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Mass moment of inertia of an irregular area

by garytse86
Tags: inertia, irregular, mass, moment
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Mar20-08, 03:29 PM
P: 308
Hi. Please help. I'm struggling to find the mass moment of inertia of an area.

Please see picture.

I already have the centroid of the area, and the exact area.

How would I find the mass moment of inertia of this area about its centroid?

I tried using AutoCAD, but it gives you the *area* moment of inertia which isn't helpful to me?

do you guys know any programs that find the mass moment of inertia of an irregular area for you?

Thanks A LOT.
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Mar20-08, 09:44 PM
P: 3
Alibre can do that. I think Solidworks or Pro-E can too, but not sure.
Mar21-08, 08:37 PM
Sci Advisor
FredGarvin's Avatar
P: 5,095
Pro-E and Solidworks will definitely do it. However, you could just start breaking it up into a lot of smaller parts and calculating it yourself. I would think setting a spreadsheet up wouldn't be too difficult, just time consuming.

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