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
