https://community.cadence.com/cadence_technology_forums/physical-system-simulation/msc-nastran/en-USTelligent Community 13https://community.cadence.com/cadence_technology_forums/physical-system-simulation/msc-nastran/f/msc-nastranTue, 29 Sep 2026 14:43:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:10c6229b-2967-422f-8a94-f52c667b4885https://community.cadence.com/cadence_technology_forums/physical-system-simulation/msc-nastran/Tue, 29 Sep 2026 14:43:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:334b97c1-0ed0-4ae0-b04d-6fdd6ad1c2fdhttps://community.cadence.com/cadence_technology_forums/physical-system-simulation/msc-nastran/f/msc-nastran/74334/is-it-possible-to-restart-a-103-and-append-more-mode-shapes-to-an-existing-solution/1432832Mon, 07 Sep 2026 10:50:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:e20dc3b2-793c-4765-b4f2-15dbf0a931b7Sanjay PatelYes, to best of my knowledge there is no way to combine modes from two runs and restart into a third run for SOL 111 or 112.https://community.cadence.com/cadence_technology_forums/physical-system-simulation/msc-nastran/f/msc-nastran/74334/is-it-possible-to-restart-a-103-and-append-more-mode-shapes-to-an-existing-solutionSat, 05 Sep 2026 20:35:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:15dcf5fd-d5a7-4ff4-8f19-735fb05e21b6StumpyMy main use case for restarts is to solve a SOL 103 and then use those modes in SOL 111 or SOL 112. This works very well. I am trying to explore expanding the frequency range with restarts to save time. I typically solve modes to frequency range based on the analysis type, low frequency sine, structure borne vibrations and vibroacoustic. Each one requiring higher cut-offs. I recently tried solving a model 500 Hz and then restarting the 103 to add modes up to 2500 Hz. I did this by restarting and changing the METHOD and EIGRL cards in the restart. From what I can tell...the entire frequency range was solved again. Is there a way for Nastran to append to the existing in the DBALL and not resolve modes? Can it be done in two (or more) separate jobs and then merged?https://community.cadence.com/cadence_technology_forums/physical-system-simulation/msc-nastran/f/msc-nastran/74293/damping-on-external-superelements-in-analysis-run/1432731Fri, 19 Jun 2026 07:54:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:72010529-565c-437b-b309-bea55614b618Sachin. DaniIf you do not include a damping matrix during the reduction run, you cannot add it later during the assembly run. The OP4 file will only contain the matrices that were requested during the reduction. To include a structural damping matrix (K4), you must specify it during the reduction run using the appropriate way. All damping is cumulative in MSC Nastran. So, for example, if modal damping is defined on a superelement’s component modes and modal damping is defined on the residual structure modes, the damping will be combined and the superelement may unintentionally be overdamped.https://community.cadence.com/cadence_technology_forums/physical-system-simulation/msc-nastran/f/msc-nastran/74293/damping-on-external-superelements-in-analysis-runThu, 18 Jun 2026 16:48:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:037e11fe-cd54-4ad3-8a37-6813c63ba954Raffaele PatuanelliHi everyone, I have two superelements condensed with the Craig-Bampton technique without defining a damping matrix. The files are in .op4, .pch and .asm format. I need to run a modal frequency response analysis with a main structure to which I attach the two external superelements. As I said, the superelements do not have any damping matrix defined in the op4 files, but in the analysis I would need to apply a damping loss factor of 6% on one superelement and 8% on the other one, on top of this I need to apply a global structural damping acting on the residual structure that I can easily apply with PARAM,G, or similar parameters. So my question is, is there a way when importing external superelements for dynamic analysis to define a structural damping matrix for each superelement, when no damping matrix was defined during condensation run? Thanks!https://community.cadence.com/cadence_technology_forums/physical-system-simulation/msc-nastran/f/msc-nastran/74282/how-i-output-model-with-9-digits-numbering-from-ansa-for-nastran-sol-103/1432719Mon, 01 Jun 2026 07:34:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:9a3acd0c-f725-4df9-aa0d-c4365e5b6bd7Jagath C MHi Nikhil, You can export the Nastran file in long format from ANSA using the steps below: File --> Output --> Nastran --> Save --> Enable Long for Format selection --> OK But this may not resolve the issue because, with the IFPSTAR parameter enabled, Nastran can technically handle IDs up to 214,748,364. With IFPSTAR off, IDs up to 10 digits may be accepted. However, IDs above 99,999,999 may cause issues with internal ID generation, output codes, and compatibility with other software. You might need to Turn off the IFPSTAR by adding the line NASTRAN IFPSTAR=NO at the very beginning of your input file. You can do it also by adding IFPSTAR=NO in the optional keywords before running. Thanks Jagathhttps://community.cadence.com/cadence_technology_forums/physical-system-simulation/msc-nastran/f/msc-nastran/74282/how-i-output-model-with-9-digits-numbering-from-ansa-for-nastran-sol-103Wed, 27 May 2026 03:21:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:e0eb0abd-9c77-425d-9547-b234c0c3b3e2Nikhil BauskarI would like to simulate the model with Node and Element numbering in range 800 000 000 - 999 999 999. How can I output the data from ANSA preprocessor or what changes should be done in nastran input deck. Currently the error shows: *** USER FATAL MESSAGE 9994 (BULKPM) GRID near line 29 User action: ID:800000000 < 214748364 *** USER FATAL MESSAGE 9994 (BULKPM) PLOTEL near line 1989069 User action: EID:800516927 <= 214748364https://community.cadence.com/cadence_technology_forums/physical-system-simulation/msc-nastran/f/msc-nastran/74259/error-when-running-msc-nastran/1432663Mon, 27 Apr 2026 06:27:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:eee6a4ed-6a9b-4c57-a9e2-d0ba823ee444Vivek BhardwajCould you please reach out to support at mscnastran.support@mscsoftware.com our config team will reach out to you. Thanks,https://community.cadence.com/cadence_technology_forums/physical-system-simulation/msc-nastran/f/msc-nastran/74259/error-when-running-msc-nastranMon, 27 Apr 2026 03:38:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:605f67ce-ea57-415b-baa5-452123f696d6Nils LangeHello all, when I try to invoke the solver (2025.2) I get the error Ungültiges XSL-Format (oder) Dateiname Invalid XSL format (or) file name. It is a German Windows 11 System and I get the error no matter if I start it from PATRAN, apex or directly in the terminal. My colleagues do not get the error and I cannot find anything related in the documentation/installation guide or similar. Kind regards Nils Langehttps://community.cadence.com/cadence_technology_forums/physical-system-simulation/msc-nastran/f/msc-nastran/74254/how-can-i-get-the-uset-into-an-h5-file-output/1432654Tue, 14 Apr 2026 11:56:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:99ab37ff-abc7-4006-8194-316bf2ca8253Vivek BhardwajYou can use DIAG 15 to identify the name and location of table in f04 file.. And then use TABPRT to print that.in f06 One example of that: Print USET list for g-set and s-set in internal order using row sort. TABPRT USET,BGPDT//’USET’/0/18 $ You can look at the dmap user guide for more details.https://community.cadence.com/cadence_technology_forums/physical-system-simulation/msc-nastran/f/msc-nastran/74254/how-can-i-get-the-uset-into-an-h5-file-outputMon, 13 Apr 2026 15:37:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:f1ca2c4b-c0d0-4593-af0d-e70f6044a0b1StumpyI'm able to get stiffness, mass and results matrices out in H5 with relative ease but I'm unable to get USET. My current work around is to use VEC USET/PARTA/'G'/'A' $ etc to create the partition vectors I want. I then send them to H5 with CRDB_MTX PARTA,,,,//'PARTA' $. This works well...but it would be easier to just get the USET table. Is that possible? I tried just sending the thing to h5 with CRDB_MTX USET,,,,/'uset' $ but it made an empty complex matrix. I also tried to find a way to convert it from a table to a matrix, but also struck out there.usetNastranh5https://community.cadence.com/cadence_technology_forums/physical-system-simulation/msc-nastran/f/msc-nastran/74221/extract-only-rms-output-after-random-analysis/1432566Tue, 24 Feb 2026 04:20:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:a4b44eaf-6aa4-4a99-b500-68b6c96dd2afRemi FaberI work with NASTRAN 2018, I was not aware that these features had been added, thank you for your reply!https://community.cadence.com/cadence_technology_forums/physical-system-simulation/msc-nastran/f/msc-nastran/74221/extract-only-rms-output-after-random-analysis/1432565Tue, 24 Feb 2026 04:12:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:451f9d5a-ce87-47d0-a2ae-88bca351018eVivek BhardwajFor RMS vonmises stress output you can use keyword RMSVM like below: STRESS(RMSVM)=ALLhttps://community.cadence.com/cadence_technology_forums/physical-system-simulation/msc-nastran/f/msc-nastran/74221/extract-only-rms-output-after-random-analysis/1432564Tue, 24 Feb 2026 04:10:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:0628e317-a7f5-473a-b499-28261fc04d8dVivek BhardwajYou can use case control entry RANDOUT (PSDF, op2) = YES For now it is only supported for PSDF random outputs.https://community.cadence.com/cadence_technology_forums/physical-system-simulation/msc-nastran/f/msc-nastran/74221/extract-only-rms-output-after-random-analysisTue, 24 Feb 2026 01:22:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:6e0b935f-411c-4ffd-b8cb-9cf281d85903Remi FaberDuring a random analysis, I would like to extract only the RMS values of certain quantities, such as the force in certain elements or the stress in others. I use the following commands: FORCE(PLOT,PHASE,CRMS,NOPRINT) = 100 STRESS(PLOT,PHASE,CRMS,NOPRINT) = 200 I end up with two set of results by frequency (CRMS + result of the frequency analysis) in addition to my RMS values, which takes up a lot of space in my results file. Furthermore, many results are extracted to my f06 file, even though I only request PLOT. Is it possible to extract only the RMS values to the op2 file and avoid writing any results to my f06 file?RMSrandomhttps://community.cadence.com/cadence_technology_forums/physical-system-simulation/msc-nastran/f/msc-nastran/74136/script-for-deleting-nul-files/1432392Fri, 28 Nov 2025 07:07:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:82a989bf-e583-4a07-b37f-7614e1e65d02C BThe following did the job: @echo off setlocal EnableDelayedExpansion for /f "delims=" %%d in ('dir /B /S *nul') do ( del "\\?\%%d" )https://community.cadence.com/cadence_technology_forums/physical-system-simulation/msc-nastran/f/msc-nastran/74136/script-for-deleting-nul-filesThu, 27 Nov 2025 11:38:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:d8b2db29-07a9-466e-9dcd-da999d19c92fC BI should have read https://simcompanion.hexagon.com/customers/s/article/Nastran-2031-1-on-Windows-11-creates-a-not before ... but now I have 8 training laptops with a huge lot of folder which contain the file named nul. Has anyone a script or similar that I can run on each laptop to clean them up? Doing it file by file with the given command takes much too long. Thanks! Christianhttps://community.cadence.com/cadence_technology_forums/physical-system-simulation/msc-nastran/f/msc-nastran/73013/matrix-xaav-for-upstream-superelement-100-does-not-exist/1432366Mon, 17 Nov 2025 06:41:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:9f27d95b-bf75-461b-8dbe-e08746b3f958Vivek Bhardwaj*** SYSTEM FATAL MESSAGE 4252 (SEMA) MATRIX XAAV FOR UPSTREAM SUPERELEMENT 100 DOES NOT EXIST. means that the current superelement requires all of its upstream superelement matrices for assembly, but the matrix XAAV (or similar, e.g., KAAX, MAAX) for superelement 100 is missing. Common Causes The upstream superelement's database (DBSET) is not attached : The assembly run cannot find the required matrices because the database containing the reduced superelement is not available. The upstream superelement did not complete reduction in a previous run : If the reduction (creation) of the superelement was not completed successfully, the required matrices will not exist. Missing K2GG and M2GG entries in Case Control : For external superelements created via DMIGPCH, you must include K2GG=KAAX and M2GG=MAAX in the Case Control section. If these are missing, the error will occur for each external superelement being attached. Ensure the upstream superelement is properly reduced : Rerun the reduction of the upstream superelement and verify that it completes without errors. Attach the correct database : Make sure the DBSET and/or DBLOCATE'd database containing the upstream superelement matrix is attached in your assembly run. Include K2GG and M2GG in Case Control : For DMIGPCH-based external superelements, add the following lines above the subcase level in your Case Control section: K2GG=KAAX M2GG=MAAX SUBCASE 1 METHOD = 1 This ensures the required matrices are available for all superelements and the residual structure. If the residual structure does not have DMIG entries, a warning may appear, but it can be ignored if not needed. Check file inclusion order : When including external superelement files, ensure that the .asm (assembly) file is included before the .pch (punch) file in the main bulk data section. Example Correction K2GG=KAAX M2GG=MAAX SUBCASE 1 METHOD = 1 BEGIN BULK INCLUDE 'SE10.asm' INCLUDE 'SE10.pch' ENDDATAhttps://community.cadence.com/cadence_technology_forums/physical-system-simulation/msc-nastran/f/msc-nastran/74120/no-op2-stress-results-with-sol-101-and-pcompls/1432364Sun, 16 Nov 2025 22:33:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:24e13152-93e4-42bc-8021-4051270686f1Sanjay PatelPlease try the HDF5 output. MDLPRM,HDF5,1 in the bulkdata section. If you still have issues please contact the help desk with necessary input files and indicate which versions of software you are using.