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Found 2 results

  1. Hi! I have performed free size optimization and it ran successfully. However I have some questions relating to some of the upper and lower limits and design variables required to enter. After checking the optimization book provided by altair I still do not completely understand in design variable in the parameter option the mindim is what exactly and how to choose it appropriately? As I have chosen different values and it shows different results. Moreover, I chose Volfrac as the optimization constraint and chose upper limit as 0.2 but I am not sure what this represents? As in volume option upper limit showed the volume in mm^3 but volfrac I am not sure what it represents. Another main question I have is that when setting load collectors I can add as many but in Loadstep for load and constraint theres only two options. How can I add two loads and one constraint for my analysis? Please let me know I know this is a long one but your help would be much appreciated. I am attaching my file over here and if you could please take a look to see if my results are appropriate or not? Freesize opt try 1.hm
  2. Dear Community, I have a problem when creating an Optistruct model for freesize optimization including a ply drop-off (PLYDRP) constraint. In particular, I created such a model in Hypermesh 2017 with different design variables (DSIZE). If I export the model in Optistruct format (.fem) and I import it again in Hypermesh 2017, I am not anymore able to see all the DSIZEs but I can see only one of it. I have created a simple model to give you an example. In the file attached, you will find (among the others) four DSIZEs: top, bottom, left, and right. The PLYDRP constraint is activate for all of these design variables. If I export the model to an Optistruct input file (.fem) and I import it again in Hypermesh, I cannot see anymore the four DSIZEs, but only one of them (top) is still there. This happens only if PLYDRP is activated. I would really appreciate if anybody could give me an explanation about this strange behaviour and what to do to avoid it. Thank you in advance, Alessandro plydrop_issue.hm
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