ansys 指令RIGID

ansys 指令RIGID RIGID, Dof1, Dof2, Dof3, Dof4, Dof5, Dof6 — Specifies known rigid body modes (if any) of the model. SOLUTION:Dynamic Options MP ME ST PR PP ED Dof1, Dof2, Dof3, Dof4, Dof5, Dof6 Up to six global Cartesian directions of the rigid modes. For a completely free 2-D model, use ALL or UX, UY, ROTZ. For a completely free 3-D 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). Use NONE to force the subspace iteration calculation of all rigid body modes. If the structure has no constraints, the label ALL is assumed (unless substructures are present). Command Default Any rigid body modes are calculated via subspace iteration. Notes Specifies known rigid body modes (if any) of the model. Applies only to modal analyses with subspace iteration [MODOPT,SUBSP]. Rigid body modes specified to the program with this command are not calculated via subspace iteration, resulting in a faster solution. Any rigid body modes specified must be permitted by the applied displacement constraints (i.e., 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. Menu Paths See RIGID Menu Paths in the ANSYS Command Menu Path Listings. Prev Up Next Home /RGB RIMPORT