06 file, the PLOT to the binary (.op2...
  13. Spirit

    Modelling a Pin-Jointed Truss - Patran/Nastran

    Hello ferryscott, assuming you are using CBAR elements, you can activate the pin release flags on the CBAR card. These are to be defined in the fields 12 and 13: putting "456" in these fields should fit your needs. Regards, Spirit 'Ability is 10% inspiration and 90% perspiration.'
  14. Spirit

    How to introduce a negative pressure in a pipe in ABAQUS?

    biofriend, what about a positive pressure on the model after reversing element normals? Regards, Spirit 'Ability is 10% inspiration and 90% perspiration.'
  15. Spirit

    Maximize the first resonance frequency of a plate.

    vidiii, considering the shape of the mode of interest and the constraints you mentioned, I would suggest you to consider a plate with a C-shaped border frame; if this is not enough, I would also evaluate adding two diagonal ribs. I think this is a tradeoff solution between the starting...
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