×
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

Extracting Nodal Mass

Extracting Nodal Mass

Extracting Nodal Mass

(OP)
Good afternoon,

I am a new Abaqus user, and had some questions regarding nodal mass. I am using Abaqus to design a plate (planar shell elements w/ thickness) and extract mode shape data. Ideally, I would like to import all necessary data into Matlab to conduct some simulations. Of the data I need, I have been able to extract geometric data from the .inp file and the mode shape data from a generated report (.rpt file).

I'd also like to extract the nodal mass. Ideally, I am looking for a table including the node number and the nodal mass. I understand this information may be available in the .odb file, but I have not been able to import any data from the .odb into Matlab. Does anyone know how to retrieve this data? Any suggestions are tremendously useful.

Thanks for your help,

Mark

RE: Extracting Nodal Mass

(OP)
For anyone interested, I have found a plausible solution to approximating nodal mass.

First, construct and mesh the part. Create a "Static-General" step. For boundary conditions, fix all nodes (Encastre- both rotation and translation). For load conditions, create a gravity field with magnitude 1 for SI units(for my case, I have constructed a planar geometry in the X-Y plane, so my gravity field is in the Z-direction, normal to the geometry). Then under field output requests, select nodal reaction forces. You may then create and submit a job. Once the job has been completed, you are able to generate a field report with the reaction forces by node number. These reaction forces will correspond to nodal mass, which may be useful in analytic vibration analysis.

Hope that helps anyone with a similar problem.

-Mark

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