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Define Hub and Shroud for imported CAD file

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Old   May 10, 2016, 06:38
Default Define Hub and Shroud for imported CAD file
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Hi NUMECA users,

i have a question concerning the definition of my Hub and Shroud curves. I prepared a CAD-file of an impeller and imported it to AutoGrid 5. But now i dont have exact Hub and Shroud curves to select. Can i somehow manage to define them with surfaces or do i have to make them visible in the CAD-Model?
Thanks for your answers.

Regards Daniel.
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Old   May 10, 2016, 06:51
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Here you can see a picture of the imported file.
Attached Images
File Type: png NUMECA.PNG (61.8 KB, 46 views)
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Old   May 10, 2016, 17:13
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You need to have hub and shroud curves the revolving of which makes hub and shroud surfaces respectively. regarding the blades it seems no problem.

regards
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Old   May 11, 2016, 04:34
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Did you mean i just have to select all curves the build the surface, for example for Shroud, and than link them all to Shroud?
Or do i need an extra curve?

Anyway thanks for the answer, i´m working on it.
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Old   May 11, 2016, 06:38
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It is simple. Let me explain it this way:
every revolved surface is constructed by revolving a curve. for example in a z r theta reference frame, if there is a revolved surface around z, there is a curve defined using z and r. you should find this curve.
one method is to intersect the revolved surface with a proper plane, e.g. ZR plane. do this for both hub and shroud surfaces.
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Old   May 11, 2016, 06:52
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Thanks a lot for you answer Hamizoka,
i got what you meant, but i have one last question:
Do you know if i can produce such a plan in CAD or should i do it in NUMECA?
Regards.
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Old   May 11, 2016, 07:05
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This should be done in a 3D CAD modeler e.g. Catia, NX,...

regards
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Old   May 18, 2016, 09:03
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Indeed it can be done in CAD or in NUMECA software, (IGG/AutoGrid5) whichever you prefer.
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