I find the .log file can give a number of dofs of a model, and the number of total dofs is six times of the number of nodes. Is the node in different type element has a same number of dofs? In my opinion, the node in solid element only have three translation…
In General, how to validate the Dynamic Analysis results. (i.e.) We used to check Reaction forces for linear static Analysis.
If AUTOSPC is used in Analysis, how to validate the results in Dynamic analysis.
I am batch running nastran and occasionally get a string of failed runs due to this:
*** USER FATAL MESSAGE 3060 (PREFACE)
- AUTHORIZATION ERROR ***
UNABLE TO OBTAIN LICENSES FOR Nastran Solver
PLEASE REFER TO THE LOG FILE FOR…
I'm running SOL 112 using enforced motion. I'm getting 1000x higher displacement and stresses than what I'm expecting. I think, whatever input I’m giving, solver is not applying exactly same input. After analysis, I can see the FEA output is scaled by…
Hello
I have a model that I am checking for any errors. I ran a free-free modal analysis. Instead of getting 6 rigid body modes (zero), I am getting the first 3 modes as 0 while, the other 3 (rotational) are not perfectly zero. It has a value of…
When I run a solution sequence based on BCTABL1, BCONECT, BCBODYs, BCPROPs Cards, the correct gap is detected for Default Offset (Z0=-t/2), but any non-Default Offsets are completely ignored by the algorithm. Is there any solution to take the Offset…
I've built an Apex model with multiple analysis scenarios. Each scenario has about 9 load case events and each scenario is exported to its own bdf for solving in Nastran. After building and exporting, we decided we did not want to run through all the…
I'm a big fan of NASTRAN's ability to supply results in as HDF5 file, but occasionally I find it difficult to determine where to find the results I'm interested in. Currently I load the file into PATRAN to reverse engineer things that aren't clear, but…
I have a model that becomes much, much slower to run when I enable strength ratio calculation (PARAM,SRCOMPS,YES), and I think it might be related to writing the data to *.fo6. It's a relative large model (100s of sub cases, ~50,000 elments, 100s of plies…
Howdy,
First time posting here, please be nice :)
It is my understanding that the calculation of residual vectors is triggered in a variety of ways (loads, inertial, rvdof, etc). Assuming that is true is there a way determine the…
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…
I have modeled 1D cantilevered beam using "CBEAM" ( general section / standard formulation) and applied torque at its free end but the results show no stresses or deformation. Similarly when I used "ROD" ( general section / standard formulation) element…
Currently there some memory problems when I run Nastran 2017.1 with AMC (Version = New) If I run with (Version =Old) the job will be OK.
Are there any advices to avoid memory problems ?
BR Thomas Roy
Using the NASTRAN HDF5 = 0 command with DISP(PLOT)=ALL it appears that the mode shapes are for the G SET. In HDF Compass I see /NASTRAN/RESULT/NODAL/EIGENVECTOR has the same grid ID's from a USETPRT of the G SET. The A SET has 529 dofs while the G SET…
Dear MSC Nastran community,
I am printing CBEAM element forces in F06 file, using SET and FORCE case control command (CCC).
The problem is: I have multiple element sets, and I want to print out forces for each SET ID in separate table. However…
I am checking the theory on page 117 of the Nastran Embedded vibration fatigue user's guide, in this page how the von mises equivalent stress calculate is shown, but I could not get the same time-based stress as it shows in the bottom page, the Excel…
