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This tutorial shows how to perform a Restart of a stopped optimisation. Therefore, the Advanced User Settings are needed. More information regarding the background of a Restart here.
With this option a terminated optimisation can be continued. To realize a Restartanother geometry can be chosen as the Start Space instead of the Design Space. In this case the optimisation starts with the specified geometry although the whole Design Space is still the geometry limitation for the optimisation.
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The Start Space for a Restart must be a STL-file. Therefore, an already optimised geometry can be used and with the exported in the Post Processing. In this case iteration 22 from the Bookshelf Tutorial will be used.
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Optimisation Setup
In the next step a new Scenario should be created for the Restart optimisation. Therefore, the already existing Scenario can be cloned.
With the Advanced User Settings - available through a right click on theScenario- the Start Space STL-file can be selected. In this case the exported iteration 22 is selected.
The most important part of a Restart is to add and adjust the Advanced User Settings especially the number of iterations, the resolution level and the safety factor coefficient. More background information regarding the Advanced User Settings here.
In this example the Bookshelf should be restarted as if the optimisation never stopped, so with the same optimisation parameters as the first optimisation but excluding the already done iterations. Therefore, the settings for the parameters Strut Density: Medium and Shape Quality: Balanced are added to the Advanced User Settings and adjusted according to the number of iterations already calculated. Which number of iterations and which Event Safety Factor should be input for each resolution level can be found here.
42 iterations must be added to reach the total number of 64 iterations (Shape Quality: Balanced).
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The information are added in the Advanced User Settingsin the following style:
schedule.level.0.iterationCount = 0
schedule.level.1.iterationCount = 17
schedule.level.2.iterationCount = 20
schedule.level.3.iterationCount = 5
schedule.level.0.eventSafetyCoefficient = 0.3
schedule.level.1.eventSafetyCoefficient = 0.4
schedule.level.2.eventSafetyCoefficient = 0.9
schedule.level.3.eventSafetyCoefficient = 1
schedule.startCandidate.candidate= <restart-file.stl>
geometry.startCandidate.path= <restart-file.stl>
After adding these commands to the Advanced User Settings the optimisation can be started. The first iteration of the restarted optimisation will be the imported Start Space.
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You can check the status of the optimisation in the GD Status and get more information on Warning and Error messages. This can be done directly in the Post-Processing as well as in the Studies tab for an optimisation that has already run.
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The whole MSC Apex Generative Design project with all results can be downloaded here:
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