Prakash Pagadala

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About Prakash Pagadala

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  1. Jahnavi, How many elements are there in your model. There are some limitations with number of elements. Is it possible to share the model file?
  2. Hi @Michael Lauxmann The part to be reduced out of the model through the static reduction model reduction technique is referred to as a superelement. In OptiStruct, ASET or ASET1 bulk data entries are required to indicate the boundary degrees of freedom of a superelement, meaning the set of degrees-of-freedom where the component (being replaced by direct matrix input) connects to the modeled structure. Both the accuracy and the cost of static reduction increase as the number of ASET entries is increased. For example, by using static reduction, the size of the matrix to solve will become smaller, but if the reduced matrix (DMIG) is very dense, then the solution time will become larger than the solution time for the full model where the matrix may be sparse. Hence, the selection of ASET entries is very important in performing an efficient analysis using DMIG. In order to prevent the reduced matrix from being too dense, ASET entries are chosen carefully (see the next figure) instead of creating ASET entries for all of the boundary nodes between the design and non design spaces. Due to the small size of the problem used for this tutorial, the selection of ASET entries may not affect the solution time. Please refer to this tutorial: OS-2070: Topology Optimization of a Reduced Model using DMIG
  3. Ram, Also notice the error is because of a node. Check if the node is involved in contacts.
  4. Ram, Normal hourglass energy valid upto -15% as per help. Keep the analysis going and review the results at the end.
  5. Hi Ram, Negative energy is seen when energy is dissipated from system. There could be lot of reasons for the same, it could be because of damping or hour glass, etc... Review the results and see the whether they are realistic or not. Also try to use physical stabilization to reduce hour glass deformations.
  6. @Virgilio Lo Presti ESLM can be used for optimization under dynamic loads. But this method only supports PSHELL and PSOLID. So if you are using any orthotropic property like PCOMP(G), PCOMPP, it is not supported right now.
  7. Hi @bhumkaromkar Goto Control cards>> Global output request>> FOS. This should output FoS for fatigue when you have a fatigue subcase.
  8. @Virgilio Lo Presti No, it is not in the current version of HW. Can you explain your use case and what you are trying to optimize so that I can check and suggest the best way to deal with it?
  9. Hi @Virgilio Lo Presti You can do optimization within RADIOSS. Starting from 13.0 optimization is added in RADIOSS. You can refer to below example on RADIOSS help for methodology
  10. Hi @bhumkaromkar What about Stress amplitude. I think this is what causing the problem.
  11. Hi, Is it possible to share the model file and .out file with us? Use the file transfer link available in my signature below to share the model files.
  12. Jahnavi, Displacement means enforcing the node to displace by a certain magnitude. In RLOAD you can change to Acceleration. Since you have only one load specify the same for both J and K If you have given a value of 5 in SPCD for instance, it will be used as a factor in tabrnd1.
  13. Hi. Go to Extract options in MidSurface panel and change to Results in Middle surface component to get midsurface in parent component. If there are any extracted plates you can review them and retain them if you want or create new.
  14. Hi Umar, Did you try iSO contour on HyperView? Does it show same contour through out the model? Can you share the .out file and also model file using file transfer link available in my signature below?
  15. Hi @NicolasRi You can export ply data to .stp format using "Ply Geometry smoothing" option available in OptiSrtuct Aerospace profile. You can also use OSSmooth>> PLYShape option to export CAD data and you don't need a .sh file for this