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!

*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

FEA Dynamic Analysis

FEA Dynamic Analysis

FEA Dynamic Analysis

Hi, I'm working on a project that entails calculating the frequency response on a steel structure made with 2D elements.

Does anybody knows a rule of thumb to define the minimum size of elements in order to be able to obtain reasonable results for a certain frequency?

Say for example that I would like to calculate the frequency response on a 10 mm thick plate at 300 Hz.

Thank you!

RE: FEA Dynamic Analysis

There’s no general rule like that, it all depends on specific case. But you can perform sort of mesh study - run several analyses, each with finer mesh and compare the results to check % difference in results.

RE: FEA Dynamic Analysis

Ok, Thanks.That's what I'm doing, but I wanted to have a rough number on what is the minimum number of elements you need in order to represent a certain frequency due to the wavelenght in, for example, steel.

RE: FEA Dynamic Analysis

In case of acoustics you need at least 6 second-order elements per wavelength so you can calculate maximum element size from this formula:

h_max = λ/6 = c/6f

But I haven’t heard about such requirement/recommendation for structural dynamics.

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! Already a Member? Login


eBook - Functional Prototyping Using Metal 3D Printing
Functional prototypes are a key step in product development – they give engineers a chance to test new ideas and designs while also revealing how the product will stand up to real-world use. And when it comes to functional prototypes, 3D printing is rewriting the rules of what’s possible. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close