DOF only locked in one direction

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Hello @ all,

 

Is it possible to lock a DOF in only one direction/way?

 

For example:

I want to block a DOF in the 'minus x direction', but it should be able to move in the positiv way.

 

Is it possible and how to do this?

 

 

Thanks for your help.

 

 

Greets,

Thomas

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Answers

  • tinh
    tinh Altair Community Member
    edited December 2014

    Hi

    perhaps you need to do this by CGAP elements

    check reference guide about CGAP

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited December 2014

    Hi Thomas,

     

    here is a workaround using GAP elements (as Tinh suggested)

     

    This can be accomplished using gap elements. Please refer below for the steps. 

    1. Create a duplicate node and translate it along negative X direction (any small distance.) 
    2. Create a gap element such that N1  N2 is directed in negative X direction. (Make sure to place the gap element in separate collector) 
    3. Create a PGAP property and assign it to the CGAP element. 
    4. Card edit the PGAP property and enter say KB = 2E+20 (basically a high value) 

    This will restrict the motion of the node (N1) in negative X direction.

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