rigid

DynamicOptions.rigid(dof1='', dof2='', dof3='', dof4='', dof5='', dof6='', **kwargs)

Specifies known rigid body modes (if any) of the model.

Mechanical APDL Command: RIGID

Parameters:

dof1str

Up to six global Cartesian directions of the rigid modes. For a completely free 2D model, use ALL or UX, UY, ROTZ. For a completely free 3D model, use ALL or UX, UY, UZ, ROTX, ROTY, ROTZ. For a constrained model, use UX, UY, UZ, ROTX, ROTY, or ROTZ, as appropriate, to specify each and every unconstrained direction which exists in the model (not specifying every direction may cause difficulties in extracting the modes).

dof2str

Up to six global Cartesian directions of the rigid modes. For a completely free 2D model, use ALL or UX, UY, ROTZ. For a completely free 3D model, use ALL or UX, UY, UZ, ROTX, ROTY, ROTZ. For a constrained model, use UX, UY, UZ, ROTX, ROTY, or ROTZ, as appropriate, to specify each and every unconstrained direction which exists in the model (not specifying every direction may cause difficulties in extracting the modes).

dof3str

Up to six global Cartesian directions of the rigid modes. For a completely free 2D model, use ALL or UX, UY, ROTZ. For a completely free 3D model, use ALL or UX, UY, UZ, ROTX, ROTY, ROTZ. For a constrained model, use UX, UY, UZ, ROTX, ROTY, or ROTZ, as appropriate, to specify each and every unconstrained direction which exists in the model (not specifying every direction may cause difficulties in extracting the modes).

dof4str

Up to six global Cartesian directions of the rigid modes. For a completely free 2D model, use ALL or UX, UY, ROTZ. For a completely free 3D model, use ALL or UX, UY, UZ, ROTX, ROTY, ROTZ. For a constrained model, use UX, UY, UZ, ROTX, ROTY, or ROTZ, as appropriate, to specify each and every unconstrained direction which exists in the model (not specifying every direction may cause difficulties in extracting the modes).

dof5str

Up to six global Cartesian directions of the rigid modes. For a completely free 2D model, use ALL or UX, UY, ROTZ. For a completely free 3D model, use ALL or UX, UY, UZ, ROTX, ROTY, ROTZ. For a constrained model, use UX, UY, UZ, ROTX, ROTY, or ROTZ, as appropriate, to specify each and every unconstrained direction which exists in the model (not specifying every direction may cause difficulties in extracting the modes).

dof6str

Up to six global Cartesian directions of the rigid modes. For a completely free 2D model, use ALL or UX, UY, ROTZ. For a completely free 3D model, use ALL or UX, UY, UZ, ROTX, ROTY, ROTZ. For a constrained model, use UX, UY, UZ, ROTX, ROTY, or ROTZ, as appropriate, to specify each and every unconstrained direction which exists in the model (not specifying every direction may cause difficulties in extracting the modes).

Notes

Specifies known rigid body modes (if any) of the model. This command applies only to a component mode synthesis (CMS) analysis (see the cmsopt command). Any rigid body modes specified must be permitted by the applied displacement constraints (that is, do not specify a rigid body mode in a constrained direction). Reissue the command to redefine the specification. If used in SOLUTION, this command is valid only within the first load step.

This command is also valid in PREP7. Distributed-Memory Parallel (DMP) Restriction This command is not supported in a DMP solution.