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Add Mass on a rotating System

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Old   May 2, 2012, 05:44
Default Add Mass on a rotating System
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Hi,
i d like to simulate a rotating Disk of a Turbine Stage.
Since i just want to model the Disk itself w/o the Blades, i d like to add a mass instead with the same area moment of inertia and center of gravity as the blades.
I added a small picture to illustrate the problem. I d like to add it on the "Top" Named Selection.
Anyone knows if it is possible and how i could do this?
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