Shape suggestions for known mass & inertia

[mloew]

Hi all,

I am trying to develop a revolved shape that will have a known mass = 130 kg and known I (about the rotation axis) = 3.6e7 kg*mm^2 and must fit inside the cylinder with D_o <= ~1200 mm, D_i >= ~300 mm and Length < 450 mm.

Shape is completely arbitrary and density can be modified as well. I tried many obvious shapes and can not get the inertia high enough with the variables I have. Any suggestions? I am using Pro/ENGINEER's Behavioral Modeling functionality, but the problem solution is not dependant on this tool.

Thanks in advance.

Best regards,

Matthew Ian Loew
&quot;Luck is the residue of design.&quot;
Branch Rickey

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[mloew]

IRstuff,

The envelope to package my parametric solid is smaller that the actual body that generates the properties. The actual body is also hollow, but that space can be used to “house” the representative solid. Think of a tire and an insert inside the tire representing the properties of the tire.

Best regards,

Matthew Ian Loew
&quot;Luck is the residue of design.&quot;
Branch Rickey

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[IRstuff]

Sorry, I was reading your previous posting too literally.

TTFN

 

[mloew]

IRstuff,

No problem. Thanks for your continued interest!

Best regards,

Matthew Ian Loew
&quot;Luck is the residue of design.&quot;
Branch Rickey

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.