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Found 4 results

  1. I've been trying to learn free size optimization using optistruct. Free size optimization varies the thickness of elements and works only for shell elements and not for solid elements. So, how do I convert the results of free size optimization (which is in the form of a 2d mesh with variable thicknesses for each element) into a 3D cad model. Thank you
  2. Hello CAE Enthusiasts, Im currently trying to do a Free Size optimization on a composite model which is built on a ply based approach. After all, it seems that the Optimization is running fine. I got a feasible design after 7 Iterations and all constraints are satisfied. However, if i import my optimized FreeSize.fem into HyperWorks again the weight is off by 22.5 %. My optimization constraint is a weight of 600 grams. As a result I got roughly 735 gramms. The objective of this optimization is to minimize weightedCompliance. I tried several attempts to figure out what is wrong but i don`t get it. I would be glad if someone would get a hint or could take a look at the attached model. Thanks in advance. StaySafe and greeting from Germany. RW_SwanNec_SizeModel.hm RW_SwanNec_SizeModel.out
  3. In a free size optimization, i always get from a ply, 4 different ply shapes, How can i change this number?
  4. Hi there, I was trying to do a torsional stiffness optimization model on a formula student monocoque. I followed the example but there are some details it didn't cover which I was hoping someone on here could help me with. Firstly is there a way to optimize some plies in a laminate and not others? For example I have some plies which are the base plies in the laminate for the monocoque which I don't want optimized and some 'super plies' which I do. Is there a way to do this? Secondly I tried a free size optimization, however I have a stiffness target I wanted instead of maximising the stiffness. I set this target through setting a static displacement limit on the two front axle nodes vertically to represent the torsional stiffness. The objective I set was to minimise the total mass, the optimsiation runs, however the thickness results of the elements do not seem to interact across the elements that aren't in the same components. This doesnt seem to be consistant with what is shown in the tutorial but it could be okay, im not sure. Any help would be appreciated.
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