CMDOMEGA, CM_NAME, DOMEGAX, DOMEGAY, DOMEGAZ, X1, Y1, Z1, X2, Y2, Z2
Specifies the rotational acceleration of an element component
about a user-defined rotational axis.
CM_NAME, The name of the element component.
DOMEGAX, DOMEGAY, DOMEGAZIf the X2, Y2, Z2 fields are not defined, DOMEGAX, DOMEGAY, and DOMEGAZ specify the components of the rotational acceleration
vector in the global Cartesian X, Y, Z directions.
If
the X2, Y2, Z2 fields are defined, only DOMEGAX is required. DOMEGAX specifies the scalar
rotational acceleration about the rotational axis. The rotational
direction of DOMEGAXis designated either
positive or negative, and is determined by the “right hand rule.”
X1, Y1, Z1If the X2, Y2, Z2 fields are defined, X1, Y1, and Z1 define the coordinates of the beginning point of
the rotational axis vector. Otherwise, X1, Y1, and Z1 are the coordinates of a point through which the rotational axis
passes.
X2, Y2, Z2The coordinates of the end point of the rotational axis vector.
Specifies the rotational acceleration components DOMEGAX, DOMEGAY, and DOMEGAZ of an element component CM_NAME about a user-defined rotational axis. The rotational axis can be
defined either as a vector passing through a single point, or a vector
connecting two points.
You can define the rotational acceleration and rotational axis with the CMDOMEGA command for STATIC, HARMIC, TRANS, and SUBSTR analyses. Rotational velocities are combined with the element mass matrices to form a body force load vector term. Units are radians/time2.
The CMDOMEGA command supports tabular boundary conditions
(%TABNAME_X%, %TABNAME_Y%, and
%TABNAME_Z%) for DOMEGAX, DOMEGAY, and
DOMEGAZ input values (*DIM) for full
transient and harmonic analyses. In this case, if the end point is
specified (X2, Y2,
Z2), the rotational velocity axis must be along the global X-, Y-,
or Z-axis.
Related commands are ACEL, CGLOC, CGLOC, OMEGA, CMOMEGA, DCGOMG, DOMEGA.
See Analysis Tools in the Mechanical APDL Theory Reference for more information.
You can use the CMDOMEGA command in conjunction with any one of the following two groups of commands, but not with both groups simultaneously:
| GROUP ONE: OMEGA, DOMEGA. |
| GROUP TWO: CGOMGA, DCGOMG, CGLOC. |
Components for which you want to specify rotational loading must consist of elements only. The elements you use cannot be part of more than one component, and elements that share nodes cannot exist in different element components. You cannot apply the loading to an assembly of element components.
In a modal harmonic or transient analysis, you must apply the load in the modal portion of the analysis. Mechanical APDL calculates a load vector and writes it to the mode shape file, which you can apply via the LVSCALE command.
See Acceleration Effect in the Mechanical APDL Theory Reference for more information.
This command is also valid in PREP7.