×
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

Modal dynamics, base motion issue

Modal dynamics, base motion issue

Modal dynamics, base motion issue

(OP)
Hi guys, first of all thanks for spending time reading this.

I have a model of a Bus and I'm trying to do a modal dynamic analysis (the simulation finish with no problem), however I'm getting huge displacements.
I'll explain my problem:

I have a bus with a gravity applied all over the model and I'm trying to simulate a bump through secondary base motion, type=displacement.

The thing is, If I encastre the rear wheels and apply the secondary base motion(type=displacement/acceleration) to the front wheels they move as much as I want and I dont have any problem.

However in reality the rear wheels are able to move and rotate freely except in Z-direction.

When I try this second case(or enable rotation around the wheel axle), base motion displacement in z-direction with a given amplitude(the same as before), I get huge displacements and accelerations. I cant understand why this is happening.
If anyone could point me to the right direction I would be grateful


I tried this way, but if anyone has an alternative to simulate a bump I would appreciate the suggestion.

Thanks in advance.

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