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davewalker348

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About davewalker348

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  1. Is there a good way to do an FEA analysis with a lattice structure - I tried just running an analysis on the imported .fem and I don't seem to be getting good results. Also, it seems as if I'm not always getting a component for each lattice. Rather (especially when I choose a low lattice density), I sometimes get a single component for the entire structure. Is that a problem?
  2. Prakash, I figured it out - I just had the element representation set incorrectly. Thanks -Dave
  3. No I haven't, I did the problem exactly like the example. Therefore, I assume its something I have set in Hyperworks.
  4. I've been doing my own lattice designs, as well as the baseline problem. I feel like my sizing optimization is not working. The picture below is the final .fem from the example and the members appear 1D. It definitely does not match the example in appearance. Any suggestions? Thanks -Dave
  5. I feel like I tried that a ton of times - whatever the difference was it worked. Thanks! Is there any way to export the geometry? Perhaps in IGES or STEP form. If so, what is the process for OSSmooth (ie which .fem and .sh do I select). Thanks -Dave
  6. Thanks, but I couldn't get that to work either. I keep getting error 1484, field 3 contains embedded blanks if I try it with the '+'. However, I noticed you said there is no way to export the model anyway. If thats the case, lattice doesn't do me any good. -Dave
  7. I went through this tutorial for my own design and the model attached: http://forum.altairhyperworks.com/index.php?/topic/14501-lattice-structures/ I can't get the new .fem to show up - I get an error stating: *** WARNING # 1495 Unknown bulk data card: 'LATTICE'. and NOTE # 6183 DOPTPRM, POROSITY is valid with lattice optimization only. Optimization problem is set to regular topology. I think it has something to do with how I added the card. The attached image is a snip from my .fem text file. What am I doing wrong?
  8. Ok, so even if I have only one response, which has a "buckling mode" entry, I consider the number of modes ND is set to (as long as its less than or equal to MAX_BUCK)?
  9. Im tyring to do a buckling free-sizing optimization - I have constraints of buckling and stress with an objective to minimize massfrac. I went throught the tutorial on free sizing (OS-4050), but I'm a little confused which modes are considered for the optimization. I have 1 buckling response (with mode number: 1). When I created the load collector, ND = 10. I also selected "MAXBUCK" under opticontrol. The tutorial suggested this consideres the lowest 10 modes, is this correct?
  10. Wow, that was easy. I think that is exaxtly what I'm looking for. Thanks Tinh
  11. Is there a way to apply multiple loadsteps so that the optimizer performs an analysis for multiple loading conditions during each iteration independantly? This is different than creating a 'LOAD' load collecter where the relative load conditions are summed. Simply put, I want a topology optimized design which will satisfy multiple conditions independantly.
  12. I used VWT as part of a masters thesis - it worked very well. However, I need to some documentation on how the program (mostly AcuSolve) performs its analysis. This could include a written description of what happens during the iterations and/or specific equations. Is there anything like that out there? Thanks -Dave
  13. Well it at least answers my question! Thanks for the quick response.
  14. By spacing optimizaiton I mean determining the number and location of ribs, i.e. proper spacing of the ribs. To clarify what you are suggesting, you are saying to run a topology optimization on the ribs globaly, utilizing pattern repition. Then just look at the results from the stress analysis to determine which ribs are necessary. Is this correct?
  15. Is there a way to optimize spacing on linear 2D components; ribs in an aircraft wing (see picture) for example. It would probalby be an iterative process starting at the root. My thesis advisor thinks this should be something Optistruct can do.
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