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Reading multiple subcases from a Punch (*pch) file into Hypergraph

Hi -it doesn't appear that Hypergraph can read multiple subcases from a punch (*pch) file at once. The punch file is from an Optistruct run and has frequency response functions (FRF) curve data within…. in my case vibration transfer functions in velocity to/from several locations in a model. Converting the file to a CSV format is possible but you lose the block header information which is useful when filtering curves (hopefully even more useful from 2025.1 when that's out).

So, can it be done right now and if not, when?

Thanks,

Kristian

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Accepted answers

almeidaaap

Hi, KrisGarner,

Have you tried to load the subcases using the Multiplefiles option?

Regards,

Arthur

All comments

almeidaaap

Hi, KrisGarner,

Have you tried to load the subcases using the Multiplefiles option?

Regards,

Arthur

KrisGarner

Thanks for your answer -yes, it would seem that this does this trick. The only thing I would comment here is that this is a bit counter-intuitive as the "source" I am using is a file -I am not sure how "subcase" is different? (all pch files contain subcase data). Perhaps in future versions the labelling could be made clearer, or the file reader GUI improved so that it allows multiple subcase selection without having to choose a different option?

KrisGarner

n.b. this appears to work for data where you have inputs/responses as a fully populated matrix, but I'm not sure it does for dynamic stiffness (or point mobility) data where the responses are essentially along the diagonal? (i.e. input/response at point 1, input/response at point 2, etc…). I have the same issue with reading universal files with FRF data (UNV-58 format) from physical testing.

Do you have any further thoughts on this @almeidaaap ?

almeidaaap

Are you able to share a file? So I can perform some tests here.

KrisGarner

Yes, I can do. Please email me a file upload link… are you able to see my email address from my account details?

Thanks,

Kristian