Training:

Relevant data for this tutorial:

Step 1: Reimport your already optimised geometry

The optimised geometry can be reimported into a new project or into the already existing optimisation project. For this Tutorial the project of the Jet Engine Bracket is used.

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After importing the Smooth-Geometry STL-file the optimisation result is displayed as a Faceted Solid inside the model tree.

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Step 2: Mesh to CAD

With the Facet to NURBS Tool in the Geometry Edit Tools the STL-file can be transitioned to a NURBS-Geometry. Therefore, the Automatic Size Calculation and the Partition Preview can stay active. With the The NURBS Face Density how many patches should be influences the number of patches merged together to one bigger patch. A low density value means that fewer, bigger patches and a high density means that more, smaller patches are created.

With the middle mouse button (MMB) the operation can be is executed.

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In a first step a preview of the partitioned quad mesh is shown.

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If the partition looks satisfying the NURBS patch creation can be started. If a higher precision is desired the NURBS Face size can be varied manually. To change the size of the patches the NURBS Face Density can be modified.

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When the transition is finished, the status bar in the bottom left displays “NURBS is created based on partitioned Facet Body” and a new solid shows up in the model tree.

From time to time and depending on the geometry some NURBS patches might fail. These will be displayed in the status bar as well. If this happens the geometry can be repaired manually. How this works is described here.

Step 3: Geometry Cleanup

We recommend to use the Geometry Cleanup Tools after the NURBS CAD-Geometry is created. The Tool Find and Display Geometry Faults Method on the right side can find possible geometry faults can be displayed. With the Tool Geometry Clean and Optimise Method on the left side a an automatic repair can be performed.

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Step 4: Creation of functional surfaces and sharp edges with Boolean Operations

To create the final NURBS-Geometry all functional surfaces and sharp edges have to be created with Boolean Operations. The best way for this is a Boolean Intersection between the retransitioned optimisation result and the Design Space of the optimisation. A copy of the Design Space is needed for the following operation.

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To create one solid without any cells or partitions the Boolean Merge function for cells has to be is used. With this a Solid only for the Intersection with the NURBS Retransition is created.

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The result is an intersected CAD-Geometry with all functional sharp edges and surfaces. At this point it is also possible to create Machining Allowances on functional surfaces if a geometry was not already created directly by during the optimisation.

The finished Geometry can be used in any CAD software and for all further steps like a FE-Reanalysis with MSC Nastran.

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