creation stiffness matrix
Hi,
I was wondering how the creation of the stiffness matrix is defined. I don't mean how I implement it but I mean how OptiStruct knows how to generate a stiffness matrix. I was looking in the documentation for this but couldn't find it. Can someone help me?
Thank you
Answers
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Hi Eline,
You can do PARAM -> POST_V1 and then select -5. you will have Stiffness and Mass matrices (op2 file). But I don't know how to read them ...
If you have any idea how to read *k.op2 or convert it to an ASCII file, please let me know.
Thank you,
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I would like to know how to export full global stiffness and mass matrices in Optistruct to an ASCII file as well. PARAM > POST > POST_V1 set to -5 seems to be outputting some mass and stiffness files to op2 format but they are binary and thus not human readable. Any help is appreciated; thank you.
For some reason, PARAM > EXTOUT > DMIGPCH doesn't output the full global matrices.
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Altair Forum User said:
I would like to know how to export full global stiffness and mass matrices in Optistruct to an ASCII file as well. PARAM > POST > POST_V1 set to -5 seems to be outputting some mass and stiffness files to op2 format but they are binary and thus not human readable. Any help is appreciated; thank you.
I'm looking for the same thing. I found python package 'pyNastran' to read op2 file.
https://pynastran-git.readthedocs.io/en/latest/
I'm exploring this package ... I will let you know if I found something
Altair Forum User said:For some reason, PARAM > EXTOUT > DMIGPCH doesn't output the full global matrices.
Yeah indeed, it's a reduced matrices ....!
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@FaroukM did you find how to use pyNastran to read stiffness and mass matrices?
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