SECJOINT, Kywrd, Val1, Val2, Val3, Val4, Val5, Val6
Defines local coordinate systems at joint element nodes and other
data for joint elements.
KywrdKeyword that indicates the type of joint element data being defined.
LSYS or blank | — | Define local coordinate systems at the nodes that form the MPC184 joint element. |
RDOF | — | Define the relative degrees of freedom to be fixed for an MPC184-General joint element. |
PITC | — | Define the pitch of an MPC184-Screw joint element. |
FRIC | — | Define the geometric quantities required for Coulomb frictional behavior in the MPC184-Revolute or MPC184-Translational joint element. |
Val1, Val2, Val3, Val4, Val5, Val6The meaning of Val1 through Val6 changes,
depending on the value of Kywrd.
If Kywrd =
LSYS (or blank), Val1 and Val2 are
Identifiers of the local coordinate systems at nodes I and J, respectively,
of the joint element. Val3 through Val6 are
not used.
If Kywrd = RDOF, Val1 through Val6 are
the relative degrees of freedom to be fixed for a general joint element. Input
1 for UX, 2 for UY, 3 for UZ, 4 for ROTX, 5 for ROTY, and 6 for ROTZ. You
may input the DOFs in any order.
If Kywrd = PITC, Val1 is
the pitch of the screw joint element; pitch is defined as the ratio of relative
axial displacement (length units) to relative rotation (in radians). Val2 through Val6 are
not used.
If Kywrd = FRIC, Val1 through Val3 are defined as follows.
| For Revolute Joint: |
Val1 = outer radius |
Val2 = inner radius |
Val3 = effective length |
| For Translational Joint: |
Val1 = effective length |
Val2 = effective radius |