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How can extract the mass, stiffness and structural damping matrices from a .bdf file?

kenny.fernando.conto
Hi,
 
I need to extract the mass, stiffness and damping structural matrices from a .bdf files. Normally I just needed to add the following lines after BEGIN BULK in the .bdf file to get that:
 
"PARAM,EXTOUT,DMIGPCH"
"PARAM,COUPMASS,1"
 
Unfortunately when I'm trying to get that, Nastran is not able to create the .pch file where all information related to the matrices are stored.
 
So, How can I solve this problem? Is needed to add some addicional information inside to the .bdf file?
 
Thank you for your support
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  • 0
    Hi,
    As I said before, in order to extract that information I only needed to write the following lines after BEGIN BULK in a .bdf:
    "PARAM,EXTOUT,DMIGPCH"
    "PARAM,COUPMASS,1"
     
    Unfortunately, when I tried to get that, the Nastran is not able to return me the PCH file where that information is stored.
     
    Actually I'm using the Apex model in order to generate the BDF files.
    The version of Nastran that I'm using is the 2019.0.
     
    I'm attaching the bdf file of my model.
     
    Thank you for your support.
Reply
  • 0
    Hi,
    As I said before, in order to extract that information I only needed to write the following lines after BEGIN BULK in a .bdf:
    "PARAM,EXTOUT,DMIGPCH"
    "PARAM,COUPMASS,1"
     
    Unfortunately, when I tried to get that, the Nastran is not able to return me the PCH file where that information is stored.
     
    Actually I'm using the Apex model in order to generate the BDF files.
    The version of Nastran that I'm using is the 2019.0.
     
    I'm attaching the bdf file of my model.
     
    Thank you for your support.
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