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Instead of the Design space a other volume can be chosen as the StartSpaceStart space. The Design space is still the limit for this optimization. With this option a terminated optimization can be continued or a two-stage optimization with varified optimization parameters can be done.
Restart
The Start space has to be a STL-file. Therefore a already optimized geometry can be exported inside the Post Processing. In this case iteration 22 from the symmetrical Bridge will be used.
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Attention: The STL-file for the Restart has to be exported in SI-Units (Meters).
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For a Restart a new scenario should be created. With the Advanced User Settings the Start space STL-file can be selected. In this case the exported iteration 22 from an former optimization. Furthermore the symmetry constraints from the first optimization are added.
The most important part of a Restart is to adjust the number of iterations, number of resolution level and the stress goal percentage. More information to this here.
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In this example the Bridge should be restarted with the same optimization parameters as the first optimization. This is needed when a optimization is terminated and should be restarted at another time. Therefore the missing number of iterations for the parameters Strut Density: Medium and Shape Quality: Balanced are added with the Advanced User Settings. Which number of iterations and stress percent goal for each resolution level can be looked up here.
In this case the optimization will restart with iteration 22, thus the following 42 iterations have to be added to reach the total number of 64 iterations (Shape Quality: Balanced). Therefore the UpSampleConfig in the picture below is added (18 iterations at resolution level 2, 20 iterations at resoultion level 1 and 4 iterations at resolution level 0).
After adding this comands to the Advanced User Settings the optimization can be started. The first iteration of the restarted optimization will be the imported Start space.
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Two-stage optimization
A two-stage optimization is useful for the following applications:
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