Discussion Groups

Distinguished Contributor
Posts: 181
Registered: ‎02-24-2009

# Moment of inertia?

5939 Views, 4 Replies
07-30-2010 06:31 AM

Hi,

I would like to find a way in AutoCAD to calculate the (momet of inertia). In the (help) of AutoCAD exists (moment of inertia) but when I opened it, I foud nothing about (moment of inertia) but only about calculation of the area.

Is there anybody can help me to find a way to do that? Specially, that can be useful in the irregular shapes.

Thanks

Valued Mentor
Posts: 1,257
Registered: ‎08-17-2007

# Re: Moment of inertia?

07-30-2010 08:04 AM in reply to: jz4all
MASSPROP on REGIONs and SOLIDs
Contributor
Posts: 16
Registered: ‎03-25-2009

# Re: Moment of inertia?

08-01-2010 02:03 AM in reply to: jz4all

Hi,

once you have created your shape from lines and arcs you will need to create a region from the shape by using the "region" command and selecting all the lines and or arcs after I usually move the bottom left corner of the shape to 0,0. Once you have done this, run the "massprop" command and click the region you created, you will then have a text box that pops up showing the moment of inertia results.

See attached image example.

Hope this helps

www.norburydesign.com
Distinguished Contributor
Posts: 181
Registered: ‎02-24-2009

# Re: Moment of inertia?

08-02-2010 12:07 AM in reply to: jz4all

Thankyou for help.It works fantastic.

New Member
Posts: 1
Registered: ‎02-15-2013

# Re: Moment of inertia?

02-15-2013 10:04 PM in reply to: jz4all

What is I & J in below result

rea:                    1437.9615
Perimeter:               491.3206
Bounding box:         X: -96.7383  --  -31.7383
Y: 438.3598  --  583.3598
Centroid:             X: -62.7098
Y: 517.4386
Moments of inertia:   X: 387984772.1991
Y: 5941776.0140
Product of inertia:  XY: -46145896.8066