×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Assing moment of inertia to an assembly

Assing moment of inertia to an assembly

Assing moment of inertia to an assembly

(OP)
Hi,

I am trying to run a motion analysis study on an assembly. I have assigned mass and centre of gravity but I can't find how can I assign moment of inertia. Any help would be appreciated.

 

RE: Assing moment of inertia to an assembly

SW calculates the I values both from the origin and the center of mass.  If you want to change the I then you can move the assembly within the coordinate system to match where you want it to be.   

Dan

www.eltronresearch.com
Dan's Blog

RE: Assing moment of inertia to an assembly

(OP)
Hi

Thanks for the reply. I want to assign I values from centre of mass. I have modelled a simple representation of the actual assembly for use in motion analysis. Any idea ?

RE: Assing moment of inertia to an assembly

I guess I just don't understand how you would _assign_ the moment of inertia. Isn't that a result of the material density and geometry of the object relative to the axis? If you want to manipulate I you have to vary the geometry.

--
Hardie "Crashj" Johnson
SW 2011 SP 4.0
HP Pavillion Elite HPE
W7 Pro, Nvidia Quaddro FX580

 

RE: Assing moment of inertia to an assembly

He's talking about motion analysis, not just modelling.

It's been a few months, but I recall that the parameters for inertia were on the same interface as those for CG and mass, arranged in a 3x3 grid.

RE: Assing moment of inertia to an assembly

(OP)
Thanks TheTick

I expected the inertia to be on the same interface as CG and mass but (I am using SW2011) when i choose the option of assigned mass properties in mass properties dialog box, only mass and centre of gravity options are there.

RE: Assing moment of inertia to an assembly

Unfortunately, I do not have access to the full SW Motion at my new job.  Can't help further.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources