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Recent content by jcmbl

  1. jcmbl

    Random time-varying concentrated loads?

    mihailmi, actually I was asking for the bits of your subroutine just to have a model for my problem. I've never used subroutines, so it's a bit confusing at the beginning. From what I understood, the DLOAD subroutine, as well as UTRACLOAD, is called for each integration point. That means I have...
  2. jcmbl

    Random time-varying concentrated loads?

    mihailmi, can you please share your UTRACLOAD subroutine? How do you pass the pressure magnitudes on? I guess you are doing some flutter analysis, but for static aeroelasticity, a DLOAD wouldnt be more appropriate? Cheers
  3. jcmbl

    map pressure onto another surface

    and for cambered airfoil?
  4. jcmbl

    map pressure onto another surface

    Guys, I want to map the pressure distribution from the outer skin onto the camber line. I assume the structural integrity of the airofoil is provided by the camber and no other stiff internal structures. The pressures on both surfaces after mapping are equal if the airfoil is thin (max 6%...
  5. jcmbl

    aeroelasticity study

    pja, I'm still not clear. You are talking about timestep, so I guess your analysis is an explicit and time-dependent. That leads me to the complex part of aeroelasticity, i.e., dynamics (flutter, buffeting etc). I'll better start with static aeroelasticity, where your time step has no...
  6. jcmbl

    aeroelasticity study

    pja, thanks for the feedback. From what I know, an iterative procedure until the convergence (i.e., oscillatory) criteria is met. I'm not sure exactly how to approach my problem: an airfoil with a simple actuated flap. I deflect the flap with a force F, run CFD, extract pressure...
  7. jcmbl

    fitting an elastomeric material

    Hi guys, I'm using a hyperelastic foam core in my FE model. I am using Abaqus to fit the material so that I can optimize the parameteres defining the foam core during bending. The parameters are: mu (i.e., shear modulus), alpha (i.e., shape of the stress-strain curve) and beta (i.e., shape of...
  8. jcmbl

    output file with displaced coordinates?

    if you don't want to be bothered with .inp file from a text editor, you can also add the card whithin CAE through Keyword Editor (see meniu) *Node Print [freq=99999 - optional] U If you adjust your deck from a text editor, and then run it with CAE, you won't get the anything in .dat file (at...
  9. jcmbl

    aeroelasticity study

    Hi guys, Does anyone have any experience in doing some aeroelasticity studies? I mean coupling CFD (e.g., Fluent) and FEA and issues such as pressure distribution from CFD into FEA mesh or type of appropriate FEA job. I've read a paper wherein a FEA bump is subject to aeroelastic forces...
  10. jcmbl

    Random time-varying concentrated loads?

    mihailmi, if you got a solution to your problem, please share it, as I've experienced nearly the same difficulties. Thanks, J
  11. jcmbl

    mass and stiffness matrix extraction

    Hi guys, Does anyone know how to extract the mass and the stiffness matrix of a system (not only for an element)? I need this kind of output to handle further with some other software for some research purposes... I tried using *Substructure matrix Output card, but it seemed not be...
  12. jcmbl

    official data on performance

    Hi guys, Does anyone know any paper or book with official data about the performance of a wing of any commercial airliner, providing ailerons deflection and roll moments, pitch due to roll, etc. Cheers
  13. jcmbl

    Compute an integral from data points

    sorry guys for the stupid question. I did some drawings to help me understand the area I needed, but it was proved I was doing something silly (I was getting some open segments of the curves which I couldnt compute). Of course the area is the difference between the 2 curves, although I'm not...
  14. jcmbl

    Compute an integral from data points

    Hi guys, I have 2 weird sets of points to define 2 curves. I need to compute the area between these two. Is there any straightforward way to do it? The position of the curves is changing with respect to X axis, so I'd need a general methodology to do my task, not just for a specific set of...
  15. jcmbl

    buckling

    try pasting the code in here to peruse it. Maybe you just use some other axes for load function, if you haven't used CAE. I know there is in the manual an example like yours..try fiddle it, although there's nothing clever in it.
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