×
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

Defining springs using connection section

Defining springs using connection section

Defining springs using connection section

(OP)
I would like to connect two points with spring-like elements, one spring parallel and one spring perpendicular. (note: the springs have the same coördinates)

Model 1:
The first thing i did was using Spring2 elements: First i defined a CSYS at an angle of 45 degrees, because this is perpendicular to the force. I coupled point a to point b first en used spring orientation 1 (parallel), than i coupled point a to point b for the second time and used spring orientation 2 (perpendicular). So far so good and the results looks great.

Model 2:
But now i would like to use non-linear springs and therefore i need to use connectors. Again i drew a wire feature between point a and b, created a section by using the section manager and selected translational type: axial. After that i used the connection section assignment manager to pick the wire feature between point a and b, as orientation i used the global CSYS (modified with 45 degrees) (parallel to force). After this i did the same things again for the perpendicular spring but now i used a modified CSYS with -45 degrees. For one or another reason, this doesn't work. : (zero pivot warnings)

Model 3:
After this i tried to model it in an another way. I defined a wire feature between point a and b, and now i selected the cartesian connecter type. But this also doesn't work. (negative eigenvalues and zero pivot warnings)

Who can help me with this problem?

RE: Defining springs using connection section

hey! have you solved the problem?
I have the same problem...connectors from a point to ground work.
I cannot understand why any connector between 2 points of 2 different part don't work..
any suggestion?
stefano

RE: Defining springs using connection section

(OP)
Dear Stefano,

The problem is probably because of the connection is underconstrained, it helps when you define an extra BC in the third direction

 

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