TOGGLING COORDINATES IN CONSTRAINT

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

Hi all, i have a problem of constraining my model with respect to a cylindrical co ordinate system.

 

FULL EXPLANATION OF PROBLEM: 

i have meshed a 3d model and have assigned force to the component and on the constraint part i have to assign constraints based on a cylindrical co ordinate system to the nodes on the surface to be constrained so for this i have populated the surface nodes to be constrained in a ENTITY SET  and in the Analysis----->System------->CREATE  i have created a Cylindrical co ordinate system and in Analysis----->System-------> ASSIGN  i have assigned the ENTITY SET to the created cylindrical coordinate system and now my objective is to allow the ROTATION FREE AND CONSTRAIN the other two DOF.

 

BUT  when i go to the constraints i cant find a toggle option to toggle between the global coordinate system to cylindrical coordinate system i can find only dof1 to dof6  and i tried to simulate the cylindrical coordinate system in Rectangular coordinate system  by removing the rotation dof i.e dof4,5&6 the result was not changed bcoz of the reason for a solid 3d component it is enough to constraint only 3 dof's and for this to allow the rotation in  one direction i have made the translation free in the other two direction

 

eg(X,Y,Z) to make rotation about X free i have made the translation free in Y and Z and this resulted in excessive displacement and so the only solution for my problem can be assigning a Cylindrical Coordinate system and locking translation movement and allowing rotational movement alone but am not able to find the place where i can toggle my co ordinate system from Global co ordinate to Cylindrical co ordinate.

 

 

Regards

Jeeva.B

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Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited September 2015

    Hi,

     

    You can create a local coordinate system by going to 1D>>Systems panel. Here you can create a local coordinate system (Rectangular/Cylindrical/Spherical) and assign the same to the

    set of nodes you want to apply  the constraints.Hope this helps.See attached thumbnail for reference.

      

    Regards

    Rahul R

    <?xml version="1.0" encoding="UTF-8"?>post-36845-0-22405400-1441709315_thumb.j

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited September 2015

    thanks rahul for your fast reply.....

     

    i have assigned the node set i.e ENTITY SET (containing the set of nodes to be constrained) to the local cylindrical coordinate system but my objective was to constrain with respect to that cylindrical coordinate system but even after assigning when i go to the analysis------->constraint am only finding the same 6 dof which i found earlier and here am not able to toggle between the global coordinate and the local cylindrical created by me and constraining through the 6 dof will constrain with respect to the global and not according to the newly created coordinate but my aim is to constrain through the newly created cylindrical coordinate by allowing only the rotation free and lock the other two translations.

     

    if u r some one else can say me how to toggle between coordinate systems and constraining with respect to a particular coordinate system them i think my problem will be solved

     

    and about the 1d---->systems i have build the menu i have kept systems  in the analysis tab instead of the 1d so i have followed the same thing as what u have said.

     

     

    Regards

    Jeeva.B

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