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Model reduction using SOL103, DMIG PCH Format

prasad.guduguntla.external
Hello,
I performed model reduction using SOL103 DMIGPCH format.
  • EIGRL method
 
GRAV or ACCEL loads, Point Loads are applied on the reduced model, Analysis is performed using SOL101. ​
  • From the f06 file, OUTPUT from Weight check matches to the physical model.
  • OLOAD resultant, SPC force resultant, displacements from the GRAV loads shows zero. What could be the reason?
 
for your info:
I performed the same process OP4 format, very thing works out well.
 
Thanks,
Prasad.
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  • 0
    ​Hi Prasad,
     
    I see you haven't had a reply to your question yet, so I'll try to help.  In general, I suggest doing a sample first to test out this process, and if there are issues, to contact technical support so we can assist.   Having a sample you can send us to run start to finish really helps in the debugging stage.
     
    The first thing to point out is it is necessary to apply the GRAV loading during the creation of the external SE.   For the residual structure, GRAV loading gets applied prior to the upstream mass being included.  This approach can be problematic, as the upstream subcase needs to be 'aligned' with the downstream subcase for the upstream loads to combine correctly with the downstream loads.
     
    Creating the external SE using the op4 or op2 method seems to work well for GRAV type loading.  When using the pch format of storing the reduced matrices, remember you must add the P2G=PAX case control command (along with the M2GG/K2GG commands).  This applies the upstream loading due to the GRAV effects. 
     
    Regards,
    Don
     
    P.S.  This all assumes you are using the EXTSEOUT method of creating the external SE, and that you are using the .asm and .pch files for the assembly run.
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  • 0
    ​Hi Prasad,
     
    I see you haven't had a reply to your question yet, so I'll try to help.  In general, I suggest doing a sample first to test out this process, and if there are issues, to contact technical support so we can assist.   Having a sample you can send us to run start to finish really helps in the debugging stage.
     
    The first thing to point out is it is necessary to apply the GRAV loading during the creation of the external SE.   For the residual structure, GRAV loading gets applied prior to the upstream mass being included.  This approach can be problematic, as the upstream subcase needs to be 'aligned' with the downstream subcase for the upstream loads to combine correctly with the downstream loads.
     
    Creating the external SE using the op4 or op2 method seems to work well for GRAV type loading.  When using the pch format of storing the reduced matrices, remember you must add the P2G=PAX case control command (along with the M2GG/K2GG commands).  This applies the upstream loading due to the GRAV effects. 
     
    Regards,
    Don
     
    P.S.  This all assumes you are using the EXTSEOUT method of creating the external SE, and that you are using the .asm and .pch files for the assembly run.
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