×
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

Random vibration with contact problem

Random vibration with contact problem

Random vibration with contact problem

(OP)
Hi guys,

I am quite new with random vibration, I have been reading some material but everything is kind of a mess in my head. It would be great if you can help me with some questions or recommend me a relevant book, thank you.

If I have a plate subjected to a random excitation PSD (eg 0.1 g^2/Hz), what does it really mean? Should I treat it like a forced vibration problem or a base excitation problem?

If the plate has one support leg at each corner, they are not bonded but in contact due to a pretension force at the center of plate, is there any way that I can tell if they will stay in contact? I am thinking if the RMS displacement value calculated from response PSD is less than the displacement introduced by pretension force, they will stay in contact within 68% of time. Is that true?

Thank you in advance.

RE: Random vibration with contact problem

(OP)
Hi Greg,

There is one leg at each corner of the plate so four in total. The pretension force is applied at the center of plate.

RE: Random vibration with contact problem

(OP)
Hi Greg,

Thank you for your reply. I would like to assume the boundary condition is simply supported along four edges of the plate (since I don't think I can solve more realistic one like four point supported and free edge elsewhere).

But I am not quite sure what do you mean regarding the stiffness of the floor? I would say it is a rigid body and we don't need to include a spring or so in the model to represent the floor. Would this make the problem more simple?

RE: Random vibration with contact problem

(OP)
Hi Greg,

I understand, thank you so much for your reply!

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


Resources


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