Issue with self-weight during optimization process
Altair EmployeeHello,
I need to optimize a structure submitted to its self-weight and another hundred kg force. The self-weight (GRAV) does not allowed the convergence in DUAL mode (I do not have any access to DUAL2). I'm using the student Hyperworks 2017 edition. I tried to modifie the solver (MUMPS...) but there is no difference.
Thank you in advance for you help.
Baptiste
Answers
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Hi,
Can you share the entire .out file?
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I do not have my pc with the licence so I can't check if it is the good file. But I think it is.
These are two models in 2D and 3D of a street light floor lamp.
Thank you very much.
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Hi,
I see feasible design (solution converged) in both out files.
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Yes I know but the solution is not clean with a lot of checkerboard in the material and isolated areas. Is there anything to do to avoid self-weight issues ?
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It looks like this while there is a force applied at the right edge...
<?xml version="1.0" encoding="UTF-8"?>
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Hi,
Do you have any member size controls (minimum membersize/maximum membersize)?
If you have member size constraint, try to add CHECKER card on DOPTPRM
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Hello,
I don't have any member size control. I tried to add one in DESVAR and modify some parameters in DOPTPRM, including CHECKER=1 but there isn't any improvement. Moreover, the result doesn't respect the maximum volume constraint. (I wonder if Optistruct is able to take the self-weight into account for topology optimization). Do I have to put a non-design area on the right edge to get density where the force is applied ? Here is the file I'm using to modelize the problem.
Thank you very much for your advice.
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