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etrud011

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  1. Hello, I would like to extract the local stiffness elements as well to compare my FE implementation to Optistructs. Is there a method to do this? Thanks, -Eric
  2. Your welcome Sebastien, The tcl script I was referring to does not seem to be in the file exchange unfortunately. However extracting the tapered beams should be relatively straighforward. Basically, for each tapered beam or element with card image PBEAML, get the dimensions of both radii. From there you create a solid cone using the coordinates of nodes associated with the beams. Continue until all the beams have been selected. Then when all the cones are created, mesh the exterior with trias and then export to stl. The final step is to merge the cones in another software. If you haven't used tcl before then you should look into the help files to learn more about the hypermesh api. Your commands are also printed out in a 'command.tcl' file during hypermesh sessions.
  3. The optimization is simple size optimization of tapered beam elements (the same as lattice optimization, but I have built the model myself). There are many design variables representing intersection joint between the beams. DEVPREL1 cards are made to link the design variables to all the tapered beams ends.
  4. Hi Rahul, I am running sizing optimizations, not topology. Is there a way to generate a new 'updated' fem model after sizing operations are done? -Thanks
  5. Hello, I am running some optimizations and would like to generate a secondary .fem file as an output. The new fem file would have the updated dimensions of the input model (similar to the second optimization step during lattice optimization). My model has many design variables so updating them manually would not be feasible. Any help is greatly appreciated. -Eric
  6. I believe that there is a tcl script in the file exchange that can create cylinders from the tapered 1d elements. From there you can export the cylinders as stl objects and then use another software to merge them all together (meshmixer). Another method that might work is by using Altair Inspire to automatically generate the stl file with the lattice beams.
  7. Hello, I am running a static analyses in Optistruct and then importing that data into MATLAB. The results are being uploaded to MATLAB by reading a punch file (.pch). However I noticed that the pyramid element results are omitted from the punch file. Is there a way to include the output of pyramid elements to the punch file? Thank you, -Eric
  8. Thanks for your help. It turns out that only the element densities are required for OSSmooth and the other information can be omitted.
  9. Hello, I would like to generate my own shapefiles to be used with OSSmooth to create new topologies. Is there any information on how the file is constructed? I understand that the beginning of the file has element ids with their associated relative densities but there are many other fields whose contents are unknown to me. Thank you in advance, -Eric
  10. Thank you Pandurang and Vipin! I am trying to delete tetra4 elements with aspect ratio above 10^5. But hypermesh is telling me that the aspect ratio some of those elements is 4.12 and will not create a mark on them for deletion. Optistruct will not start because there is a validity check fail due to aspect ratios above 10^5. How is that possible? The code I am using is below; *createmark elems 1 "all" #does not find problems elements set elems_ids2 [hm_getelemcheckelems 1 3 aspect above 100000] It does not find the problem elements. Also I do not understand how to use "hm_getelementsqualityinfo 1 0 2;", it returns zeros each time. Edit2: The problem was that I was looking at the wrong aspect ratio type.
  11. Hello, I would like to know how to find elements that fail the validity check and then delete them. Is there a method to do so in tcl? Thank you
  12. I added "cd C:/Users/e-tru/Documents " to my tcl script and I receive no errors anymore. Thank you
  13. The current directory when I start hypermesh normally is; C:/Users/e-tru/Documents When hypermesh is called from the matlab command string the directory changes to: C:/Windows/System32
  14. I've made all my folders readable. The file also exists, I improperly wrote the path in my second post. The problem still persists. It might have something to do with my environment variables when I am inside the command prompt that is initialized by matlab.
  15. Hi tinh, The file path is verified, the one written in my first post was shortened. I removed all the spaces in the file name and path and still receive errors. If I copy paste the same code from the tcl script , it works just fine. It does not work if the script is called from the command prompt. Four slashes where used because some of the tcl script is printed from matlab. After rewording the tcl script this error shows up: I am not sure why this is happening (Encountered error (check read/write permissions and file existence)). The script looks like this; ######################### #upload the solid layers# ######################### puts "Uploading Solid Domain" *createstringarray 2 "isosurf: 1 2 0.7 0 -1 0 0 10 30 1 0" "other_params: 1 0 0 0 10 0" *ossmooth_12 0 0 2 1 "C:/Users/e-tru/Documents/Altair/Practice/Mult_objective_Stage_2_Practice/Large_Tension_Hinge_Rebuilt_2.2_Stage_2_Initial_1.fem" "C:/Users/e-tru/Documents/Altair/Practice/Mult_objective_Stage_2_Practice/Large_Tension_Hinge_Rebuilt_2.2_Stage_2_Initial_1.sh" "" 1 0 1 2 puts "Error During Solid Domain Tetmeshing: Refining Mesh" } else { puts "Solid Domain TetMesh Succesful!" }
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