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...
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...
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.'
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.'
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...
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...
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...
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...
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.'
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...
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...
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.'
biofriend,
what about a positive pressure on the model after reversing element normals?
Regards,
Spirit
'Ability is 10% inspiration and 90% perspiration.'
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...
cavva78,
at this link
http://femci.gsfc.nasa.gov/random/index.html
you can find a brief yet complete tutorial on what you should know to perform Random Analysis with NASTRAN.
There is a lot of other interesting stuff on other subjects as well.
I hope it helps.
Regards
Spirit...
bkj789,
in my view, if these beams are to experience torsion greater than the cracking torsion loads, they are to be resized in order to whitstand these loads without cracking, or the structure's layout has to be revised. I wouldn't be comfortable with building a structure that is expected to...
Hi feajob.
In your installation directory, in a subdirectory called /conf, there should be a file called nast200x.rcf (x stands for your NASTRAN version). Test-edit it and add a line with your scratch directory complete path:
sdir=/your_complete_path_to.../scratch.
It should work.
Regards...
davidlandis,
you have the applied load and its time history. Why don't you directly apply it to your structure in ANSYS and perform a dynamic transient analysis? This would avoid you to make (at best, simplifying) assumptions on an equivalent load.
This is just my opinion anyway.
Regards...
y32k,
the RBE2 element forces the nodes connected to move only with a rigid body movement, with reference to the DOFs defined in the rigid element itself. If you look at the RBE2 definition, it is 'A rigid body connected to an arbitrary number of grid points', and a rigid body in rotation can...
