×
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

local modes in gear

local modes in gear

local modes in gear

(OP)
Hi

I have just given pinion gear for SOL 103 ( Modal analysis ) . I have wondered that I found local modes at the top of the gear. Top few elements having different modes when compared to others. What could be wrong ? Image is attched below

RE: local modes in gear

Looks like you have elements which are overlayed onto others at the top of the pinion.

In your figure these elements are showing a mode of very low frequency (<< 0.5Hz) which I wouldn't expect. With the very few details you've given it's very difficult to offer any advice other than check your mesh.


------------
See FAQ569-1083: Asking questions the smart way on Eng-Tips fora for details on how to make best use of Eng-Tips.com

RE: local modes in gear

(OP)
Let me explain in detail

The pinion is hexameshed and ran 103 in nastran with steel as material property .It is just a free run , no SPCs or MPCs defined. But when I checked the results , few elements as you can see in the image behave in different manner and having different modes.

wht might be the reason?

I am sure that there are no coincident elements and all nodes are connected


thank you 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