×
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

How to introduce the mass in ansys

How to introduce the mass in ansys

How to introduce the mass in ansys

(OP)
Hi everybody;
Does any one could tell me ho to specify the mass in the modal analysis of a structure by ANsys software. I specified it through Inertia; Gravity commands but i got a very large value of frequency. I think the mass was zero.
Thanks.

RE: How to introduce the mass in ansys

Hello!

If you are working in millimiters you must specify the density in ton/mm^3.

If you are working in meters you must specify the density in kg/m^3.

I had also this problem in the past. Prepare a simple model of a beam and compare it with the analytical results and you will see that they match.

Note that the frequency independs on the gravity so you shouldn´t specify it.

RE: How to introduce the mass in ansys

(OP)
Thanks ASMS81

RE: How to introduce the mass in ansys

"Note that the frequency independs on the gravity so you shouldn´t specify it."

This is not necessarily true; the loading condition could be such that the initial stress state caused by gravity affects the stiffness of the structure. If this is the case, then a pre-stressed modal analysis is needed.

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