Free-size optimization un/feasible
Altair EmployeeHello,
I tried to variate the input parameters of my current free-size optimization project. I used starting thickness values of the properties which have proven to be successful before, this is delivering a feasible result with a mass of 400 kg. The optimization goal is to minimize the mass with a constrained buckling factor above 1 and a stress parameter.
Let's say my input thicknesses are not the ideal solution. For this purpose, I tried very large thickness parameters as input, so that the solver can vary them. Instead of 20 mm, I used 100 mm for instance. This is then leading to an unfeasible result, which is (not much but still) violating the buckling constraints. A mass of 200 kg can be achieved.
Can anyone please help me to understand what went south here? I gave the solver more material and more freedom to variate the design variables (=elements), but it couldn't deliver a feasible result. The problem was less constrained than the initial problem. So I expected a better result.
Thank you!
Answers
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Any ideas how I can solve this problem?
Here is the out-file, if it helps:
It looks like the free-size optimization does not 'see' the buckling constrain at all, the results are getting worse after iterations
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Hi Galerkin,
From the out file buckling responses looks to be considered and some how the response is violated due to the range.
Can you try changing the response value and check again?
<?xml version="1.0" encoding="UTF-8"?>
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