hexagon logo
Register Sign in
  • State Not Answered
  • Replies 8 replies
  • Subscribers 11 subscribers
  • Views 94 views
  • Users 0 members are here
Options
Related

BCs for flexbodies

Josef K.
Hello,
 
Is there a way to include SPCs in your model when creating and MNF file for a flexbody? I am asking because when I tried creating an mnf file for a table-like structure, the 1st mode was completely off than when running a simple sol103. The points which were supposed to be constrained were moving freely in the modes (even though I had also included them in ASETS).
 
Is there another way that I can ensure the validity of the constraints when creating an mnf file?
 
Thanks,
 
Josef
Parents
  • 0
    Have a body (with constraints) in Adams View
    Launch ViewFlex from the Ribbon (Bodies tab, Flexible Bodies container, ViewFlex button)
    Check Advanced Settings
    Select Attachments (Mesh will be generated)
    Select Find Attachments
    (Attachment Method for each Row can be chosen from RBE2 or RBE3)
    In the column Rel.DOF you now can define the dofs. But as I see now, you have to define the dofs, which later will definitely not be constrained and therefore will not have to be taken into consideration when building the constraint-modes (the default 0 indicates that there will be 6 constraint-modes)
     
    The F1-help says for Rel.DOF:
    Degrees of freedom (DOF) to be released in the modal analysis. Any released DOF do not allow constraints with other bodies. The required input is a series of integers, from 1 to 6, indicating that the corresponding DOF must be released:
    ■0 = No DOF released
    ■1 = X-axis translation
    ■2 = Y-axis translation
    ■3 = Z-axis translation
    ■4 = X-axis rotation
    ■5 = Y-axis rotation
    ■6 = Z-axis rotation
    For example, if you want to release x translation, z translation, and y rotation, enter 135. To release all rotational DOF, enter 456.
     
    So I have to admit that the wording is a bit opposite to what I said before. You cant "lock" the dofs in Adams/ViewFlex. Instead you have to release the dofs which definitely are of no interest for you. Perhaps you have to try a little bit to get a better understanding.
     
    Bruno
Reply
  • 0
    Have a body (with constraints) in Adams View
    Launch ViewFlex from the Ribbon (Bodies tab, Flexible Bodies container, ViewFlex button)
    Check Advanced Settings
    Select Attachments (Mesh will be generated)
    Select Find Attachments
    (Attachment Method for each Row can be chosen from RBE2 or RBE3)
    In the column Rel.DOF you now can define the dofs. But as I see now, you have to define the dofs, which later will definitely not be constrained and therefore will not have to be taken into consideration when building the constraint-modes (the default 0 indicates that there will be 6 constraint-modes)
     
    The F1-help says for Rel.DOF:
    Degrees of freedom (DOF) to be released in the modal analysis. Any released DOF do not allow constraints with other bodies. The required input is a series of integers, from 1 to 6, indicating that the corresponding DOF must be released:
    ■0 = No DOF released
    ■1 = X-axis translation
    ■2 = Y-axis translation
    ■3 = Z-axis translation
    ■4 = X-axis rotation
    ■5 = Y-axis rotation
    ■6 = Z-axis rotation
    For example, if you want to release x translation, z translation, and y rotation, enter 135. To release all rotational DOF, enter 456.
     
    So I have to admit that the wording is a bit opposite to what I said before. You cant "lock" the dofs in Adams/ViewFlex. Instead you have to release the dofs which definitely are of no interest for you. Perhaps you have to try a little bit to get a better understanding.
     
    Bruno
Children
No Data
© 2025 Hexagon AB and/or its subsidiaries. Privacy Policy | Cloud Services Agreement