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  1. jamesdean2

    Drop Test in Transient Structural

    Hi pnomura, Generally, in a case like this, you would want to give your dropped object an initial (calculated) velocity and move the object to within close proximity of the surface to be impacted. That will ensure that the contact search algorithm has a good chance of finding the contact geometry.
  2. jamesdean2

    Nastran op4 & pch modification

    Hi Martin, I've sent you some Python pointers on how to manipulate the NASTRAN data.
  3. jamesdean2

    Nastran op4 & pch modification

  4. jamesdean2

    Nastran op4 & pch modification

    Hi Mrkvel, I've submitted several CLA packages using pyYeti, but most of the work is done in pandas. My submittals consist of: 1. An Excel file with the LTM, ATM, & DTM. 2. The partitioned op4 file that contains stiffness and mass matrices as well as acceleration, displacement, and loads...
  5. jamesdean2

    Modal stiffness and mass matrices extraction

    Sorry, I think I misinterpreted your original post, that said, wrt item 1, typically if the aeroelastic analysis is not done internally within NASTRAN then the generalized stiffness/mass/damping matrices are taken from NASTRAN and processed externally. If you want NASTRAN to do that and if you...
  6. jamesdean2

    Modal stiffness and mass matrices extraction

    Hi Spyros07, Your best approach would be to skip the DMAP alters and use NASTRAN CMS (ie, superelement). You'll probably want a reduced model anyway for aeroelastic's. I'm pointing you in a different direction here, and it's not that you can't use DMAP, it just wouldn't be what I would call best...

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